JPH0668402B2 - Heat source system using in-pipe ice making unit - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of use] The present invention relates to an in-pipe ice making unit that arranges a plurality of thin tubes in a shell and fills the tubes with stored heat water to generate sherbet-like ice. The heat source system using.

[Prior Art] The ice heat storage system is advantageous in that it can be configured compactly because it has a smaller heat storage volume than the water heat storage system. Moreover, if the ice becomes a large lump, the transportability is poor. Therefore, in the ice heat storage system, sherbet-like ice having fluidity and good transportability is produced.

As an ice heat storage system for making ice in a pipe and transporting the ice to a heat storage water tank to store the ice, there are conventional thin film falling ice making systems, rotary ice making systems, ice making systems utilizing supercooling phenomenon of water, and the like.

FIG. 9 is a view showing a conventional example of a thin film descending type ice making system,
FIG. 10 is a diagram showing a conventional example of an ice making system utilizing the supercooling phenomenon of water. In the figure, 61 is a freezer, 62 is a freezer head, 63 is a circulating fluid receiver, 64 is a circulating fluid inlet,
65 is a circulating liquid outlet, 66 is a refrigerant outlet, 67 is a refrigerant inlet, 68 is a tube, 71 is a refrigerator, 72 is a brine cooler, 73 is a supercooler, 74 is a filter, 75 is a heat storage tank, and 76 is a secondary side. Shows the system.

The thin-film descending ice making system was developed by CBI, Inc. in the United States and uses a vertical shell-and-tube heat exchanger as an ice making machine as shown in FIG. The shell portion is provided with a tube 68 inside, and is composed of a full-filled direct expansion type freezer 61 using a refrigerant, which sends the refrigerant from a cooling inlet 67 and draws the refrigerant gas from a refrigerant outlet 66. The inner surface of the tube 68 is mirror-finished, and when the ethylene glycol aqueous solution of the heat storage water is sent from the ice heat storage tank through the circulating liquid inlet 64 to the freezer head 62, the ethylene glycol aqueous solution overflows from the tube 68 and becomes the mirror-finished inner surface. It is designed to fall along. Therefore, the ethylene glycol aqueous solution is cooled by heat exchange with the refrigerant during this period, and only the water molecules in the brine are frozen to form fine ice crystals and become liquid ice, which is the circulating liquid receiver 63 under the freezer 61. To fall. The fallen ice is transferred to the ice heat storage tank to store heat.

Rotary ice making system from Sunwell Engineerin of Canada
It was developed by Company g and swirls an ethylene glycol aqueous solution of heat storage water in an ice-making pipe inside a jacket which is a direct expansion evaporator. By doing so, the pressure of the icing pipe surface in the outer peripheral portion is increased, and liquid ice is generated in the central portion where the pressure is low by utilizing the supercooling phenomenon.

In addition, the ice making system utilizing the supercooling phenomenon of water is
As shown in the figure, for example, a filter 74 is provided, and heat storage water is cleaned to maintain an unstable supercooling phenomenon.
In order to maintain a stable cooling temperature, consideration is given to indirect cooling using brine, pressurization in pipes and high water speed.

As conventionally known, as described above, a sherbet-like ice is manufactured by a refrigerator at the time of heat storage by utilizing the characteristics of the ethylene glycol aqueous solution, and this is stored in a heat storage water tank, and this heat storage cold heat is stored at the time of use. Is used as a cooling heat source to radiate heat through a heat exchanger.

[Problems to be Solved by the Invention]

However, as mentioned above, in the conventional ice making system,
In order to solve the problems caused by icing on the icing surface, the freezing temperature is lowered using ethylene glycol aqueous solution which is industrial waste, a lot of auxiliary machine power is used, and in the case of utilizing the supercooling phenomenon, In order to maintain the supercooling phenomenon, a large amount of energy and cost are invested in indirect cooling and heat storage water transfer, which lowers the efficiency of the entire system. Thus, conventional systems are generally inefficient and have low ice making temperatures.

Furthermore, if the ethylene glycol aqueous solution has a low concentration of 10% or less, it will be difficult to use it as a heat storage material for heating because it causes mold within 30 ° C. When it is applied to a heat pump, it stores heat in winter. It was necessary to discontinue, replace the ethylene glycol aqueous solution with water, or provide a heat storage water tank exclusively for heat use separately from that for cooling. Moreover,
Since the ethylene glycol aqueous solution is designated as industrial waste, it is generally used indirectly through a heat exchanger.To use it directly as circulating water in an open-type heating tower as a heat medium, There is a problem that it is difficult to prevent water scattering and leakage.

Further, in the heating tower system, the concentration of water in the air is reduced by being taken into the circulating water. Therefore, in order to increase the concentration of the antifreeze liquid in this circulating water, stop the heat pump and operate the heating tower and pump on a day with low humidity and fine weather to naturally evaporate and concentrate.
It is necessary to heat a portion of the circulating water to evaporate the water to concentrate it, but usually, a concentration method other than the concentration by natural evaporation, that is, a concentration by a heating method is required, so the system is complicated. However, there is also a problem that the efficiency is poor and the efficiency of the entire system is reduced.

The present invention is to solve the above problems, and an object of the present invention is to provide a heat source system using an in-pipe ice making unit that has good ice making efficiency, can make ice at a relatively high temperature, and can perform deicing at low temperature. Is.

[Means for Solving the Problems]

Therefore, the present invention is to arrange a plurality of thin tubes in the shell, a plurality of in-pipe ice making units capable of generating sherbet-like ice by cooling the tubes with a refrigerant filled with heat storage water A refrigerant circulation system that selectively circulates a low temperature refrigerant and a room temperature refrigerant in each of the in-pipe ice making unit having a compressor and a pump, a refrigerator connected to the refrigerant circulation system and having a compressor, a condenser and an evaporator, and an in-pipe ice making unit. Each has a heat storage water circulation system that selectively circulates heat storage water,
It is characterized in that a low-concentration bromide aqueous solution is used as the heat storage water, and the heat storage water and the refrigerant are circulated by sequentially changing the timing for each in-pipe ice making unit. In addition, by using a low concentration bromide aqueous solution as the circulating water for the heating tower and arranging multiple thin tubes in the shell, the circulating water is used as heat storage water to fill the tube and cool the tube with a refrigerant. Equipped with an in-pipe ice making unit capable of producing sherbet-like ice, the in-pipe ice making unit cools the tube at a temperature according to the concentration degree of the circulating water to make ice and remove the ice to concentrate the circulating water. It is characterized by being configured.

[Action]

In the heat source system using the in-pipe ice making unit of the present invention,
By using a low-concentration aqueous bromide solution, which has strong penetrating power (hydration) and freezing point depression properties depending on the concentration, as the heat storage water, the bromide released with the formation of ice penetrates and the concentration increases. As a result, the freezing point is lowered and sherbet-like ice can be generated in the bromide aqueous solution which is not frozen. Moreover, the low-concentration bromide aqueous solution is -1 ° C.
Since the front and rear are freezing points, the antifreeze liquid or the refrigerant can be used at a high temperature of about -5 ° C, which is higher than that of the conventional one.
Further, since ice making is performed in a stationary, full-filled state, no water-flowing power is required during ice making, and consumption of auxiliary power can be reduced.

〔Example〕

 Hereinafter, embodiments will be described with reference to the drawings.

FIG. 1 is a diagram showing a configuration of an embodiment of an in-pipe ice making unit according to the present invention, FIG. 2 is a sectional view of the ice making unit shown in FIG. 1, and FIG. 3 is a diagram for explaining an ice making mode and a dehydration mode. Is. In the figure, 1 is a shell, 2 is a tube, 3 is a heat storage water outlet, 4 is a heat storage water inlet, 5 is an antifreeze liquid or a refrigerant outlet, 6
Is an antifreeze or refrigerant inlet, 7 is an antifreeze or a refrigerant chamber, 8 is a heat insulating material, and 9 is sherbet-like ice.

The in-pipe ice making unit according to the present invention uses a shell & tube type ice making machine in which a plurality of thin tubes (coils) 2 are contained in a shell 1 as shown in FIG.
As the heat storage material, a low-concentration aqueous solution of bromide such as lithium bromide (LiBr) is used. Then, the bromide aqueous solution is fed into the tube 2 of the shell 1 from the bromide aqueous solution inlet 4 and the antifreeze solution or the refrigerant is fed to the periphery of the tube 2 from the antifreeze liquid or the refrigerant inlet 6, respectively, to cool the tube 2, and the bromide aqueous solution is stopped. Then, sherbet-like ice is generated in the tube 2. Then, the generated sherbet-like ice is one that allows the aqueous bromide solution to pass through the aqueous bromide solution inlet 4 and to push it out through the aqueous bromide solution outlet 3. FIG. 2 shows the cross-sectional view of the shell 1
A plurality of thin tubes 2 which communicate with the bromide aqueous solution inlet 4 and the bromide aqueous solution outlet 3 on both sides are provided in the central part of the, and the periphery of both ends of the tubes 2 is partitioned by an insulating material 8 to form an antifreezing liquid or a refrigerant chamber 7. The refrigerant inlet 6 communicates with the antifreeze or the refrigerant outlet 5.

Next, operations in the ice making mode and the deicing mode will be described with reference to FIG.

In the ice making mode, an aqueous bromide solution as heat storage water is made to stand still in the shell 1 in a full state, and an antifreeze solution or an antifreeze solution of about -5 ° C from the refrigerant inlet 6 or a refrigerant whose evaporation temperature is set to about -5 ° C is used. The tube 2 is cooled by passing it through the refrigerant chamber 7 for about 5 to 10 minutes. Then, a part of the water content of the aqueous bromide solution in the tube 2 is frozen, and sherbet-shaped ice 9 is produced as shown in FIG. 3 (a).

As described above, the present inventor uses a low concentration bromide aqueous solution such as lithium bromide (LiBr) as the heat storage water without using the conventional ethylene glycol aqueous solution or the supercooling phenomenon, and the temperature is relatively high. Moreover, it has been found that the sherbet-shaped ice 9 can be easily generated. That is, bromides such as lithium bromide have a high hydration property (strong penetration into water).
In addition, the low-concentration bromide aqueous solution is characterized in that it has the property of lowering the freezing point as the concentration increases (freezing point lowering phenomenon). Therefore, when the low-concentration bromide aqueous solution, which is heat-storage water, is cooled in a stationary state and ice begins to crystallize, lithium bromide and the like are released. Since it uniformly penetrates into the remaining bromide aqueous solution without being solidified, the concentration of the remaining bromide aqueous solution increases,
The freezing point drops as the concentration changes. for that reason,
Even if the freezing surface temperature becomes slightly lower than −5 ° C., the aqueous bromide solution remains in the tube 2 at a concentration that follows it, so that a solid ice plate is not formed on the freezing surface in the tube. It was found that fine sherbet-like ice was generated in the entire tube 2. Moreover, since the freezing point temperature of a low concentration bromide aqueous solution of several percent (for example, 2 to 3%) is around -1 ° C, it is possible to efficiently make ice at a relatively high temperature.

When sherbet-like ice is generated as described above,
Next, the deicing mode is switched to, and sherbet-shaped ice is taken out from the tube 2. In this de-icing mode, first use antifreeze or a refrigerant for less than 1 minute (tens of seconds).
In a short time, the freezing surface temperature is brought close to the freezing point temperature of the low-concentration bromide aqueous solution (for example, about 0% with a 2-3% bromide aqueous solution).
(C)) to remove the sherbet-shaped ice 9 adhering to the freezing tube surface with a slight ice adhesion force (FIG. 3 (b)). Then, a low-concentration bromide aqueous solution is pumped from the heat storage water tank with a pump or the like for several tens of seconds, and the bromide aqueous solution containing sherbet-like ice 9 is blown from the tube 2 into the bromide aqueous solution as shown in FIG. 3 (c). It is pushed out to the heat storage water tank through the outlet 3, and the inside of the tube 2 is replaced with fresh bromide aqueous solution.

FIG. 4 is a diagram showing a configuration of one embodiment of a refrigerant system of an ice making system using an in-pipe ice making unit, and FIG. 5 is a diagram showing a configuration of one embodiment of a water system. In the figure, 11 and 15 are compressors, 12
Is a condenser, 13 is an evaporator, 14 is a suction header, 16 is a suction damper, 17 is a suction branch pipe, 18 is a refrigerant switching valve, 19 is a refrigerant spray nozzle, 20 is an ice making tube, 21 is a refrigerant branch pipe, 22 is an evaporator block, 23 Is an orifice, 24 is a low-pressure refrigerant liquid tank, 25 is a refrigerant pump, 26 is a refrigerant main pipe, 27 is a refrigerant flow rate control valve, and 28 is a heat storage water switching valve.

The embodiment shown in FIG. 4 and FIG. 5 is a system in which the general-purpose refrigerator unit and the ice making unit according to the present invention are integrated, and the ice making unit is configured by using a plurality of in-pipe ice making units. It is a thing. In the figure, four evaporator blocks
22 respectively correspond to the ice making unit shown in FIG. The refrigerant liquid switching valve 18 switches the supply system of the refrigerant liquid to the condenser 12 or the low pressure refrigerant liquid tank 24 depending on whether the evaporator block 22 is in the ice making mode or the dehydration mode. The supply of heat storage water is stopped in the ice making mode to make the heat storage water in the ice making tube 20 of the evaporator block 22 in a stationary state, and the heat storage water is supplied at the time of de-ice to remove the sherbet-like ice generated in the ice making tube 20. It pushes out and replaces the heat storage water.

First, during the ice making operation, the compressor 11 of the refrigerator unit,
The high-pressure room-temperature refrigerant liquid pressurized and condensed by the condenser 12 is guided to the ice making section through the refrigerant flow rate control valve 27, and is sprayed from the refrigerant spray nozzle 19 of the evaporator block 22 during deicing. This refrigerant liquid accumulates in the lower low-pressure refrigerant liquid tank 24 through the orifice 23, from the refrigerant pump 25 to the refrigerant main pipe 26,
It is sprayed from the refrigerant spray nozzle 19 of the evaporator block 22 during ice making through the refrigerant liquid switching valve 18. The low-temperature low-pressure refrigerant gas evaporated inside and outside -5 ° C in the evaporator block 22 is sucked by the compressor 15 of the ice making machine unit,
It is pressurized and returns to the evaporator 13 of the refrigerator unit, and a refrigerant circulation cycle is formed.

As described above, at the time of ice making, since the refrigerant is supplied from the ice making machine section to the evaporator 13 of the refrigerator section as a refrigerant gas, there is an advantage that the water in the evaporator 13 of the refrigerator section is not frozen. Therefore, the cold water operation in the daytime can be smoothly switched from the heat storage operation.

Further, the heat storage water is pumped up from a heat storage water tank such as an underfloor by a heat storage water pump, and is sequentially sent to an evaporator block 22 during deicing of the ice making machine part through a control valve such as the heat storage water switching valve 28, and a part of sherbet shape. The ice is sequentially returned from each evaporator block 22 to the heat storage water tank, and ice is stored in the heat storage water tank.

In the ice making system shown in FIG. 3 and FIG. 4, the evaporator blocks 22 are continuously operated by sequentially controlling the opening / closing of the refrigerant switching valve 18 and the heat storage water switching valve 28 so as to sequentially repeat the ice making mode → the deicing mode. Can be used to make ice. By doing this, the heat storage water to each evaporator block 22 is stopped for each block during ice making, the ice made in the pipe is carried out, and water is passed for only tens of seconds in the latter half of the de-ice to replace the heat storage water. Since the heat storage water switching valve 28 is switched as described above, the heat storage water transfer power can be significantly reduced as compared with the conventional ice making machine.

In FIG. 4, the evaporator block 22 at the left end of the figure
Shows the state of de-icing mode. In this de-icing mode, with the suction damper 16 closed and the suction branch pipe 17 closed, by spraying the refrigerant from the refrigerant spray nozzle 19 into the evaporator block 22 through the refrigerant switching valve 18, the ice making tube 20 is maintained at a low temperature. To heat. Then, by opening the heat storage water switching valve 28, the sherbet-like ice generated in the ice making tube 20 by the heat storage water is pushed out to replace the heat storage water.

According to the above ice making system, in the cold water operation in the daytime when heat storage is not required, by operating only the refrigerator 11 side, the secondary side cold water of the closed system connected to the evaporator 13 of the refrigerator 11 side is reduced to about 5%. It can be cooled directly to ° C.

Further, in the heat storage water cooling operation in the summer, the two-step cooling can be performed separately for general cooling up to about 5 ° C and low temperature cooling up to about 0 ° C. In both cases, both compressors 11 and 15 are operated in series, and the heat storage water is sent to all of the evaporator blocks 22 of the ice-making unit divided into blocks.

In winter, when operating as a heat pump machine, it is possible to significantly improve heat storage efficiency by low-temperature heat storage and use low-temperature building waste heat.

In the morning operation with a large heating load, if the heat storage water is heated at midnight by another heat source device or the like and is, for example, 15 ° C. or higher, the heat storage water is caused to flow through the evaporator block 22 of the refrigerator unit to cool the refrigerator unit. By operating only the compressor 11 of the above, it is possible to efficiently take out heat from the condenser 12.

Further, when collecting heat from the cold heat storage water after the heating is started, the heat can be taken out from the condenser 12 more efficiently than the air heat source type heat pump machine by operating in the same manner as the low temperature cold water in summer or the ice making operation.

When the stored water drops to near 0 ° C, waste heat from buildings such as sewage, heat from the atmosphere, waste heat from indoor air conditioning, etc. can be recovered, and high heat efficiency can be secured even in winter. In addition, because of the low temperature heat storage, the heat insulation of the heat storage water tank, the season switching of air conditioning and heating, etc. are more advantageous than the conventional cold and hot water heat storage method.

As described above, the use of the ice making system of the present invention directly cools the secondary side cold water that is closed during the daytime general cold water operation, and smoothes some important operation patterns as other heating and cooling heat source machines. You can switch and operate efficiently.

FIG. 6 is a view showing an example in which the ice making unit according to the present invention is used to concentrate the circulating water of the heating tower. In the heating tower 32, the circulating water comes into direct contact with the outside air,
It is diluted by taking in water in the air. In order to concentrate such circulating water, the ice making unit of the present invention described above can be used as the concentrating device 31. This concentrating device 31 uses an ice making and de-iceing cycle, and changes the temperature of ice making and de-icing according to the degree of concentration to freeze the water mixed in the heat pump operation in a sherbet form. Then, this ice can be concentrated to a desired concentration by, for example, removing it by scooping.

FIG. 7 is a diagram showing the configuration of one embodiment of the heat source system, and FIG. 8 is a diagram showing another embodiment.

In the figure, reference numeral 41 is a heat pump refrigerator, which is provided with a refrigeration cycle including a known compressor, a heating / cooling switching valve, a heat source side heat exchanger, an expansion valve, and a use side heat exchanger. Reference numeral 42 denotes an ice making unit, between the heat exchanger forming the ice making unit and the heat source side heat exchanger of the heat pump refrigerator 1, a brine is circulated by a circulation pump 43 so that brine can be circulated. Reference numeral 44 denotes a heat storage tank, which is arranged so that the water storage pump 46 sprays the heat storage material 46 in the heat storage tank 44 onto the heat exchangers constituting the ice making unit 42. As the heat storage material 46, an aqueous bromide solution diluted to several percent is used.

The aqueous bromide solution is, for example, a bromide compounded with a light metal such as lithium bromide or magnesium bromide, and is an aqueous bromide solution which can be obtained from an aqueous solution at 0 ° C. or lower to obtain decahydrate. It is also possible to circulate the refrigerant of the heat pump refrigerator 41 directly in the heat exchanger of the ice making unit 42 and use this heat exchanger as an evaporator. In that case, the circulation pump 43 becomes unnecessary.

The operation of the cooling / heating heat source water system configured as described above during cooling / heating will be described.

At the time of cooling, as shown in FIG.
Water is sprinkled by a water sprinkling pump 45 into a heat exchanger that constitutes the ice making unit 42, and heat is exchanged with the brine or the refrigerant cooled by the heat pump refrigerator 41, and the bromide aqueous solution 46 is cooled and returned to the heat storage tank 44. By repeating this process, sherbet-like ice is generated in the circulating aqueous solution or on the freezing surface of the ice making unit 42, and the sherpet-like ice 47 is stored in the heat storage tank 44 by directly flowing down or separating from the freezing surface. Let As a result, latent heat storage of water is achieved, and a large amount of cold heat is stored in the heat storage tank 44. Then, at the time of heat radiation, the stored cold heat is supplied to the air conditioner 52 via the heat exchanger 51 by the secondary pumps 50 and 53 as a cooling heat source. It is also possible to directly feed water to the air conditioner 52 without going through the heat exchanger 51.

At the time of heating, as shown in FIG. 2B, the bromide aqueous solution 46 is directly or indirectly heated in the ice making section 42 switched to the condenser or the heat exchanger for heating by the heat of the heat pump type refrigerator 41 during heat storage. Alternatively, the bromide aqueous solution 46 in the heat storage tank 44 is circulated to the heat exchanger 47 by the circulation pump 49,
Here, building waste heat and atmospheric heat are absorbed and stored. Then, at the time of heat radiation, the stored low-temperature heat is sent as a heating heat source to the ice making unit 42 switched to the evaporator by the water spray pump 45 or the heat exchanger for heat collection, and directly to the refrigerant of the heat pump refrigerator 41. Alternatively, heat is indirectly transferred via brine.

FIG. 8 shows another embodiment of the heat source system,
The bromide aqueous solution 46 is circulated by the circulation pump 54 so that heat can be exchanged with the evaporator side heat exchanger of the heat pump refrigerator 41 or the indirect heat exchanger via the brine, and the cooling heat storage is carried out in the same manner as in the above embodiment. At times, sharpet-shaped ice 47 is directly stored in the heat storage tank 44.

In the above example, the bromide aqueous solution is used as the heat source of the heat pump refrigerator 41, but other than this, since it has almost no toxicity and is not designated as industrial waste, it has a low temperature as described above. It may be used as antifreeze circulating water of an open type heating tower that collects sensible heat from the atmosphere.

In addition, heat storage water is sprinkled on the freezing plate to freeze the ice to the set thickness, and each time, the hot gas of the refrigerant or the heated brine is automatically switched to flow into the freezing plate for a short period of time, and the freezing plate is heated to repeatedly remove the ice. In a so-called harvest-type ice heat storage system that accumulates ice, by mixing a small amount of bromide with the heat storage water, ice can be sharpened without significantly impairing the freezing temperature. This is because if the concentration of bromide is as low as a few percent, it is relatively easy to freeze the ice without lowering the temperature. Therefore, it is possible to shorten the deicing time, remarkably reduce the deicing failure, and improve the fluidity of ice in the heat storage tank or the pipe.

Furthermore, since the amount of ice in the heat storage tank and the concentration of the aqueous bromide solution are linked under a fixed condition, it is easy to measure the amount of ice for each short time by controlling the concentration, and as a result, even in the harvest type ice heat storage system, It is possible to obtain an inexpensive and reliable optimum operation system of the heating and cooling heat source system according to the building heating and cooling load.

〔The invention's effect〕

As is clear from the above description, according to the present invention, by using a low concentration aqueous solution of bromide such as lithium bromide as a heat storage material, sherbet-like ice can be produced at about -5 ° C. , It is possible to make ice at a relatively high temperature, and because the freezing point depression and the high hydration characteristics of the aqueous bromide solution do not result in a hard ice mass even after a long time, so when ordinary water is frozen It does not lead to such a blocked state in the tube. In addition, by heating at a low temperature of about 0 ° C, smooth deicing from the freezing surface can be performed in a short time, and low temperature deicing close to 0 ° C can be performed. The precooling heat of the normal temperature refrigerant liquid can be used, the operation efficiency can be improved, and the entire refrigeration system can be simplified.

Also, since a low concentration aqueous bromide solution is used for the heat storage water,
Compared with a conventional ice making system that uses heat storage water other than water, such as an aqueous solution of ethylene glycol, as the heat storage water, since it is not toxic and has a small amount of contamination, it is highly safe and maintenance can be improved and cost can be reduced. Moreover, because of the low concentration,
Since the freezing temperature is as high as -1 ° C and the direct refrigerant expansion method can be used, the refrigerator evaporation temperature that affects the ice making efficiency and capacity can be increased by about 5 ° C compared to the conventional one.
The efficiency and efficiency during ice making can be improved.

In particular, by integrating with a general-purpose refrigerator, the efficiency of sherbet-like ice generation can be increased, and various operations can be efficiently performed during heat storage and non-heat storage such as summer and winter operations, and operation modes can be easily switched. You can do it. Also, in winter, by operating as a heat pump machine, the latent heat of the heat storage water can be utilized, the capacity of the heat storage water tank and heat insulation can be reduced, and a low temperature heat storage system with high overall efficiency can be adopted.

In addition, almost no auxiliary power is required, and since it is ice-making in a non-flowing water pipe, no power is required other than the water flow time for ice removal,
Since the water flow time is as short as 1/10 or less of the total operating time,
The amount of power used can be reduced to 1/5 to 1/10 or less compared to the conventional one.

Even when used as a concentrating device for circulating water in a heating tower, compared to the conventional method of utilizing latent heat of vaporization, the heat of coagulation of water is used, so about 1/7 unless a heat recovery heat exchanger is provided. Can reduce the amount of energy used. In addition, the mechanism can be simplified compared to the use of latent heat of vaporization, and the system as a whole can have a simple structure.

[Brief description of drawings]

FIG. 1 is a diagram showing a configuration of an embodiment of an in-pipe ice making unit according to the present invention, FIG. 2 is a sectional view of the ice making unit shown in FIG. 1, and FIG. 3 is a view for explaining an ice making mode and an ice removing mode. Fig. 4 is a diagram showing the configuration of one embodiment of a refrigerant system of an ice making system using an in-pipe ice making unit, Fig. 5 is a diagram showing the configuration of one embodiment of a water system, and Fig. 6 is circulating water of a heating tower. The figure which shows the example which uses the ice making unit which concerns on this invention for concentration, FIG. 7 is a figure which shows the structure of one Example of a heat source system, FIG. 8 is a figure which shows the structure of other Examples, and FIG. FIG. 10 is a diagram showing a conventional example of a conventional ice making system, and FIG. 10 is a diagram showing a conventional example of an ice making system utilizing the supercooling phenomenon of water. 11 and 15 …… Compressor, 12 …… Condenser, 13…
… Evaporator, 14 …… Suction header, 16 ……
Suction damper, 17 ... Suction branch, 18 ... Refrigerant switching valve, 19 ... Refrigerant spray nozzle, 20 ... Ice making tube, 21 ... Refrigerant branch, 22 ... Evaporator block, 23 ... Orifice, 24 ... Low pressure Refrigerant liquid tank, 25 …… Refrigerant pump, 26 …… Refrigerant main pipe, 27 …… Refrigerant flow control valve, 28
...... Heat storage water switching valve.

Claims (2)

[Claims] 1. Arranging a plurality of thin tubes in a shell,
Multiple pipe ice-making units that are capable of producing sherbet-like ice by cooling the tube with refrigerant by filling the tube with the stored heat-filled water, a compressor and a pump, and a low-temperature refrigerant and room temperature in each pipe ice-making unit. A refrigerant circulation system that selectively circulates the refrigerant, a refrigerator that is connected to the refrigerant circulation system and that has a compressor, a condenser, and an evaporator, and a heat storage water circulation system that selectively circulates the heat storage water in each of the in-pipe ice making units. A heat source system using an in-pipe ice making unit, characterized in that a low-concentration bromide aqueous solution is used as water, and the in-pipe ice making unit is configured to circulate heat storage water and a refrigerant by sequentially switching the timing and changing the timing. 2. A low concentration bromide aqueous solution is used as the circulating water for the heating tower, and a plurality of thin tubes are arranged in the shell. The circulating water is used as heat storage water so that the tubes are filled with liquid and the tubes are cooled with a refrigerant. It is equipped with an in-pipe ice making unit that can generate sherbet-like ice by cooling, and the circulating ice is concentrated by removing the ice by cooling the tube at a temperature according to the concentration degree of circulating water by the in-pipe ice making unit. A heat source system using an in-pipe ice making unit, which is configured as described above.