CN114738851A - Integrated water-cooled load distribution system and distribution method thereof - Google Patents

Abstract

The invention relates to the technical field of central air conditioners, and discloses an integrated water-cooled load distribution system and a distribution method thereof. The integrated water-cooled load distribution system disclosed by the invention fully considers the energy consumption loss, so that the integrated water-cooled load distribution system can provide enough load for the load side, the efficiency of the integrated water-cooled load distribution system is improved, and the aim of saving energy is fulfilled.

Description

An integrated water-cooled load distribution system and distribution method thereof

technical field

The invention relates to the technical field of central air conditioners, in particular to an integrated water-cooled load distribution system and a distribution method thereof.

Background technique

With the development of the economy and the continuous updating of technology, the existing air-conditioning system has become very energy-saving in each individual component. The application of frequency conversion technology enables various types of central air-conditioning to be adjusted in real time under partial load conditions. Energy saving is achieved under the premise of cooling capacity. For manufacturing plants, the current mainstream central air conditioners are split-type air conditioners. The refrigeration units, cooling towers, and water pumps are set separately and adjusted separately. Unified output of chilled water, energy-saving technology and load distribution are also achieved by opening the number of cooling towers, pumps and refrigeration units to achieve load and cooling capacity adjustment.

In recent years, some manufacturers have designed an integrated central air-conditioning chiller. The output load range of a single unit can be freely adjusted within 25%-100%. The single unit corresponds to one load side, resulting in surplus and waste of power consumption under partial load conditions. Consider the problem of load regulation and load distribution in different spaces and situations.

SUMMARY OF THE INVENTION

Based on the above, the purpose of the present invention is to provide an integrated water-cooled load distribution system and a distribution method thereof, which can solve the surplus and waste of power consumption caused by the existing single machine corresponding to one load side, and the total flow rate of chilled water changes when the total flow of chilled water changes. Under the premise of the premise, it can be allocated to at least two integrated chillers according to the proportion, and under the premise of ensuring the optimal early stage of each integrated chiller, sufficient cooling load can be provided to achieve energy saving.

For achieving the above object, the present invention adopts the following technical solutions:

An integrated water-cooled load distribution system, comprising a control module and at least two parallel integrated chillers, each of the integrated chillers includes a refrigeration component, a refrigeration cycle component and a cooling cycle component, and the refrigeration component includes a compression The chilled water in the refrigeration cycle assembly can exchange heat with the refrigerant in the evaporator, and the cooling water in the cooling cycle assembly can exchange heat with the refrigerant in the condenser. Refrigerant heat exchange, the flow rate of chilled water output by the refrigeration cycle component corresponding to each integrated chiller can be continuously changed, and the control module can determine the actual load required by the load side. The flow rate of the chilled water output by the refrigeration cycle component of the integrated chiller, and the actual load includes a theoretical load and a heat loss load.

As a preferred solution of the integrated water-cooled load distribution system, each of the refrigeration cycle components includes a chilled water pump and a first proportional control valve, and the chilled water pump can pump the chilled water to the evaporator to exchange heat with the refrigerant, so The first proportional control valve can continuously adjust the flow rate of the cooled chilled water flowing out of the evaporator.

As a preferred solution of the integrated water-cooled load distribution system, the integrated water-cooled load distribution system further includes a refrigerating cycle pipe and a water tank, and the refrigerating cycle pipe is provided with the refrigerated water pump and the first proportional control valve. The water tank is communicated with the refrigeration cycle pipe.

As a preferred solution of the integrated water-cooled load distribution system, the refrigerated circulation pipe includes at least one refrigerated return pipe, and the at least one refrigerated return pipe is in one-to-one correspondence with at least one load end on the load side. The water pipes are all communicated with the outlet of the load end, and each of the refrigerated return pipes is provided with a second proportional control valve, which can continuously adjust the heat-absorbing chilled water flowing out from the load end. traffic.

As a preferred solution of the integrated water-cooled load distribution system, the integrated water-cooled load distribution system further includes a circulation return water main pipe, and the heat-absorbing chilled water flowing out from each load end flows to the circulation return water main pipe , the refrigeration cycle assembly further includes a return water flow sensor and a return water pressure sensor, and the return water flow sensor and the return water pressure sensor are both arranged on the circulating return water main pipe.

As a preferred solution of the integrated water-cooled load distribution system, the integrated water-cooled load distribution system further includes a circulating water outlet header, and the chilled water cooled in each of the evaporators flows to the circulating water outlet header, and the chilled water outlet The circulation assembly further includes a water outlet flow sensor and a water outlet pressure sensor, and the outlet water flow sensor and the outlet water pressure sensor are both arranged on the circulating water outlet main pipe.

As a preferred solution of the integrated water-cooled load distribution system, the integrated water-cooled load distribution system further includes a bypass valve, the bypass valve is connected to the circulating water outlet main pipe and the circulating water return main pipe, and the bypass valve is connected by It is configured to open when the difference between the outlet water pressure detected by the outlet water pressure sensor and the return water pressure detected by the return water pressure sensor is greater than the preset water pressure.

As a preferred solution of the integrated water-cooled load distribution system, the cooling circulation assembly includes a cooling water pump and a cooling circulation pipe, the integrated water-cooled load distribution system further includes a cooling water tower, and the cooling water pump is arranged on the cooling circulation pipe and The cooling water in the cooling circulation pipe can be pumped into the condenser for heat absorption, and the cooling water after heat absorption can be returned to the cooling water tower for cooling.

As a preferred solution of the integrated water-cooled load distribution system, the cooling cycle assembly further includes a first fan, and the air outlet of the first fan is disposed facing the cooling water tower to cool the cooling water in the cooling water tower. .

A distribution method applicable to the integrated water-cooled load distribution system described in any of the above schemes, comprising:

Calculate the actual load required on the load side according to the theoretical load on the load side and considering the heat loss load;

Calculate the total output load of at least two of the integrated chillers according to the output load of each of the integrated chillers;

The control module determines the flow rate of chilled water output by the refrigeration cycle assembly of each of the integrated chillers according to the total output load.

The beneficial effects of the present invention are: in the integrated water-cooled load distribution system disclosed in the present invention, the flow rate of the chilled water output by the refrigeration cycle components corresponding to each integrated chiller can be continuously changed, and the control module can be based on the actual load on the load side. Determine the flow rate of chilled water output by the refrigeration cycle components of each integrated chiller. The actual load includes the theoretical load and the heat loss load, and the energy loss is fully considered, so that the integrated water-cooled load distribution system can provide the load side. The sufficient load improves the efficiency of the integrated water-cooled load distribution system and achieves the purpose of energy saving.

The distribution method of the integrated water-cooled load distribution system disclosed by the invention improves the efficiency of the integrated water-cooled load distribution system under the premise of considering energy consumption, and achieves the purpose of energy saving.

Description of drawings

In order to illustrate the technical solutions in the embodiments of the present invention more clearly, the following briefly introduces the accompanying drawings that need to be used in the description of the embodiments of the present invention. Obviously, the drawings in the following description are only some embodiments of the present invention. , for those of ordinary skill in the art, other drawings can also be obtained according to the contents of the embodiments of the present invention and these drawings without creative efforts.

1 is a schematic diagram of an integrated water-cooled load distribution system provided by a specific embodiment of the present invention;

2 is a schematic diagram of partial structures of a refrigeration assembly, a refrigeration cycle assembly and a cooling cycle assembly of an integrated water-cooled load distribution system provided by a specific embodiment of the present invention.

In the picture:

1. Integrated chiller; 11. Compressor; 12. Condenser; 13. Expansion valve; 14. Evaporator; 15. Chilled water pump; 16. First proportional control valve; 17. Cooling water pump; 18. Cooling circulation pipe ;

2. Water tank;

31. Freezing return pipe; 32. Second proportional control valve;

41. Main pipe of circulating water; 42. Main pipe of circulating water;

5. Cooling water tower;

100. Load end.

Detailed ways

In order to make the technical problems solved by the present invention, the technical solutions adopted and the technical effects achieved more clearly, the technical solutions of the embodiments of the present invention will be described in further detail below with reference to the accompanying drawings. Obviously, the described embodiments are only the present invention. Some examples, but not all examples. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative efforts shall fall within the protection scope of the present invention.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. The indicated orientation or positional relationship is based on the orientation or positional relationship shown in the accompanying drawings, which is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the indicated device or element must have a specific orientation or a specific orientation. construction and operation, and therefore should not be construed as limiting the invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed to indicate or imply relative importance. Therein, the terms "first position" and "second position" are two different positions.

In the description of the present invention, it should be noted that the terms "installed", "connected" and "connected" should be understood in a broad sense, unless otherwise expressly specified and limited, for example, it may be a fixed connection or a detachable connection Connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the internal communication of two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood in specific situations.

This embodiment provides an integrated water-cooled load distribution system, as shown in FIG. 1 and FIG. 2 , including a control module and at least two parallel integrated chillers 1 , each integrated chiller 1 Circulation component and cooling cycle component. The refrigeration component includes a compressor 11, a condenser 12, an expansion valve 13 and an evaporator 14. The compressor 11 is a screw compressor, and the chilled water in the refrigeration cycle component can be mixed with the evaporator 14. Refrigerant heat exchange, the cooling water in the cooling cycle assembly can exchange heat with the refrigerant in the condenser 12, and the flow rate of the chilled water output by the refrigeration cycle assembly corresponding to each integrated chiller 1 can be continuously changed, the control module The flow rate of chilled water output by the refrigeration cycle components of each integrated chiller 1 can be determined according to the actual load required on the load side, and the actual load includes theoretical load and heat loss load.

In the integrated water-cooled load distribution system provided in this embodiment, the flow rate of the chilled water output by the refrigeration cycle components corresponding to each integrated chiller 1 can be continuously changed, and the control module can determine each integrated chiller according to the actual load on the load side. The flow rate of the chilled water output by the refrigeration cycle component of the chiller 1, where the actual load includes the theoretical load and the heat loss load, and the energy loss is fully considered, so that the integrated water-cooled load distribution system can provide sufficient load for the load side, The efficiency of the integrated water-cooled load distribution system is improved, and the purpose of energy saving is achieved.

Specifically, as shown in Figures 1 and 2, each refrigeration cycle assembly includes a chilled water pump 15 and a first proportional control valve 16, the chilled water pump 15 has a frequency conversion function, and the chilled water pump 15 is controlled by an integrated water-cooled load distribution system according to an external The frequency conversion data given by the command implements frequency conversion to control the output of the chilled water. The chilled water pump 15 can pump the chilled water to the evaporator 14 to exchange heat with the refrigerant, so that the temperature of the chilled water is lowered in the evaporator 14. The first proportional control valve 16 can continuously adjust the flow rate of the cooled chilled water flowing out from the evaporator 14, so that the load of each integrated chiller 1 can be continuously changed.

As shown in FIG. 1 , the integrated water-cooled load distribution system of this embodiment further includes a refrigerating cycle pipe and a water tank 2 . The refrigerating cycle pipe is provided with a refrigerated water pump 15 and a first proportional regulating valve 16 , and the water tank 2 communicates with the refrigerating cycle pipe. The chilled water cooled in the evaporator 14 can flow to the load side for heat absorption, so that the temperature of the load side is maintained within the specified temperature range, and the chilled water after heat absorption can flow to the water tank 2 for preliminary heat dissipation, so that the chilled water The temperature is initially lowered. The additional water tank 2 can not only ensure the flow of chilled water when the load side needs more cooling capacity, but also store excess chilled water when the load side needs less cooling capacity to ensure the normal operation of the system. Specifically, the temperature of the cooled chilled water flowing out from the evaporator 14 is between 7°C and 12°C.

As shown in FIG. 1 , the refrigerating cycle pipe of this embodiment includes at least one refrigerated water return pipe 31 , and the at least one refrigerated water return pipe 31 corresponds to at least one load end 100 on the load side in a one-to-one correspondence, that is, the refrigerated water pipe and the load end 100 are in a one-to-one relationship Correspondingly, each refrigerated return pipe 31 is communicated with the outlet of the load end 100. As shown in FIG. 1, each refrigerated return pipe 31 is provided with a second proportional control valve 32, and the second proportional control valve 32 can continuously adjust from The flow rate of the endothermic chilled water flowing out of the load end 100 . Specifically, each load end 100 on the load side is connected to a refrigerated return pipe 31, so that the chilled water heated up at the load end 100 can be returned to the evaporator 14 of the integrated chiller 1 to be cooled again, thereby realizing the circulation of chilled water flow. It should be noted that the number of the integrated chillers 1 in this embodiment is not necessarily the same as the number of load ends 100 on the load side, and is calculated according to the actual maximum load of each integrated chiller 1 .

As shown in FIG. 1 , the integrated water-cooled load distribution system of this embodiment further includes a circulating water return main pipe 41 and a circulating water outlet main pipe 42, and the heat-absorbing chilled water flowing out from each load end 100 flows to the circulating water return main pipe 41. The refrigeration cycle assembly further includes a return water flow sensor (not shown in the figure) and a return water pressure sensor (not shown in the figure). The return water flow sensor is used to detect the flow rate of the chilled water in the circulating return water main pipe 41, and the return water pressure sensor is used to detect the return water pressure of the chilled water in the circulating return water main pipe 41. The chilled water flows to the circulating water outlet main pipe 42, and the refrigeration cycle assembly also includes a water outlet flow sensor (not shown in the figure) and an outlet water pressure sensor (not shown in the figure). 42 , the water outlet flow sensor is used to detect the flow rate of the chilled water in the circulating water outlet main pipe 42 , and the outlet water pressure sensor is used to detect the outlet pressure of the chilled water in the circulating water outlet main pipe 42 . It should be noted that the solid line in FIG. 1 of this embodiment represents the pipeline through which chilled water with a lower temperature flows from the integrated chiller 1 to the load end 100 , and the dashed line in FIG. 1 represents the chilled water with a higher temperature after absorbing heat. The water flows from the load end 100 back to the integrated water chiller 1 for re-cooling.

Specifically, the chilled water cooled by each integrated chiller 1 can be aggregated into the circulating water outlet pipe 42, and the opening of the second proportional valve 16 is adjusted according to the load required by each load end 100, thereby adjusting the refrigeration The total return water volume of the water outlet main pipe 42 of the water circulation, and then the amount of chilled water distributed to each load end 100 also changes accordingly. The flow rate of the chilled water in the integrated chiller 1 will change, so that the chilled water flowing into the circulating water outlet main pipe 42 will change, and the chilled water heated up in each load end 100 can flow back to the circulating return water main pipe 41, Thereby, it flows back to each integrated chiller unit 1 to realize the circulating flow of chilled water. It should be noted that if part of the integrated chiller 1 is turned on, the chilled water flowing out through the circulating return water main pipe 41 can be returned to the turned on integrated chiller 1 , so that the chilled water is cooled in the evaporator 14 .

Further, the integrated water-cooled load distribution system of this embodiment further includes a bypass valve (not shown in the figure), the bypass valve communicates with the circulating water outlet header 42 and the circulating water return header 41, and the bypass valve is configured as a water outlet pressure sensor Open when the difference between the detected water outlet pressure and the return water pressure detected by the return water pressure sensor is greater than the preset water pressure. The additional bypass valve can make the chilled water flow smoothly in the integrated water-cooled load distribution system, and ensure that the pressure difference between the chilled water entering the load side and the chilled water flowing out of the load side will not be too large, thereby avoiding the circulation of the water outlet header 42 and the flow. The pipe burst phenomenon caused by the large pressure difference of the chilled water in the circulating return water main pipe 41 ensures the safety of the integrated water-cooled load distribution system.

As shown in FIG. 2 , the cooling circulation assembly of this embodiment includes a cooling water pump 17 and a cooling circulation pipe 18 , the cooling water pump 17 is a power frequency water pump, and the integrated water-cooled load distribution system also includes a cooling water tower 5 , and the cooling water tower 5 is a cross-flow type. Cooling tower, the water flow of the cross-flow cooling tower falls vertically from the upper part of the tower, the air flows in the horizontal direction and passes through the water flow, and the air flow is orthogonal to the water flow. The cooling water is pumped into the condenser 12 for heat absorption, and the cooling water after heat absorption can be returned to the cooling water tower 5 for cooling. The integrated water-cooled load distribution system of this embodiment further includes a first fan (not shown in the figure), and the air outlet of the first fan is disposed facing the cooling water tower 5 to cool the cooling water in the cooling water tower 5 . The number of the first fans is four, and the four first fans can be turned on or off according to external signals.

The integrated water-cooled load distribution system of this embodiment further includes an accommodating box and a second fan (not shown in the figure). The above-mentioned components such as the refrigeration assembly, the chilled water pump 15, and the cooling water pump 17 are all placed in the accommodating box, and the accommodating box is rectangular. In addition, it has anti-corrosion performance. Under the requirement of ventilation inside the container, the internal temperature of the container is controlled below 50°C, and the heat is dissipated by the second fan.

For example, the theoretical load required on the load side is 260KW, considering the heat load loss of 2%, the output load of a single integrated chiller 1 is 100KW, then the actual load required on the load side is calculated as 260+260*2%= 265.2KW, it can be seen that two integrated chillers 1 need to be opened, the opening degree of the first proportional valve of the third integrated chiller 1 is 65.2%, and the corresponding output load of the third integrated chiller 1 is 65.2KW.

The control modules in this embodiment are respectively electrically connected to the first proportional control valve 16 , the integrated chiller 1 , the second proportional control valve 32 , the bypass valve, etc. Preferably, the control modules of this embodiment may be centralized or distributed. For example, the controller can be a single single-chip microcomputer, or it can be composed of a plurality of distributed single-chip microcomputers. The single-chip microcomputer can run the control program, and then control the first proportional control valve 16, the integrated chiller 1, the second The proportional control valve 32 and the bypass valve fulfill their functions.

This embodiment also provides a distribution method suitable for the integrated water-cooled load distribution system described in the above technical solution, including:

Calculate the actual load on the load side according to the theoretical load on the load side and considering the heat loss load;

Calculate the total output load of at least two integrated chillers 1 according to the output load of each integrated chiller 1;

The control module determines the flow rate of chilled water output by the refrigeration cycle components of each integrated chiller 1 according to the total output load.

Wherein, the control module can distribute the calculated load to each integrated chiller 1, and satisfy the cooling demand of each load end 100 on the load side under the condition of the optimal overall COP.

The distribution method of the integrated water-cooled load distribution system provided in this embodiment improves the efficiency of the integrated water-cooled load distribution system under the premise of considering energy consumption, and achieves the purpose of energy saving.

Note that the above are only preferred embodiments of the present invention and applied technical principles. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described herein, and various obvious changes, readjustments and substitutions can be made by those skilled in the art without departing from the protection scope of the present invention. Therefore, although the present invention has been described in detail through the above embodiments, the present invention is not limited to the above embodiments, and can also include more other equivalent embodiments without departing from the concept of the present invention. The scope is determined by the scope of the appended claims.

Claims (10)

1. An integrated water-cooled load distribution system is characterized by comprising a control module and at least two integrated water chilling units (1) which are connected in parallel, wherein each integrated water chilling unit (1) comprises a refrigerating assembly, a refrigerating circulation assembly and a cooling circulation assembly, the refrigerating assembly comprises a compressor (11), a condenser (12), an expansion valve (13) and an evaporator (14), refrigerating water in the refrigerating circulation assembly can exchange heat with a refrigerant in the evaporator (14), cooling water in the cooling circulation assembly can exchange heat with the refrigerant in the condenser (12), the flow of the refrigerating water output by the refrigerating circulation assembly corresponding to each integrated water chilling unit (1) can be continuously changed, the control module can determine the flow of the refrigerating water output by the refrigerating circulation assembly of each integrated water chilling unit (1) according to the actual load required by a load side, the actual load includes a theoretical load and a heat loss load.

2. The integrated water-cooled load distribution system according to claim 1, wherein each of the freezing cycle assemblies comprises a freezing water pump (15) and a first proportional regulating valve (16), the freezing water pump (15) is capable of pumping the freezing water to the evaporator (14) to exchange heat with the refrigerant, and the first proportional regulating valve (16) is capable of continuously regulating the flow rate of the cooled freezing water flowing out of the evaporator (14).

3. The integrated water-cooled load distribution system according to claim 2, further comprising a freezing circulation pipe on which the freezing water pump (15) and the first proportional regulating valve (16) are disposed, and a water tank (2), the water tank (2) being in communication with the freezing circulation pipe.

4. The integrated water-cooled load distribution system according to claim 3, wherein the freezing and circulating pipe comprises at least one freezing and water-returning pipe (31), the at least one freezing and water-returning pipe (31) corresponds to the at least one load end (100) on the load side one by one, each freezing and water-returning pipe (31) is communicated with an outlet of the load end (100), each freezing and water-returning pipe (31) is provided with a second proportional regulating valve (32), and the second proportional regulating valve (32) can continuously regulate the flow of the heat-absorbed freezing water flowing out from the load end (100).

5. The integrated water-cooled load distribution system according to claim 4, further comprising a circulating water return header (41), wherein the heat-absorbed chilled water flowing out of each of the load ends (100) flows to the circulating water return header (41), and the refrigeration cycle assembly further comprises a water return flow sensor and a water return pressure sensor, and the water return flow sensor and the water return pressure sensor are both disposed on the circulating water return header (41).

6. The integrated water-cooled load distribution system according to claim 5, further comprising a circulating water outlet header pipe (42), wherein the chilled water cooled in each evaporator (14) flows to the circulating water outlet header pipe (42), the refrigeration cycle assembly further comprises a water outlet flow sensor and a water outlet pressure sensor, and the water outlet flow sensor and the water outlet pressure sensor are both disposed on the circulating water outlet header pipe (42).

7. The integrated water-cooled load distribution system according to claim 6, further comprising a bypass valve communicating the circulating outlet water header (42) and the circulating return water header (41), the bypass valve being configured to open when a difference between an outlet water pressure detected by the outlet water pressure sensor and a return water pressure detected by the return water pressure sensor is greater than a preset water pressure.

8. The integrated water-cooled load distribution system according to claim 1, wherein the cooling circulation assembly comprises a cooling water pump (17) and a cooling circulation pipe (18), the integrated water-cooled load distribution system further comprises a cooling water tower (5), the cooling water pump (17) is disposed on the cooling circulation pipe (18) and is capable of pumping cooling water in the cooling circulation pipe (18) into the condenser (12) for absorbing heat, and the cooling water after absorbing heat can be returned to the cooling water tower (5) for cooling.

9. The integrated water-cooled load distribution system according to claim 8, further comprising a first fan, wherein an air outlet of the first fan is disposed opposite to the cooling tower (5) to cool the cooling water in the cooling tower (5).

10. A distribution method applied to the integrated water-cooled load distribution system according to any one of claims 1 to 9, comprising:

calculating the actual load required by the load side according to the theoretical load of the load side and considering the heat loss load;

calculating the total output load of at least two integrated water chilling units (1) according to the output load of each integrated water chilling unit (1);

and the control module determines the flow of the chilled water output by the refrigeration cycle component of each integrated water chilling unit (1) according to the total output load.

Images