A gas-liquid cooling system and control method for a data center

Abstract

The present invention discloses a gas-liquid heat dissipation system and control method for a data center, comprising a gas-liquid heat dissipation heat pipe module, an air cooling unit, a liquid cooling unit, an outdoor cooling unit, and a control unit. The gas-liquid heat dissipation heat pipe module is arranged on a server to be cooled, the air cooling unit and the liquid cooling unit are respectively connected to the gas-liquid heat dissipation heat pipe module, the outdoor cooling unit is respectively connected to the air cooling unit and the liquid cooling unit, and the control unit is respectively connected to the air cooling unit, the liquid cooling unit, and the outdoor cooling unit, for realizing an air cooling mode, a liquid cooling mode, and a gas-liquid coordinated cooling mode according to the temperature of the inlet and outlet liquid and / or gas of the gas-liquid heat dissipation heat pipe module. The present invention realizes customized heat dissipation of servers under different power consumption, meets the heat dissipation requirements of the servers, and reduces the waste of resources.

Description

Technical Field

[0001] The present invention relates to the technical field of heat dissipation and cooling of data centers, and in particular to a gas-liquid heat dissipation system and a control method for a data center. Background Art

[0002] With the maturity of 5G technology, the application of technologies related to massive data and high-performance computing, such as intelligent manufacturing, engineering simulation, and smart factories, has begun to develop by leaps and bounds. It has developed from laboratory research to real industrial applications, which in turn has prompted data centers to tend to cluster and high power density, while also putting higher requirements on the heat dissipation methods of data centers.

[0003] Against this backdrop, liquid cooling has seen significant development and application in data center cooling in recent years due to its higher heat dissipation efficiency. Among various liquid cooling methods, microchannel liquid-cooled plate heat pipe radiators can avoid direct contact between the liquid working medium and electronic equipment, reducing corrosion and the risk of short circuits caused by direct contact. With advantages such as high reliability and easy maintenance, they are an ideal choice for solving data center heat dissipation problems.

[0004] However, while microchannel liquid-cooled plate heat pipe radiators can effectively meet the cooling needs of servers under high load and ensure safe operation, servers are not always running at full capacity. Existing data center indirect liquid cooling systems continuously use coolant to precisely cool the heat-generating CPU components. However, when the server is low power, the cooling capacity is oversupplied, resulting in significant resource waste and not meeting the requirements of green data center development. Summary of the Invention

[0005] In order to overcome the shortcomings and deficiencies of the prior art, the present invention provides a data center gas-liquid cooling system and a control method.

[0006] The present invention adopts the following technical solutions:

[0007] A data center gas-liquid cooling system includes a gas-liquid cooling heat pipe module, an air cooling unit, a liquid cooling unit, an outdoor cooling unit and a control unit. The gas-liquid cooling heat pipe module is arranged on a server to be cooled, the air cooling unit and the liquid cooling unit are respectively connected to the gas-liquid cooling heat pipe module, the outdoor cooling unit is respectively connected to the air cooling unit and the liquid cooling unit, and the control unit is respectively connected to the air cooling unit, the liquid cooling unit and the outdoor cooling unit, and is used to realize an air cooling mode, a liquid cooling mode and a gas-liquid coordinated cooling mode according to the temperature of the inlet and outlet liquid and / or gas of the gas-liquid cooling heat pipe module.

[0008] Furthermore, the air cooling unit includes an air compressor, an air storage tank, an air cooling control valve, an air cooling filter, an air cooling plate heat exchanger, a gas flow meter and an air cooling temperature sensor for monitoring the gas temperature at the air inlet and outlet of the gas-liquid heat dissipation heat pipe module.

[0009] Furthermore, the liquid cooling unit includes a liquid storage tank, a power pump, a liquid cooling filter, a liquid cooling control valve, a liquid flow meter, a liquid cooling plate heat exchanger and a liquid cooling temperature sensor for monitoring the liquid temperature at the liquid inlet and outlet of the gas-liquid heat dissipation heat pipe module.

[0010] Furthermore, the gas-liquid heat dissipation heat pipe module includes a heat pipe heat conduction unit and a heat exchange unit, the heat pipe heat conduction unit includes a heat sink and a heat pipe; the heat exchange unit includes a gas-liquid cold plate and a sealing plate cover.

[0011] Furthermore, the air-liquid cold plate includes two layers of flow channels, namely air cooling flow channels and liquid cooling flow channels. The two layers of flow channels are symmetrically distributed up and down and are not connected to each other.

[0012] A control method based on the gas-liquid cooling system of a data center includes the following steps:

[0013] After the cooling server is started, the air-liquid cooling system of the data center is started;

[0014] Start air cooling mode;

[0015] The control unit collects the gas temperature at the air inlet and the gas temperature at the air outlet of the gas-liquid heat dissipation heat pipe module to obtain the gas temperature difference;

[0016] Determine whether the gas temperature difference is greater than T Air-1(max) If yes, proceed to the next step to start the liquid cooling mode, otherwise execute the step of determining the gas temperature difference;

[0017] Start the liquid cooling mode and stop the air cooling mode;

[0018] The control unit collects the liquid temperature at the liquid inlet and the liquid outlet of the gas-liquid heat pipe module and calculates the liquid temperature difference;

[0019] Determine whether the liquid temperature difference is greater than T Liquid-1（max） If it is greater than, the next step is to start the gas-liquid coordinated cooling mode, otherwise, the step of determining the liquid temperature difference is executed;

[0020] Start the gas-liquid collaborative cooling mode, with the air cooling unit and liquid cooling unit running simultaneously;

[0021] The control unit obtains the gas temperature difference between the gas inlet and outlet and the liquid temperature difference between the liquid inlet and outlet of the gas-liquid heat pipe module;

[0022] Determine whether the gas temperature difference and liquid temperature difference are both less than the set Tcombine-air , T combine-Liquid

[0023] If so, the liquid cooling mode is started, otherwise the gas temperature difference and liquid temperature difference of the gas-liquid heat pipe module are continued to be collected.

[0024] Furthermore, in the air cooling mode, the step of determining the gas temperature difference includes: determining whether the gas temperature difference is less than T Air-2(min) If yes, stop the cooling system; otherwise, return to the step of collecting the gas temperature at the air inlet and the gas temperature at the air outlet of the gas-liquid cooling heat pipe module.

[0025] Furthermore, in the liquid cooling mode, the step of determining the liquid temperature difference includes: determining whether the liquid temperature difference is less than T Liquid-2（min） If yes, stop the liquid cooling mode and start the air cooling mode. If no, return to the step of collecting the liquid temperature at the liquid inlet and outlet.

[0026] further,

[0027] Air cooling mode: T Air-1(max) The maximum allowable gas temperature difference is set to 8~10℃;

[0028] Liquid cooling mode: T Liquid-1（max） The maximum allowable value of liquid temperature difference is set to: 8~10℃;

[0029] T Liquid-2（min） The minimum allowable value of liquid temperature difference is set to: 3~5℃;

[0030] Gas-liquid collaborative cooling mode:

[0031] T combine-air The minimum allowable value for gas is set to 7-9°C.

[0032] T combine-Liquid It is the minimum allowable value for liquid and is set to 5-7℃.

[0033] Furthermore, the gas-liquid collaborative cooling mode is specifically:

[0034] The air compressor and the power pump work at the same time, the liquid cooling control valve and the air cooling control valve are both opened, and the power pump power of the outdoor cooling unit is increased to 2p, and the cold air and the coolant flow into the air cooling flow channel and the liquid cooling flow channel from the air inlet and the liquid inlet respectively; the cold air and the coolant perform convective heat exchange with the air cooling flow channel and the liquid cooling flow channel respectively; after completing the heat exchange, the cold air and the coolant flow out from the air outlet and the liquid outlet respectively, taking away the heat at the same time.

[0035] Beneficial effects of the present invention:

[0036] (1) The gas-liquid cooling system for a data center of the present invention retains the efficient heat dissipation capability of an indirect liquid cooling system while avoiding the need to continuously use cooling liquid to precisely cool the heat-generating component CPU, thereby reducing waste of resources and meeting the requirements for the development of green data centers.

[0037] (2) The gas-liquid cooling system for a data center of the present invention has three cooling modes: liquid cooling, air cooling, and gas-liquid coordinated cooling. It can be flexibly selected and adjusted according to the cooling needs of the server. It can meet the cooling needs of a data center with servers of different power levels placed in the same computer room or the same cabinet, and has a wider range of applications.

[0038] (3) This control method accurately realizes the real-time switching of the three cooling modes by setting judgment conditions, thus reducing resource waste. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] Figure 1 It is a structural schematic diagram of the present invention;

[0040] Figure 2 This is a schematic diagram of the structure of the gas-liquid heat pipe module of the present invention;

[0041] Figure 3 This is an exploded view of the gas-liquid heat pipe module of the present invention;

[0042] FIG4 (a) and FIG4 (b) are respectively a top view and a bottom view of the air-liquid cold plate of the present invention;

[0043] Figure 5 It is a control flow chart of the present invention. DETAILED DESCRIPTION

[0044] The present invention will be further described in detail below with reference to the embodiments and the accompanying drawings, but the embodiments of the present invention are not limited thereto.

[0045] Example

[0046] like Figure 1 As shown, a data center air-liquid cooling system includes an air-liquid cooling heat pipe module 1, an air cooling unit 2, a liquid cooling unit 3, an outdoor cooling unit 4 and a control unit 5.

[0047] The air cooling unit 2 includes an air compressor 21 , an air storage tank 22 , an air cooling control valve 23 , an air cooling filter 24 , an air cooling plate heat exchanger 25 , a gas flow meter 26 , an inlet air temperature sensor 27 , and an outlet air temperature sensor 28 .

[0048] The air compressor 21 compresses the gas and stores it in the gas storage tank 22; the air cooling control valve 23 is used to open or close the air cooling circuit; the air cooling filter 24 is used to filter impurities mixed in the gas after multiple cycles; the air cooling plate heat exchanger 25 cools the gas flowing out of the gas storage tank 22; the gas flow meter 26 is used to monitor the gas flow in the circulation loop of the air cooling unit 2; the inlet temperature sensor 27 and the outlet temperature sensor 28 are respectively used to monitor the gas temperatures of the air inlet 1211 and the air outlet 1214 of the gas-liquid heat dissipation heat pipe module 1.

[0049] The liquid cooling unit 3 includes a liquid storage tank 31 , a power pump 32 , a liquid cooling filter 33 , a liquid cooling control valve 34 , a liquid flow meter 35 , a liquid inlet temperature sensor 36 , a liquid outlet temperature sensor 37 and a liquid cooling plate heat exchanger 38 .

[0050] The liquid storage tank 31 is used to store and recover coolant; the power pump 32 serves as the power source for the liquid cooling unit circulation loop; the liquid cooling filter 33 is used to filter impurities mixed in the coolant after multiple cycles; the liquid cooling control valve 34 is used to disconnect or close the liquid cooling loop; the liquid flow meter 35 is used to monitor the liquid flow in the liquid cooling unit circulation loop; the liquid inlet temperature sensor 36 and the liquid outlet temperature sensor 37 are used to monitor the liquid temperature of the liquid inlet 1212 and the liquid outlet 1215 of the gas-liquid heat dissipation heat pipe module 1 respectively; the liquid cooling plate heat exchanger 38 is used to cool the coolant after absorbing heat.

[0051] The outdoor cooling unit 4 includes a cooling tower 41 and a power pump 42 .

[0052] The control unit 5 is electrically connected to the air compressor 21, air cooling control valve 23, gas flow meter 26, inlet air temperature sensor 27, outlet air temperature sensor 28 of the air cooling unit 2 and the power pump 32, liquid cooling control valve 34, liquid flow meter 35, inlet liquid temperature sensor 36, outlet liquid temperature sensor 37 of the liquid cooling unit 3 and the power pump 42 of the outdoor cooling unit 4.

[0053] like Figure 2 As shown, the gas-liquid heat dissipation heat pipe module 1 includes a heat pipe heat conduction unit 11 and a heat exchange unit 12. The heat pipe heat conduction unit 11 includes a heat sink 111 and a heat pipe 112; the heat exchange unit 12 includes a gas-liquid cold plate 121 and a sealing plate cover 122.

[0054] like Figure 3As shown, the heat sink 111 is provided with a through groove 1112 for accommodating the evaporation section 1121 of the heat pipe 112. The evaporation section 1121 of the heat pipe 112 is fixed to the heat sink 111 via soldering, ensuring that the flat surface of the evaporation section 1121 of the heat pipe 112 is flush with the bottom surface of the heat sink 111. Bolt holes 1111 in the heat sink 111 are used to secure the entire gas-liquid heat pipe mold to the surface of the CPU coated with thermal grease. The heat pipe 112 includes the evaporation section 1121, an insulating section 1122, and a condensing section 1123. The evaporation section 1121 is flat with a flat bottom surface. The liquid wick structure inside the heat pipe 112 adopts a grooved or composite structure. A through groove 1213 for accommodating the condensing section 1123 of the heat pipe 112 is provided in the middle of the air-liquid cold plate 121 , and the condensing section 1123 of the heat pipe 112 is fixedly connected to the air-liquid cold plate 121 by soldering.

[0055] like Figure 3 As shown in Figure 4 (a) and Figure 4 (b), the upper layer of the air-liquid cold plate 121 is a liquid cooling channel 1216, and is provided with a liquid inlet 1212 and a liquid outlet 1215; the lower layer of the air-liquid cold plate 121 is an air cooling channel 1217, and is provided with an air inlet 1211 and an air outlet 1214; the upper and lower layers of the channels are symmetrically distributed and are not connected to each other, and the volume of the air cooling channel is larger than that of the liquid cooling channel.

[0056] The heat sink 111 collects the heat generated by the CPU into the evaporation section 1121 of the heat pipe 112, so that the working medium inside the evaporation section 1121 absorbs the heat and evaporates to form steam. Driven by the pressure difference, the steam carries the heat and flows through the inner core of the insulation section 1122 of the heat pipe 112 to reach the condensation section 1123; the steam in the condensation section 1123 transfers the heat it carries to the heat exchange unit 12 and then re-liquefies, and flows back to the evaporation section 1121 of the heat pipe 112 under the action of the capillary force of the liquid absorption core and gravity, completing a heat transfer cycle.

[0057] In this embodiment, the liquid cooling channel is located in the upper channel, and the air cooling channel is the lower channel.

[0058] like Figure 5 As shown, the control method of the present invention is:

[0059] S1: System startup: The control unit receives the server startup signal and sets T Air-1(max) 、T Air-2(min) 、T Liquid-1（max） 、T Liquid-2（min） 、T combine-air and T combine-Liquid value.

[0060] When in air cooling mode, liquid cooling mode and gas-liquid coordinated cooling mode, the power of the power pump 42 of the outdoor cooling unit 4 is defined as P, 1.5P and 2P respectively to control the operation of the gas-liquid cooling system.

[0061] S2: Air Cooling Mode Start: Air cooling control valve 23 regulates the flow of gas from gas tank 22 into air cooling filter 24 for filtration. The filtered gas undergoes heat exchange in air cooling plate heat exchanger 25, converting it into cooler air. This cool air then flows through gas flow meter 26, inlet air temperature sensor 27, and gas-liquid heat pipe module 1. Cool air flows from inlet 1211 into air cooling channel 1217, absorbing heat from heat exchange unit 12. The absorbed air then flows through outlet air temperature sensor 28 and is recovered by air compressor 21 and returned to gas tank 22.

[0062] At the same time, the power pump 42 transports the cooled liquid in the cooling tower 41 to the air-cooled plate heat exchanger 25 in the air-cooling unit 2 to exchange heat with the gas in the air-cooling unit 2; after the liquid in the outdoor cooling unit 4 absorbs heat, it is pumped back to the cooling tower 41 for cooling.

[0063] S3: Collect T1 and T3, calculate ∆T 3-1 : The control unit 5 collects the gas temperature T1 at the air inlet 1211 and the gas temperature T3 at the air outlet 1214 of the gas-liquid heat pipe module 1, and calculates the temperature difference ∆T 3-1 = T3- T1.

[0064] S4: ∆T 3-1 Is it greater than the maximum allowable gas temperature difference T Air-1(max) ;

[0065] When the gas temperature difference ∆T 3-1 Greater than the set value T Air-1(max) , it indicates that the current cooling mode cannot meet the heat dissipation requirements of the server.

[0066] Therefore, if ∆T 3-1 Exceeding the maximum allowable value T Air-1(max) , then execute S6; if not, then execute S5.

[0067] S5: Determine ∆T within t seconds 3-1 Is it less than the minimum allowed value T Air-2(min) , and within t seconds ∆T 3-1 <T Air-2(min) Always holds true, where T Air-2(min) It is defined as a value close to 0.

[0068] When the fluid medium temperature difference is less than a set value, it indicates that the current cooling mode is over-supplying the server with cooling capacity. In particular, if the fluid medium temperature difference remains close to 0 for a certain period of time, it indicates that the server has stopped operating and the heat in the server has been largely dissipated by the cooling system.

[0069] Therefore, if ∆T 3-1 <T Air-2(min) If it is always true, execute S14; if not, return to S3.

[0070] S6: Start the liquid cooling mode and stop the air cooling mode: the power pump 32 draws the coolant out of the liquid storage tank 31 and enters the liquid cooling filter 33 to filter out impurities. The filtered coolant passes through the liquid cooling control valve 34, the liquid flow meter 35, the liquid inlet temperature sensor 36, and the gas-liquid heat dissipation heat pipe module 1 in turn. The coolant flows from the liquid inlet 1212 into the upper liquid cooling channel 1216 to absorb the heat in the heat exchange unit 12; the liquid after absorbing the heat flows out from the gas-liquid heat dissipation heat pipe module 1, passes through the liquid outlet temperature sensor 37, is cooled in the liquid cooling plate heat exchanger 38, and finally returns to the liquid storage tank 31.

[0071] At the same time, the power of the power pump 42 of the outdoor cooling unit 4 is adjusted to 1.5p, and the air-to-liquid heat dissipation system shuts down the air cooling unit. The power pump 42 delivers the cooled liquid from the cooling tower 41 to the liquid-cooled plate heat exchanger 38 in the liquid cooling unit 3, where it exchanges heat with the liquid in the liquid cooling unit 3. After the liquid in the outdoor cooling unit 4 absorbs heat, it is pumped back to the cooling tower 41 for cooling. Execution then continues with S7.

[0072] S7: Collect T2 and T4 and calculate ∆T 4-2 : The control unit 5 collects the liquid temperature T2 of the liquid inlet 1212 and the liquid temperature T4 of the liquid outlet 1215 of the gas-liquid heat pipe module, and calculates the temperature difference ∆T 4-2 = T4- T2.

[0073] S8: Determine ∆T 4-2 Whether it exceeds the maximum allowable value T Liquid-1（max） If yes, execute S11; if no, execute S9.

[0074] S9: Determine ∆T 4-2 Is it lower than the minimum allowable value T Liquid-2（min） If yes, execute S10; if no, return to S7.

[0075] S10: Stop liquid cooling mode: the power pump 32 stops working, the liquid cooling control valve 34 is closed, the heat dissipation system stops the liquid cooling mode, and returns to S2.

[0076] S11: Start the gas-liquid coordinated cooling mode: the air compressor 21 and the power pump 32 work at the same time, the air cooling control valve 23 and the liquid cooling control valve 34 are both opened, and the power of the power pump 42 of the outdoor cooling unit 4 is increased to 2p, and the cold air and the coolant flow into the lower air cooling channel 1217 and the upper liquid cooling channel 1216 from the air inlet 1211 and the liquid inlet 1212 respectively; the cold air and the coolant perform convective heat exchange with the lower air cooling channel 1217 and the upper liquid cooling channel 1216 respectively; after the heat exchange is completed, the cold air and the coolant flow out from the air outlet 1214 and the liquid outlet 1215 respectively, taking away the heat at the same time.

[0077] S12: Collect T1, T2, T3 and T4 and calculate ∆T 3-1 , ∆T 4-2 The control unit 5 collects the gas temperature T1 at the gas inlet 1211 and the gas temperature T3 at the gas outlet 1214 of the gas-liquid heat pipe module, the liquid temperature T2 at the liquid inlet 1212 and the liquid temperature T4 at the liquid outlet 1215, and calculates the temperature difference ∆T 3-1 = T3- T1, ∆T 4-2 = T4- T2.

[0078] S13: Determine the temperature difference ∆T 3-1 , ∆T 4-2 Are they less than the minimum allowable value T of the gas? combine-air Minimum allowable liquid value T combine-Liquid If yes, return to S6; if no, return to S12.

[0079] S14: End: The air compressor 21 and the power pump 32 stop running, the air cooling control valve 23 and the liquid cooling control valve 34 are both closed, and the power pump of the outdoor cooling unit 4 stops working. The data center air-liquid cooling system ends one working process.

[0080] The preferred values ​​of the judgment conditions in this embodiment are:

[0081] Air cooling mode: T Air-1(max) The maximum allowable gas temperature difference is set to 8~10℃, preferably 9℃.

[0082] Liquid cooling mode: T Liquid-1（max） The maximum allowable liquid temperature difference is set to 8~10℃; preferably 9℃.

[0083] T Liquid-2（min） The minimum allowable value of liquid temperature difference is set to: 3~5℃; preferably 4℃.

[0084] Gas-liquid collaborative cooling mode:

[0085] T combine-airIt is the minimum allowable value of gas, set to 7-9℃, preferably 8℃.

[0086] T combine-Liquid It is the minimum allowable value for liquid, set to 5-7°C, preferably 6°C.

[0087] Setting the above judgment conditions produces the following results:

[0088] (1) When evaluating from the perspective of data center gas-liquid cooling system equipment, T Air-1(max) The larger the value, the Liquid-1（max） With T Liquid-2（min） The larger the difference, the greater the combine-air and T combine-Liquid The smaller the value, the wider the server CPU cooling power range corresponding to each cooling mode, avoiding frequent switching of cooling modes, that is, avoiding frequent start-up and shutdown of various components in the data center gas-liquid cooling system, and extending its service life; T Air-1(max) The smaller the value, the Liquid-1（max） With T Liquid-2（min） The smaller the difference, the combine-air and T combine-Liquid The larger the value, the more precise the control of the server CPU operating temperature.

[0089] (2) When evaluating from the perspective of energy saving of the data center gas-liquid cooling system, T Air-1(max) 、T Liquid-1（max） 、T Liquid-2（min） 、T combine-air and T combine-Liquid The larger the value, the more likely it is that the system will switch to a high-heat-dissipation cooling mode only when the low-heat-dissipation cooling mode is about to fail to meet the server CPU's heat dissipation needs, or will switch to this mode as soon as the server CPU's heat dissipation needs are met in the low-heat-dissipation cooling mode. In this case, the data center's air-liquid cooling system will have a better energy-saving effect. However, when the server's operating load fluctuates greatly, the server CPU's operating temperature may approach the limit temperature.

[0090] The above embodiments are preferred implementation modes of the present invention, but the implementation modes of the present invention are not limited to the embodiments. Any other changes, modifications, substitutions, combinations, and simplifications that do not deviate from the spirit and principles of the present invention should be considered as equivalent replacement methods and are included in the scope of protection of the present invention.

Claims

1. A control method based on a gas-liquid cooling system in a data center, characterized in that: The data center gas-liquid cooling system includes a gas-liquid cooling heat pipe module, an air cooling unit, a liquid cooling unit, an outdoor cooling unit and a control unit. The gas-liquid cooling heat pipe module is arranged on the server to be cooled, the air cooling unit and the liquid cooling unit are respectively connected to the gas-liquid cooling heat pipe module, the outdoor cooling unit is respectively connected to the air cooling unit and the liquid cooling unit, and the control unit is respectively connected to the air cooling unit, the liquid cooling unit and the outdoor cooling unit, and is used to realize the air cooling mode, the liquid cooling mode and the gas-liquid coordinated cooling mode according to the temperature of the inlet and outlet liquid and / or gas of the gas-liquid cooling heat pipe module; Control methods include the following: After the cooling server is started, the air-liquid cooling system of the data center is started; Start air cooling mode; The control unit collects the gas temperature at the air inlet and the gas temperature at the air outlet of the gas-liquid heat dissipation heat pipe module to obtain the gas temperature difference; Determine whether the gas temperature difference is greater than T Air-1(max) If yes, proceed to the next step to start the liquid cooling mode, otherwise execute the step of determining the gas temperature difference; Start the liquid cooling mode and stop the air cooling mode; The control unit collects the liquid temperature at the liquid inlet and the liquid outlet of the gas-liquid heat pipe module and calculates the liquid temperature difference; Determine whether the liquid temperature difference is greater than T Liquid-1（max） If it is greater than, the next step is to start the gas-liquid coordinated cooling mode, otherwise, the step of determining the liquid temperature difference is executed; Start the gas-liquid collaborative cooling mode, with the air cooling unit and liquid cooling unit running simultaneously; The control unit obtains the gas temperature difference between the gas inlet and outlet and the liquid temperature difference between the liquid inlet and outlet of the gas-liquid heat pipe module; Determine whether the gas temperature difference and liquid temperature difference are both less than the set T combine-air , T combine-Liquid If so, the liquid cooling mode is started, otherwise the gas temperature difference and liquid temperature difference of the gas-liquid heat pipe module are continued to be collected.

2. The control method according to claim 1, characterized in that: In the air cooling mode, the step of determining the gas temperature difference includes: determining whether the gas temperature difference is less than T within the set time. Air-2(min) If yes, stop the cooling system; otherwise, return to the step of collecting the gas temperature at the air inlet and the gas temperature at the air outlet of the gas-liquid cooling heat pipe module.

3. The control method according to claim 1, wherein: In the liquid cooling mode, the step of determining the liquid temperature difference includes: determining whether the liquid temperature difference is less than T Liquid-2（min） If yes, stop the liquid cooling mode and start the air cooling mode. If no, return to the step of collecting the liquid temperature at the liquid inlet and outlet.

4. The control method according to claim 2, characterized in that: Air cooling mode: T Air-1(max) The maximum allowable gas temperature difference is set to 8~10℃; Liquid cooling mode: T Liquid-1（max） The maximum allowable value of liquid temperature difference is set to: 8~10℃; T Liquid-2（min） The minimum allowable value of liquid temperature difference is set to: 3~5℃; Gas-liquid collaborative cooling mode: T combine-air The minimum allowable value for gas is set to 7-9°C. T combine-Liquid It is the minimum allowable value for liquid and is set to 5-7℃.

5. The control method according to any one of claims 2 to 4, characterized in that: The gas-liquid collaborative cooling mode is specifically: The air compressor and the power pump work at the same time, the liquid cooling control valve and the air cooling control valve are both opened, and the power pump power of the outdoor cooling unit is increased to 2p, and the cold air and the coolant flow into the air cooling flow channel and the liquid cooling flow channel from the air inlet and the liquid inlet respectively; the cold air and the coolant perform convective heat exchange with the air cooling flow channel and the liquid cooling flow channel respectively; after completing the heat exchange, the cold air and the coolant flow out from the air outlet and the liquid outlet respectively, taking away the heat at the same time.

6. The control method according to claim 1, characterized in that: The air cooling unit includes an air compressor, an air storage tank, an air cooling control valve, an air cooling filter, an air cooling plate heat exchanger, a gas flow meter and an air cooling temperature sensor for monitoring the gas temperature at the air inlet and outlet of the gas-liquid heat dissipation heat pipe module.

7. The control method according to claim 1, characterized in that: The liquid cooling unit includes a liquid storage tank, a power pump, a liquid cooling filter, a liquid cooling control valve, a liquid flow meter, a liquid cooling plate heat exchanger and a liquid cooling temperature sensor for monitoring the liquid temperature at the liquid inlet and outlet of the gas-liquid heat dissipation heat pipe module.

8. The control method according to claim 1, 6 or 7, characterized in that: The gas-liquid heat dissipation heat pipe module includes a heat pipe heat conduction unit and a heat exchange unit. The heat pipe heat conduction unit includes a heat sink and a heat pipe; the heat exchange unit includes a gas-liquid cold plate and a sealing plate cover.

9. The control method according to claim 8, characterized in that: The air-liquid cold plate includes two layers of flow channels, namely air cooling flow channels and liquid cooling flow channels. The two layers of flow channels are symmetrically distributed up and down and are not connected to each other.

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