Series liquid-gas dual-channel data center refrigeration system

Abstract

The application provides a series liquid-gas double-channel data center refrigeration system, and belongs to the technical field of data center refrigeration. The series liquid-gas double-channel data center refrigeration system comprises a cooling tower, a secondary side of a first heat exchanger and a secondary side of a second heat exchanger which are cyclically communicated to form a natural heat dissipation system; a primary side of the first heat exchanger, a liquid storage tank, a fluorine pump, an air conditioner terminal, an electromagnetic valve and a compressor which are cyclically communicated to form a gas cooling system; the gas cooling system is further provided with a first check valve which is connected in parallel with the fluorine pump and a second check valve which is connected in parallel with a pipeline in which the electromagnetic valve and the compressor are connected in series; a primary side of the second heat exchanger and a liquid cooling server cabinet which are cyclically communicated to form a liquid cooling system; the gas cooling system and the liquid cooling system respectively exchange heat with the natural heat dissipation system through the first heat exchanger and the second heat exchanger. The series liquid-gas double-channel data center refrigeration system provided by the application has the advantages of small occupied space and low energy consumption.

Description

Technical Field

[0001] This invention belongs to the field of data center cooling technology, and more specifically, relates to a series-connected liquid-gas dual-channel data center cooling system. Background Technology

[0002] With the rapid development of big data and cloud computing, data centers are increasingly moving towards larger scale, higher density, higher reliability, and green energy efficiency. Liquid-gas dual-channel cooling technology, a branch of liquid cooling technology, is widely used in data center cooling systems due to its advantages such as supporting high-power servers, utilizing natural air cooling, and low energy consumption. Liquid-gas dual-channel technology typically employs two independent systems—a liquid cooling system and a gas cooling system. The heat generated by server CPUs and other electronic components accounts for 70%-80% of the total heat generation in the data center, and this heat is removed by the liquid cooling system; the remaining 20%-30% of the heat is removed by the gas cooling system at the air conditioning terminals.

[0003] Liquid cooling and air cooling systems are set up independently, which requires a large area, more equipment and piping, and higher costs, hindering integrated development. Furthermore, since 20% of the heat in a data center is typically removed by mechanical cooling with compressors, it consumes a portion of electrical energy. According to T / CIE 051-2018 "Design Specification for Data Centers with Liquid / Air Dual-Channel Cooling," the temperature of the air intake area of ​​air-cooled aisle cabinets should be 18℃-30℃. In some summer days in southern China, the outlet water temperature of cooling towers exceeds 30℃. To meet the specifications and the reliability of the data center, relying solely on natural cooling is no longer sufficient.

[0004] The liquid-gas dual-channel cooling system currently used in data centers urgently needs improvement. Summary of the Invention

[0005] The purpose of this invention is to provide a series-connected liquid-gas dual-channel data center cooling system, which aims to solve the technical problems of current data center cooling systems having a large footprint, requiring many equipment and pipelines, and having high energy consumption.

[0006] To achieve the above objectives, the technical solution adopted by the present invention is: to provide a series-connected liquid-gas dual-channel data center cooling system, comprising: a cooling tower, a first heat exchanger, an air conditioning terminal, a second heat exchanger, and a liquid-cooled server rack;

[0007] The cooling tower, the secondary side of the first heat exchanger, and the secondary side of the second heat exchanger are connected in series to form a natural heat dissipation system.

[0008] The primary side of the first heat exchanger and the air conditioning terminal are circulated together to form an air-cooling system;

[0009] The primary side of the second heat exchanger and the liquid-cooled server rack are connected in a loop to form a liquid cooling system;

[0010] The air-cooling system and the liquid-cooling system exchange heat with the natural heat dissipation system through the first heat exchanger and the second heat exchanger, respectively. The air-cooling system and the liquid-cooling system are connected in parallel and are not connected to each other.

[0011] Furthermore, a first circulation pump is also provided between the outlet of the primary side of the second heat exchanger and the inlet of the liquid-cooled server rack.

[0012] Furthermore, the liquid cooling system is provided with a first bypass connecting the primary side outlet and inlet of the second heat exchanger, and a first three-way valve for adjusting the supply of water from the liquid-cooled server cabinet to the first bypass inlet and / or the primary side inlet of the second heat exchanger.

[0013] The water outlet of the liquid-cooled server rack can flow to the inlet of the second heat exchanger through the inlet and the first outlet of the first three-way valve, and can also flow back to the inlet of the liquid-cooled server rack through the inlet, the second outlet, and the first bypass of the first three-way valve and the water outlet of the second heat exchanger.

[0014] Furthermore, the natural heat dissipation system is also equipped with a first temperature detection device for detecting the inlet water temperature of the secondary side of the first heat exchanger, a second temperature detection device for detecting the outlet water temperature of the secondary side of the first heat exchanger, a third temperature detection device for detecting the inlet water temperature of the secondary side of the second heat exchanger, and a fourth temperature detection device for detecting the outlet water temperature of the secondary side of the second heat exchanger.

[0015] Furthermore, the natural heat dissipation system is also provided with a second bypass connecting the outlet and inlet of the cooling tower, a third bypass connecting the secondary side inlet of the first heat exchanger and the secondary side inlet of the second heat exchanger, a second three-way valve for adjusting the supply of water from the secondary side of the first heat exchanger to the inlet of the cooling tower and / or the inlet of the second bypass, and a third three-way valve for adjusting the supply of the confluence liquid of the cooling tower outlet and the second bypass outlet to the primary side inlet of the first heat exchanger and / or the inlet of the third bypass.

[0016] Furthermore, the first temperature detection device, the second temperature detection device, the third temperature detection device, the fourth temperature detection device, the second three-way valve, and the third three-way valve are respectively connected to the control device;

[0017] The control device can adjust the opening degree of the second three-way valve and / or the third three-way valve based on the temperatures of the first heat exchanger and the second heat exchanger.

[0018] Furthermore, a second circulation pump is provided between the cooling tower outlet and the second bypass outlet.

[0019] Furthermore, the natural heat dissipation system is also provided with a fourth bypass connecting the inlet and outlet of the secondary side of the second heat exchanger, and a fourth three-way valve for adjusting the supply of the mixed liquid of the water outlet of the secondary side of the first heat exchanger and the water outlet of the third bypass to the inlet and / or outlet of the secondary side of the second heat exchanger.

[0020] The beneficial effects of the series-connected liquid-gas dual-channel data center cooling system provided by this invention are as follows: Compared with the prior art, this series-connected liquid-gas dual-channel data center cooling system connects the liquid cooling system and the gas cooling system in series, sharing a cooling tower. This significantly reduces equipment and piping investment, lowers purchase and production costs, saves space, facilitates unified management and control, and improves cooling efficiency. It is suitable not only for large data centers but also for small containerized data centers, and features modularity. Furthermore, since the inlet water temperature on the secondary side of the second heat exchanger in the liquid cooling system can reach 40°C, connecting the liquid cooling system and the gas cooling system in series allows the higher-temperature water from the first heat exchanger in the gas cooling system to enter the second heat exchanger for heat exchange in the liquid cooling system. This effectively increases the inlet and outlet water temperatures of the liquid cooling system, thereby achieving energy savings.

[0021] In addition, compressor cooling can remove approximately 5%-10% of the heat from a data center throughout the year, during which time the cooling system consumes a significant amount of electricity. A refrigerant pump system can fully utilize the natural air cooling of the cooling tower throughout the year, removing approximately 10%-15% of the heat from the data center. It is known that liquid cooling systems can remove 80% of the heat from a data center. Therefore, the integrated system combining a liquid-gas dual-channel system with a refrigerant pump can remove 90%-95% of the heat from the data center (80% from liquid cooling and 10%-15% from the refrigerant pump system), with only 5%-10% of the heat requiring mechanical cooling from the compressor, resulting in significant energy savings and reduced power consumption. Furthermore, because the series-connected liquid-gas dual-system data center cooling system provided by this invention only requires the compressor to be turned on during the high temperatures of summer, it effectively reduces the compressor's operating time, achieving natural cooling for most of the year. This solves the heat dissipation problem of large, high-power-density data centers and further reduces power consumption. Attached Figure Description

[0022] To more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0023] Figure 1 This is a schematic diagram of the structure of a series-connected liquid-gas dual-channel data center cooling system provided in an embodiment of the present invention;

[0024] Figure 2 This is a schematic diagram of the control structure provided in an embodiment of the present invention.

[0025] In the diagram: 1. Cooling tower; 2. First heat exchanger; 3. Liquid storage tank; 4. Refrigerant pump; 5. Expansion valve; 6. Air conditioning terminal; 7. Solenoid valve; 8. Compressor; 9. Second heat exchanger; 10. Control device; 11. Liquid-cooled server rack; 12. First check valve; 13. Second check valve; 14. Third check valve; 15. First circulation pump; 16. First bypass; 17. First three-way valve; 18. First temperature detection device; 19. Second temperature detection device; 20. Third temperature detection device; 21. Fourth temperature detection device; 22. Second circulation pump; 23. Second bypass; 24. Third bypass; 25. Second three-way valve; 26. Third three-way valve; 27. Fourth bypass; 28. Fourth three-way valve. Detailed Implementation

[0026] To make the technical problems to be solved, the technical solutions, and the beneficial effects of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present invention and are not intended to limit the present invention.

[0027] Please refer to the following: Figure 1 The following describes the series-connected liquid-gas dual-channel data center cooling system provided by an embodiment of the present invention. The series-connected liquid-gas dual-channel data center cooling system includes a cooling tower 1, a first heat exchanger 2, a liquid storage tank 3, a refrigerant pump 4, an expansion valve 5, an air conditioning terminal 6, a solenoid valve 7, a compressor 8, a second heat exchanger 9, and a liquid-cooled server rack 11. The cooling tower 1, the secondary side of the first heat exchanger 2, and the secondary side of the second heat exchanger 9 are circulated and connected to form a natural heat dissipation system. The primary side of the first heat exchanger 2, the liquid storage tank 3, the refrigerant pump 4, the air conditioning terminal 6, the solenoid valve 7, and the compressor 8 are circulated and connected to form an air-cooling system. The air-cooling system also includes a first one-way valve 12 connected in parallel with the refrigerant pump 4, and a second one-way valve 13 connected in parallel with the series pipeline of the solenoid valve 7 and the compressor 8. The primary side of the second heat exchanger 9 and the liquid-cooled server rack 11 are circulated and connected to form a liquid-cooling system. The air-cooling system and the liquid-cooling system exchange heat with the natural heat dissipation system through the first heat exchanger 2 and the second heat exchanger 9, respectively.

[0028] During cooling, 80% of the heat inside the data center server is transferred to the primary side of the second heat exchanger 9 via the liquid-cooled server rack 11 and corresponding liquid-cooled pipes. The primary side exchanges heat with the secondary side, transferring the heat to the natural cooling system, and finally dissipates it into the atmosphere through the cooling tower 1. The remaining 20% ​​of the heat inside the data center server is transferred to the primary side of the first heat exchanger 2 via the air conditioning terminal 6 and corresponding air-cooled pipes. The primary side exchanges heat with the secondary side, transferring the heat to the natural cooling system, and finally dissipates it into the atmosphere through the cooling tower 1.

[0029] The liquid cooling system operates year-round, removing 80% of the data center's heat. The air cooling system selects the appropriate cooling method based on the region and season, as detailed below:

[0030] When the temperature is high (such as in summer), disconnect the refrigerant pump 4 and turn on the compressor 8 and solenoid valve 7. The refrigerant flowing out of the primary side outlet of the first heat exchanger 2 passes sequentially through the liquid receiver 3, the first one-way valve 12, the air conditioning terminal 6, the solenoid valve 7, and the compressor 8, before flowing back to the primary side inlet of the first heat exchanger 2. The function of the liquid receiver 3 is to provide the refrigerant pump 4 with a sufficient amount of liquid refrigerant.

[0031] When the temperature is relatively cold (such as in spring, autumn, or winter), turn on the refrigerant pump 4, turn off the compressor 8, and close the solenoid valve 7. The refrigerant coming out of the primary side outlet of the first heat exchanger 2 flows back to the primary side inlet of the first heat exchanger 2 through the liquid receiver 3, the refrigerant pump 4, the air conditioning terminal 6, and the second one-way valve 13.

[0032] During the transitional season, when the temperature is between the critical temperature of the fully open refrigerant pump 4 and the critical operating temperature of the fully open compressor 8, the refrigerant pump 4 is turned on, the compressor 8 is turned on, and the solenoid valve 7 is opened. The refrigerant coming out of the primary side outlet of the first heat exchanger 2 flows sequentially through the liquid receiver 3, the refrigerant pump 4, the expansion valve 5, the air conditioning terminal 6, the solenoid valve 7, and the compressor 8, and then flows back to the primary side inlet of the first heat exchanger 2.

[0033] The series-connected liquid-gas dual-system data center cooling system with a fluorinated pump provided in this invention, compared with the prior art, connects the liquid cooling system and the gas cooling system in series, sharing a cooling tower 1. This significantly reduces equipment and piping investment, lowers purchase and production costs, saves space, facilitates unified management and control, and improves cooling efficiency. It is suitable not only for large data centers but also for small containerized data centers, exhibiting modular characteristics. Furthermore, since the inlet water temperature on the secondary side of the second heat exchanger 9 in the liquid cooling system can reach 40°C, connecting the liquid cooling system and the gas cooling system in series allows the higher-temperature water from the first heat exchanger 2 to enter the second heat exchanger 9 for heat exchange in the liquid cooling system, effectively increasing the inlet and outlet water temperatures of the liquid cooling system and thus achieving energy savings.

[0034] In addition, compressor cooling can remove approximately 5%-10% of the heat from the data center throughout the year, during which the cooling system consumes a significant amount of electricity. The refrigerant pump system can fully utilize the natural air cooling of cooling tower 1 throughout the year, removing approximately 10%-15% of the heat from the data center. It is known that liquid cooling systems can remove 80% of the heat from the data center. Therefore, the integrated system combining a liquid-gas dual-channel system with a refrigerant pump can remove 90%-95% of the heat from the data center (80% from liquid cooling and 10%-15% from the refrigerant pump system), with only 5%-10% of the heat requiring compressor mechanical cooling, thus significantly reducing energy consumption and power consumption. Furthermore, because the data center cooling system with a refrigerant pump provided by this invention uses a series-connected liquid-gas dual-system, compressor 8 only needs to be activated during the high temperatures of summer, effectively reducing the operating time of compressor 8 and achieving natural cooling for most of the year. This solves the heat dissipation problem of large, high-power-density data centers and further reduces power consumption.

[0035] Specifically, water flows through the pipeline between cooling tower 1 and the secondary side of the first heat exchanger 2 and the secondary side of the second heat exchanger 9; refrigerant flows through the primary side of the first heat exchanger 2; and refrigerant, deionized water, ethylene glycol, etc., flow through the primary side of the second heat exchanger 9.

[0036] As a specific embodiment of the series-connected liquid-gas dual-channel data center cooling system with fluorine pump 4 provided by the present invention, please refer to Figure 1 A third check valve 14 is connected in series between the compressor 8 and the primary side of the first heat exchanger 2. The solenoid valve 7, the compressor 8 and the third check valve 14 are connected in series to form a compressor refrigeration pipeline. The compressor refrigeration pipeline is connected in parallel with the second check valve 13.

[0037] The primary side outlet of the first heat exchanger 2 is connected to the inlet of the liquid storage tank 3. The outlet of the liquid storage tank 3 is connected to the inlet of the refrigerant pump 4. The outlet of the refrigerant pump 4 is connected to the inlet of the expansion valve 5. The outlet of the expansion valve 5 is connected to the inlet of the air conditioning terminal 6. The air conditioning terminal 6 mainly consists of two major components: an evaporator 61 and a variable frequency fan 62. The air conditioning terminal 6 can be a room-level air conditioner, a row-level air conditioner, or other types of air conditioners. The outlet of the air conditioning terminal 6 is connected to the inlet of the solenoid valve 7. The outlet of the solenoid valve 7 is connected to the inlet of the compressor 8. The outlet of the compressor 8 is connected to the inlet of the third one-way valve 14. The outlet of the third one-way valve 14 is connected to the primary side inlet of the first heat exchanger 2. Among them, the first one-way valve 12 bypasses the refrigerant pump 4. The inlet of the first one-way valve 12 is located between the liquid storage tank 3 and the refrigerant pump 4, and the inlet of the first one-way valve 12 is located between the refrigerant pump 4 and the expansion valve 5. The second check valve 13 can bypass the pipeline formed by the third check valve 14, the compressor 8 and the solenoid valve 7 connected in series. The inlet of the second check valve 13 is located between the expansion valve 5 and the outlet of the air conditioning terminal 6, and the outlet of the second check valve 13 is located between the third check valve 14 and the primary side inlet of the first heat exchanger 2.

[0038] The third check valve 14 effectively prevents the refrigerant flowing out of the second check valve 13 from flowing back into the compressor 8, reducing the risk of damage to the compressor 8.

[0039] As a specific embodiment of the series-connected liquid-gas dual-channel data center cooling system with fluorine pump 4 provided by the present invention, please refer to Figure 1 A first circulation pump 15 is also provided between the outlet of the primary side of the second heat exchanger 9 and the inlet of the liquid-cooled server rack 11.

[0040] The primary side outlet of the second heat exchanger 9 is connected to the inlet of the first circulating water pump, the outlet of the first circulating water pump is connected to the inlet of the liquid-cooled server rack 11, and the outlet of the liquid-cooled server rack 11 is connected to the primary side inlet of the second heat exchanger 9.

[0041] The first circulation pump 15 ensures smooth refrigerant circulation within the liquid cooling system, guaranteeing the cooling effect.

[0042] As a specific embodiment of the series-connected liquid-gas dual-channel data center cooling system with fluorine pump 4 provided by the present invention, please refer to Figure 1 The liquid cooling system is equipped with a first bypass 16 that connects the primary side outlet and inlet of the second heat exchanger 9, and a first three-way valve 17 for adjusting the amount of water supplied from the liquid-cooled server cabinet 11 to the inlet of the first bypass 16 and / or the primary side inlet of the second heat exchanger 9.

[0043] The water outlet of the liquid-cooled server rack 11 can flow to the inlet of the second heat exchanger 9 through the inlet and the first outlet of the first three-way valve 17, and can also flow back to the inlet of the liquid-cooled server rack 11 through the inlet, the second outlet, the first bypass 16 of the first three-way valve 17 and the water outlet of the second heat exchanger 9.

[0044] The inlet of the first three-way valve 17 is connected to the outlet of the liquid-cooled server rack 11 via a pipeline. The first outlet is connected to the primary side inlet of the second heat exchanger 9 via a pipeline, and the second outlet is connected to the inlet of the first bypass 16. The outlet of the first bypass 16 is connected to a pipeline connecting the primary side outlet of the second heat exchanger 9 and the inlet of the liquid-cooled server rack 11. When the temperature of the liquid-cooled server rack 11 is not high, the first and second outlets can be opened simultaneously. A portion of the liquid flowing out of the outlet of the liquid-cooled server rack 11 flows to the second heat exchanger 9 through the first outlet for heat exchange, while the other portion flows back to the liquid-cooled server rack 11 after merging with the liquid flowing out of the primary side outlet of the second heat exchanger 9 through the first bypass 16. This increases the temperature of the refrigerant entering the liquid-cooled server rack 11. In summary, the cooling capacity of the liquid cooling system can be adjusted by regulating the opening of the bypass (i.e., the second outlet) of the first three-way valve 17.

[0045] As a specific embodiment of the series-connected liquid-gas dual-channel data center cooling system with fluorine pump 4 provided by the present invention, please refer to Figure 1 The natural heat dissipation system is also equipped with a first temperature detection device 18 for detecting the secondary side inlet water temperature of the first heat exchanger 2, a second temperature detection device 19 for detecting the secondary side outlet water temperature of the first heat exchanger 2, a third temperature detection device 20 for detecting the secondary side inlet water temperature of the second heat exchanger 9, and a fourth temperature detection device 21 for detecting the secondary side outlet water temperature of the second heat exchanger 9.

[0046] The installation of the first temperature detection device 18, the second temperature detection device 19, the third temperature detection device 20, and the fourth temperature detection device 21 enables operators to obtain the temperature of the secondary side of the first heat exchanger 2 and the secondary side of the second heat exchanger 9 in real time and accurately, and adjust the supply and return water temperature in the natural heat dissipation system according to the detection results to ensure that the entire cooling system always meets the cooling requirements of the data center.

[0047] Specifically, when the secondary side temperatures of the first heat exchanger 2 and the second heat exchanger 9 are detected to be low, the operator can adjust the opening of the variable frequency fan and variable frequency water pump of the cooling tower 1 according to the cooling needs of the data center, thereby increasing the temperature of the supply and return water in the natural heat dissipation system.

[0048] As a specific embodiment of the series-connected liquid-gas dual-channel data center cooling system with fluorine pump 4 provided by the present invention, please refer to Figure 1The natural heat dissipation system is also equipped with a second bypass 23 connecting the outlet and inlet of cooling tower 1, a third bypass 24 connecting the secondary side inlet of first heat exchanger 2 and the secondary side inlet of second heat exchanger 9, a second three-way valve 25 for adjusting the supply of water from the secondary side of first heat exchanger 2 to the inlet of cooling tower 1 and / or the inlet of second bypass 23, and a third three-way valve 26 for adjusting the supply of the combined liquid from the outlet of cooling tower 1 and the outlet of second bypass 23 to the primary side inlet of first heat exchanger 2 and / or the inlet of third bypass 24.

[0049] When the secondary side temperatures of the first heat exchanger 2 and the second heat exchanger 9 are detected to be low, the parameters of the cooling tower 1 can be left unchanged. Instead, the bypass valve of the second three-way valve 25 can be opened, connecting the inlet and outlet of the second three-way valve 25. This allows the higher-temperature return water flowing from the secondary side outlet of the second heat exchanger 9 to mix with the lower-temperature supply water flowing from the outlet of the cooling tower 1 via the second bypass 23 before re-entering the first heat exchanger 2. This adjustment method cleverly utilizes the temperature of the return water in the natural cooling system to increase the supply water temperature and reduces the amount of return water received by the cooling tower 1. This increases both the supply and return water temperatures in the natural cooling system and reduces the energy consumption required for cooling, achieving energy-saving cooling requirements.

[0050] When the first temperature detection device 18 and the second temperature detection device 19 detect that the secondary side temperature of the first heat exchanger 2 is too low, and at the same time the third temperature detection device 20 and the fourth temperature detection device 21 detect that the secondary side temperature of the second heat exchanger 9 is too high, the bypass valve of the third three-way valve 26 can be opened and adjusted so that the inlet of the third three-way valve 26 is connected to both the first outlet and the second outlet. In this way, some of the lower temperature water from the cooling tower 1 can be directly mixed with the secondary side water from the first heat exchanger 2 through the third bypass 24 and then enter the second heat exchanger 9, thereby effectively reducing the temperature of the secondary side of the second heat exchanger 9 and ensuring the good cooling effect of the liquid cooling system.

[0051] The second three-way valve 25 and the third three-way valve 26 enable the connection between pipes at different locations. This allows the cooling tower 1 parameters to be adjusted or the equipment to be replaced when the temperature of the natural heat dissipation system or the liquid cooling system is high. The temperature difference between the supply and return water in the pipes at different locations in the natural heat dissipation system can be used to cool the secondary side of the supply and return water in the natural heat dissipation system or the secondary side of the second heat exchanger 9 used for cooling the liquid cooling system. This is convenient to operate and energy-efficient.

[0052] As a specific embodiment of the series-connected liquid-gas dual-channel data center cooling system with fluorine pump 4 provided by the present invention, please refer to Figure 2The first temperature detection device 18, the second temperature detection device 19, the third temperature detection device 20, the fourth temperature detection device 21, the second three-way valve 25, and the third three-way valve 26 are respectively connected to the control device 10. The control device 10 can adjust the opening degree of the second three-way valve 25 and / or the third three-way valve 26 according to the temperature of the first heat exchanger 2 and the second heat exchanger 9.

[0053] The first temperature detection device 18, the second temperature detection device 19, the third temperature detection device 20, and the fourth temperature detection device 21 can each be a temperature sensor, and the second three-way valve 25 and the third three-way valve 26 are each an electrically controlled three-way valve. In use, the control device 10 acquires the detection data from each temperature sensor, analyzes the data through a built-in program, and controls the opening of the second three-way valve 25 and the third three-way valve 26 to regulate the supply and return water temperatures within the natural heat dissipation system and the secondary side temperature of the second heat exchanger 9.

[0054] The control device 10 enables automatic control of the second three-way valve 25 and the third three-way valve 26 without manual operation, which greatly improves the timeliness and accuracy of the adjustment of the second three-way valve 25 and the third three-way valve 26.

[0055] Specifically, the control device 10 can adopt a PLC control system. Before use, the required execution program is pre-stored in the PLC control system. When the control device 10 detects that the temperature values ​​detected by the first temperature detection device 18, the second temperature detection device 19, the third temperature detection device 20 and the fourth temperature detection device 21 are lower than their respective temperature thresholds, it controls the bypass valve of the second three-way valve 25 to open, so that the inlet of the second three-way valve 25 is connected to the second outlet. In this way, the higher temperature return water flowing out of the secondary side outlet of the second heat exchanger 9 can be mixed with the lower temperature supply water flowing out of the outlet of the cooling tower 1 through the second bypass 23 and then re-enter the first heat exchanger 2.

[0056] When the control device 10 detects that the temperature values ​​detected by the first temperature detection device 18 and the second temperature detection device 19 are lower than their respective temperature thresholds, and the temperature values ​​detected by the third temperature detection device 20 and the fourth temperature detection device 21 are higher than their respective temperature thresholds, it controls the bypass valve of the third three-way valve 26 to open at a certain angle, so that the inlet of the third three-way valve 26 is connected to both the first outlet and the second outlet. In this way, some of the lower temperature water from the cooling tower 1 can directly enter the second heat exchanger 9 after mixing with the secondary side water from the first heat exchanger 2 through the third bypass 24.

[0057] As a specific embodiment of the series-connected liquid-gas dual-channel data center cooling system with fluorine pump 4 provided by the present invention, please refer to Figure 1 A second circulation pump 22 is installed between the outlet of cooling tower 1 and the outlet of the second bypass 23.

[0058] The outlet of cooling tower 1 is connected to the inlet of the second circulating pump 22, the outlet of the second circulating pump 22 is connected to the secondary side inlet of the first heat exchanger 2, the secondary side outlet of the first heat exchanger 2 is connected to the secondary side inlet of the second heat exchanger 9, and the primary side outlet of the second heat exchanger 9 is connected to the inlet of cooling tower 1.

[0059] The second circulation pump 22 ensures the smooth circulation of water supply and return within the natural heat dissipation system, guaranteeing a good cooling effect for the natural heat dissipation system.

[0060] As a specific embodiment of the series-connected liquid-gas dual-channel data center cooling system with fluorine pump 4 provided by the present invention, please refer to Figure 1 The natural heat dissipation system is also equipped with a fourth bypass 27 that connects the secondary side inlet and outlet of the second heat exchanger 9, and a fourth three-way valve 28 for adjusting the supply of the mixed liquid of the secondary side outlet of the first heat exchanger 2 and the outlet of the third bypass 24 to the secondary side inlet and / or outlet of the second heat exchanger 9.

[0061] When a pipe in the liquid cooling system malfunctions, the bypass valve of the fourth three-way valve 28 can be fully opened, so that the inlet of the fourth three-way valve 28 is connected to the second outlet. At the same time, the secondary side inlet valve of the second heat exchanger 9 is closed. At this time, the liquid cooling system is removed from the refrigeration system, and the air cooling system will bear the full heat load, which can provide emergency relief and delay the process for a certain period of time.

[0062] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A series-connected liquid-gas dual-channel data center cooling system, characterized in that: The system includes a cooling tower, a first heat exchanger, an air conditioning terminal, a second heat exchanger, and a liquid-cooled server rack. The cooling tower, the secondary side of the first heat exchanger, and the secondary side of the second heat exchanger are connected in series to form a natural heat dissipation system. The primary side of the first heat exchanger and the air conditioning terminal are connected in series to form an air-cooling system. The higher-temperature water from the air-cooling system, after passing through the first heat exchanger, enters the second heat exchanger for heat exchange in the liquid-cooling system. The primary side of the second heat exchanger and the liquid-cooled server rack are connected in series to form a liquid-cooling system. The air-cooling system and the liquid-cooling system exchange heat with the natural heat dissipation system through the first heat exchanger and the second heat exchanger, respectively. The air-cooling system and the liquid-cooling system are connected in parallel and are not connected to each other.

2. The series-connected liquid-gas dual-channel data center cooling system as described in claim 1, characterized in that: A first circulation pump is also provided between the outlet of the primary side of the second heat exchanger and the inlet of the liquid-cooled server rack.

3. The series-connected liquid-gas dual-channel data center cooling system as described in claim 1, characterized in that: The liquid cooling system is provided with a first bypass connecting the primary side outlet and inlet of the second heat exchanger, and a first three-way valve for adjusting the water supply from the liquid-cooled server cabinet to the first bypass inlet and / or the primary side inlet of the second heat exchanger. The water outlet of the liquid-cooled server rack can flow to the inlet of the second heat exchanger through the inlet and the first outlet of the first three-way valve, and can also flow back to the inlet of the liquid-cooled server rack through the inlet, the second outlet, and the first bypass of the first three-way valve and the water outlet of the second heat exchanger.

4. The series-connected liquid-gas dual-channel data center cooling system as described in any one of claims 1-3, characterized in that: The natural heat dissipation system is also equipped with a first temperature detection device for detecting the inlet water temperature of the secondary side of the first heat exchanger, a second temperature detection device for detecting the outlet water temperature of the secondary side of the first heat exchanger, a third temperature detection device for detecting the inlet water temperature of the secondary side of the second heat exchanger, and a fourth temperature detection device for detecting the outlet water temperature of the secondary side of the second heat exchanger.

5. The series-connected liquid-gas dual-channel data center cooling system as described in claim 4, characterized in that: The natural heat dissipation system is also provided with a second bypass connecting the outlet and inlet of the cooling tower, a third bypass connecting the secondary side inlet of the first heat exchanger and the secondary side inlet of the second heat exchanger, a second three-way valve for adjusting the supply of water from the secondary side of the first heat exchanger to the inlet of the cooling tower and / or the inlet of the second bypass, and a third three-way valve for adjusting the supply of the confluence liquid of the cooling tower outlet and the second bypass outlet to the primary side inlet of the first heat exchanger and / or the inlet of the third bypass.

6. The series-connected liquid-gas dual-channel data center cooling system as described in claim 5, characterized in that: The first temperature detection device, the second temperature detection device, the third temperature detection device, the fourth temperature detection device, the second three-way valve, and the third three-way valve are respectively connected to the control device; the control device can adjust the opening degree of the second three-way valve and / or the third three-way valve by the temperature of the first heat exchanger and the second heat exchanger.

7. The series-connected liquid-gas dual-channel data center cooling system as described in claim 6, characterized in that: A second circulation pump is installed between the cooling tower outlet and the second bypass outlet.

8. The series-connected liquid-gas dual-channel data center cooling system as described in any one of claims 6-7, characterized in that: The natural heat dissipation system is also provided with a fourth bypass connecting the inlet and outlet of the secondary side of the second heat exchanger, and a mixed liquid for adjusting the flow of the water from the secondary side of the first heat exchanger and the water from the third bypass to the secondary side of the second heat exchanger.

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