Refrigeration system

Abstract

The utility model discloses a refrigeration system which is used for flexibly configuring refrigeration terminals of machine rooms and avoiding large-scale downtime of a plurality of data center machine rooms caused by single-point faults of the refrigeration terminals. The refrigeration system comprises a cooling water tower and a plurality of machine room refrigeration tail ends, and the cooling water tower is connected with the machine room refrigeration tail ends and used for providing cooling water for a first cooling system and a second cooling system in the machine room refrigeration tail ends. The machine room refrigeration terminal further comprises a liquid cooling system, a liquid return pipeline of the liquid cooling system is connected with a liquid supply pipeline of the liquid cooling system through the first cooling system and / or the second cooling system, and the first cooling system and the second cooling system are used for exchanging heat with a cooling medium in the liquid cooling system.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of refrigeration, in particular to a refrigeration system. BACKGROUND

[0002] With the continuous development of artificial intelligence technology, there is an increasing demand for high-heat-density data center rooms, and currently, liquid cooling technology is usually used to ensure the reliable operation of data center rooms.

[0003] A conventional liquid cooling system for a data center room usually adopts a large-capacity centralized refrigeration terminal. This approach not only has a complex pipeline system and control system, but also has many fault risk points and a large fault domain. Once a single-point fault occurs in the refrigeration terminal, it may cause large-scale downtime of multiple data center rooms. CONTENT OF THE UTILITY MODEL

[0004] The present application provides a refrigeration system and a control method thereof, which are used to flexibly configure a refrigeration terminal for a data center room and avoid large-scale downtime of multiple data center rooms caused by a single-point fault of the refrigeration terminal.

[0005] In a first aspect, the embodiments of the present application provide a refrigeration system, which comprises a cooling water tower and a plurality of refrigeration terminals for data center rooms, wherein

[0006] The cooling water tower is connected to the plurality of refrigeration terminals for data center rooms, respectively, and is used to provide cooling water to a first cooling system and a second cooling system in the plurality of refrigeration terminals for data center rooms.

[0007] The refrigeration terminal for a data center room further comprises a liquid cooling system, a liquid return pipeline of the liquid cooling system is connected to a liquid supply pipeline of the liquid cooling system through the first cooling system and / or the second cooling system, and the first cooling system and the second cooling system are used to exchange heat with a cooling medium in the liquid cooling system.

[0008] In the above system, the refrigeration system comprises a cooling water tower and a plurality of refrigeration terminals for data center rooms, the cooling water tower provides cooling water to the plurality of refrigeration terminals for data center rooms, and the plurality of refrigeration terminals for data center rooms can be respectively deployed in multiple data center rooms. Compared with the large-capacity centralized refrigeration terminal in the prior art, the plurality of refrigeration terminals for data center rooms can be flexibly deployed in each data center room, and the plurality of refrigeration terminals for data center rooms do not affect each other. Even if a fault occurs in a refrigeration terminal for a data center room, it does not affect the operation of other refrigeration terminals for data center rooms, thereby avoiding large-scale downtime of multiple data center rooms caused by a single-point fault of the refrigeration terminal.

[0009] In a possible implementation, the first cooling system comprises a pre-cooling plate heat exchanger, and the second cooling system comprises a double-channel condenser, a double-channel evaporator, and one or two cooling subsystems connected between the double-channel condenser and the double-channel evaporator.

[0010] In a possible implementation, the double-pass condenser comprises any one of a double-pass plate heat exchanger condenser or a double-pass shell and tube condenser, and the double-pass evaporator comprises any one of a double-pass plate heat exchanger evaporator or a double-pass shell and tube evaporator.

[0011] In a possible implementation, the water supply port of the cooling water tower is connected to the primary side inlet of the pre-cooling plate heat exchanger, the primary side outlet of the pre-cooling plate heat exchanger is connected to the primary side inlet of the double-pass condenser, and the primary side outlet of the double-pass condenser is connected to the water return port of the cooling water tower through a first control valve.

[0012] The liquid return pipeline of the liquid cooling system is connected to the secondary side inlet of the pre-cooling plate heat exchanger, the secondary side outlet of the pre-cooling plate heat exchanger is connected to the primary side inlet of the double-pass evaporator, and the primary side outlet of the double-pass evaporator is connected to the liquid supply pipeline of the liquid cooling system through a second control valve.

[0013] In a possible implementation, the water supply port of the cooling water tower is connected to the primary side inlet of the pre-cooling plate heat exchanger and the primary side inlet of the double-pass condenser respectively, a third control valve is connected between the water supply port of the cooling water tower and the primary side inlet of the double-pass condenser, the primary side outlet of the pre-cooling plate heat exchanger is connected to the primary side inlet of the double-pass condenser through a fourth control valve, and the primary side outlet of the double-pass condenser is connected to the water return port of the cooling water tower.

[0014] The liquid return pipeline of the liquid cooling system is connected to the secondary side inlet of the pre-cooling plate heat exchanger and the primary side inlet of the double-pass evaporator respectively, a fifth control valve is connected between the liquid return pipeline of the liquid cooling system and the primary side inlet of the double-pass evaporator, the secondary side outlet of the pre-cooling plate heat exchanger is connected to the primary side inlet of the double-pass evaporator through a sixth control valve, and the primary side outlet of the double-pass evaporator is connected to the liquid supply pipeline of the liquid cooling system.

[0015] In a possible implementation, the water supply port of the cooling water tower is connected to the primary side inlet of the pre-cooling plate heat exchanger and the primary side inlet of the double-channel condenser respectively, a seventh control valve is connected between the water supply port of the cooling water tower and the primary side inlet of the double-channel condenser, the primary side outlet of the pre-cooling plate heat exchanger is connected to the primary side inlet of the double-channel condenser and the water return port of the cooling water tower respectively, an eighth control valve is connected between the primary side outlet of the pre-cooling plate heat exchanger and the primary side inlet of the double-channel condenser, the ninth control valve is connected between the primary side outlet of the pre-cooling plate heat exchanger and the water return port of the cooling water tower, and the primary side outlet of the double-channel condenser is connected to the water return port of the cooling water tower through a tenth control valve.

[0016] The liquid return pipeline of the liquid cooling system is connected to the secondary side inlet of the pre-cooling plate heat exchanger and the primary side inlet of the double-channel evaporator respectively, an eleventh control valve is connected between the liquid return pipeline of the liquid cooling system and the primary side inlet of the double-channel evaporator, the secondary side outlet of the pre-cooling plate heat exchanger is connected to the primary side inlet of the double-channel evaporator and the liquid supply pipeline of the liquid cooling system respectively, a twelfth control valve is connected between the pre-cooling plate heat exchanger and the primary side inlet of the double-channel evaporator, the thirteenth control valve is connected between the pre-cooling plate heat exchanger and the liquid supply pipeline of the liquid cooling system, and the primary side outlet of the double-channel evaporator is connected to the liquid supply pipeline of the liquid cooling system through a fourteenth control valve.

[0017] In a possible implementation, the cooling subsystem comprises a compressor and an electronic expansion valve, one end of the compressor and one end of the electronic expansion valve are connected to two ends of one channel of the double-channel evaporator respectively, the other end of the compressor and the other end of the electronic expansion valve are connected to two ends of one channel of the double-channel condenser respectively.

[0018] In a possible implementation, the computer room refrigeration terminal further comprises a cold water coil connected in series between the liquid return pipeline and the liquid supply pipeline of the liquid cooling system.

[0019] In the above system, by arranging the cold water coil, cold air can be provided to the computer room of the data center while the computer room of the data center is cooled by the liquid cooling system, and the cold water coil is integrated with the computer room refrigeration terminal, thereby reducing the occupation of the area of the computer room.

[0020] In a possible implementation, the computer room refrigeration terminal further comprises at least one fan arranged on one side of the cold water coil.

[0021] In the above system, by arranging the fan, the heat exchange speed between the cold water coil and the computer room of the data center can be improved.

[0022] In a possible implementation, the machine room refrigeration terminal further comprises a circulating pump arranged in the liquid supply pipeline of the liquid cooling system.

[0023] In a second aspect, the embodiments of the present application provide a control method of a refrigeration system, applied to the refrigeration system provided in the first aspect of the embodiments of the present application, and the method comprises:

[0024] obtaining the temperature of the cooling water provided by the cooling water tower and the return liquid temperature of the return liquid pipeline of the liquid cooling system;

[0025] controlling the first cooling system and / or the second cooling system to exchange heat with the cooling medium in the liquid cooling system based on the temperature of the cooling water and the return liquid temperature.

[0026] In the above method, according to the temperature of the cooling water provided by the cooling water tower and the expected return liquid temperature of the return liquid pipeline of the liquid cooling system, the first cooling system and / or the second cooling system can be flexibly controlled to exchange heat with the cooling medium in the liquid cooling system, so as to ensure the return liquid temperature of the return liquid pipeline of the liquid cooling system. BRIEF DESCRIPTION OF DRAWINGS

[0027] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed in the embodiment description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0028] Figure 1 a structural schematic diagram of the refrigeration system provided in the embodiments of the present application;

[0029] Figure 2 a structural schematic diagram of the machine room refrigeration terminal provided in the embodiments of the present application;

[0030] Figure 3 a structural schematic diagram of another machine room refrigeration terminal provided in the embodiments of the present application;

[0031] Figure 4 a structural schematic diagram of still another machine room refrigeration terminal provided in the embodiments of the present application;

[0032] Figure 5 a structural schematic diagram of still another machine room refrigeration terminal provided in the embodiments of the present application;

[0033] Figure 6 a structural schematic diagram of still another machine room refrigeration terminal provided in the embodiments of the present application;

[0034] Figure 7Another structure schematic diagram of a machine room refrigeration terminal provided by an embodiment of the present application is shown in the figure.

[0035] Figure 8 A schematic flow chart of a control method of a refrigeration system provided by an embodiment of the present application is shown in the figure. DETAILED DESCRIPTION

[0036] In order to make the purposes, technical solutions and advantages of the present application clearer, the present application will be further described in detail below with reference to the accompanying drawings. Obviously, the described embodiments are only some of the embodiments of the present application, but not all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the scope of protection of the present application.

[0037] In the description of the embodiments of the present application, unless otherwise specified, " / " represents the meaning of or, for example, A / B can represent A or B; "and / or" in the text only describes the association relationship of the associated objects, which means that there can be three relationships, for example, A and / or B, which means that there are three cases of A alone, A and B together, and B alone. In addition, in the description of the embodiments of the present application, "multiple" means two or more than two.

[0038] Hereinafter, the terms "first" and "second" are only used for descriptive purposes, and cannot be understood as implying or suggesting relative importance or implicitly indicating the number of indicated technical features. Therefore, the features defined with "first", "second" can explicitly or implicitly include one or more of the features.

[0039] Before introducing the refrigeration system provided by the embodiments of the present application, in order to facilitate understanding, first, the technical background of the embodiments of the present application is introduced in detail.

[0040] With the continuous development of artificial intelligence technology, the demand for high heat density data center machine rooms is increasing, and currently liquid cooling technology is usually used to ensure the reliable operation of data center machine rooms.

[0041] The traditional data center machine room liquid cooling system usually adopts large cooling capacity centralized refrigeration terminal. This kind of way not only has complex pipeline system and control system, but also has more fault risk points and larger fault domain. Once a single point fault occurs in the refrigeration terminal, it may cause large-scale downtime of multiple data center machine rooms.

[0042] In view of this, the embodiment of the present application provides a refrigeration system, which comprises a cooling water tower and a plurality of machine room refrigeration terminals. The cooling water tower provides cooling water for the plurality of machine room refrigeration terminals. The plurality of machine room refrigeration terminals can be respectively arranged in a plurality of data center machine rooms. The plurality of machine room refrigeration terminals do not affect each other. Even if a machine room refrigeration terminal fails, the operation of other machine room refrigeration terminals is not affected, thereby avoiding large-scale downtime of a plurality of data center machine rooms caused by single-point failure of a refrigeration terminal.

[0043] After introducing the background of the embodiment of the present application, the refrigeration system and the control scheme thereof provided by the embodiment of the present application will be described in detail in combination with specific embodiments.

[0044] Referring to Figure 1 As shown in the figure, it is a structure schematic diagram of a refrigeration system in the embodiment of the present application. The refrigeration system comprises a cooling water tower 10 and a plurality of machine room refrigeration terminals 11.

[0045] The cooling water tower 10 is connected with the plurality of machine room refrigeration terminals 11 respectively, and is used to provide cooling water for a first cooling system 111 and a second cooling system 112 in the plurality of machine room refrigeration terminals 11.

[0046] The machine room refrigeration terminal 11 further comprises a liquid cooling system 110. A return liquid pipeline of the liquid cooling system 110 is connected with a liquid supply pipeline of the liquid cooling system 110 through the first cooling system 111 and / or the second cooling system 112. The first cooling system 111 and the second cooling system 112 are used to exchange heat with a cooling medium in the liquid cooling system 110.

[0047] In the refrigeration system provided by the embodiment of the present application, the plurality of machine room refrigeration terminals 11 can be respectively arranged in a plurality of data center machine rooms. The plurality of machine room refrigeration terminals 11 do not affect each other. Even if a machine room refrigeration terminal 11 fails, the operation of other machine room refrigeration terminals 11 is not affected, thereby avoiding large-scale downtime of a plurality of data center machine rooms caused by single-point failure of a refrigeration terminal.

[0048] In specific implementation, the first cooling system comprises a pre-cooling plate heat exchanger. The second cooling system comprises a double-channel condenser, a double-channel evaporator, and one or two cooling subsystems connected between the double-channel condenser and the double-channel evaporator. The double-channel condenser comprises any one of a double-channel plate heat exchanger or a double-channel shell-and-tube condenser. The double-channel evaporator comprises any one of a double-channel plate heat exchanger or a double-channel shell-and-tube evaporator.

[0049] It should be noted that the cooling subsystem includes a compressor and an electronic expansion valve. One end of the compressor and one end of the electronic expansion valve are connected to the two ends of one channel of the dual-channel evaporator, respectively. The other end of the compressor and the other end of the electronic expansion valve are connected to the two ends of one channel of the dual-channel condenser, respectively. In this way, the refrigerant (or cooling medium) flows between one channel of the dual-channel condenser, one channel of the dual-channel evaporator, the compressor, and the electronic expansion valve, forming the cooling subsystem.

[0050] In practical applications, the internal connection structure of the computer room cooling terminal 11 can be implemented in a variety of different ways. The following describes each of these implementations in conjunction with specific examples.

[0051] Implementation Method 1

[0052] like Figure 2 As shown, Figure 2 A schematic diagram of a cooling terminal 11 in a computer room is shown. The water supply port 20 of the cooling tower is connected to the primary side inlet of the precooling plate heat exchanger 21. The primary side outlet of the precooling plate heat exchanger 21 is connected to the primary side inlet of the dual-channel condenser 22. The primary side outlet of the dual-channel condenser 22 is connected to the return port 24 of the cooling tower through the first control valve 23.

[0053] The return line 25 of the liquid cooling system is connected to the secondary inlet of the precooling plate heat exchanger 21. The secondary outlet of the precooling plate heat exchanger 21 is connected to the primary inlet of the dual-channel evaporator 26. The primary outlet of the dual-channel evaporator 26 is connected to the liquid supply line 28 of the liquid cooling system through the second control valve 27.

[0054] Implementation Method 2

[0055] like Figure 3 As shown, Figure 3 Another structural schematic diagram of the cooling terminal 11 in the computer room is shown. The water supply port 30 of the cooling tower is connected to the primary side inlet of the precooling plate heat exchanger 31 and the primary side inlet of the dual-channel condenser 32. A third control valve 33 is connected between the water supply port 30 of the cooling tower and the primary side inlet of the dual-channel condenser 32. The primary side outlet of the precooling plate heat exchanger 31 is connected to the primary side inlet of the dual-channel condenser 32 through a fourth control valve 34. The primary side outlet of the dual-channel condenser 32 is connected to the return port 35 of the cooling tower.

[0056] The return liquid pipeline 36 of the liquid cooling system is connected with the secondary side inlet of the pre-cooling plate heat exchanger 31 and the primary side inlet of the double-channel evaporator 37 respectively, the fifth control valve 38 is connected between the return liquid pipeline 36 of the liquid cooling system and the primary side inlet of the double-channel evaporator 37, the secondary side outlet of the pre-cooling plate heat exchanger 31 is connected with the primary side inlet of the double-channel evaporator 37 through the sixth control valve 39, and the primary side outlet of the double-channel evaporator 37 is connected with the liquid supply pipeline 310 of the liquid cooling system.

[0057] Embodiment three

[0058] As shown in Figure 4 , Figure 4 Another structural schematic diagram of the machine room refrigeration terminal 11 is shown, the water supply port 40 of the cooling water tower is connected with the primary side inlet of the pre-cooling plate heat exchanger 41 and the primary side inlet of the double-channel condenser 42 respectively, the seventh control valve 43 is connected between the water supply port 40 of the cooling water tower and the primary side inlet of the double-channel condenser 42, the primary side outlet of the pre-cooling plate heat exchanger 41 is connected with the primary side inlet of the double-channel condenser 42 and the return water port 44 of the cooling water tower respectively, the eighth control valve 45 is connected between the primary side outlet of the pre-cooling plate heat exchanger 41 and the primary side inlet of the double-channel condenser 42, the eighth control valve 45 and the ninth control valve 46 are connected between the primary side outlet of the pre-cooling plate heat exchanger 41 and the return water port 44 of the cooling water tower, and the primary side outlet of the double-channel condenser 42 is connected with the return water port 44 of the cooling water tower through the tenth control valve 47.

[0059] The return liquid pipeline 48 of the liquid cooling system is connected with the secondary side inlet of the pre-cooling plate heat exchanger 41 and the primary side inlet of the double-channel evaporator 49 respectively, the eleventh control valve 410 is connected between the return liquid pipeline 48 of the liquid cooling system and the primary side inlet of the double-channel evaporator 49, the secondary side outlet of the pre-cooling plate heat exchanger 41 is connected with the primary side inlet of the double-channel evaporator 49 and the liquid supply pipeline 411 of the liquid cooling system respectively, the twelfth control valve 412 is connected between the pre-cooling plate heat exchanger 41 and the primary side inlet of the double-channel evaporator 49, the twelfth control valve 412 and the thirteenth control valve 413 are connected between the pre-cooling plate heat exchanger 41 and the liquid supply pipeline 411 of the liquid cooling system, and the primary side outlet of the double-channel evaporator 49 is connected with the liquid supply pipeline 411 of the liquid cooling system through the fourteenth control valve 414.

[0060] In the machine room refrigeration terminal provided by the embodiment of the present application, the cold distribution unit is not arranged, the cold distribution of the refrigeration terminal can be adjusted by adjusting the control valves, and the structure of the machine room refrigeration terminal is simplified.

[0061] In actual application, the machine room refrigeration terminal provided by the embodiment of the present application further comprises a cold water coil connected in series between the return liquid pipeline and the liquid supply pipeline of the liquid cooling system and the fifteenth control valve.

[0062] By setting the cold water coil, the cold air can be provided to the data center room while the data center room is cooled by the liquid cooling system, and the cold water coil is integrated with the data center room cooling terminal to reduce the occupation of the data center room area.

[0063] In specific implementation, the data center room cooling terminal can further include at least one fan arranged at one side of the cold water coil. By arranging the fan, the heat exchange speed between the cold water coil and the data center room can be improved.

[0064] In some embodiments, the data center room cooling terminal can further include a circulating pump arranged in the liquid supply pipeline of the liquid cooling system to improve the flow speed of the cooling medium in the liquid cooling system.

[0065] Specifically, the structure of the data center room cooling terminal shown in Figures 5-7 is briefly described below. Figures 2-4 The cold water coil, at least one fan, and the circulating pump are added to the structure of the data center room cooling terminal shown in

[0066] As shown in Figure 5 , it is a structure schematic diagram of the data center room cooling terminal structure shown in Figure 2 . The cold water coil 50 is connected in series with the fifteenth control valve 51 between the liquid return pipeline 25 and the liquid supply pipeline 28 of the liquid cooling system. At least one fan 52 is arranged at one side of the cold water coil 50. The circulating pump 53 is arranged in the liquid supply pipeline 28 of the liquid cooling system.

[0067] As shown in Figure 6 , it is a structure schematic diagram of the data center room cooling terminal structure shown in Figure 3 . The cold water coil 60 is connected in series with the fifteenth control valve 61 between the liquid return pipeline 36 and the liquid supply pipeline 310 of the liquid cooling system. At least one fan 62 is arranged at one side of the cold water coil 60. The circulating pump 63 is arranged in the liquid supply pipeline 310 of the liquid cooling system.

[0068] As shown in Figure 7 , it is a structure schematic diagram of the data center room cooling terminal structure shown in Figure 4 . The cold water coil 70 is connected in series with the fifteenth control valve 71 between the liquid return pipeline 48 and the liquid supply pipeline 411 of the liquid cooling system. At least one fan 72 is arranged at one side of the cold water coil 70. The circulating pump 73 is arranged in the liquid supply pipeline 411 of the liquid cooling system.

[0069] The following is an embodiment of the data center room cooling terminal shown in Figure 7The control of each control valve in the data center refrigeration terminal provided by the embodiment of the application is briefly described by taking the data center terminal structure shown as an example, and other structures have the same principle and will not be described again.

[0070] In actual application, each control valve in the data center refrigeration terminal is controlled according to the cooling water temperature provided by the cooling tower and the liquid return temperature of the liquid cooling system, and specifically includes the following cases.

[0071] Case 1: When the cooling water temperature is low, the second cooling system does not need to be started, and the cooling medium in the liquid cooling system is exchanged with the first cooling system.

[0072] In this case, the control valve 410 and the control valve 414 are closed, the control valve 413 is always open, the cooling medium in the liquid return pipeline of the liquid cooling system is exchanged with the first cooling system (the pre-cooling plate heat exchanger 41), the required cooling medium flow is maintained through the automatic adjusting control valve 412, and the temperature of the cooling medium is adjusted through the automatic adjusting control valve 45.

[0073] The hot return air of the data center passes through the cold water coil, and the cold air temperature supplied to the data center is adjusted through the automatic adjusting control valve 71.

[0074] The control valve 45 and the control valve 46 are opened, and the control valve 43 and the control valve 47 are closed, the cooling water provided by the cooling tower passes through the pre-cooling plate heat exchanger and is directly returned to the cooling tower.

[0075] Case 2: When the cooling water temperature gradually increases, and the first cooling system alone cannot provide the cooling medium temperature meeting the set requirement, one cooling subsystem in the second cooling system needs to participate in heat exchange, and the cooling medium in the liquid cooling system is exchanged with one cooling subsystem in the first cooling system and the second cooling system.

[0076] In this case, the control valve 410 and the control valve 413 are closed, the control valve 412 is always open, the cooling medium in the liquid return pipeline of the liquid cooling system is first exchanged with the first cooling system (the pre-cooling plate heat exchanger), and then exchanged with the second cooling system (the double-channel evaporator). The required cooling medium flow is maintained through the automatic adjusting control valve 414, and the temperature of the provided cooling medium is adjusted through the automatic adjusting of one opened cooling subsystem (the compressor) in the second cooling system.

[0077] The hot return air of the data center passes through the cold water coil, and the cold air temperature supplied to the data center is adjusted through the automatic adjusting control valve 71.

[0078] The control valve 43 and the control valve 46 are closed, the control valve 45 and the control valve 47 are opened, the cooling water provided by the cooling tower passes through the pre-cooling plate heat exchanger, then passes through the double-channel condenser, and finally returns to the cooling tower.

[0079] Case 3, when the cooling water temperature is high, and the cooling medium temperature cannot be satisfied by one cooling subsystem in the first cooling system and the second cooling system, the two cooling subsystems in the second cooling system need to participate in heat exchange at the same time, at this time, the cooling medium in the liquid cooling system exchanges heat with the two cooling subsystems in the first cooling system and the second cooling system.

[0080] In this case, the control valve 410 and the control valve 413 are closed, the control valve 412 is always open, the cooling medium in the liquid return pipeline of the liquid cooling system first exchanges heat with the first cooling system (pre-cooling plate heat exchanger), and then exchanges heat with the second cooling system (double-channel evaporator). The required cooling medium flow is maintained by the automatic adjusting control valve 414, and the temperature of the cooling medium provided is adjusted by the automatic adjustment of the two cooling subsystems (compressors) in the second cooling system.

[0081] The hot return air of the machine room passes through the cold water coil, and the cold air temperature supplied to the machine room is adjusted by the automatic adjusting control valve 71.

[0082] The control valve 43 and the control valve 46 are closed, the control valve 45 and the control valve 47 are opened, and the cooling water provided by the cooling water tower passes through the double-channel condenser after passing through the pre-cooling plate heat exchanger, and finally returns to the cooling water tower.

[0083] Case 4, when the cooling water temperature is very high, higher than the liquid return temperature of the liquid return pipeline of the liquid cooling system, at this time, the first cooling system cannot cool the cooling medium, and the second cooling system needs to be used alone to exchange heat with the cooling medium in the liquid cooling system.

[0084] In this case, the control valve 412 and the control valve 413 are closed, the control valve 410 is always open, the cooling medium in the liquid return pipeline of the liquid cooling system directly passes through the double-channel evaporator, the required cooling medium flow is maintained by the automatic adjusting control valve 414, and the temperature of the cooling medium provided is adjusted by the automatic adjustment of the two cooling subsystems (compressors) in the second cooling system.

[0085] The hot return air of the machine room passes through the cold water coil, and the cold air temperature supplied to the machine room is adjusted by the automatic adjusting control valve 71.

[0086] The control valve 45 and the control valve 46 are closed, the control valve 43 and the control valve 47 are opened, and the cooling water provided by the cooling water tower passes through the double-channel condenser and directly returns to the cooling water tower.

[0087] Based on the above control principle, the embodiment of the application provides a control method of a refrigeration system, which is applied to the refrigeration system provided by the embodiment of the application, such as Figure 8As shown, it is the implementation flow chart of the control method of the refrigeration system provided by the embodiment of the present application, and the method comprises S801-S802:

[0088] S801, acquire the temperature of the cooling water provided by the cooling water tower and the return liquid temperature of the return liquid pipeline of the liquid cooling system.

[0089] In specific implementation, the temperature of the cooling water provided by the cooling water tower and the return liquid temperature of the return liquid pipeline of the liquid cooling system can be obtained by setting temperature sensors at corresponding positions for sampling, or can be obtained by other manners, and the embodiment of the present application does not make limitation thereto.

[0090] S802, based on the temperature of the cooling water and the return liquid temperature, control the first cooling system and / or the second cooling system to exchange heat with the cooling medium in the liquid cooling system.

[0091] Obviously, those skilled in the art can make various modifications and variations to the present application without departing from the spirit and scope of the present application. Thus, if these modifications and variations of the present application belong to the scope of the claims of the present application and the equivalent technologies thereof, the present application also intends to include these modifications and variations.

Claims

1. A refrigeration system characterized by, The system comprises a cooling water tower and a plurality of machine room refrigeration terminals, wherein, The cooling water tower is connected with the plurality of machine room refrigeration terminals respectively, and is configured to provide cooling water to a first cooling system and a second cooling system in the plurality of machine room refrigeration terminals; The machine room refrigeration terminal further comprises a liquid cooling system, a liquid return pipeline of the liquid cooling system, and a liquid supply pipeline of the liquid cooling system, wherein the liquid return pipeline of the liquid cooling system is connected with the liquid supply pipeline of the liquid cooling system through the first cooling system and / or the second cooling system, and the first cooling system and the second cooling system are configured to exchange heat with a cooling medium of the liquid cooling system.

2. The system of claim 1, wherein, The first cooling system comprises a pre-cooling plate heat exchanger, and the second cooling system comprises a double-channel condenser, a double-channel evaporator, and one or two cooling subsystems connected between the double-channel condenser and the double-channel evaporator.

3. The system of claim 2, wherein, The double-channel condenser comprises any one of a double-channel plate heat exchanger or a double-channel shell-and-tube condenser, and the double-channel evaporator comprises any one of a double-channel plate heat exchanger or a double-channel shell-and-tube evaporator.

4. The system according to claim 2, wherein a water supply port of the cooling water tower is connected with a primary side inlet of the pre-cooling plate heat exchanger, a primary side outlet of the pre-cooling plate heat exchanger is connected with a primary side inlet of the double-channel condenser, and a primary side outlet of the double-channel condenser is connected with a water return port of the cooling water tower through a first control valve; a liquid return pipeline of the liquid cooling system is connected with a secondary side inlet of the pre-cooling plate heat exchanger, a secondary side outlet of the pre-cooling plate heat exchanger is connected with a primary side inlet of the double-channel evaporator, and a primary side outlet of the double-channel evaporator is connected with a liquid supply pipeline of the liquid cooling system through a second control valve.

5. The system according to claim 2, wherein a water supply port of the cooling water tower is connected with a primary side inlet of the pre-cooling plate heat exchanger and a primary side inlet of the double-channel condenser respectively, a third control valve is connected between the water supply port of the cooling water tower and the primary side inlet of the double-channel condenser, a primary side outlet of the pre-cooling plate heat exchanger is connected with the primary side inlet of the double-channel condenser through a fourth control valve, and a primary side outlet of the double-channel condenser is connected with a water return port of the cooling water tower; a liquid return pipeline of the liquid cooling system is connected with a secondary side inlet of the pre-cooling plate heat exchanger and a primary side inlet of the double-channel evaporator respectively, a fifth control valve is connected between the liquid return pipeline of the liquid cooling system and the primary side inlet of the double-channel evaporator, a secondary side outlet of the pre-cooling plate heat exchanger is connected with the primary side inlet of the double-channel evaporator through a sixth control valve, and a primary side outlet of the double-channel evaporator is connected with a liquid supply pipeline of the liquid cooling system.

6. The system according to claim 2, wherein The water supply port of the cooling water tower is connected with the primary side inlet of the pre-cooling plate heat exchanger and the primary side inlet of the double-channel condenser respectively, the seventh control valve is connected between the water supply port of the cooling water tower and the primary side inlet of the double-channel condenser, the primary side outlet of the pre-cooling plate heat exchanger is connected with the primary side inlet of the double-channel condenser and the water return port of the cooling water tower respectively, the eighth control valve is connected between the primary side outlet of the pre-cooling plate heat exchanger and the primary side inlet of the double-channel condenser, the eighth control valve and the ninth control valve are connected between the primary side outlet of the pre-cooling plate heat exchanger and the water return port of the cooling water tower, and the primary side outlet of the double-channel condenser is connected with the water return port of the cooling water tower through the tenth control valve. The liquid return pipeline of the liquid cooling system is connected with the secondary side inlet of the pre-cooling plate heat exchanger and the primary side inlet of the double-channel evaporator respectively, the eleventh control valve is connected between the liquid return pipeline of the liquid cooling system and the primary side inlet of the double-channel evaporator, the secondary side outlet of the pre-cooling plate heat exchanger is connected with the primary side inlet of the double-channel evaporator and the liquid supply pipeline of the liquid cooling system respectively, the twelfth control valve is connected between the pre-cooling plate heat exchanger and the primary side inlet of the double-channel evaporator, the twelfth control valve and the thirteenth control valve are connected between the pre-cooling plate heat exchanger and the liquid supply pipeline of the liquid cooling system, and the primary side outlet of the double-channel evaporator is connected with the liquid supply pipeline of the liquid cooling system through the fourteenth control valve.

7. The system of claim 2, wherein, The cooling subsystem comprises a compressor and an electronic expansion valve, one end of the compressor and one end of the electronic expansion valve are connected with two ends of one channel of the double-channel evaporator respectively, the other end of the compressor and the other end of the electronic expansion valve are connected with two ends of one channel of the double-channel condenser respectively.

8. The system of any one of claims 1-7, wherein, The computer room refrigeration terminal further comprises a cold water coil connected in series between the liquid return pipeline and the liquid supply pipeline of the liquid cooling system through the fifteenth control valve.

9. The system of claim 8, wherein, The computer room refrigeration terminal further comprises at least one fan arranged on one side of the cold water coil.

10. The system of any one of claims 1-7, wherein, The computer room refrigeration terminal further comprises a circulating pump arranged on the liquid supply pipeline of the liquid cooling system.

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