WO2024202168A1 - Refrigeration system - Google Patents

Abstract

This refrigeration system comprises: a plurality of first refrigeration devices that each include a first refrigeration circuit for circulating a first heat medium, a first condenser capable of transferring thermal energy of the first heat medium to a second heat medium, and a first evaporator capable of transferring cold energy of the first heat medium to a third heat medium; a first exhaust heat recovery line through which the second heat medium flows and which is connected to the first condenser of each of the plurality of first refrigeration devices; a first cold recovery circuit through which the third heat medium circulates and which is connected to the first evaporator of each of the plurality of first refrigeration devices; another refrigeration device that is different from the plurality of first refrigeration devices; and a second exhaust heat recovery line through which a heat medium for recovering thermal energy from the other refrigeration device flows and which is connected to at least one of the first cold recovery circuit and the first exhaust heat recovery line.

Description

Refrigeration System

The present disclosure relates to refrigeration systems.
This application claims priority based on Japanese Patent Application No. 2023-56839, filed with the Japan Patent Office on May 31, 2023, the contents of which are incorporated herein by reference.

Patent Document 1 discloses a refrigeration system that uses ammonia as a primary refrigerant and _CO2 brine as a secondary refrigerant to air-condition each room of a building and to refrigerate a freezer or the like.

Patent No. 5896525

The refrigeration device described in Patent Document 1 is provided with a dedicated brine supply device and ammonia refrigeration device for each cooling object, so if a malfunction occurs in these devices, there is a risk that the malfunctioning device will not be able to cool the cooling object it is responsible for. For this reason, due to its structure, it may be difficult to ensure the stability of the refrigeration device described in Patent Document 1.

In view of the above circumstances, at least one embodiment of the present disclosure aims to provide a refrigeration system that can easily ensure the stability of the refrigeration system.

In accordance with at least one embodiment of the present disclosure, a refrigeration system includes:
a first refrigeration circuit for circulating a first heat medium;
a first condenser provided in the first refrigeration circuit and configured to be capable of transferring thermal energy of the first heat medium to a second heat medium; and a first evaporator provided in the first refrigeration circuit and configured to be capable of transferring cold energy of the first heat medium to a third heat medium;
a first exhaust heat recovery line through which the second heat medium flows, the first exhaust heat recovery line being connected to the first condenser of each of the plurality of first refrigeration devices so as to be capable of flowing the second heat medium;
a first refrigeration recovery circuit for circulating the third heat medium, the first refrigeration recovery circuit being connected to the first evaporator of each of the plurality of first refrigeration devices so as to be capable of flowing the third heat medium;
Another refrigeration device different from the plurality of first refrigeration devices;
The system further includes a second exhaust heat recovery line through which a heat medium flows to recover thermal energy from the other refrigeration device, the second exhaust heat recovery line being connected to at least one of the first cold heat recovery circuit or the first exhaust heat recovery line so that the heat medium can flow therethrough.

At least one embodiment of the present disclosure provides a refrigeration system that can easily ensure the stability of the refrigeration system.

FIG. 1 is a diagram illustrating a schematic circuit of a refrigeration system according to an embodiment of the present disclosure. FIG. 1 is a diagram illustrating a schematic circuit of a refrigeration system according to an embodiment of the present disclosure. FIG. 1 is a diagram illustrating a schematic circuit of a refrigeration system according to an embodiment of the present disclosure. FIG. 4 is a diagram illustrating an example of a circuit of the first refrigeration device illustrated in FIGS. 1 to 3. FIG. 2 is a diagram illustrating an example of a circuit of the second refrigeration unit illustrated in FIG. 1 . FIG. 4 is a diagram illustrating an example of a circuit of the second refrigeration device illustrated in FIGS. 2 and 3. FIG. 1 is a schematic perspective view of a refrigeration system according to an embodiment of the present disclosure. FIG. 2 is a schematic perspective view of a refrigeration system according to a comparative example. 1 is a schematic perspective view of a refrigeration system in an intermediate state when converting a refrigeration system according to a comparative example to a refrigeration system according to an embodiment of the present disclosure. FIG.

Below, several embodiments of the present disclosure will be described with reference to the attached drawings. However, the dimensions, materials, shapes, relative positions, etc. of the components described as the embodiments or shown in the drawings are not intended to limit the scope of the present disclosure and are merely illustrative examples.

In the following explanation, when simply referring to the upstream side, it refers to the upstream side along the main flow direction of the fluid in the part or area to which the directional description applies. Similarly, in the following explanation, when simply referring to the downstream side, it refers to the downstream side along the main flow direction of the fluid in the part or area to which the directional description applies.

(Refrigeration System)
Each of Figures 1 to 3 is a diagram that typically illustrates a circuit of a refrigeration system 1 according to an embodiment of the present disclosure. Figure 4 is a diagram that typically illustrates an example of a circuit of a first refrigeration device 20 illustrated in Figures 1 to 3. As illustrated in Figures 1 to 3, the refrigeration system 1 includes a plurality of first refrigeration devices 20, a first exhaust heat recovery line 3, and a first cold energy recovery circuit 4.

(First refrigeration device)
As shown in Figures 1 to 4, each of the multiple first refrigeration devices 20 includes at least a first refrigeration circuit 21 that circulates a first heat medium, and a first condenser 22 and a first evaporator 23 provided in the first refrigeration circuit 21. As shown in Figure 4, each of the multiple first refrigeration devices 20 further includes a first compressor 24 and a first expander 25 provided in the first refrigeration circuit 21. The first refrigeration circuit 21 is made up of a circulation system configured to circulate the first heat medium, and constitutes a refrigeration cycle using the first heat medium as a working medium.

The first compressor 24 is disposed downstream of the first evaporator 23 and upstream of the first condenser 22 in the flow direction of the first heat medium. The first compressor 24 is configured to boost the pressure of the first heat medium guided from the first evaporator 23. The first heat medium boosted by the first compressor 24 is guided to the first condenser 22. The first compressor 24 may be an electric compressor configured to be driven by power supplied from a power source (not shown).

The first expander 25 is disposed downstream of the first condenser 22 and upstream of the first evaporator 23 in the flow direction of the first heat medium. The first expander 25 is configured to expand the first heat medium guided from the first condenser 22. The first heat medium expanded by the first expander 25 is guided to the first evaporator 23. The first expander 25 may be an expansion valve, as shown in FIG. 4.

(First Condenser)
The first condenser 22 is configured to be capable of transferring thermal energy of the first heat medium to the second heat medium. In the first condenser 22, heat exchange is performed between the first heat medium flowing through the first condenser 22 and the second heat medium flowing through the first condenser 22, and exhaust heat generated in the first refrigeration circuit 21 is recovered by the second heat medium. Due to the heat exchange in the first condenser 22, the first heat medium flowing through the first condenser 22 is cooled by the second heat medium flowing through the first condenser 22 and condensed.

(First exhaust heat recovery line)
1 to 3, the first exhaust heat recovery line 3 forms a flow path for circulating the second heat medium, and is formed by, for example, piping. The first exhaust heat recovery line 3 is connected to each of the first condensers 22 of the multiple first refrigeration devices 20 so as to be able to circulate the second heat medium. The first exhaust heat recovery line 3 includes a second heat medium introduction line 31 for guiding the second heat medium to the first condenser 22 of each of the multiple first refrigeration devices 20, and a second heat medium discharge line 32 for discharging the second heat medium from the first condenser 22 of each of the multiple first refrigeration devices 20.

In the embodiment shown in Figures 1 to 3, the second heat medium introduction line 31 includes an introduction side main pipe 311 and a plurality of introduction side branch pipes 312. One end of each of the plurality of introduction side branch pipes 312 is connected to the introduction side main pipe 311 so as to be able to flow the second heat medium, and the other end is connected to the corresponding first condenser 22 so as to be able to flow the second heat medium. The second heat medium is guided from the introduction side main pipe 311 to each first condenser 22 via the introduction side branch pipe 312 corresponding to each first condenser 22.

In the embodiment shown in Figures 1 to 3, the second heat medium discharge line 32 includes a discharge side main pipe 321 and a plurality of discharge side branch pipes 322. One end of each of the plurality of discharge side branch pipes 322 is connected to the discharge side main pipe 321 so as to be able to flow the second heat medium, and the other end is connected to the corresponding first condenser 22 so as to be able to flow the second heat medium. The second heat medium is guided from each first condenser 22 to the discharge side main pipe 321 via the corresponding discharge side branch pipe 322.

(Cooling device)
In the embodiment shown in FIG. 1 to FIG. 3, the refrigeration system 1 further includes at least one (in the illustrated example, a plurality of) cooling devices 33 connected to the downstream end of the second heat medium discharge line 32 and configured to cool the second heat medium. In the illustrated embodiment, the first exhaust heat recovery line 3 forms a flow path for circulating the first heat medium, and the plurality of cooling devices 33 are connected to the upstream end of the second heat medium introduction line 31. The plurality of cooling devices 33 may be arranged in series or in parallel between the downstream end of the second heat medium discharge line 32 and the upstream end of the second heat medium introduction line 31. The plurality of cooling devices 33 may be, for example, an exhaust heat recovery device 33A configured to perform heat exchange between the second heat medium and a heat medium having a lower temperature than the second heat medium and recover the thermal energy of the second heat medium, or a cooler 33B configured to perform heat exchange between the second heat medium and outside air or a coolant having a lower temperature than the second heat medium and cool the second heat medium.

Since each of the multiple first refrigeration devices 20 is connected to a common first exhaust heat recovery line 3, by providing an exhaust heat recovery device 33A on the first exhaust heat recovery line 3, the exhaust heat recovery device 33A can collectively recover the exhaust heat discharged from the multiple first refrigeration devices 20, making exhaust heat recovery easy. The exhaust heat recovered by the exhaust heat recovery device 33A can be used as a heat source for equipment external to the refrigeration system 1, such as a heat pump.

In the embodiment shown in Figures 1 to 3, a pump (booster) 34 for boosting the pressure of the first heat medium is provided upstream of the connection position of the most upstream inlet branch pipe 312 in the second heat medium inlet line 31.

(First evaporator)
The first evaporator 23 is configured to be capable of transferring cold energy of the first heat medium to the third heat medium. In the first evaporator 23, heat exchange is performed between the first heat medium flowing through the first evaporator 23 and the third heat medium flowing through the first evaporator 23, and the cold generated in the first refrigeration circuit 21 is recovered by the third heat medium. Due to the heat exchange in the first evaporator 23, the first heat medium flowing through the first evaporator 23 is heated by the third heat medium flowing through the first evaporator 23 and evaporated.

(First cold recovery circuit)
1 to 3, the first cold energy recovery circuit 4 forms a flow path for circulating the third heat medium, and is formed by, for example, piping. The first refrigeration recovery circuit 4 is connected to the first evaporator 23 of each of the first refrigeration devices 20 so as to be able to circulate the third heat medium. The first refrigeration recovery circuit 4 is configured to store the third heat medium. a third heat medium introduction line 42 for introducing the third heat medium from the third heat medium storage tank 41 to the first evaporator 23 of each of the plurality of first refrigeration devices 20; and a third heat medium return line 43 for returning the third heat medium from the first evaporator 23 of each of the plurality of first refrigeration devices 20 to the third heat medium storage tank 41.

In the embodiment shown in Figures 1 to 3, the third heat medium introduction line 42 includes an inlet side main pipe 421, one end of which is connected to the liquid phase of the third heat medium storage tank 41 so as to be able to flow the liquid third heat medium, and a plurality of inlet side branch pipes 422. Each of the plurality of inlet side branch pipes 422 has one end connected to the inlet side main pipe 421 so as to be able to flow the third heat medium, and the other end connected to the corresponding first evaporator 23 so as to be able to flow the third heat medium. The third heat medium introduced from the third heat medium storage tank 41 to the inlet side main pipe 421 is introduced from the inlet side main pipe 421 to each first evaporator 23 via the inlet side branch pipes 422 corresponding to each first evaporator 23.

In the embodiment shown in Figures 1 to 3, the third heat medium return line 43 includes a discharge side main pipe 431, one end of which is connected to the third heat medium storage tank 41 so as to be able to flow the third heat medium, and a plurality of discharge side branch pipes 432. Each of the plurality of discharge side branch pipes 432 has one end connected to the discharge side main pipe 431 so as to be able to flow the third heat medium, and the other end connected to the corresponding first evaporator 23 so as to be able to flow the third heat medium. The third heat medium is led from each first evaporator 23 to the discharge side main pipe 431 via the corresponding discharge side branch pipe 432, and then led from the discharge side main pipe 431 to the third heat medium storage tank 41.

(First cold heat exchanger)
In the embodiment shown in FIGS. 1 to 3, the refrigeration system 1 is provided in a first cold heat recovery circuit 4, and performs heat exchange between a gas to be cooled and a third heat medium to cool the gas to be cooled. In the illustrated embodiment, the plurality of first cold-side heat exchangers 44 (441, 442) are provided. Each of these is disposed upstream of the connection position of the most upstream inlet branch pipe 422 in the third heat medium inlet line 42 .

A third heat medium that has recovered cold energy from each of the first refrigeration devices 20 is introduced into each of the multiple first cold side heat exchangers 44, and the gas to be cooled is cooled by the third heat medium. The gas to be cooled by the first cold side heat exchanger 44 may be a gas such as air present in the space to be cooled (e.g., inside the refrigerator), or may be a heat medium that exchanges heat with the gas. The space to be cooled is cooled by cooling the gas to be cooled by the first cold side heat exchanger 44. Each of the multiple first cold side heat exchangers 44 is preferably arranged in parallel in order to introduce a relatively low-temperature third heat medium to each of the first cold side heat exchangers 44. Note that each of the multiple first cold side heat exchangers 44 may be arranged in series.

In the embodiment shown in Figures 1 to 3, a pump (booster) 45 for boosting the pressure of the third heat medium is provided upstream of the first cold-side heat exchanger 44, which is the most upstream heat medium in the third heat medium introduction line 42.

Hereinafter, the multiple first refrigeration devices 20 in which the first exhaust heat recovery line 3 is connected to the first condenser 22 and the first cold heat recovery circuit 4 is connected to the first evaporator 23 are collectively defined as the first refrigeration device group 2. The objects to be cooled in the first refrigeration device group 2 are cooled by the cold energy generated collectively by the first refrigeration device group 2. It is preferable that each of the multiple first refrigeration devices 20 belonging to the first refrigeration device group 2 has a standardized structure and components that conform to the same standards. In this case, the refrigeration capacity of the first refrigeration device group 2 can be increased or decreased in stages by increasing or decreasing the number of operating units of the multiple first refrigeration devices 20, making it easier to control the operation of the first refrigeration device group 2.

The first refrigeration devices 20 belonging to the first refrigeration device group 2 can be placed at a location separate from the other first refrigeration devices 20. The multiple first refrigeration devices 20 belonging to the first refrigeration device group 2 can be placed in a centralized or distributed arrangement.

As shown in Figures 1 to 3, the refrigeration system 1 according to some embodiments includes another refrigeration device 11 different from the multiple first refrigeration devices 20 belonging to the first refrigeration device group 2 described above, and a second exhaust heat recovery line 12 through which a heat medium flows to recover thermal energy from the other refrigeration device 11, the second exhaust heat recovery line 12 being connected to at least one of the first cold heat recovery circuit 4 or the first exhaust heat recovery line 3 so that the heat medium can flow through it.

With the above configuration, each of the multiple first refrigeration devices 20 is connected to a common first exhaust heat recovery line 3 and a common first cold heat recovery circuit 4. Therefore, even if one first refrigeration device 20 stops due to a malfunction or the like, the refrigeration system 1 can be operated continuously by operating the other first refrigeration devices 20. Furthermore, the refrigeration system 1 can be restored to its original state simply by replacing only the malfunctioning first refrigeration device 20 with a new first refrigeration device 20. Such a refrigeration system 1 can easily ensure the stability of the refrigeration system 1.

Furthermore, according to the above configuration, the other refrigeration devices 11 are connected to at least one of the first cold heat recovery circuit 4 or the first exhaust heat recovery line 3 via the second exhaust heat recovery line 12, so that cold energy can be generated by the multiple first refrigeration devices 20 and the other refrigeration devices 11, and the refrigeration system 1 including the multiple first refrigeration devices 20 and the other refrigeration devices 11 can be prevented from becoming large and complicated.

Furthermore, according to the above configuration, by increasing or decreasing the number of the multiple first refrigeration devices 20 belonging to the first refrigeration device group 2, it is possible to increase or decrease the cold energy generated by the first refrigeration device group 2. Such a refrigeration system 1 has excellent scalability in the cooling capacity of the first refrigeration device group 2, can accommodate cooling targets of various sizes, and can flexibly increase or decrease the number and cooling capacity of the first refrigeration device group 2 according to the size of the cooling target.

In some embodiments, as shown in Figures 1 to 3, the other refrigeration device 11 described above includes at least a plurality of second refrigeration devices 50, and the refrigeration system 1 described above further includes a second cold energy recovery circuit 6.

(Second Refrigeration Device)
FIG. 5 is a diagram showing an example of the circuit of the second refrigeration device 50 shown in FIG. 1. FIG. 6 is a diagram showing an example of the circuit of the second refrigeration device 50 shown in FIG. 2 to FIG. 3. As shown in FIG. 1 to FIG. 3, FIG. 5 and FIG. 6, each of the second refrigeration devices 50 includes at least a second refrigeration circuit 51 that circulates a fourth heat medium, and a second condenser 52 and a second evaporator 53 provided in the second refrigeration circuit 51. As shown in FIG. 5 and FIG. 6, each of the second refrigeration devices 50 further includes a second compressor 54 and a second expander 55 provided in the second refrigeration circuit 51. The second refrigeration circuit 51 is composed of a circulation system configured to circulate the fourth heat medium, and constitutes a refrigeration cycle using the fourth heat medium as a working medium.

The second compressor 54 is disposed downstream of the second evaporator 53 and upstream of the second condenser 52 in the flow direction of the fourth heat medium. The second compressor 54 is configured to boost the pressure of the fourth heat medium guided from the second evaporator 53. The fourth heat medium boosted by the second compressor 54 is guided to the second condenser 52. The second compressor 54 may be an electric compressor configured to be driven by power supplied from a power source (not shown).

The second expander 55 is disposed downstream of the second condenser 52 and upstream of the second evaporator 53 in the flow direction of the fourth heat medium. The second expander 55 is configured to expand the fourth heat medium guided from the second condenser 52. The fourth heat medium expanded by the second expander 55 is guided to the second evaporator 53. The second expander 55 may be an expansion valve, as shown in FIG. 5.

(Second Condenser)
The second condenser 52 is configured to be able to transfer the thermal energy of the fourth heat medium to the second exhaust heat medium. In the embodiment shown in FIG. 1, the second exhaust heat recovery line 12 is connected to the first cold heat recovery circuit 4, so the third heat medium is the second exhaust heat medium. In the embodiment shown in FIG. 2, the second exhaust heat recovery line 12 is connected to the first exhaust heat recovery line 3, so the second heat medium is the second exhaust heat medium. In the embodiment shown in FIG. 3, the second exhaust heat recovery line 12 is selectively connected to both the first cold heat recovery circuit 4 and the first exhaust heat recovery line 3, so the second heat medium and the third heat medium, which are the same type of heat medium, are the second exhaust heat medium.

In the second condenser 52, heat exchange takes place between the fourth heat medium flowing through the second condenser 52 and the second heat medium for exhaust heat flowing through the second condenser 52, and the exhaust heat generated in the second refrigeration circuit 51 is recovered by the second heat medium for exhaust heat. Due to the heat exchange in the second condenser 52, the fourth heat medium flowing through the second condenser 52 is cooled by the second heat medium for exhaust heat flowing through the second condenser 52 and condenses.

(Second waste heat recovery line)
In the embodiment shown in Fig. 1 to Fig. 3, the second exhaust heat recovery line 12 forms a flow path for circulating the second exhaust heat medium, and is formed by, for example, piping. The second exhaust heat recovery line 12 is connected to each of the second condensers 52 of the multiple second refrigeration devices 50 so that the second exhaust heat medium can flow through it. The second exhaust heat recovery line 12 includes a second exhaust heat medium introduction line 13 for guiding the second exhaust heat medium to the second condenser 52 of each of the multiple second refrigeration devices 50, and a second exhaust heat medium discharge line 14 for discharging the second exhaust heat medium from the second condenser 52 of each of the multiple second refrigeration devices 50.

In the embodiment shown in Figs. 1 to 3, the second waste heat heat medium inlet line 13 includes an inlet side main pipe 131 and a plurality of inlet side branch pipes 132. One end of each of the plurality of inlet side branch pipes 132 is connected to the inlet side main pipe 131 so as to be able to flow the second waste heat heat medium, and the other end is connected to the corresponding second condenser 52 so as to be able to flow the second waste heat heat medium. The second waste heat heat medium is led from the inlet side main pipe 131 to each second condenser 52 via the inlet side branch pipe 132 corresponding to each second condenser 52.

In the embodiment shown in Figures 1 to 3, the second heat exhaust medium discharge line 14 includes a discharge side main pipe 141 and a plurality of discharge side branch pipes 142. One end of each of the plurality of discharge side branch pipes 142 is connected to the discharge side main pipe 141 so as to be able to flow the second heat exhaust medium, and the other end is connected to the corresponding second condenser 52 so as to be able to flow the second heat exhaust medium. The second heat exhaust medium is led from each second condenser 52 to the discharge side main pipe 141 via the corresponding discharge side branch pipe 142.

(Second evaporator)
The second evaporator 53 is configured to be capable of transferring cold energy of the fourth heat medium to the fifth heat medium. In the second evaporator 53, heat exchange is performed between the fourth heat medium flowing through the second evaporator 53 and the fifth heat medium flowing through the second evaporator 53, and the cold generated in the second refrigeration circuit 51 is recovered by the fifth heat medium. By the heat exchange in the second evaporator 53, the fourth heat medium flowing through the second evaporator 53 is heated by the fifth heat medium flowing through the second evaporator 53 and evaporates.

(Second cold heat recovery circuit)
1 to 3, the second cold energy recovery circuit 6 forms a flow path for circulating the fifth heat medium, and is formed by, for example, piping. The second refrigeration device 50 includes a second evaporator 53 connected to the second refrigeration device 50 so as to allow a fifth heat medium to flow therethrough. The second refrigeration recovery circuit 6 is configured to store the fifth heat medium. a fifth heat medium storage tank 61 and a fifth heat medium introduction line 62 for introducing the fifth heat medium from the fifth heat medium storage tank 61 to the second evaporator 53 of each of the plurality of second refrigeration devices 50. and a fifth heat medium return line 63 for returning the fifth heat medium from the second evaporator 53 of each of the plurality of second refrigeration devices 50 to the fifth heat medium storage tank 61.

In the embodiment shown in Figures 1 to 3, the fifth heat medium introduction line 62 includes an inlet side main pipe 621, one end of which is connected to the liquid phase of the fifth heat medium storage tank 61 so as to be able to flow the liquid fifth heat medium, and a plurality of inlet side branch pipes 622. Each of the plurality of inlet side branch pipes 622 has one end connected to the inlet side main pipe 621 so as to be able to flow the fifth heat medium, and the other end connected to the corresponding second evaporator 53 so as to be able to flow the fifth heat medium. The fifth heat medium introduced from the fifth heat medium storage tank 61 to the inlet side main pipe 621 is introduced from the inlet side main pipe 621 to each second evaporator 53 via the inlet side branch pipes 622 corresponding to each second evaporator 53.

In the embodiment shown in Figures 1 to 3, the fifth heat medium return line 63 includes a discharge side main pipe 631, one end of which is connected to the fifth heat medium storage tank 61 so as to be able to flow the fifth heat medium, and a plurality of discharge side branch pipes 632. Each of the plurality of discharge side branch pipes 632 has one end connected to the discharge side main pipe 631 so as to be able to flow the fifth heat medium, and the other end connected to the corresponding second evaporator 53 so as to be able to flow the fifth heat medium. The fifth heat medium is led from each second evaporator 53 to the discharge side main pipe 631 via the corresponding discharge side branch pipe 632, and then led from the discharge side main pipe 631 to the fifth heat medium storage tank 61.

(Second cold heat exchanger)
In the embodiment shown in FIGS. 1 to 3, the refrigeration system 1 is provided in the second cold heat recovery circuit 6, and performs heat exchange between the gas to be cooled and the fifth heat medium to cool the gas to be cooled. In the illustrated embodiment, the second cold side heat exchanger 64 (641, 642) is configured to have at least one second cold side heat exchanger 64 (641, 642). Each of these is disposed upstream of the connection position of the most upstream inlet side branch pipe 622 in the fifth heat medium inlet line 62 .

The fifth heat medium that recovers cold energy from each of the second refrigeration devices 50 is introduced into each of the multiple second cold side heat exchangers 64, and the gas to be cooled is cooled by the fifth heat medium. The gas to be cooled by the second cold side heat exchanger 64 may be a gas such as air present in the space to be cooled (for example, inside a freezer), or may be a heat medium that exchanges heat with the gas. The space to be cooled is cooled by cooling the gas to be cooled by the second cold side heat exchanger 64. The cooling target of each of the multiple second cold side heat exchangers 64 may be different from the cooling target of each of the multiple first cold side heat exchangers 44, or may be the same. It is preferable that each of the multiple second cold side heat exchangers 64 is arranged in parallel in order to introduce a relatively low-temperature fifth heat medium to each of the multiple second cold side heat exchangers 64. Note that each of the multiple second cold side heat exchangers 64 may be arranged in series.

In the embodiment shown in Figures 1 to 3, a pump (booster) 65 for boosting the pressure of the fifth heat medium is provided upstream of the second cold-side heat exchanger 64, which is the most upstream in the fifth heat medium introduction line 62.

Hereinafter, the multiple second refrigeration devices 50 in which the second exhaust heat recovery line 12 is connected to the second condenser 52 and the second cold heat recovery circuit 6 is connected to the second evaporator 53 are collectively defined as the second refrigeration device group 5. The objects to be cooled in the second refrigeration device group 5 are cooled by the cold energy generated collectively by the second refrigeration device group 5. It is preferable that each of the multiple second refrigeration devices 50 belonging to the second refrigeration device group 5 has a standardized structure and components that conform to the same standards. In this case, the refrigeration capacity of the second refrigeration device group 5 can be increased or decreased in stages by increasing or decreasing the number of operating units of the multiple second refrigeration devices 50, making it easier to control the operation of the second refrigeration device group 5.

The second refrigeration devices 50 belonging to the second refrigeration device group 5 can be placed in a location away from the other second refrigeration devices 50 and the first refrigeration device 20. The multiple second refrigeration devices 50 belonging to the second refrigeration device group 5 can be placed in a centralized or distributed arrangement.

Each of the multiple second refrigeration devices 50 is configured to suitably handle a temperature zone lower than the temperature zone that each of the multiple first refrigeration devices 20 suits. That is, the first refrigeration devices 20 and the second refrigeration devices 50 have different refrigeration capacity zones. In one embodiment, each of the multiple first refrigeration devices 20 is configured so that the temperature zone of the third heat medium introduced into the multiple first cold-side heat exchangers 44 is refrigeration (e.g., -10°C or higher and 10°C or lower). And each of the multiple second refrigeration devices 50 is configured so that the temperature zone of the fifth heat medium introduced into the multiple second cold-side heat exchangers 64 is freezing (e.g., -40°C or higher and -20°C or lower).

According to the above configuration, the refrigeration system 1 includes the above-mentioned multiple first refrigeration devices 20 and multiple second refrigeration devices 50. In this case, the efficiency of the refrigeration system 1 can be optimized by selectively operating the first refrigeration devices 20 and the second refrigeration devices 50, which have different refrigeration capacity bands.

In some embodiments, as shown in FIG. 1, the other refrigeration device 11 described above includes at least a plurality of second refrigeration devices 50, and the refrigeration system 1 described above further includes a second cold heat recovery circuit 6. As shown in FIG. 1, the second exhaust heat recovery line 12 described above is connected to the first cold heat recovery circuit 4 and the second condenser 52 of each of the plurality of second refrigeration devices 50 so as to be able to circulate a third heat medium.

In the embodiment shown in FIG. 1, the upstream end of the second waste heat heat medium inlet line 13, i.e., one end of the inlet side main pipe 131, is connected to the third heat medium inlet line 42 at a connection position P1 that is upstream of the first cold-heat side heat exchanger 44, which is the most upstream of the third heat medium inlet line 42, and downstream of the pump 45. This allows the third heat medium to be introduced from the third heat medium inlet line 42 to the second waste heat heat medium inlet line 13.

In the embodiment shown in FIG. 1, the downstream end of the second heat transfer medium discharge line 14, i.e., one end of the discharge side main pipe 141, is connected to the third heat transfer medium inlet line 42 at a connection position P2 downstream of the most downstream first cold-side heat exchanger 44 in the third heat transfer medium inlet line 42 and upstream of the connection position of the most upstream inlet side branch pipe 422. This allows the third heat transfer medium to be introduced from the second heat transfer medium discharge line 14 to the third heat transfer medium inlet line 42.

With the above configuration, the second exhaust heat recovery line 12 is connected to the first cold heat recovery circuit 4, so that the exhaust heat discharged from the multiple second refrigeration devices 50 can be collectively recovered in the first cold heat recovery circuit 4. In this case, the condensation pressure of the second condenser 52 of each of the multiple second refrigeration devices 50 can be kept relatively low, making it easier to maintain the refrigeration capacity of the multiple second refrigeration devices 50 regardless of the outside air temperature.

In some embodiments, as shown in FIG. 2, the other refrigeration device 11 described above includes at least a plurality of second refrigeration devices 50, and the refrigeration system 1 described above further includes a second cold heat recovery circuit 6. As shown in FIG. 2, the second exhaust heat recovery line 12 described above is connected to the first exhaust heat recovery line 3 and the second condensers 52 of each of the plurality of second refrigeration devices 50 so as to be able to circulate the second heat medium.

In the embodiment shown in FIG. 2, the upstream end of the second waste heat heat medium inlet line 13, i.e., one end of the inlet side main pipe 131, is connected to the second heat medium inlet line 31 at a connection position P3 upstream of the connection position of the most upstream inlet side branch pipe 312 in the second heat medium inlet line 31 and downstream of the pump 34. This allows the second heat medium to be introduced from the second heat medium inlet line 31 to the second waste heat heat medium inlet line 13.

In the embodiment shown in FIG. 2, the downstream end of the second heat medium discharge line 14 for exhausting heat, i.e., one end of the discharge side main pipe 141, is connected to the second heat medium discharge line 32 at a connection position P4 downstream of the connection position of the most downstream discharge side branch pipe 322 in the second heat medium discharge line 32. This allows the second heat medium to be introduced from the second heat medium discharge line 14 for exhausting heat to the second heat medium discharge line 32.

According to the above configuration, by connecting the second exhaust heat recovery line 12 to the first exhaust heat recovery line 3, the exhaust heat discharged from the multiple second refrigeration devices 50 can be collected together and recovered in the first exhaust heat recovery line 3. In this case, the refrigeration capacity of the multiple first refrigeration devices 20 can be reduced compared to when the exhaust heat discharged from the multiple second refrigeration devices 50 is collected together and recovered in the first cold heat recovery circuit 4, so the manufacturing cost of the refrigeration system 1 can be reduced. In addition, according to the above configuration, by connecting the second exhaust heat recovery line 12 to the first exhaust heat recovery line 3, the difference in pressure loss between the multiple first refrigeration devices 20 and the difference in pressure loss between the multiple second refrigeration devices 50 can be reduced compared to when the exhaust heat discharged from the multiple second refrigeration devices 50 is collected together and recovered in the first cold heat recovery circuit 4, so the construction of the refrigeration system 1 is easier.

In some embodiments, as shown in FIG. 3, the other refrigeration device 11 includes at least a plurality of second refrigeration devices 50, and the refrigeration system 1 further includes a second cold heat recovery circuit 6. The second heat medium and the third heat medium are made of the same type of heat medium (second exhaust heat medium). As shown in FIG. 3, the second exhaust heat recovery line 12 is connected to the third heat medium inlet line 42 via the first inlet line 81, connected to the second heat medium inlet line 31 via the second inlet line 82, connected to the third heat medium return line 43 via the first exhaust line 83, and connected to the second heat medium exhaust line 32 via the second exhaust line 84. The refrigeration system 1 further includes a plurality of flow rate control valves 85, 86, 87, and 88 configured to adjust the flow rate of the heat medium flowing through each of the first inlet line 81, the second inlet line 82, the first exhaust line 83, and the second exhaust line 84.

In the embodiment shown in FIG. 3, one end of the first inlet line 81 is connected to the third heat medium inlet line 42 at the connection position P1 described above. One end of the second inlet line 82 is connected to the second heat medium inlet line 31 at the connection position P3 described above. The other end of the first inlet line 81 and the other end of the second inlet line 82 are each connected to the upstream end of the second exhaust heat medium inlet line 13, i.e., one end of the inlet side main pipe 131, at the connection position P5.

In the embodiment shown in FIG. 3, one end of the first discharge line 83 is connected to the third heat medium introduction line 42 at the connection position P2 described above. One end of the second discharge line 84 is connected to the second heat medium discharge line 32 at the connection position P4 described above. The other end of the first discharge line 83 and the other end of the second discharge line 84 are each connected to the downstream end of the second waste heat heat medium discharge line 14, i.e., one end of the discharge side main pipe 141, at the connection position P6.

In the embodiment shown in FIG. 3, the above-mentioned multiple flow rate adjustment valves 85, 86, 87, and 88 are:
The system includes a flow rate control valve 85 provided in the first inlet line 81, a flow rate control valve 86 provided in the second inlet line 82, a flow rate control valve 87 provided in the first exhaust line 83, and a flow rate control valve 88 provided in the second exhaust line 84. These flow rate control valves 85, 86, 87, 88 may be on-off valves whose opening degree can be adjusted to fully closed and fully open, or may be opening degree control valves whose opening degree can be adjusted to fully closed, fully open, and at least one intermediate opening degree between them.

By opening the flow rate control valves 85 and 87 and closing the flow rate control valves 86 and 88, it is possible to bring about a state in which the exhaust heat discharged from the multiple second refrigeration devices 50 is collected and recovered in the first heat recovery circuit 4. By opening the flow rate control valves 86 and 88 and closing the flow rate control valves 85 and 87, it is possible to bring about a state in which the exhaust heat discharged from the multiple second refrigeration devices 50 is collected and recovered in the first heat recovery line 3.

With the above configuration, by opening and closing the multiple flow rate control valves 85, 86, 87, 88, it is possible to selectively switch between a state in which the exhaust heat discharged from the multiple second refrigeration devices 50 is collectively recovered in the first cold heat recovery circuit 4, and a state in which the exhaust heat is collectively recovered in the first exhaust heat recovery line 3. In this case, it is possible to timely utilize the advantages of a state in which the exhaust heat discharged from the multiple second refrigeration devices 50 is collectively recovered in the first cold heat recovery circuit 4, and a state in which the exhaust heat is collectively recovered in the first exhaust heat recovery line 3.

In addition, instead of the above-mentioned flow rate adjustment valves 85 and 86, a three-way valve capable of switching the inlet of the second heat transfer medium to the first inlet line 81 and the second inlet line 82 may be placed at connection position P5. Also, instead of the above-mentioned flow rate adjustment valves 87 and 88, a three-way valve capable of switching the outlet of the second heat transfer medium to the first outlet line 83 and the second outlet line 84 may be placed at connection position P6.

(Specific example of first refrigeration device)
In some embodiments, as shown in Fig. 4, each of the above-mentioned multiple first refrigeration devices 20 further includes an outer frame 26 surrounding the first refrigeration circuit 21, the first condenser 22, the first evaporator 23, the first compressor 24, and the first expander 25, which are the components of the first refrigeration device 20. In the illustrated embodiment, the outer frame 26 is a housing that forms an internal space for accommodating the components of the first refrigeration device 20, but may be a frame body (framework) consisting of a plurality of frames surrounding the components of the first refrigeration device 20. In the illustrated embodiment, the outer frame 26 is formed with an insertion hole 261 through which the inlet side branch pipe 312 connected to the first condenser 22 is inserted, an insertion hole 262 through which the discharge side branch pipe 322 connected to the first condenser 22 is inserted, an insertion hole 263 through which the inlet side branch pipe 422 connected to the first evaporator 23 is inserted, and an insertion hole 264 through which the discharge side branch pipe 432 connected to the first evaporator 23 is inserted.

In some embodiments, as shown in FIG. 4, each of the plurality of first refrigeration devices 20 described above further includes a controller 27 for controlling the components of the first refrigeration device 20. In the illustrated embodiment, the controller 27 is housed inside the outer frame 26. The controller 27 is an electronic control unit for controlling the components of the first refrigeration device 20, and is configured as a microcomputer including a CPU (processor) (not shown), memories such as ROM and RAM, storage devices such as external storage devices, an I/O interface, a communication interface, and the like. The controller 27 is configured to control the output of the first compressor 24, for example, so that the temperature of the third heat medium discharged from the first evaporator 23 becomes a target temperature.

As shown in FIG. 4, each of the first refrigeration devices 20 may further include a buffer tank 28 provided in the first refrigeration circuit 21 and configured to store the first heat medium. The compressor 24 may be a single-stage compressor having a single-stage compression mechanism 241.

(Specific example of second refrigeration device)
In some embodiments, as shown in Fig. 5 and Fig. 6, each of the above-mentioned multiple second refrigeration devices 50 further includes an outer frame 56 surrounding the components of the second refrigeration device 50, that is, the second refrigeration circuit 51, the second condenser 52, the second evaporator 53, the second compressor 54, and the second expander 55. In the illustrated embodiment, the outer frame 56 is a housing that forms an internal space that houses the components of the second refrigeration device 50, but may be a frame body (framework) consisting of a plurality of frames that surround the components of the second refrigeration device 50. In the illustrated embodiment, the outer frame 56 is formed with an insertion hole 561 through which the inlet side branch pipe 132 connected to the second condenser 52 is inserted, an insertion hole 562 through which the discharge side branch pipe 142 connected to the second condenser 52 is inserted, an insertion hole 563 through which the inlet side branch pipe 622 connected to the second evaporator 53 is inserted, and an insertion hole 564 through which the discharge side branch pipe 632 connected to the second evaporator 53 is inserted.

In some embodiments, as shown in FIG. 5 and FIG. 6, each of the plurality of second refrigeration devices 50 described above further includes a controller 57 for controlling the components of the second refrigeration device 50. In the illustrated embodiment, the controller 57 is housed inside the outer frame 56. The controller 57 is an electronic control unit for controlling the components of the second refrigeration device 50, and is configured as a microcomputer including a CPU (processor) (not shown), memories such as ROM and RAM, storage devices such as an external storage device, an I/O interface, a communication interface, and the like. The controller 57 is configured to control the output of the second compressor 54, for example, so that the temperature of the fifth heat medium discharged from the second evaporator 53 becomes a target temperature.

In the embodiment shown in Figures 1 to 3, the refrigeration system 1 further includes a general controller 100 connected to each of the controllers 27 of the multiple first refrigeration devices 20 and each of the controllers 57 of the multiple second refrigeration devices 50 so as to be capable of transmitting and receiving electrical signals. The general controller 100 is an electronic control unit for controlling the operation of the refrigeration system 1, and is configured as a microcomputer including a CPU (processor) (not shown), memories such as ROM and RAM, storage devices such as external storage devices, an I/O interface, a communication interface, etc.

The general controller 100 may determine whether to operate or stop each of the multiple first refrigeration devices 20 belonging to the first refrigeration device group 2 and the multiple second refrigeration devices 50 belonging to the second refrigeration device group 5, and may transmit an operation signal indicating whether to operate or not to the controllers 27, 57 of each refrigeration device 20, 50 based on the above determination. The controllers 27, 57 may control the operation or stop of the corresponding refrigeration devices 20, 50 in response to the operation signal from the general controller 100.

When each of the multiple first refrigeration devices 20 operates so that the temperature of the third heat medium discharged from the first evaporator 23 becomes the target temperature, the general controller 100 may set the target temperature for each of the multiple first refrigeration devices 20. The general controller 100 may set the target temperature for each of the multiple first refrigeration devices 20, for example, so that the operating load of the compressor 24 of each first refrigeration device 20 is uniform. The general controller 100 may integrate the rotation speed and operating time of the compressor 24 of each first refrigeration device 20, check the operating status of the compressor 24 of each first refrigeration device 20, and set the target temperature of the first refrigeration device 20 with a high operating load of the compressor 24 higher than the target temperature of the other first refrigeration devices 20, thereby lowering the rotation speed of the compressor 24 of the first refrigeration device 20 with a high operating load.

In addition, the general controller 100 stops some of the first refrigeration devices 20 belonging to the first refrigeration device group 2 when the refrigeration load of the first refrigeration devices 20 is small, and by rotating the first refrigeration devices 20 that are stopped when the refrigeration load is small, it is possible to prevent the operating load of a particular first refrigeration device 20 from becoming too high.

When each of the multiple second refrigeration devices 50 operates so that the temperature of the fifth heat medium discharged from the second evaporator 53 becomes the target temperature, the general controller 100 may set the target temperature for each of the multiple second refrigeration devices 50. The general controller 100 may set the target temperature for each of the multiple second refrigeration devices 50, for example, so that the operating load of the compressor 54 of each second refrigeration device 50 is uniform. The general controller 100 may integrate the rotation speed and operating time of the compressor 54 of each second refrigeration device 50, check the operating status of the compressor 54 of each second refrigeration device 50, and set the target temperature of the second refrigeration device 50 with a high operating load of the compressor 54 higher than the target temperature of the other second refrigeration devices 50, thereby lowering the rotation speed of the compressor 54 of the second refrigeration device 50 with a high operating load.

In addition, the general controller 100 stops some of the second refrigeration devices 50 belonging to the second refrigeration device group 5 when the refrigeration load of the devices is small, and rotates the second refrigeration devices 50 that are stopped when the refrigeration load is small, thereby preventing the operating load of a particular second refrigeration device 50 from becoming too high.

The general controller 100 may compare the refrigeration load of the first refrigeration device group 2 with that of the second refrigeration device group 5 and circulate the amount of heat medium to the refrigeration device group with a higher refrigeration load than to the refrigeration device group with a lower refrigeration load. The general controller 100 may also control the operation of each refrigeration device 20, 50 so that the sum of the power consumption of the first refrigeration device group 2 and the power consumption of the second refrigeration device group 5 is minimized, or may control the operation of each refrigeration device 20, 50 so that the sum does not exceed a predetermined value. The general controller 100 may predict the refrigeration load of the first refrigeration device group 2 and the refrigeration load of the second refrigeration device group 5 based on a preset pre-cooling schedule and control the operation of each refrigeration device 20, 50.

As shown in FIG. 5, each of the second refrigeration devices 50 may further include a buffer tank 58 provided in the second refrigeration circuit 51 and configured to store the fourth heat medium. The compressor 54 may be a single-stage compressor having a single-stage compression mechanism 541.

The compressor 54 described above may be a two-stage compressor 54A having two stages of compression mechanisms 542, 543 arranged in series, as shown in FIG. 6. When the exhaust heat discharged from the multiple second refrigeration devices 50 is collected and recovered in the first exhaust heat recovery line 3, the pressure ratio required for each compressor 54 of the multiple second refrigeration devices 50 is larger than when the exhaust heat discharged from the multiple second refrigeration devices 50 is collected and recovered in the first cold heat recovery circuit 4. By making the compressor 54 of each of the multiple second refrigeration devices 50 a two-stage compressor 54A, it becomes possible to easily meet the required pressure ratio.

Each of the above-mentioned multiple second refrigeration devices 50 may further include a gas-liquid separator 591, a gas flow path 592, a check valve 593, and a front-stage expander 594, as shown in FIG. 6. The gas-liquid separator 591 is provided downstream of the second condenser 52 of the second refrigeration circuit 51 and upstream of the second expander 55, and is configured to separate the fourth heat medium into a gas phase and a liquid phase. The front-stage expander 594 is provided downstream of the second condenser 52 of the second refrigeration circuit 51 and upstream of the gas-liquid separator 591, and is configured to expand the fourth heat medium. The gas flow path 592 is a flow path that takes out the gaseous fourth heat medium from the gas phase of the gas-liquid separator 591 and guides it between the compression mechanisms 542 and 543 of the two-stage compressor 54A. The check valve 593 is for suppressing backflow of the gaseous fourth heat medium to the gas-liquid separator 591 in the gas flow path 592. By directing the gaseous fourth heat medium between the compression mechanisms 542 and 543 of the two-stage compressor 54A via the gas flow path 592, the efficiency of the second refrigeration device 50 can be improved.

In some embodiments, as shown in FIG. 4, the refrigeration system 1 further includes a plurality of flow control valves 9 (91, 92, 93, 94) individually provided for each of the plurality of first refrigeration devices 20. The plurality of flow control valves 9 are configured to be capable of adjusting the flow rate of the heat medium flowing through the inlet side branch pipe 312 connected to the first condenser 22 of the second heat medium inlet line 31 and the inlet side branch pipe 422 connected to the first evaporator 23 of the third heat medium inlet line 42.

In the embodiment shown in FIG. 4, the inlet branch pipe 312 is provided with a manual valve 91 that is manually opened and closed, and an automatic valve 92 that is electrically driven and opened and closed in response to an opening/closing command from the controller 27. In the embodiment shown in the figure, the manual valve 91 is disposed outside the insertion hole 261 or the outer frame body 26, and the automatic valve 92 is disposed inside the outer frame body 26.

In the embodiment shown in FIG. 4, the inlet branch pipe 422 is provided with a manual valve 93 that is manually opened and closed, and an automatic valve 94 that is electrically driven and opened and closed in response to an opening/closing command from the controller 27. In the embodiment shown in the figure, the manual valve 93 is disposed outside the insertion hole 263 or the outer frame body 26, and the automatic valve 94 is disposed inside the outer frame body 26. Note that the multiple flow rate adjustment valves 9 described above may be either a combination of the manual valves 91 and 93 or a combination of the automatic valves 92 and 94.

With the above configuration, by closing the multiple flow rate control valves 9, the target first refrigeration device 20 can be disconnected from the common first exhaust heat recovery line 3 and the common first cold heat recovery circuit 4. In this case, it is possible to reduce pressure loss when the target first refrigeration device 20 is in a stopped state.

In some embodiments, as shown in FIG. 4, the above-mentioned refrigeration system 1 includes a plurality of flow control valves 9 (91, 92, 95, 96) provided individually for each of the plurality of first refrigeration devices 20. The flow control valve 95 is a manual valve provided in the discharge side branch pipe 322 connected to the first condenser 22 of the second heat medium discharge line 32 and opened and closed by manual operation. The flow control valve 96 is a manual valve provided in the discharge side branch pipe 432 connected to the first evaporator 23 of the third heat medium return line 43 and opened and closed by manual operation. The flow control valves 95, 96 are arranged outside the insertion holes 262, 264 or the outer frame body 26. In this case, by closing the plurality of flow control valves 9 (91, 92, 95, 96), the connection of the target first refrigeration device 20 to the common first exhaust heat recovery line 3 and the common first cold heat recovery circuit 4 can be released. In this case, it becomes easier to remove the first refrigeration device 20 from the refrigeration system 1.

In some embodiments, as shown in Figs. 5 and 6, the above-mentioned refrigeration system 1 further includes a plurality of flow control valves 10 (101, 102, 103, 104) individually provided for each of the plurality of second refrigeration devices 50. The plurality of flow control valves 10 are configured to be capable of adjusting the flow rate of the heat medium flowing through each of the inlet side branch pipe 132 connected to the second condenser 52 and the inlet side branch pipe 622 connected to the second evaporator 53.

In the embodiment shown in Figures 5 and 6, the inlet branch pipe 132 is provided with a manual valve 101 that is opened and closed by manual operation, and an automatic valve 102 that is electrically driven and opened and closed by an opening/closing command from the controller 57. In the illustrated embodiment, the manual valve 101 is disposed outside the insertion hole 561 or the outer frame body 56, and the automatic valve 102 is disposed inside the outer frame body 56.

5 and 6, the inlet branch pipe 622 is provided with a manual valve 103 that is manually opened and closed, and an automatic valve 104 that is electrically driven and opened and closed in response to an opening/closing command from the controller 57. In the illustrated embodiment, the manual valve 103 is disposed outside the insertion hole 563 or the outer frame 56, and the automatic valve 104 is disposed inside the outer frame 56. The multiple flow rate control valves 10 described above may be either a combination of the manual valves 101 and 103 or a combination of the automatic valves 102 and 104.

With the above configuration, by closing the multiple flow rate control valves 10, the target second refrigeration device 50 can be disconnected from the common second exhaust heat recovery line 12 and the common second cold heat recovery circuit 6. In this case, the pressure loss when the target second refrigeration device 50 is in a stopped state can be reduced.

In some embodiments, as shown in FIG. 5 and FIG. 6, the above-mentioned refrigeration system 1 includes a plurality of flow control valves 10 (101, 102, 105, 106) provided individually for each of the plurality of second refrigeration devices 50. The flow control valve 105 is a manual valve provided in the discharge side branch pipe 142 connected to the second condenser 52 and opened and closed by manual operation. The flow control valve 106 is a manual valve provided in the discharge side branch pipe 632 connected to the second evaporator 53 and opened and closed by manual operation. The flow control valves 105, 106 are arranged outside the insertion holes 562, 564 or the outer frame body 56. In this case, by closing the plurality of flow control valves 10 (101, 102, 105, 106), the connection of the target second refrigeration device 50 to the common second exhaust heat recovery line 12 and the common second cold heat recovery circuit 6 can be disconnected. In this case, it becomes easier to remove the second refrigeration device 50 from the refrigeration system 1.

In some embodiments, the first heat medium circulating through the first refrigeration circuit 21 of each of the above-mentioned first refrigeration devices 20 is made of carbon dioxide. By using carbon dioxide as the first heat medium, which is the refrigerant of each of the first refrigeration devices 20, each of the first refrigeration devices 20 can be installed either outdoors or indoors, so there is a high degree of freedom in the installation location of each of the first refrigeration devices 20. In addition, by using carbon dioxide as the first heat medium, the maintenance costs of the first refrigeration devices 20 can be reduced compared to when the first heat medium is ammonia or the like. If the first heat medium is ammonia, equipment is required to neutralize ammonia, so the installation area of the refrigeration system 1 increases and labor is required for maintenance, which may lead to high maintenance costs. In addition, if the first heat medium is ammonia, the first refrigeration device 20 becomes relatively large, so there is a risk that the installation location will be limited to outdoors.

In some embodiments, the fourth heat medium circulating through the second refrigeration circuit 51 of each of the multiple second refrigeration devices 50 described above is made of carbon dioxide. By using carbon dioxide as the fourth heat medium, which is the refrigerant of each of the multiple second refrigeration devices 50, each of the multiple second refrigeration devices 50 can be installed either outdoors or indoors, which increases the degree of freedom in the installation location of each of the multiple second refrigeration devices 50. In addition, by using carbon dioxide as the fourth heat medium, the maintenance costs of the multiple second refrigeration devices 50 can be reduced compared to when the fourth heat medium is ammonia or the like.

FIG. 7 is a schematic perspective view of a refrigeration system according to one embodiment of the present disclosure. In some embodiments, each of the above-mentioned multiple first refrigeration devices 20 includes the above-mentioned outer frame body 26 (see FIGS. 1 to 4) that surrounds the first refrigeration circuit 21, the first condenser 22, and the first evaporator 23. The above-mentioned multiple first refrigeration devices 20 include two or more first refrigeration devices 20 whose outer frame bodies 26 are stacked on top of each other.

With the above configuration, by arranging two or more first refrigeration devices 20 with their outer frame bodies 26 stacked on top of each other, it is possible to reduce the horizontal installation space required for the multiple first refrigeration devices 20. Note that two or more second refrigeration devices 50 may be arranged with their outer frame bodies 56 stacked on top of each other, or with the outer frame body 26 stacked on top of the outer frame body 56, or with the outer frame body 56 stacked on top of the outer frame body 26.

(How to modify a refrigeration system)
A method of retrofitting a refrigeration system 01 according to a comparative example to a refrigeration system 1 according to an embodiment of the present disclosure will be described below. Fig. 8 is a schematic perspective view of the refrigeration system 01 according to the comparative example. Fig. 9 is a schematic perspective view of the refrigeration system in an intermediate state when retrofitting the refrigeration system 01 according to the comparative example to the refrigeration system 1 according to an embodiment of the present disclosure.

As shown in FIG. 8, the refrigeration system 01 according to the comparative example includes an ammonia refrigerator 15A (15) that uses ammonia as a refrigerant and is connected to the first exhaust heat recovery line 3 and the first cold heat recovery circuit 4. The refrigeration system 01 according to the comparative example may further include an ammonia refrigerator 15B (15) that uses ammonia as a refrigerant and is connected to the second exhaust heat recovery line 12 and the second cold heat recovery circuit 6.

As shown in FIG. 9, the above-mentioned multiple first refrigeration devices 20 are added to the refrigeration system 01 according to the comparative example. Specifically, after installing the multiple first refrigeration devices 20, they are connected to the first exhaust heat recovery line 3 and the first cold heat recovery circuit 4. Note that the above-mentioned multiple second refrigeration devices 50 may be added to the refrigeration system 01 according to the comparative example. Specifically, after installing the multiple second refrigeration devices 50, they are connected to the second exhaust heat recovery line 12 and the second cold heat recovery circuit 6. In the intermediate state as shown in FIG. 9, the above-mentioned ammonia refrigerator 15 (15A, 15B), the multiple first refrigeration devices 20, and the multiple second refrigeration devices 50 may generate cold energy for cooling the cooling target.

As shown in FIG. 7, in a refrigeration system in an intermediate state, the ammonia refrigerator 15 (15A, 15B) is disconnected from the connected line and removed from the refrigeration system to form the refrigeration system 1 according to one embodiment of the present disclosure. Note that in the case where the refrigeration system 01 according to the comparative example does not include the ammonia refrigerator 15B, multiple second refrigeration devices 50 and a second cold energy recovery circuit 6 may be added.

In some of the embodiments described above, the other refrigeration device 11 described above includes multiple second refrigeration devices 50, but it does not have to include multiple second refrigeration devices 50.

In some embodiments, the first heat medium circulating through the first refrigeration circuit 21 of each of the plurality of first refrigeration devices 20 described above is made of carbon dioxide. The other refrigeration device 11 described above includes an ammonia refrigerator 15 that uses ammonia as a refrigerant, as shown in FIG. 9.

With the above configuration, the multiple first refrigeration devices 20 and the ammonia refrigerator 15 use different refrigerants and have different refrigerant characteristics such as COP (coefficient of performance)/temperature curves. Depending on the load, refrigeration capacity, required temperature range, etc. of the refrigeration system 1, the multiple first refrigeration devices 20 and the ammonia refrigerator 15 can be used separately according to their respective refrigerant characteristics, thereby improving the operating efficiency of the refrigeration system 1.

In this specification, expressions expressing relative or absolute configuration, such as "in a certain direction,""along a certain direction,""parallel,""orthogonal,""center,""concentric," or "coaxial," do not only strictly represent such a configuration, but also represent a state in which there is a relative displacement with a tolerance or an angle or distance to the extent that the same function is obtained.
For example, expressions indicating that things are in an equal state, such as "identical,""equal," and "homogeneous," not only indicate a state of strict equality, but also indicate a state in which there is a tolerance or a difference to the extent that the same function is obtained.
Furthermore, in this specification, expressions describing shapes such as a rectangular shape or a cylindrical shape do not only refer to shapes such as a rectangular shape or a cylindrical shape in the strict geometric sense, but also refer to shapes that include uneven portions, chamfered portions, etc., to the extent that the same effect can be obtained.
In addition, in this specification, the expressions "comprise,""include," or "have" a certain element are not exclusive expressions that exclude the presence of other elements.

This disclosure is not limited to the above-described embodiments, but also includes modifications to the above-described embodiments and appropriate combinations of these embodiments.

The contents described in the above-mentioned embodiments can be understood, for example, as follows:

1) At least one embodiment of the refrigeration system (1) according to the present disclosure comprises:
a first refrigeration circuit (21) for circulating a first heat medium;
a first condenser (22) provided in the first refrigeration circuit (21) and configured to be capable of transferring thermal energy of the first heat medium to a second heat medium; and a first evaporator (23) provided in the first refrigeration circuit (21) and configured to be capable of transferring cold energy of the first heat medium to a third heat medium;
a first exhaust heat recovery line (3) through which the second heat medium flows, the first exhaust heat recovery line (3) being connected to each of the first condensers (22) of the plurality of first refrigeration devices (20) so as to be capable of flowing the second heat medium;
a first cold heat recovery circuit (4) for circulating the third heat medium, the first cold heat recovery circuit (4) being connected to the first evaporator (23) of each of the plurality of first refrigeration devices (4) so as to be capable of flowing the third heat medium;
a refrigeration device (11) different from the plurality of first refrigeration devices (20);
The system further includes a second exhaust heat recovery line (12) through which a heat medium flows for recovering thermal energy from the other refrigeration device (11), the second exhaust heat recovery line (12) being connected to at least one of the first cold heat recovery circuit (4) or the first exhaust heat recovery line (3) so that the heat medium can flow through the second exhaust heat recovery line (12).

According to the configuration of 1) above, each of the multiple first refrigeration devices (20) is connected to a common first exhaust heat recovery line (3) and a common first cold heat recovery circuit (4), so even if one first refrigeration device (20) stops due to a malfunction or the like, the refrigeration system (1) can be operated continuously by operating the other first refrigeration devices (20). Furthermore, the refrigeration system (1) can be restored to its original state simply by replacing only the malfunctioning first refrigeration device (20) with a new first refrigeration device (20). Such a refrigeration system (1) can easily ensure the stability of the refrigeration system (1).

Furthermore, according to the configuration of 1) above, since the other refrigeration devices (11) are connected to at least one of the first cold heat recovery circuit (4) or the first exhaust heat recovery line (3) via the second exhaust heat recovery line (12), cold energy can be generated by the multiple first refrigeration devices (20) and the other refrigeration devices (11), and the refrigeration system 1 including the multiple first refrigeration devices (20) and the other refrigeration devices (11) can be prevented from becoming large and complicated.

2) In some embodiments, the refrigeration system (1) according to 1) above,
The other refrigeration device (11) is
a second refrigeration circuit (51) for circulating a fourth heat medium;
the second refrigeration circuit (51) includes a second condenser (52) configured to be capable of transferring thermal energy of the fourth heat medium to the third heat medium, and a second evaporator (53) configured to be capable of transferring cold energy of the fourth heat medium to a fifth heat medium,
the second exhaust heat recovery line (12) is connected to the first cold heat recovery circuit (4) and the second condensers (52) of each of the plurality of second refrigeration devices (50) so as to be capable of circulating the third heat medium;
The refrigeration system (1) comprises:
The system further includes a second cold heat recovery circuit (6) for circulating the fifth heat medium, the second cold heat recovery circuit (6) being connected to the second evaporator (53) of each of the plurality of second refrigeration devices (50) so as to allow the fifth heat medium to flow therethrough.

According to the configuration of 2) above, the refrigeration system (1) includes a plurality of first refrigeration devices (20) and a plurality of second refrigeration devices (50). In this case, the efficiency of the refrigeration system (1) can be optimized by selectively operating the first refrigeration devices (20) and the second refrigeration devices (50) having different refrigeration capacity bands. In addition, according to the configuration of 2) above, the second exhaust heat recovery line (12) is connected to the first cold heat recovery circuit (4), so that the exhaust heat discharged from the plurality of second refrigeration devices (50) can be collectively recovered in the first cold heat recovery circuit (4). In this case, the condensation pressure of the second condenser (52) of each of the plurality of second refrigeration devices (50) can be kept relatively low, making it easy to maintain the refrigeration capacity of the plurality of second refrigeration devices (50) regardless of the outside air temperature.

3) In some embodiments, the refrigeration system (1) according to 1) above,
The other refrigeration device (11) is
a second refrigeration circuit (51) for circulating a fourth heat medium;
the second refrigeration circuit (51) includes at least a plurality of second refrigeration devices (50), each including a second condenser (52) provided in the second refrigeration circuit (51) and configured to be capable of transferring thermal energy of the fourth heat medium to the second heat medium, and a second evaporator (53) provided in the second refrigeration circuit (51) and configured to be capable of transferring cold energy of the fourth heat medium to a fifth heat medium,
the second exhaust heat recovery line (12) is connected to the first exhaust heat recovery line (3) and the second condensers (52) of each of the plurality of second refrigeration devices (50) so as to be able to circulate the second heat medium;
The refrigeration system (1) comprises:
The system further includes a second cold heat recovery circuit (6) for circulating the fifth heat medium, the second cold heat recovery circuit (6) being connected to the second evaporator (53) of each of the plurality of second refrigeration devices (50) so as to allow the fifth heat medium to flow therethrough.

According to the above configuration 3), the refrigeration system (1) includes a plurality of first refrigeration devices (20) and a plurality of second refrigeration devices (50). In this case, the efficiency of the refrigeration system (1) can be optimized by selectively operating the first refrigeration devices (20) and the second refrigeration devices (50) having different refrigeration capacity bands. Also, according to the above configuration 3), the second exhaust heat recovery line (12) is connected to the first exhaust heat recovery line (3), so that the exhaust heat discharged from the plurality of second refrigeration devices (50) can be collected and recovered in the first exhaust heat recovery line (3). In this case, the refrigeration capacity of the plurality of first refrigeration devices (20) can be reduced compared to the case where the exhaust heat discharged from the plurality of second refrigeration devices (50) is collected and recovered in the first cold heat recovery circuit (4), and therefore the manufacturing cost of the refrigeration system (1) can be reduced. In addition, according to the configuration of 3), the second exhaust heat recovery line (12) is connected to the first exhaust heat recovery line (3), so that the difference in pressure loss between the multiple first refrigeration devices (20) and the difference in pressure loss between the multiple second refrigeration devices (50) can be made smaller than when the exhaust heat discharged from the multiple second refrigeration devices (50) is collected and recovered in the first cold heat recovery circuit (4), making it easier to build the refrigeration system (1).

4) In some embodiments, the refrigeration system (1) according to 3) above,
Each of the plurality of second refrigeration devices (50) comprises:
The refrigeration system further includes a two-stage compressor (54A) provided downstream of the second evaporator (53) and upstream of the second condenser (52) of the second refrigeration circuit (51).

According to the configuration of 4) above, when the exhaust heat discharged from the multiple second refrigeration devices (50) is collected and recovered in the first exhaust heat recovery line (3), the pressure ratio required for the compressor (54) of each of the multiple second refrigeration devices (50) is larger than when the exhaust heat discharged from the multiple second refrigeration devices (50) is collected and recovered in the first cold heat recovery circuit (4). By making each compressor (54) of the multiple second refrigeration devices (50) a two-stage compressor (54A), it becomes possible to easily meet the required pressure ratio.

5) In some embodiments, the refrigeration system (1) according to any one of 1) to 4) above,
The first heat medium circulating through the first refrigeration circuit (21) of each of the plurality of first refrigeration devices (20) is made of carbon dioxide.

According to the configuration of 5) above, by using carbon dioxide as the first heat medium, which is the refrigerant of each of the multiple first refrigeration devices (20), each of the multiple first refrigeration devices (20) can be installed either outdoors or indoors, so there is a high degree of freedom in the installation location of each of the multiple first refrigeration devices (20). In addition, by using carbon dioxide as the first heat medium, the maintenance costs of the multiple first refrigeration devices (20) can be reduced compared to when the first heat medium is ammonia or the like.

6) In some embodiments, the refrigeration system (1) according to any one of 2) to 4) above,
The fourth heat medium circulating through the second refrigeration circuit (51) of each of the plurality of second refrigeration devices (50) is made of carbon dioxide.

According to the above configuration 6), by using carbon dioxide as the fourth heat medium, which is the refrigerant of each of the multiple second refrigeration devices (50), each of the multiple second refrigeration devices (50) can be installed either outdoors or indoors, so there is a high degree of freedom in the installation location of each of the multiple second refrigeration devices (50). In addition, by using carbon dioxide as the fourth heat medium, the maintenance costs of the multiple second refrigeration devices (50) can be reduced compared to when the fourth heat medium is ammonia or the like.

7) In some embodiments, the refrigeration system (1) according to any one of 1) to 4) above,
the first heat medium circulating through the first refrigeration circuit (21) of each of the plurality of first refrigeration devices (20) is made of carbon dioxide;
The other refrigeration device (11) includes an ammonia refrigerator (15) that uses ammonia as a refrigerant.

According to the configuration of 7) above, the refrigerants used in each of the multiple first refrigeration devices (20) and the ammonia refrigerator (15) are different, and the refrigerant characteristics, such as COP (coefficient of performance)/temperature curve, are also different. Depending on the load, refrigeration capacity, required temperature range, etc. of the refrigeration system (1), each of the multiple first refrigeration devices (20) and the ammonia refrigerator (15) can be used according to their respective refrigerant characteristics, thereby improving the operating efficiency of the refrigeration system (1).

8) In some embodiments, the refrigeration system (1) according to any one of 2) to 6) above,
The second heat medium and the third heat medium are made of the same type of heat medium,
The first exhaust heat recovery line (3)
a second heat medium introduction line (31) for introducing the second heat medium to the first condenser (22) of each of the plurality of first refrigeration devices (20);
a second heat medium discharge line (32) for discharging the second heat medium from the first condenser (22) of each of the plurality of first refrigeration devices (20);
The first cold energy recovery circuit (4) comprises:
A third heat medium storage tank (41) configured to store the third heat medium;
a third heat medium introduction line (42) for introducing the third heat medium from the third heat medium storage tank (41) to the first evaporator (23) of each of the plurality of first refrigeration devices (20);
a third heat medium return line (43) for returning the third heat medium from the first evaporator (23) of each of the plurality of first refrigeration devices (20) to the third heat medium storage tank (41);
the second exhaust heat recovery line (12) is connected to the third heat medium introduction line (42) via a first introduction line (81), connected to the second heat medium introduction line (31) via a second introduction line (82), connected to the third heat medium return line (43) via a first discharge line (83), and connected to the second heat medium discharge line (32) via a second discharge line (84);
The refrigeration system (1) comprises:
The system further includes a plurality of flow rate control valves (85, 86, 87, 88) configured to be capable of adjusting the flow rate of the heat medium flowing through each of the first inlet line (81), the second inlet line (82), the first discharge line (83), and the second discharge line (84).

According to the configuration of 8) above, by opening and closing the multiple flow rate control valves (85, 86, 87, 88), it is possible to selectively switch between a state in which the exhaust heat discharged from the multiple second refrigeration devices (50) is collectively recovered in the first cold heat recovery circuit (4) and a state in which the exhaust heat is collectively recovered in the first exhaust heat recovery line (3). In this case, it is possible to timely utilize the advantages of a state in which the exhaust heat discharged from the multiple second refrigeration devices (50) is collectively recovered in the first cold heat recovery circuit (4) and a state in which the exhaust heat is collectively recovered in the first exhaust heat recovery line (3).

9) In some embodiments, the refrigeration system (1) according to any one of 1) to 8) above,
The first exhaust heat recovery line (3)
a second heat medium introduction line (31) for introducing the second heat medium to the first condenser (22) of each of the plurality of first refrigeration devices (20);
a second heat medium discharge line (32) for discharging the second heat medium from the first condenser (22) of each of the plurality of first refrigeration devices (20);
The first cold energy recovery circuit (4) comprises:
A third heat medium storage tank (41) configured to store the third heat medium;
a third heat medium introduction line (42) for introducing the third heat medium from the third heat medium storage tank (41) to the first evaporator (23) of each of the plurality of first refrigeration devices (20);
a third heat medium return line (43) for returning the third heat medium from the first evaporator (23) of each of the plurality of first refrigeration devices (20) to the third heat medium storage tank (41);
The refrigeration system (1) comprises:
The heat transfer medium introduction line (42) further includes a plurality of flow control valves (9) configured to be capable of adjusting a flow rate of the heat transfer medium flowing through each of an inlet side branch pipe (312) connected to the first condenser (22) of the second heat transfer medium introduction line (31) and an inlet side branch pipe (422) connected to the first evaporator (23) of the third heat transfer medium introduction line (42).

According to the configuration of 9) above, by closing the multiple flow rate control valves (9), the first refrigeration device (20) can be disconnected from the common first exhaust heat recovery line (3) and the common first cold heat recovery circuit (4). In this case, the pressure loss when the first refrigeration device (20) is in a stopped state can be reduced.

10) In some embodiments, the refrigeration system (1) according to any one of 1) to 9) above,
Each of the plurality of first refrigeration devices (20) further includes an outer frame (26) surrounding the first refrigeration circuit (21), the first condenser (22), and the first evaporator (23),
The plurality of first refrigeration units (20) include two or more first refrigeration units (20) having their outer frames (26) stacked on top of each other.

According to the configuration of 10) above, by arranging two or more first refrigeration units (20) with their outer frames (26) stacked on top of each other, it is possible to reduce the horizontal installation space required for the multiple first refrigeration units (20).

1,01 Refrigeration system 2 First refrigeration device group 3 First exhaust heat recovery line 4 First cold heat recovery circuit 5 Second refrigeration device group 6 Second cold heat recovery circuit 9,10 Flow control valve 11 Other refrigeration device 12 Second exhaust heat recovery line 13 Second exhaust heat heat medium inlet line 14 Second exhaust heat heat medium outlet line 15,15A,15B Ammonia refrigerator 20 First refrigeration device 21 First refrigeration circuit 22 First condenser 23 First evaporator 24 First compressor 25 First expander 26,56 Outer frame 27,57 Controller 28,58 Buffer tank 31 Second heat medium inlet line 32 Second heat medium outlet line 33 Cooling device 33A Exhaust heat recovery device 33B Cooler 34,45 Pump 41 Third heat medium storage tank 42 Third heat medium inlet line 43 Third heat medium return line 44,64 Heat exchanger 50 Second refrigeration device 51 Second refrigeration circuit 52 Second condenser 53 Second evaporator 54 Second compressor 55 Second expander 61 Fifth heat medium storage tank 62 Fifth heat medium inlet line 63 Fifth heat medium return line 81 First inlet line 82 Second inlet line 83 First discharge line 84 Second discharge line 100 General controller 591 Gas-liquid separator 592 Gas flow path 593 Check valve 594 Front-stage expansion devices P1, P2, P3, P4, P5, P6 Connection position

Claims (10)

a first refrigeration circuit for circulating a first heat medium;
a first condenser provided in the first refrigeration circuit and configured to be capable of transferring thermal energy of the first heat medium to a second heat medium; and a first evaporator provided in the first refrigeration circuit and configured to be capable of transferring cold energy of the first heat medium to a third heat medium;
a first exhaust heat recovery line through which the second heat medium flows, the first exhaust heat recovery line being connected to the first condenser of each of the plurality of first refrigeration devices so as to be capable of flowing the second heat medium;
a first refrigeration recovery circuit for circulating the third heat medium, the first refrigeration recovery circuit being connected to the first evaporator of each of the plurality of first refrigeration devices so as to be capable of flowing the third heat medium;
Another refrigeration device different from the plurality of first refrigeration devices;
A second exhaust heat recovery line through which a heat medium for recovering thermal energy from the other refrigeration device flows, the second exhaust heat recovery line being connected to at least one of the first cold heat recovery circuit or the first exhaust heat recovery line so that the heat medium can flow therethrough.
Refrigeration system. The other refrigeration device,
a second refrigeration circuit for circulating a fourth heat medium;
the second refrigeration circuit includes at least a second condenser that is provided in the second refrigeration circuit and configured to be capable of transferring thermal energy of the fourth heat medium to the third heat medium; and a second evaporator that is provided in the second refrigeration circuit and configured to be capable of transferring cold energy of the fourth heat medium to a fifth heat medium,
The second exhaust heat recovery line is connected to the first cold heat recovery circuit and the second condenser of each of the plurality of second refrigeration devices so as to be able to circulate the third heat medium,
The refrigeration system comprises:
The second refrigeration device further includes a second refrigeration recovery circuit for circulating the fifth heat medium, the second refrigeration recovery circuit being connected to the second evaporator of each of the plurality of second refrigeration devices so that the fifth heat medium can flow therethrough.
2. The refrigeration system of claim 1. The other refrigeration device,
a second refrigeration circuit for circulating a fourth heat medium;
the second refrigeration circuit includes at least a second condenser that is provided in the second refrigeration circuit and configured to be capable of transferring thermal energy of the fourth heat medium to the second heat medium; and a second evaporator that is provided in the second refrigeration circuit and configured to be capable of transferring cold energy of the fourth heat medium to a fifth heat medium,
the second exhaust heat recovery line is connected to the first exhaust heat recovery line and the second condenser of each of the plurality of second refrigeration devices so as to be able to circulate the second heat medium;
The refrigeration system comprises:
The second refrigeration device further includes a second refrigeration recovery circuit for circulating the fifth heat medium, the second refrigeration recovery circuit being connected to the second evaporator of each of the plurality of second refrigeration devices so that the fifth heat medium can flow therethrough.
2. The refrigeration system of claim 1. Each of the plurality of second refrigeration devices is
The second refrigeration circuit further includes a two-stage compressor provided downstream of the second evaporator and upstream of the second condenser.
4. The refrigeration system of claim 3. The first heat medium circulating through the first refrigeration circuit of each of the plurality of first refrigeration devices is made of carbon dioxide.
5. A refrigeration system according to any one of claims 1 to 4. The fourth heat medium circulating through the second refrigeration circuit of each of the plurality of second refrigeration devices is made of carbon dioxide.
5. A refrigeration system according to any one of claims 2 to 4. the first heat medium circulating through the first refrigeration circuit of each of the plurality of first refrigeration devices is made of carbon dioxide;
The other refrigeration device includes an ammonia refrigerator that uses ammonia as a refrigerant.
5. A refrigeration system according to any one of claims 1 to 4. The second heat medium and the third heat medium are made of the same type of heat medium,
The first exhaust heat recovery line is
a second heat medium introduction line for introducing the second heat medium to the first condenser of each of the plurality of first refrigeration devices;
a second heat medium discharge line for discharging the second heat medium from the first condenser of each of the plurality of first refrigeration devices;
The first cold energy recovery circuit includes:
a third heat medium storage tank configured to store the third heat medium;
a third heat medium introduction line for introducing the third heat medium from the third heat medium storage tank to the first evaporator of each of the plurality of first refrigeration devices;
a third heat medium return line for returning the third heat medium from the first evaporator of each of the plurality of first refrigeration devices to the third heat medium storage tank;
the second exhaust heat recovery line is connected to the third heat medium introduction line via a first inlet line, connected to the second heat medium introduction line via a second inlet line, connected to the third heat medium return line via a first discharge line, and connected to the second heat medium discharge line via a second discharge line;
The refrigeration system comprises:
The heat transfer medium may be supplied to the first inlet line, the second inlet line, the first outlet line, and the second outlet line through a plurality of flow rate control valves configured to adjust the flow rate of the heat transfer medium flowing through each of the first inlet line, the second inlet line, the first outlet line, and the second outlet line.
3. The refrigeration system of claim 2. The first exhaust heat recovery line is
a second heat medium introduction line for introducing the second heat medium to the first condenser of each of the plurality of first refrigeration devices;
a second heat medium discharge line for discharging the second heat medium from the first condenser of each of the plurality of first refrigeration devices;
The first cold energy recovery circuit includes:
a third heat medium storage tank configured to store the third heat medium;
a third heat medium introduction line for introducing the third heat medium from the third heat medium storage tank to the first evaporator of each of the plurality of first refrigeration devices;
a third heat medium return line for returning the third heat medium from the first evaporator of each of the plurality of first refrigeration devices to the third heat medium storage tank;
The refrigeration system comprises:
The second heat medium introduction line further includes an inlet side branch pipe connected to the first condenser, and the third heat medium introduction line further includes an inlet side branch pipe connected to the first evaporator. The third heat medium introduction line further includes a plurality of flow rate regulating valves configured to regulate a flow rate of the heat medium flowing through the inlet side branch pipe connected to the first evaporator.
5. A refrigeration system according to any one of claims 1 to 4. Each of the plurality of first refrigeration devices further includes an outer frame surrounding the first refrigeration circuit, the first condenser, and the first evaporator,
The plurality of first refrigeration devices include two or more first refrigeration devices in which the outer frames are stacked together,
5. A refrigeration system according to any one of claims 1 to 4.

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