Two-phase liquid cooling system for data center and control method

Abstract

The invention belongs to the field of temperature control equipment for data centers, and discloses a two-phase liquid cooling system for a data center and a control method, and the system comprises a liquid cooling module which is used for carrying out the heat dissipation of a server core device (COU / GPU); the air cooling module is used for cooling other devices (a memory, a hard disk and the like) of the server; the cold supplementing module is used for carrying out supplementary heat dissipation on other devices (a memory, a hard disk and the like) of the server; and the central controller is connected with the liquid cooling module, the air cooling module and the cold supplementing module and is used for carrying out centralized acquisition and control. Water cannot enter the machine room, and the safety of the liquid cooling data center is improved; aiming at the problem that two refrigerants are easy to distribute unevenly, a corresponding control method is provided, and accurate temperature control and flow control are carried out on each tail end; the corresponding control method is provided, and effective cold supplement is achieved.

Description

Technical Field

[0001] The present invention belongs to but is not limited to the field of temperature control equipment for data centers, and in particular relates to a two-phase liquid cooling system and a control method for data centers. Background Art

[0002] The main component of the coolant used in the current liquid cooling system is water. As a coolant, water has the advantages of good thermal conductivity, low cost and easy access. Therefore, it is widely used in data centers, server cabinets and high-performance computing equipment to efficiently remove the heat generated by the main heat-generating components in the server (such as CPU, GPU, etc.).

[0003] Existing liquid cooling systems generally use a design where cooling water directly enters the computer room, cabinets, and servers. The cooling water flows inside the equipment and directly exchanges heat with key heat-generating components, thereby achieving efficient heat dissipation. However, although this design can improve heat dissipation efficiency, it also makes the cooling water directly contact with electronic components, which increases potential risks.

[0004] Since the main component of the coolant is water, once the liquid cooling system leaks, the water may enter the computer room environment and the server, causing serious safety accidents. Common risks include short circuits in the server's internal circuits, corrosion or even burning of electronic components due to moisture, and circuit breaks in electrical cabinets. These safety hazards may not only cause equipment damage, but also lead to more serious consequences such as data center downtime and fire.

[0005] In response to the safety risks brought by leakage of liquid cooling systems, existing technologies have made certain improvements in system sealing, leakage monitoring and protective measures. For example, some systems use efficient sealing design and real-time monitoring technology to detect and control leaks at an early stage. However, due to the physical properties of the cooling water itself and the design features of directly flowing into the cabinet and server, these improvement measures still have certain limitations when facing extreme environments and unexpected situations. Therefore, how to further reduce the safety risks of the liquid cooling system while ensuring efficient heat dissipation is still an important issue that needs to be solved in liquid cooling technology. Summary of the invention

[0006] In view of the problems existing in the prior art, the present invention provides a two-phase liquid cooling system and a control method for a data center.

[0007] The present invention is implemented as follows: a two-phase liquid cooling system for a data center, the system comprising:

[0008] The liquid cooling module uses refrigerant circulation internally and is anhydrous. Valves VAA, fluorine pump PA, plate heat exchanger HEXA, valves VAB and VAC, and V1 to VN at the end form a liquid cooling cycle. Cold plates 1 to n are deployed on the CPUs / GPUs inside the server for heat dissipation. When the circulating refrigerant flows through the cold plates, it can take away heat from the CPUs / GPUs. TAA is the liquid cooling supply temperature sensor. TBB is the liquid cooling return temperature sensor. Ta1 to Tan are the cold plate outlet temperature sensors. Pa1 to Pan are the cold plate outlet pressure sensors. V1 to VN are flow regulating valves for regulating the refrigerant flow into each cold plate.

[0009] The air cooling module uses refrigerant circulation internally and is anhydrous. Valves VAB, compressor C, plate heat exchanger HEXB, and fluorine pump PB form a refrigerant cycle. VBB is a refrigerant bypass valve used to bypass the compressor C when the ambient temperature is low and enters the fluorine pump circulation mode. VBD is a flow regulating valve. TBA is the air cooling supply temperature sensor. TBB is the air cooling return temperature sensor. PBA is the air cooling supply pressure sensor. PBB is the air cooling return pressure sensor. The end air conditioner evaporators A to N are end heat exchangers that can be freely combined and configured. Users can freely configure according to the number of ends.

[0010] The supplementary cooling module consists of valve VBC and HEXC.

[0011] The central controller is connected to the liquid cooling module, air cooling module, and supplementary cooling module for centralized data collection and control.

[0012] Furthermore, the control process of the liquid cooling module specifically includes:

[0013] (1) After the liquid cooling module starts, the control targets are the liquid cooling supply temperature, liquid cooling supply pressure difference, and the superheat degree of each cold plate.

[0014] (2) The liquid cooling supply temperature comes from sensor TAA. When the supply temperature TAA is greater than the set value, valve VAA opens wider. When TAA is lower than the set value, valve VAA closes smaller.

[0015] (3) The liquid cooling supply pressure difference comes from the difference between pressure sensors PAA and PAB. When the supply pressure difference is lower than the set value, fluorine pump PA increases its frequency. When the supply pressure difference is higher than the set value, fluorine pump PA decreases its frequency. When fluorine pump PA is already running at the lowest frequency but the supply pressure difference is still higher than the set value, valve VAC opens. When fluorine pump PA is already running at the lowest frequency and the supply pressure difference is lower than the set value, valve VAC closes to 0, and then fluorine pump PA increases its frequency.

[0016] (4) Cold plate superheat, from temperature sensors Ta1 to Tan and Pa1 to Pan; for example, the superheat of cold plate 1 is calculated by corresponding the pressure of Pa1 to obtain the saturation temperature and subtracting this saturation temperature from the value of Ta1;

[0017] When the superheat of the cold plate in a certain branch n is greater than the set value, the valve Vn of the corresponding branch opens wider; when the superheat of the cold plate in a certain branch n is less than the set value, the valve Vn of the corresponding branch closes smaller;

[0018] The above control process can achieve precise control of the refrigerant flow rate in each branch, effectively avoiding problems such as overheating caused by excessive evaporation of the refrigerant in the cold plate.

[0019] Furthermore, the control process of the air-cooled module specifically includes:

[0020] S1: After the air-cooled module is started, the control targets are condensation pressure, evaporation pressure, and suction superheat;

[0021] S2: The condensation pressure comes from the sensor PBA. When the condensation pressure PBA is higher than the set value, the valve VBA opens wider; when PBA is lower than the set value, the valve VBA closes smaller;

[0022] S3: The evaporation pressure comes from the sensor PBB. When the evaporation pressure PBB is lower than the set value, the compressor C reduces its frequency; when PBB is higher than the set value, the compressor C increases its frequency;

[0023] S4: The suction superheat comes from the difference between TBB and PBB. When the suction superheat is lower than the set value, VBD opens wider; when the suction superheat is higher than the set value, VBD decreases;

[0024] The above control process gets rid of the problem of communication linkage between the host module and the terminal module in the past and realizes the independent control of the host module; users can freely increase or decrease the terminal modules according to the scenario requirements.

[0025] Furthermore, the control process of the supplementary cooling module specifically includes:

[0026] When the external environment is too high, it will be detected that VAA is at the maximum opening, and the temperature TAA of the liquid-cooled water supply port is higher than the set value and cannot be reduced anymore; at this time, open the valve VBC to provide cooling capacity to the plate heat exchanger HEXC to realize the supplementary cooling process from the air-cooled module to the liquid-cooled module.

[0027] Another object of the present invention is to provide a control method for a two-phase liquid cooling system for a data center based on the two-phase liquid cooling system for a data center, and this method specifically includes:

[0028] S21: Liquid cooling part, adopting the flow distribution control of a two-phase flow system. The present invention provides a specific control method to achieve the precise distribution of two-phase flow refrigerant to the end servers;

[0029] S22: Air cooling part, adopting the architecture of host + end air conditioner to achieve flexible configuration of the supplementary cooling end;

[0030] S23: Supplementary cooling part, providing a supplementary cooling module; when the system is in an extremely high temperature environment and the liquid cooling capacity is insufficient, the air cooling part can perform supplementary cooling actions to ensure the normal operation of the core components (CPU / GPU) of the server;

[0031] S24: Related control of the whole system, integrated in the controller, which is convenient to achieve the optimal effect through linkage control in various environmental scenarios.

[0032] Another object of the present invention is to provide a computer device, which includes a memory and a processor. When the computer program stored in the memory is executed by the processor, the processor executes the steps of the control method of the two-phase liquid cooling system for the data center.

[0033] Another object of the present invention is to provide a computer-readable storage medium storing a computer program, which when executed by a processor, causes the processor to execute the steps of the control method of the two-phase liquid cooling system for the data center.

[0034] Another object of the present invention is to provide an information data processing terminal, which is used to implement the two-phase liquid cooling system for the data center.

[0035] Combined with the above technical solutions and the solved technical problems, the advantages and positive effects of the technical solutions to be protected by the present invention are as follows:

[0036] First, the present invention provides a two-phase liquid cooling system and a control method. In this system, the circulating coolant is a refrigerant, not water. The refrigerant is an insulating and volatile substance. When the liquid cooling system operates, if there is a leak, it will not cause the risk of open circuit to the server and the computer room.

[0037] At the same time, based on the characteristics of two-phase liquid cooling, the present invention provides relevant system architectures and control methods.

[0038] The present invention provides a two-phase liquid cooling system, which can be used in liquid-cooled data computer rooms, effectively avoiding the risks caused by water entering the computer room and the server.

[0039] Based on the two-phase liquid cooling system architecture of the present invention, the present invention provides a corresponding control method, which can achieve precise flow distribution to the cabinets and servers.

[0040] The present invention provides a built-in supplementary cooling module and a control method, which can effectively distribute the cooling capacity between air cooling and liquid cooling, and realize the compensation for the liquid cooling part in extreme environments.

[0041] The creativity of the present invention lies in:

[0042] The present invention provides a two-phase liquid cooling system and a control method thereof, which can prevent water from entering the computer room and improve the safety of the liquid-cooled data center.

[0043] For the problem that the two-phase refrigerant is prone to uneven distribution in the liquid cooling system architecture provided by the present invention, a corresponding control method is provided to achieve precise temperature control and flow control for each end.

[0044] The supplementary cooling module architecture provided by the present invention effectively connects the liquid cooling module and the air cooling module, and provides a corresponding control method to achieve effective supplementary cooling.

[0045] For the air cooling module architecture provided by the present invention, a specific control method is provided to achieve flexible configuration of the supplementary cooling end.

[0046] Second, the technical solution of the present invention uses a refrigerant instead of water to dissipate heat from the server. The refrigerant has the characteristics of insulation and volatility, fundamentally eliminating the risks of server short circuit and burnout caused by leakage of the liquid cooling system. It can greatly improve the applicability and safety of the liquid cooling system, and has great value for promoting the liquid cooling temperature control technology in data centers.

[0047] The technical solution of the present invention solves the problem of water entering the computer room in liquid cooling technology. It uses a refrigerant instead of water to dissipate heat from the end servers. This technical solution can make full use of the latent heat of phase change of the refrigerant to dissipate heat from the high-power devices of the server, and can greatly improve the heat dissipation capacity.

[0048] At the same time, by adding control components and optimizing the control logic in the system, the problem of uneven flow distribution of the two-phase refrigerant is solved.

[0049] In this technical solution, by adding a supplementary cooling module, the effective connection between the air cooling part and the liquid cooling part is realized. Under extreme environmental conditions, when the liquid cooling heat dissipation is insufficient, supplementary cooling can be used to achieve stable control of the liquid cooling heat dissipation in harsh environments. Brief Description of the Drawings

[0050] Figure 1 It is a structural diagram of a two-phase liquid cooling system for a data center provided by an embodiment of the present invention;

[0051] Figure 2 It is a flowchart of the control process method of the air cooling module provided by an embodiment of the present invention;

[0052] Figure 3It is a flowchart of the control method for a two-phase liquid cooling system used in a data center provided by an embodiment of the present invention.

[0053] Figure 4 It is a schematic diagram of the architecture of a two-phase liquid cooling data center computer room according to an embodiment of the present invention. Detailed implementation manners

[0054] In order to make the objectives, technical solutions and advantages of the present invention clearer, the present invention will be further described in detail below with reference to embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0055] As Figure 1 shown, an embodiment of the present invention provides a two-phase liquid cooling system for a data center. The system includes:

[0056] A liquid cooling module that uses a refrigerant to circulate internally and is anhydrous; valves VAA, fluorine pump PA, plate heat exchanger HEXA, valves VAB and VAC, and V1 to VN at the end form a liquid cooling cycle; cold plates 1 to n are deployed on the CPU / GPU inside the server for heat dissipation; when the circulating refrigerant flows through the cold plates, it can take away heat from the CPU / GPU; TAA is a liquid cooling supply temperature sensor; TBB is a liquid cooling return temperature sensor; Ta1 to Tan are cold plate outlet temperature sensors; Pa1 to Pan are cold plate outlet pressure sensors; V1 to VN are flow regulating valves for adjusting the refrigerant flow rate into each cold plate;

[0057] An air cooling module that uses a refrigerant to circulate internally and is anhydrous; valves VAB, compressor C, plate heat exchanger HEXB, and fluorine pump PB form a refrigerant cycle; VBB is a refrigerant bypass valve used to bypass the compressor C when the ambient temperature is low and enters the fluorine pump circulation mode. VBD is a flow regulating valve; TBA is an air cooling supply temperature sensor; TBB is an air cooling return temperature sensor; PBA is an air cooling supply pressure sensor; PBB is an air cooling return pressure sensor; the end air conditioner evaporators A to N are end heat exchangers that can be freely combined and configured. Users can freely configure according to the number of ends;

[0058] A supplementary cooling module composed of valves VBC and HEXC;

[0059] A central controller is connected to the liquid cooling module, air cooling module, and supplementary cooling module for centralized collection and control.

[0060] The control process of the liquid cooling module specifically includes:

[0061] (1) After the liquid cooling module is started, the control targets are the liquid cooling supply temperature, liquid cooling supply pressure difference, and superheat of each cold plate;

[0062] (2) The liquid cooling supply temperature comes from the sensor TAA. When the supply temperature TAA is greater than the set value, the valve VAA opens wider; when TAA is lower than the set value, the valve VAA closes smaller;

[0063] (3) The liquid cooling supply pressure difference comes from the difference between the pressure sensors PAA and PAB. When the supply pressure difference is lower than the set value, the fluorine pump PA increases its frequency. When the supply pressure difference is higher than the set value, the fluorine pump PA decreases its frequency; when the fluorine pump PA is already operating at the lowest frequency, but the supply pressure difference is still higher than the set value, the valve VAC opens; when the fluorine pump PA is already operating at the lowest frequency and the supply pressure difference is lower than the set value, the valve VAC closes to 0, and then the fluorine pump PA increases its frequency;

[0064] (4) The cold plate superheat comes from the temperature sensors Ta1~Tan and Pa1~Pan; for example, the superheat calculation of cold plate 1 is to obtain the saturation temperature corresponding to the pressure of Pa1, and subtract this saturation temperature from the value of Ta1;

[0065] When the superheat of the cold plate in a certain branch n is greater than the set value, the valve Vn in the corresponding branch opens wider; when the superheat of the cold plate in a certain branch n is less than the set value, the valve Vn in the corresponding branch closes smaller;

[0066] The above control process can achieve precise control of the refrigerant flow rate in each branch, and can effectively avoid problems such as overheating caused by excessive evaporation of the refrigerant in the cold plate.

[0067] As Figure 2 shown, the control process of the air-cooled module specifically includes:

[0068] S1: After the air-cooled module is started, the control targets are the condensing pressure, evaporation pressure, and suction superheat;

[0069] S2: The condensing pressure comes from the sensor PBA. When the condensing pressure PBA is higher than the set value, the valve VBA opens wider; when PBA is lower than the set value, the valve VBA closes smaller;

[0070] S3: The evaporation pressure comes from the sensor PBB. When the evaporation pressure PBB is lower than the set value, the compressor C reduces its frequency; when PBB is higher than the set value, the compressor C increases its frequency;

[0071] S4: The suction superheat comes from the difference between TBB and PBB. When the suction superheat is lower than the set value, VBD opens wider; when the suction superheat is higher than the set value, VBD decreases;

[0072] The above control process gets rid of the problem of communication linkage between the host module and the terminal module in the past, and realizes the independent control of the host module; users can freely increase or decrease the terminal modules according to the scene requirements.

[0073] The control process of the supplementary cooling module specifically includes:

[0074] When the external environment is too high, it is detected that VAA is at the maximum opening degree, and the temperature TAA of the liquid-cooling water supply port is higher than the set value and cannot be reduced any further. At this time, valve VBC is opened to provide cooling capacity to heat exchanger HEXC, thereby realizing the supplementary cooling process from the air-cooling module to the liquid-cooling module.

[0075] As Figure 3 shown, an embodiment of the present invention provides a control method for a two-phase liquid-cooling system for a data center based on the two-phase liquid-cooling system for the data center. The method specifically includes:

[0076] S21: For the liquid-cooling part, flow distribution control of the two-phase flow system is adopted. The present invention provides a specific control method, which can achieve precise distribution of the two-phase flow refrigerant to the end servers;

[0077] S22: For the air-cooling part, the architecture of the host + end air conditioner is adopted to realize flexible configuration of the supplementary cooling end;

[0078] S23: For the supplementary cooling part, a supplementary cooling module is provided. When the system is in an extremely high-temperature environment and the liquid-cooling capacity is insufficient, the air-cooling part can perform a supplementary cooling operation on it to ensure the normal operation of the core components (CPU / GPU) of the server;

[0079] S24: The relevant control of the whole system is integrated in the controller, which is convenient to achieve the optimal effect through linkage control in various environmental scenarios.

[0080] The present invention provides a control method for a two-phase liquid-cooling system for a data center. The method integrates three major parts: liquid cooling, air cooling, and supplementary cooling. Through integrated control of the whole system, precise regulation of cold quantity distribution and temperature management is achieved in various environmental scenarios, thereby ensuring the normal operation of the core components (such as CPU / GPU) of the servers in the data center.

[0081] In the liquid-cooling part, the system adopts the flow distribution control technology of the two-phase flow system. The present invention provides a specific control method, which can achieve precise distribution of the two-phase flow refrigerant to the end servers, ensure that the liquid-cooling capacity can accurately cover each key heat dissipation area, improve the heat dissipation efficiency and reduce potential safety hazards.

[0082] The air-cooling part adopts the architecture design of the host plus the end air conditioner. This architecture supports flexible configuration of the supplementary cooling end. When the system needs additional cold quantity support, the air-cooling part can quickly respond according to the actual situation and perform a supplementary cooling operation, thereby cooperating with the liquid-cooling part to achieve overall efficient heat dissipation.

[0083] In response to the insufficient liquid cooling capacity in extreme high-temperature environments, the present invention configures a dedicated supplementary cooling module in the system. This module can supplement cooling capacity through the air-cooling part when needed, ensuring that the temperatures of the key components of the server (such as CPU / GPU) always remain within a safe range and ensuring the stable operation of the device.

[0084] All liquid cooling, air cooling, and supplementary cooling modules are uniformly managed by an integrated controller. This controller adjusts the operating parameters of each module in real time according to different environmental scenarios and system operating states, realizing linkage control to achieve the optimal heat dissipation effect and energy efficiency balance, and further improving the security and reliability of the entire data center system.

[0085] Figure 4 Schematic diagram of the two-phase liquid cooling data center computer room architecture according to an embodiment of the present invention.

[0086] The two-phase liquid cooling data center architecture provided by the present invention uses a power CDU (Coolant Distribution Unit) as the central cooling unit. The power CDU is installed outside the server computer room (such as in an equipment compartment or outdoors) to ensure the independent circulation of the coolant, avoid direct entry of cooling water into the computer room, and enhance the security and reliability of the data center. The CDU is responsible for circulating, pressure regulating, and temperature controlling the refrigerant A and refrigerant B, and dynamically allocating cooling resources according to the heat load requirements of the computer room.

[0087] This system uses two coolant media, namely refrigerant A and refrigerant B.

[0088] Refrigerant A: Flows through the cold plates inside the server to perform efficient direct liquid cooling on the main power components (such as CPU, GPU).

[0089] Refrigerant B: Flows through the fin heat exchanger inside the server cabinet to dissipate heat through air cooling, enhancing the thermal management ability of the entire cabinet.

[0090] The design of this dual-refrigerant system can effectively balance the heat dissipation requirements of different server components, reduce the safety hazards of cooling water entering the computer room, and improve the adaptability and stability of the liquid cooling system.

[0091] The power CDU can not only provide cold plate liquid cooling but also support air cooling, and can achieve integrated control and dynamic coordinated allocation of the two cooling methods.

[0092] Intelligent cooling capacity regulation: The CDU can dynamically adjust the cooling capacity ratio of liquid cooling and air cooling according to the real-time heat load of the server to ensure the optimization of cooling efficiency.

[0093] Real-time monitoring and feedback: The system uses temperature and pressure sensors to monitor the heat distribution in the computer room and optimize the flow rate and pressure of the coolant in real time to improve energy utilization efficiency.

[0094] Compared with the traditional single cold plate liquid cooling solution, this temperature control system has higher flexibility and adaptability, and can provide a better heat dissipation solution under different working load conditions.

[0095] Both the liquid-cooled cabinets in the data center (such as liquid-cooled cabinet A and liquid-cooled cabinet B) are equipped with server cold plates and finned heat exchangers, which are used for liquid cooling and air cooling respectively.

[0096] Dynamic regulation of refrigerant flow: Dynamic regulation valves are added to each cooling circuit, which can accurately control the refrigerant flow according to the real-time power consumption and heat dissipation requirements of the server, ensuring that high-load servers obtain more efficient cooling capacity.

[0097] Distributed flow optimization: The system can dynamically adjust the cooling resource allocation between different cabinets and server nodes, enabling stronger cooling capacity in high-heat load areas, while reducing the refrigerant flow in low-load areas and improving the overall cooling efficiency.

[0098] Traditional data center cooling methods usually adopt single air cooling or liquid cooling. The innovation of this invention lies in achieving the collaborative optimization of air cooling and liquid cooling:

[0099] Dynamic switching: When the server heat load is low, the system can reduce the liquid cooling flow, increase the proportion of air cooling, and reduce energy consumption; in the high-load mode, liquid cooling is preferentially used for efficient heat dissipation to ensure the stable operation of the equipment.

[0100] Fault redundancy: When the liquid cooling system fails or is under maintenance, the air cooling system can temporarily undertake part of the heat dissipation task, improving the safety and stability of the system.

[0101] The technologies adopted in this invention, such as the dual refrigerant architecture, intelligent CDU temperature control system, and dynamic refrigerant flow control, have significantly improved the heat dissipation efficiency and energy-saving ability of the data center:

[0102] Prevent cooling water from entering the computer room, reduce the risk of water leakage, and improve the safety of equipment.

[0103] Intelligently regulate cooling resources, adjust the ratio of liquid cooling and air cooling according to real-time needs, and reduce unnecessary energy consumption.

[0104] Adapt to different load scenarios, and can be widely applied to high-heat power consumption environments such as high-density computing centers, cloud computer rooms, and AI training server clusters, providing an efficient and stable heat dissipation solution for the data center.

[0105] As described above, it is only the specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention, any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be covered by the protection scope of the present invention.

Claims

1. A two-phase liquid cooling system for a data center, characterized in that: The system includes: A liquid cooling module, in which a refrigerant circulates and does not contain water, wherein the liquid cooling module is provided with a valve VAA, a fluorine pump PA, a plate exchanger HEXA, a valve VAB, a valve VAC, and a liquid cooling circulation loop consisting of terminal flow regulating valves V1 to VN; A group of cold plates, numbered from cold plate 1 to cold plate n, are arranged near the CPU / GPU inside the server; The temperature sensor TAA is used to detect the liquid cooling supply temperature, the liquid cooling return temperature sensor TBB is used to detect the liquid cooling return temperature, the cold plate outlet temperature sensors Ta1 to Tan and the cold plate outlet pressure sensors Pa1 to Pan are used to detect the status of each cold plate; An air-cooling module, which uses a refrigerant circulation and does not contain water. The air-cooling module is provided with a valve VAB, a compressor C, a plate exchanger HEXB, a fluorine pump PB, a refrigerant bypass valve VBB, a flow regulating valve VBD, an air-cooling liquid supply temperature sensor TBA, an air-cooling liquid return temperature sensor TBB, an air-cooling liquid supply pressure sensor PBA, an air-cooling liquid return pressure sensor PBB and terminal air-conditioning evaporators A to N; A supplementary cooling module, consisting of valve VBC and plate exchanger HEXC; A central controller is connected to the liquid cooling module, the air cooling module and the supplementary cooling module.

2. The two-phase liquid cooling system according to claim 1, characterized in that: The liquid cooling module is provided with a temperature detection unit, which is connected to the temperature sensor TAA and is used to collect liquid cooling supply temperature information.

3. The two-phase liquid cooling system according to claim 1, characterized in that: A pressure detection unit is provided in the liquid cooling module, and the pressure detection unit is connected to the pressure sensors PAA and PAB for collecting the liquid cooling supply pressure signal.

4. The two-phase liquid cooling system according to claim 1, characterized in that: The liquid cooling module is provided with a temperature and pressure detection unit, which is connected to the cold plate outlet temperature sensors Ta1 to Tan and the cold plate outlet pressure sensors Pa1 to Pan to detect the state parameters at each cold plate.

5. The two-phase liquid cooling system according to claim 1, characterized in that: The air cooling module is provided with a control unit, which is connected to the refrigerant bypass valve VBB, the flow regulating valve VBD, the compressor C, the temperature sensors TBA and TBB, and the pressure sensors PBA and PBB.

6. The two-phase liquid cooling system according to claim 1, characterized in that: The cooling supplement module is composed of a cooling supplement unit, which is composed of a valve VBC and a plate exchanger HEXC, and is connected to the liquid cooling module and the air cooling module through a central controller.

7. A control method for a two-phase liquid cooling system for a data center, characterized in that: The method comprises the following steps: S1: After the liquid cooling module is started, the liquid cooling supply temperature, the liquid cooling supply pressure difference (detected by pressure sensors PAA and PAB), and the outlet temperature and pressure of each cold plate are collected; S2: adjusting the opening of the valve VAA according to the liquid cooling supply temperature value, adjusting the frequency of the fluorine pump PA according to the liquid cooling supply pressure difference signal, and adjusting the opening of the flow regulating valves V1 to VN in the corresponding branches according to the difference between the temperature at each cold plate and the saturation temperature corresponding to the cold plate outlet pressure; S3: After starting the air cooling module, the condensing pressure, evaporating pressure and suction superheat are collected, and the valve VBA, the operating frequency of the compressor C and the opening of the valve VBD are adjusted according to the collected values; S4: When it is detected in the liquid cooling module that the liquid cooling supply temperature exceeds the preset value and the valve VAA is at the maximum opening, the valve VBC is opened to supply refrigerant to the plate exchanger HEXC; S5: The collected signals and control instructions of the liquid cooling module, the air cooling module and the supplementary cooling module are centrally processed and linked to each other through the central controller.

8. The control method according to claim 7, characterized in that: In step S1, the collected values ​​of each cold plate outlet temperature and each cold plate outlet pressure are processed to obtain the superheat of each cold plate, which is the difference between each cold plate outlet temperature and its corresponding saturation temperature determined by the cold plate outlet pressure.

9. The control method according to claim 7, characterized in that: In step S3, by collecting signals of condensing pressure, evaporating pressure and suction superheat, the operating frequency of the compressor C and the openings of the valves VBA and VBD are adjusted to control the refrigerant circulation parameters in the air cooling module.

10. The control method according to claim 7, characterized in that: In step S4, when the liquid cooling supply temperature exceeds a preset value and the valve VAA is at the maximum opening, the valve VBC is opened to establish a refrigerant passage between the plate exchanger HEXC and the air cooling module.

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