Control method of liquid cooling system, storage medium, electronic device and computer program product

Abstract

The embodiment of the invention provides a control method of a liquid cooling system, a storage medium, an electronic device and a computer program product, and the method comprises the steps: determining a current operation mode of the liquid cooling system as a constant pressure difference control mode, and obtaining a supply and return hydraulic pressure difference value between liquid supply pressure and liquid return pressure in the constant pressure difference control mode; switching the constant pressure difference control mode into a constant temperature difference control mode according to the supply and return hydraulic pressure difference value and a preset first control mode switching condition; and in the constant-temperature-difference control mode, the liquid supply and return flow is adjusted so as to adjust the liquid supply and return temperature difference value between the liquid supply temperature and the liquid return temperature, and the constant-temperature-difference control mode is switched into the constant-pressure-difference control mode according to the adjusted liquid supply and return temperature difference value and a preset second control mode switching condition. The problems of energy waste in low load and insufficient heat dissipation in high load due to the fact that a liquid cooling system cannot intelligently adapt to the load change of the equipment to be cooled in a constant pressure difference control mode in the prior art are solved.

Description

Technical Field

[0001] Embodiments of the present application relate to the field of communications. Specifically, they relate to a control method, a storage medium, an electronic device, and a computer program product for a liquid cooling system. Background Art

[0002] In recent years, with the booming development of technologies such as big data, the Internet, and artificial intelligence, the demand for high-power computing servers has been increasing day by day. At the same time, the infrastructure of data centers has gradually developed towards large-scale and high-density directions, and the heat generated by data center servers has become larger and larger. The heat dissipation effect of traditional air-cooling technology on high-power density chips has approached its limit, while liquid-cooling technology can better solve the problem of high-density heat dissipation due to its advantages such as high thermal conductivity.

[0003] In the prior art, in the constant pressure difference control mode, the liquid cooling system cannot be intelligently adjusted in the face of large fluctuations in the load of the device to be cooled, resulting in excessive cold supply and low energy efficiency when the device to be cooled has a low load, and insufficient cold supply when the device to be cooled has a high load, leading to overheating of the device to be cooled. Summary of the Invention

[0004] Embodiments of the present application provide a control method, a storage medium, an electronic device, and a computer program product for a liquid cooling system, so as to at least solve the problem that in the prior art, the liquid cooling system cannot intelligently adapt to the load change of the device to be cooled in the constant pressure difference control mode, resulting in energy waste at low load and insufficient heat dissipation at high load.

[0005] According to an embodiment of the present application, a control method for a liquid cooling system is provided, including:

[0006] Determine that the current operating mode of the liquid cooling system is the constant pressure difference control mode, and obtain the pressure difference between the liquid supply pressure and the liquid return pressure in the constant pressure difference control mode; according to the pressure difference between the liquid supply and the liquid return and a preset first control mode switching condition, switch the constant pressure difference control mode to the constant temperature difference control mode; in the constant temperature difference control mode, adjust the liquid supply and return flow rates to adjust the temperature difference between the liquid supply temperature and the liquid return temperature, and according to the adjusted temperature difference between the liquid supply and the liquid return and a preset second control mode switching condition, switch the constant temperature difference control mode to the constant pressure difference control mode.

[0007] According to another embodiment of the present application, a computer-readable storage medium is further provided, in which a computer program is stored, and the computer program is configured to execute the steps in any one of the above method embodiments when running.

[0008] According to another embodiment of the present application, an electronic device is provided, including a memory and a processor, wherein the memory stores a computer program, and the processor is configured to run the computer program to perform the steps in any one of the above method embodiments.

[0009] According to another embodiment of the present application, a computer program product is provided, including a computer program, which implements the steps of any of the above method embodiments when executed by a processor.

[0010] In an embodiment of the present application, by determining that the current operating mode of the liquid cooling system is a constant pressure difference control mode, the supply and return hydraulic pressure difference between the supply pressure and the return pressure in the constant pressure difference control mode is obtained; based on the supply and return hydraulic pressure difference and a preset first control mode switching condition, the constant pressure difference control mode is switched to a constant temperature difference control mode; in the constant temperature difference control mode, the supply and return liquid flow rate is adjusted to adjust the supply and return liquid temperature difference between the supply temperature and the return liquid temperature, and based on the adjusted supply and return liquid temperature difference and a preset second control mode switching condition, the constant temperature difference control mode is switched to a constant pressure difference control mode. This achieves the ability to adjust its operating mode based on real-time changes in the system temperature difference and pressure difference, solves the problem in the related art that the liquid cooling system cannot intelligently adapt to changes in the load of the device to be cooled in the constant pressure difference control mode, resulting in energy waste at low loads and insufficient heat dissipation at high loads, and improves the overall energy efficiency and reliability of the system. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 This is a hardware structure diagram of a computer terminal on which the method embodiment of the present application is run;

[0012] Figure 2 is a diagram of the liquid cooling system architecture according to an embodiment of the present application;

[0013] Figure 3 is another liquid cooling system architecture diagram according to an embodiment of the present application;

[0014] Figure 4 is another liquid cooling system architecture diagram according to an embodiment of the present application;

[0015] Figure 5 is a flow chart of a method for controlling a liquid cooling system according to an embodiment of the present application;

[0016] Figure 6 This is a flow chart of the pressure difference and temperature difference linkage control operation according to an embodiment of the present application;

[0017] Figure 7 This is a flow chart of flow rate and temperature difference linkage control operation according to an embodiment of the present application;

[0018] Figure 8It is a structural block diagram of an electronic device according to an embodiment of the present application. Detailed implementation manners

[0019] In the following, embodiments of the present application will be described in detail with reference to the accompanying drawings and in combination with embodiments.

[0020] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, and do not necessarily need to describe a specific order or sequence.

[0021] In the prior art, when the liquid cooling system operates in the constant pressure difference mode, when the device to be cooled (such as an IT device) is at a low load, the constant pressure difference control often results in an actual operating flow rate higher than the flow rate required by the load of the device to be cooled, causing excessive cold quantity supply, thereby reducing the overall energy efficiency of the system and failing to achieve safe and energy-saving control; while when the device to be cooled is at a high load, the constant pressure difference control often results in an actual operating flow rate lower than the flow rate required by the load of the device to be cooled, causing insufficient cold quantity supply and unable to effectively cool the load of the device to be cooled, thereby leading to the problem of high temperature of the load of the device to be cooled.

[0022] Moreover, when the device to be cooled is at a low load or a high load, if the system set pressure difference value is adjusted manually, there is often a reaction lag and accurate adjustment cannot be achieved, so energy-saving and safety control cannot be achieved, and this limitation restricts the overall energy efficiency and reliability of the system.

[0023] Based on the above existing technical problems, the embodiment of the present application proposes a control method for a liquid cooling system, enabling the liquid cooling system to automatically adjust its working mode according to the real-time change of the load of the device to be cooled without human intervention, so as to achieve better refrigeration efficiency and higher system reliability.

[0024] In the embodiment of the present application, in the constant pressure difference control mode, the liquid cooling system can switch to the constant temperature difference control mode according to the actual demand of the load of the device to be cooled, and thus can make corresponding adjustments according to the change of the temperature difference between the supply and return liquid of the load of the device to be cooled. It not only improves the overall energy efficiency of the system when the device to be cooled is at a low load, but also can increase the cold quantity supply when the device to be cooled is at a high load, avoiding overheating of the IT device, thereby improving the energy efficiency and reliability of the system as a whole. It solves the problem that in the related art, the liquid cooling system cannot intelligently adapt to the load change of the device to be cooled in the constant pressure difference control mode, resulting in energy waste at low load and insufficient heat dissipation at high load.

[0025] The method embodiments provided in the embodiments of the present application can be executed in a mobile terminal, a computer terminal or a similar computing device. Taking running on a computer terminal as an example, Figure 1 It is a hardware structural block diagram of the computer terminal on which the method embodiment of the present application runs. AsFigure 1 As shown, the computer terminal may include one or more ( Figure 1 only one is shown in the figure) processors 102 (the processor 102 may include, but is not limited to, a processing device such as a microprocessor MCU or a programmable logic device FPGA) and a memory 104 for storing data. Among them, the above computer terminal may further include a transmission device 106 for communication functions and an input / output device 108. Those of ordinary skill in the art can understand that Figure 1 the structure shown in the figure is only schematic and does not limit the structure of the above computer terminal. For example, the computer terminal may further include Figure 1 more or fewer components than those shown in the figure, or have a different configuration from Figure 1 that shown in the figure.

[0026] The memory 104 can be used to store computer programs. For example, software programs and modules of application software, such as the computer program corresponding to the control method of the liquid cooling system in the embodiments of the present application. The processor 102 executes various functional applications and data processing by running the computer program stored in the memory 104, that is, implements the above method. The memory 104 may include a high-speed random access memory, and may also include a non-volatile memory, such as one or more magnetic storage devices, flash memory, or other non-volatile solid-state memories. In some instances, the memory 104 may further include a memory remotely disposed relative to the processor 102, and these remote memories may be connected to the computer terminal through a network. Examples of the above network include, but are not limited to, the Internet, an enterprise intranet, a local area network, a computer communication network, and combinations thereof.

[0027] The transmission device 106 is used to receive or send data via a network. Specific examples of the above network may include a wireless network provided by a communication provider of the computer terminal. In one instance, the transmission device 106 includes a network adapter (abbreviated as NIC), which can be connected to other network devices through a base station and thus communicate with the Internet. In one instance, the transmission device 106 may be a radio frequency (abbreviated as RF) module, which is used to communicate with the Internet wirelessly.

[0028] Figure 2 is an architecture diagram of a liquid cooling system according to an embodiment of the present application. The embodiments of the present application can run on Figure 2 the system architecture shown in the figure, such as Figure 2As shown in the figure, the system architecture includes: 201 - primary side pipeline, 202 - heat exchanger, 203 - secondary side pipeline, 204 - IT equipment, 205 - circulation pump, 206 - supply liquid pressure sensor, 207 - supply liquid temperature sensor, 208 - return liquid pressure sensor, 209 - return liquid temperature sensor, 220 - control unit. Among them,

[0029] 201 - primary side pipeline: It can be the primary circulation path of the coolant in the liquid cooling system and can connect to a cold source (such as a cooling tower or a chiller) and a heat exchanger.

[0030] 202 - heat exchanger: It is a heat exchange device (such as a plate heat exchanger). For example, it can establish a thin metal plate between two liquid flows to enable heat exchange between the two fluids without direct contact. In the liquid cooling system, it can be used to perform heat energy conversion between the primary side pipeline and the secondary side pipeline, reducing the temperature of the liquid cooled in the primary side pipeline so as to effectively cool the IT equipment.

[0031] 203 - secondary side pipeline: It can be the secondary circulation path of the coolant in the liquid cooling system, connecting the heat exchanger and the IT equipment respectively. It can be used to transport the coolant that has undergone heat exchange to the IT equipment (such as each server or electronic device) for cooling, and then collect and send back the coolant with increased temperature to the heat exchanger for cooling again.

[0032] 204 - IT equipment: It can be servers or other electronic devices that need to be cooled in the data center and other heat dissipation devices. The IT equipment generates heat during operation and requires a liquid cooling system for cooling.

[0033] 205 - circulation pump: The circulation pump is used to push the coolant to circulate in the pipeline, maintaining the circulation of the coolant in the cooling system to achieve effective heat exchange and cooling.

[0034] 206 - supply liquid pressure sensor: It can be set at the supply end of the secondary side pipeline circulation path and is used to measure the pressure of the coolant before entering the IT equipment.

[0035] 207 - supply liquid temperature sensor: It can be set at the supply end of the secondary side pipeline circulation path and is used to measure the temperature of the coolant before entering the IT equipment.

[0036] 208 - return liquid pressure sensor: It can be set at the return end of the secondary side pipeline circulation path and is used to measure the pressure of the coolant after returning from the IT equipment. It can be used together with the measurement data of the supply liquid pressure sensor to calculate the pressure difference.

[0037] 209 - return liquid temperature sensor: It can be set at the return end of the secondary side pipeline circulation path and is used to measure the temperature of the coolant after returning from the IT equipment. It can be used together with the data of the supply liquid temperature sensor to calculate the temperature difference.

[0038] 220 - Control Unit: It can receive data from the pressure sensor and the temperature sensor, and adjust the opening degree of the circulation pump according to the set control mode (such as constant pressure difference control mode, constant temperature difference control mode, etc.) to ensure that the pressure difference and temperature difference in the liquid cooling system are maintained within the set range, realizing the efficient operation of the liquid cooling system and the temperature control of IT equipment.

[0039] Figure 2 The liquid cooling system architecture can, by monitoring the pressure difference and temperature difference in real time and combining with the change of IT load, intelligently adjust the operating state of the circulation pump, and finally achieve the goals of high energy efficiency and high reliability while meeting the cooling requirements.

[0040] Figure 3 is another liquid cooling system architecture diagram according to the embodiments of the present application. The embodiments of the present application can also run on Figure 3 the system architecture shown, such as Figure 3 shown. The system architecture includes: 301 - primary side pipeline, 302 - heat exchanger, 303 - secondary side pipeline, 304 - IT equipment, 305 - circulation pump, 306 - supply liquid pressure sensor, 307 - supply liquid temperature sensor, 308 - return liquid pressure sensor, 309 - return liquid temperature sensor, 310 - secondary side ring network, 311 - ring network supply liquid pressure sensor, 312 - ring network supply liquid temperature sensor, 313 - ring network return liquid pressure sensor, 314 - ring network return liquid temperature sensor, 320 - control unit. Among them,

[0041] 301 - primary side pipeline: It is respectively connected to the cooling equipment (such as chiller or cooling tower) and the heat exchanger in the liquid cooling system, and can be used to transport the cooled coolant to the heat exchanger, which is the primary circulation path of the coolant in the liquid cooling system.

[0042] 302 - heat exchanger: The core equipment for heat exchange, which can be used to perform heat energy conversion between the primary side pipeline and the secondary side pipeline, reducing the temperature of the liquid cooled by the primary side pipeline to effectively cool the IT equipment.

[0043] 303 - secondary side pipeline: It is respectively connected to the heat exchanger and the IT equipment, and can be used to transport the coolant that has undergone heat exchange to the IT equipment (such as each server or electronic device) for cooling, and then collect and send back the coolant with increased temperature to the heat exchanger for cooling again.

[0044] 304 - IT equipment: Servers or other electronic devices to be cooled or dissipated heat in the liquid cooling system, which generate a large amount of heat during operation and require the liquid cooling system to maintain the operating temperature.

[0045] 305 - Circulation Pump: The circulation pump can be used to drive the flow of the coolant in the entire liquid cooling system. Whether it is from the cooling equipment to the heat exchanger or from the heat exchanger to the IT equipment, a circulation pump is required to provide power.

[0046] 306 - Supply Liquid Pressure Sensor, 308 - Return Liquid Pressure Sensor: These two sensors are respectively used to detect the supply liquid pressure and return liquid pressure of the secondary side pipeline. By monitoring the supply - return liquid pressure difference (i.e., the supply - return hydraulic pressure difference), the control unit can determine the flow condition of the cooling liquid, and then can flexibly adjust the working state of the circulation pump.

[0047] 307 - Supply Liquid Temperature Sensor, 309 - Return Liquid Temperature Sensor: They are used to detect the temperature of the coolant when it enters and exits the heat exchanger in the secondary side pipeline. By monitoring the supply - return liquid temperature difference, the control unit can determine whether the cooling effect meets the cooling requirements of the IT equipment and adjust the cooling strategy accordingly.

[0048] 310 - Secondary Side Ring Network: The design of the ring network enables the coolant to circulate in a closed network, covering all or most of the IT equipment in the liquid cooling system, improving the cooling efficiency and flexibility of the system.

[0049] 311 - Ring Network Supply Liquid Pressure Sensor, 313 - Ring Network Return Liquid Pressure Sensor: They can be used to monitor the supply liquid pressure and return liquid pressure of the secondary side ring network to ensure the uniform distribution of the liquid in the ring network and an appropriate flow rate.

[0050] 312 - Ring Network Supply Liquid Temperature Sensor, 314 - Ring Network Return Liquid Temperature Sensor: They can be used to detect the supply liquid temperature and return liquid temperature of the secondary side ring network to monitor the cooling effect and the temperature condition of the IT equipment.

[0051] 320 - Control Unit: The control unit can receive information from various sensors, including pressure, temperature, etc., and adjust the opening degree of the circulation pump according to the set control mode (such as constant pressure difference control mode, constant temperature difference control mode, etc.) to ensure that the pressure difference and temperature difference in the liquid cooling system are maintained within the set range, realizing the efficient operation of the liquid cooling system and the temperature control of the IT equipment.

[0052] Figure 3 The introduction of the secondary side ring network can better balance the distribution of the coolant among various IT equipment. Even in the case of uneven loads of different IT equipment, it can ensure that all equipment is properly cooled.

[0053] Figure 3 Extra sensors (311, 312, 313, 314) are used to monitor the pressure difference and temperature difference of the secondary side ring network. These data can be used for more precise control strategies, such as adjusting the operating parameters of the circulation pump according to the temperature and pressure at different positions in the ring network.

[0054] Due to the existence of the ring network, Figure 3 the liquid cooling system in

[0055] Figure 4 can better adapt to the high density and high heat load of IT devices in the liquid cooling system, improve the cooling efficiency. At the same time, through the layout of the ring network, the resistance of the refrigerant flow can be reduced, and the energy consumption can be lowered. Figure 4 is another liquid cooling system architecture diagram according to the embodiments of the present application. The embodiments of the present application can also operate on Figure 4 the system architecture shown, as

[0056] shown, this system architecture includes: 401 - liquid supply pipeline, 402 - liquid return pipeline, 403 - liquid supply pressure sensor, 404 - liquid supply temperature sensor, 405 - liquid return pressure sensor, 406 - liquid return temperature sensor, 407 - circulation pump, 408 - bypass two - way electric valve, 420 - control unit. Among them,

[0057] 401 - liquid supply pipeline: It is the pipeline from the cold source to the Cooling Distribution Unit (CDU). The coolant can be transported from the cold source to each CDU through the liquid supply pipeline 401 to provide cooling capacity for the CDU.

[0058] 402 - liquid return pipeline: It is the pipeline from the CDU back to the cold source. The coolant can send the heat - absorbed coolant back to the cold source through the liquid return pipeline 402 for re - cooling and recycling.

[0059] 403 - liquid supply pressure sensor: It can be set on the liquid supply pipeline to measure the pressure of the coolant before entering the CDU.

[0060] 404 - liquid supply temperature sensor: It can be set on the liquid supply pipeline to measure the temperature of the coolant before entering the CDU.

[0061] 405 - liquid return pressure sensor: It can be set on the liquid return pipeline to measure the pressure of the coolant after returning from the CDU. It can be used together with the measurement data of the liquid supply pressure sensor to calculate the pressure difference inside the liquid cooling system.

[0062] 406 - liquid return temperature sensor: It can be set in the liquid return pipeline to measure the temperature of the coolant after returning from the CDU. It can be used together with the measurement data of the liquid supply temperature sensor to calculate the temperature difference inside the liquid cooling system.

[0063] 408 - By - pass two - way electric valve: In the liquid - cooling system, the by - pass valve 408 can be used to adjust the flow rate of the coolant. For example, when it is necessary to adjust the cooling effect or balance the system, the by - pass valve can bypass part of the heat exchanger and directly circulate, thereby adjusting the flow distribution within the system.

[0064] 420 - Control unit: It can be used to control the operating state of the circulation pump and the opening degree of the by - pass valve according to the data collected from the pressure sensor and the temperature sensor, combined with the change of the IT device load, so as to achieve the efficient operation of the system and the regulation of the temperature of the IT device.

[0065] Figure 4 In it, with the addition of the by - pass two - way electric valve, the flexibility of flow control is increased. In the constant - pressure - difference control mode, when the liquid - cooling system detects that the temperature difference is too low or too high, the control unit can adjust the opening degree of the circulation pump or the opening and closing state of the by - pass valve to change the flow rate and heat - exchange efficiency within the system. For example, when the IT load is low and the temperature difference is too low, the control unit 420 can adjust the opening degree of the by - pass valve to reduce the refrigerant flow rate through the CDU, thereby reducing the overall energy consumption of the system.

[0066] In this embodiment, a control method for a liquid - cooling system operating on the above - mentioned computer terminal or system architecture is provided. Figure 5 It is a flowchart of the control method for the liquid - cooling system according to the embodiment of the present application, as Figure 5 shown, and this process includes the following steps:

[0067] Step S501, determine that the current operating mode of the liquid - cooling system is the constant - pressure - difference control mode, and obtain the supply - return hydraulic pressure difference between the supply pressure and the return pressure in the constant - pressure - difference control mode.

[0068] Step S502, according to the supply - return hydraulic pressure difference and the preset first control - mode switching condition, switch the constant - pressure - difference control mode to the constant - temperature - difference control mode.

[0069] Step S503, in the constant - temperature - difference control mode, adjust the supply - return liquid flow rate to adjust the supply - return liquid temperature difference between the supply liquid temperature and the return liquid temperature, and according to the adjusted supply - return liquid temperature difference and the preset second control - mode switching condition, switch the constant - temperature - difference control mode to the constant - pressure - difference control mode.

[0070] In an exemplary embodiment, the first control - mode switching condition is that the supply - return hydraulic pressure difference is less than the sum of the preset pressure difference and the preset allowable deviation of the pressure - difference change, and greater than the difference between the preset pressure difference and the preset allowable deviation of the pressure - difference change, and continuously satisfies the preset first duration.

[0071] Exemplarily, in the constant pressure difference control mode, the liquid cooling system can control the switching of the constant pressure difference control mode to the constant temperature difference control mode when the difference between the supply and return hydraulic pressures satisfies being less than the sum of the preset pressure difference value and the allowable deviation value of the preset pressure difference change, and being greater than the difference between the preset pressure difference value and the allowable deviation value of the preset pressure difference change, and continuously satisfying the preset first duration.

[0072] In an exemplary embodiment, the second control mode switching condition includes at least one of the following:

[0073] The difference between the supply and return liquid temperature values is greater than the difference between the preset temperature difference value and the allowable deviation value of the preset third temperature difference change, and continuously satisfies the preset fourth duration;

[0074] The difference between the supply and return liquid temperature values is less than or equal to the sum of the preset temperature difference value and the allowable deviation value of the preset fourth temperature difference change, and continuously satisfies the preset fifth duration.

[0075] Exemplarily, in the constant temperature difference control mode, the liquid cooling system can control the switching of the constant temperature difference control mode back to the constant pressure difference control mode when the difference between the supply and return liquid temperature values satisfies being greater than or equal to the difference between the preset temperature difference value and the allowable deviation value of the preset first temperature difference change, and continuously satisfies the preset fourth duration; or, it can control the switching of the constant temperature difference control mode back to the constant pressure difference control mode when the difference between the supply and return liquid temperature values satisfies being less than or equal to the sum of the preset temperature difference value and the allowable deviation value of the preset second temperature difference change, and continuously satisfies the preset fifth duration.

[0076] Among them, the above first duration, fourth duration, and fifth duration can be the same or different, and those skilled in the art can set them according to the actual situation, and the embodiments of the present application do not limit this here.

[0077] Through the above steps, the embodiments of the present application can achieve the linkage control of the pressure difference and the temperature difference on the basis of the constant pressure difference control mode, in combination with the change of the difference between the supply and return liquid temperatures of the device to be cooled (such as IT equipment). When the difference between the supply and return liquid temperatures of the device to be cooled is relatively low, the constant pressure difference control can be switched to the constant temperature difference control to improve the overall energy efficiency of the system (for example, in the constant temperature difference control mode, when the temperature difference is relatively low, the rotational speed of the circulation pump can be reduced, thereby improving the overall energy efficiency of the system); when the difference between the supply and return liquid temperatures of the device to be cooled is relatively high, to avoid the high temperature situation of the device to be cooled, the constant pressure difference control can be switched to the constant temperature difference control to increase the overall heat exchange of the system (for example, in the constant temperature difference control mode, when the temperature difference is relatively high, the rotational speed of the circulation pump can be increased to increase the overall heat exchange of the system), and eliminate the high temperature situation of the device to be cooled. After the liquid cooling system is switched from the constant pressure difference control to the constant temperature difference control and the temperature difference control is stable, after meeting the temperature difference condition of the device to be cooled (that is, the temperature difference satisfies the second control mode switching condition), it can be switched back to the constant pressure difference control.

[0078] Through the above steps, the liquid cooling system can perform the linkage control of constant pressure difference and constant temperature difference according to the heat dissipation requirements of the actual equipment to be cooled in the constant pressure difference control mode, making the liquid cooling system more energy-efficient on the premise of meeting the refrigeration requirements, without manual intervention, and improving the overall reliability of the system. It solves the problems in the related technology that the liquid cooling system cannot intelligently adapt to the load changes of the equipment to be cooled in the constant pressure difference control mode, resulting in energy waste at low loads and insufficient heat dissipation at high loads.

[0079] Among them, the execution subject of the above steps can be a liquid cooling CDU, a liquid cooling EDU, a liquid cooling group control system, an air-cooled air conditioner system, etc., but not limited thereto.

[0080] In an exemplary embodiment, the above step S502 may include:

[0081] When the difference value between the supply and return liquid pressures meets the first control mode switching condition, keep the current opening degree of the circulation pump in the liquid cooling system, and obtain the current difference value between the supply and return liquid temperatures; determine that the difference value between the supply and return liquid temperatures meets the preset third control mode switching condition; the third control mode switching condition is that the difference value between the supply and return liquid temperatures is less than the difference between the preset temperature difference value and the preset first temperature difference change allowable deviation value, and continuously meets the preset second duration; switch the constant pressure difference control mode to the constant temperature difference control mode.

[0082] In an exemplary embodiment, the above step S503, when adjusting the supply and return liquid flow rate in the constant temperature difference control mode, may include:

[0083] When the difference value between the supply and return liquid temperatures meets the third control mode switching condition, reduce the supply and return liquid flow rate by controlling the opening degree of the circulation pump to be smaller.

[0084] In an exemplary embodiment, it further includes: after the difference value between the supply and return liquid temperatures is less than the difference between the preset temperature difference value and the preset first temperature difference change allowable deviation value, and continuously meets the preset second duration, output the first status bit and the first value of the first status bit; wherein, the first value of the first status bit is used to indicate that the constant pressure difference control mode has been switched to the constant temperature difference control mode.

[0085] As an example, the first value of the first status bit can be used to indicate the state that the constant pressure difference control mode is switched to the constant temperature difference control mode when the difference value between the supply and return liquid temperatures is relatively low.

[0086] As an example, the switching between the constant pressure difference control mode and the constant temperature difference control mode in the embodiments of the present application can be controlled by a control unit in the liquid cooling system or manually switched by the user on the system. The setting of the first status bit can be used to distinguish whether the constant pressure difference control mode is switched to the constant temperature difference control mode by the control unit or the mode is manually switched by the user on the system.

[0087] For example, the first status bit can be "Differential Pressure Automatic Conversion to Temperature Difference Flag Memory 1", and the first value of the first status bit can be "1".

[0088] It should be noted that the above first status bit and the first value of the first status bit are only examples, and those skilled in the art can set other forms or other values according to the actual situation, and the embodiments of the present application do not limit this here.

[0089] Among them, the above second duration can be the same as or different from the first duration, the third duration, and the fourth duration. Those skilled in the art can set it according to the actual situation, and the embodiments of the present application do not limit this here.

[0090] In an exemplary embodiment, the switching of the constant pressure difference control mode to the constant temperature difference control mode includes:

[0091] When the supply-return liquid pressure difference meets the first control mode switching condition, obtain the current supply-return liquid temperature difference value; determine that the supply-return liquid temperature difference value meets the preset fourth control mode switching condition; the fourth control mode switching condition is that the supply-return liquid temperature difference value is greater than the sum of the preset temperature difference value and the preset second temperature difference change allowable deviation value and continuously meets the preset third duration; switch the constant pressure difference control mode to the constant temperature difference control mode.

[0092] In an exemplary embodiment, the adjusting of the supply-return liquid flow rate in the constant temperature difference control mode includes:

[0093] When the supply-return liquid temperature difference value meets the fourth control mode switching condition, increase the supply-return liquid flow rate by controlling the opening of the circulation pump to be larger.

[0094] In an exemplary embodiment, after the supply-return liquid pressure difference is greater than the sum of the preset temperature difference value and the preset second temperature difference change allowable deviation value and continuously meets the preset third duration, output the second status bit and the first value of the second status bit; wherein, the first value of the second status bit is used to indicate that the constant pressure difference control mode has been switched to the constant temperature difference control mode.

[0095] As an example, the setting of the second status bit can also be used to distinguish whether the constant differential pressure control mode is switched to the constant temperature difference control mode by the control unit or the mode is switched manually by the user on the system.

[0096] As an example, the first value of the second status bit can be used to indicate the state where the constant differential pressure control mode is switched to the constant temperature difference control mode when the supply-return liquid temperature difference value is relatively high.

[0097] For example, the second status bit can be "temperature difference automatically switched to differential pressure flag memory 2", and the first value of the second status bit can be "1".

[0098] It should be noted that the above-mentioned second status bit and the first value of the second status bit are only examples, and those skilled in the art can make other forms or other numerical settings according to the actual situation, and the embodiments of the present application do not limit this here.

[0099] In an exemplary embodiment, when the supply-return liquid temperature difference value is less than or equal to the sum of the preset temperature difference value and the preset second temperature difference change allowable deviation value, and greater than or equal to the difference between the preset temperature difference value and the preset first temperature difference change allowable deviation value, control the circulation pump to maintain the current opening degree.

[0100] In an exemplary embodiment, it is determined that the supply-return liquid pressure difference value does not meet the first control mode switching condition, and in the constant differential pressure control mode, adjust the supply-return liquid flow rate to adjust the supply-return liquid pressure difference value.

[0101] In an exemplary embodiment, the adjusting the supply-return liquid flow rate in the constant differential pressure control mode includes:

[0102] When the supply-return liquid pressure difference value is greater than or equal to the sum of the preset pressure difference value and the preset pressure difference change allowable deviation value, control the opening degree of the circulation pump in the liquid cooling system to be reduced to reduce the supply-return liquid flow rate; or

[0103] When the supply-return liquid pressure difference value is less than or equal to the difference between the preset pressure difference value and the preset pressure difference change allowable deviation value, control the opening degree of the circulation pump in the liquid cooling system to be increased to increase the supply-return liquid flow rate.

[0104] In an exemplary embodiment, the switching the constant temperature difference control mode to the constant differential pressure control mode according to the adjusted supply-return liquid temperature difference value and the preset second control mode switching condition includes:

[0105] Determine that the value of the current first status bit in the constant temperature difference control mode is the first value; determine that the current supply-return liquid temperature difference value is greater than the difference between the preset temperature difference value and the preset third allowable temperature difference change deviation value, and continuously meets the preset fourth duration, and switch the constant temperature difference control mode to the constant pressure difference control mode.

[0106] In an exemplary embodiment, after the supply-return liquid temperature difference value is greater than the difference between the preset temperature difference value and the preset third allowable temperature difference change deviation value, and continuously meets the preset fourth duration, switch the first value of the first status bit to the second value.

[0107] As an example, the second value of the first status bit can be used to indicate that the low temperature difference situation has been stably controlled in the constant temperature difference control mode, and the control mode can be switched back from the constant temperature difference control to the constant pressure difference control. Among them, the set second value is different from the first value to distinguish the current control mode state of the liquid cooling system.

[0108] In an exemplary embodiment, the switching of the constant temperature difference control mode to the constant pressure difference control mode according to the adjusted supply-return liquid temperature difference value and the preset second control mode switching condition includes:

[0109] Determine that the value of the current second status bit in the constant temperature difference control mode is the first value; determine that the current supply-return liquid temperature difference value is less than the sum of the preset temperature difference value and the preset fourth allowable temperature difference change deviation value, and continuously meets the preset fifth duration, and switch the constant temperature difference control mode to the constant pressure difference control mode.

[0110] In an exemplary embodiment, after the supply-return liquid temperature difference value is less than the sum of the preset temperature difference value and the preset fourth allowable temperature difference change deviation value, and continuously meets the preset fifth duration, switch the first value of the second status bit to the second value.

[0111] As an example, the second value of the second status bit can be used to indicate that the high temperature difference situation has been stably controlled in the constant temperature difference control mode of the liquid cooling system, and the control mode can be switched back from the constant temperature difference control to the constant pressure difference control. Among them, the set second value is different from the first value to distinguish the current control mode state of the liquid cooling system.

[0112] It should be noted that the allowable deviation values of the first temperature difference change, the second temperature difference change, the third temperature difference change, and the fourth temperature difference change in the embodiments of the present application may be the same or different. Those skilled in the art can set them according to the actual situation, and the embodiments of the present application do not limit this here. Similarly, the preset first duration, the preset second duration, the preset third duration, the preset fourth duration, and the preset fifth duration may be the same or different. Those skilled in the art can set them according to the actual situation, and the embodiments of the present application do not limit this here.

[0113] In an exemplary embodiment, it is determined that the value of the current first status bit in the constant temperature difference control mode is not the first value, and the value of the current second status bit is not the first value, and the constant temperature difference control mode is maintained.

[0114] As an example, when the values of the first status bit and the second status bit in the constant temperature difference control mode are both not the first value, it indicates that the current constant temperature difference control mode is a selection and setting manually made by the user on the system, rather than the control unit of the liquid cooling system controlling the switching from the constant pressure difference control mode to the constant temperature difference control mode. In this state, the operating mode of the constant temperature difference control mode can continue to be maintained.

[0115] The following further illustrates the linkage control process of the pressure difference and the temperature difference in the embodiments of the present application through a specific example:

[0116] Example 1

[0117] For example, Figure 6 is the flow chart of the linkage control operation of the pressure difference and the temperature difference according to the embodiments of the present application. As shown in Figure 6 shown, it may specifically include the following steps:

[0118] S601: The unit starts running.

[0119] This Example 1 can run on the Figure 2 / Figure 3 / Figure 4 shown liquid cooling system architecture. Taking the liquid cooling system architecture of Figure 2 as an example, for example, referring to Figure 2 , the circulation pump 205 can be started at its default opening. The unit control mode may include but is not limited to the constant pressure difference control mode, the constant temperature difference control mode, and the constant flow control mode. When the unit starts, the liquid cooling system can default to run in the constant pressure difference control mode. The control mode switching can be a selection and setting manually made by the user on the system. For example, it can be selected by the user as the constant temperature difference control mode, or it can be controlled and switched between the constant pressure difference and the constant temperature difference modes by the control unit 220 according to the state of the liquid cooling system.

[0120] S602: Determine whether the current operating mode is the constant differential pressure control mode.

[0121] That is, it is possible to judge the current "control mode" to determine whether it is the constant differential pressure control mode. As an example, the control unit 220 can determine whether the current operating mode is the constant differential pressure control mode.

[0122] S603: If so, it is possible to further determine whether the current supply-return hydraulic pressure difference P12 satisfies that P12 is less than the sum of the preset differential pressure value P12set and the preset allowable deviation value ΔP of the differential pressure change, and greater than the difference between the preset differential pressure value P12set and the preset allowable deviation value ΔP of the differential pressure change, and the continuous duration satisfies the preset first duration t0.

[0123] As an example, taking Figure 2 the liquid cooling system architecture as an example, Figure 2 the control unit 220 of

[0124] can collect the pressure values of the system supply pressure sensor 206 and the return pressure sensor 208, and the control unit 220 calculates the current supply-return hydraulic pressure difference P12 of the liquid cooling system according to the difference between the supply pressure value and the return pressure value. Figure 3 Similarly, this Example 1 can also operate on Figure 3 the liquid cooling system architecture shown. For example, referring to

[0125]

[0126]

[0127]

[0128] As an example, when the condition determination in S602 is yes, that is, when the current operating mode of the unit is the constant differential pressure control mode, the control unit 220 can determine whether the current supply-return hydraulic pressure difference P12 of the liquid cooling system satisfies being less than the sum of P12set and ΔP, and greater than the difference between P12set and ΔP, and needs to continuously satisfy the preset first duration t0, where t0 can be set differently according to different systems.

[0128]

[0128] S604: If P12 does not satisfy the condition of being less than the sum of P12set and ΔP, and greater than the difference between P12set and ΔP, and needs to continuously satisfy the preset first duration t0, the operating mode of the unit can be controlled to remain in the current control mode, that is, still the constant differential pressure control mode.

[0127] As an example, P12 not satisfying being less than the sum of P12set and ΔP, and greater than the difference between P12set and ΔP can include two cases: P12 ≥ P12set + ΔP, P12 ≤ P12set - ΔP.

[0128] As an example, in the constant pressure difference control mode, the circulation pump 205 can be controlled to adjust according to P12. When P12 ≥ P12set + ΔP, the opening of the circulation pump can be controlled to be reduced; when P12 ≤ P12set - ΔP, the opening of the circulation pump can be controlled to be increased; when P12set - ΔP < P12 < P12set + ΔP, the circulation pump can be controlled to maintain the current opening.

[0129] S605: If P12 meets the condition of step S603, it can be further determined whether the current supply and return liquid temperature difference value T12 of the liquid cooling system is less than the difference between the preset temperature difference value T12set and the preset first temperature difference change allowable deviation value T1, and continuously meets the preset second duration t1.

[0130] As an example, referring to Figure 2 , the control unit 220 can collect the return liquid temperature value through the return liquid temperature sensor 209 respectively, collect the supply liquid temperature value through the supply liquid temperature sensor 207, and the control unit 220 calculates the return liquid temperature difference value T12 according to the difference between the return liquid temperature value and the supply liquid temperature value. Among them, the first temperature difference change allowable deviation value T1 can refer to the low temperature control deviation.

[0131] Similarly, if it runs on the liquid cooling system architecture shown in Figure 3 , for example, referring to Figure 3 , the system can collect the supply liquid temperature value of the ring network supply liquid temperature sensor 312 and the return liquid temperature value of the ring network return liquid temperature sensor 314, and the control unit 20 calculates the actual temperature difference value T12 of the system according to the difference between the return liquid temperature value and the supply liquid temperature value.

[0132] As an example, when P12set - ΔP < P12 < P12set + ΔP, the control unit 220 can further determine whether T12 satisfies T12 < T12set - T1, and the continuous duration meets the preset second duration t1, and t1 can be set differently according to different systems.

[0133] S606: If the condition of S605 is met, switch the constant pressure difference control to the constant temperature difference control, and control the circulation pump to be reduced, and the water pump output is the same instantaneously before and after the control mode is switched.

[0134] As an example, if the condition of S605 is met, that is, T12 < T12set - T1, and the continuous duration meets the preset second duration t1, the unit operation mode can be switched from the constant pressure difference control to the constant temperature difference control. In addition, the water pump output can be made the same instantaneously before and after the control mode is switched, that is, PID_out after = PID_out before, to ensure that the water pump opening does not change suddenly before and after the control source mode is switched.

[0135] As an example, when T12 < T12set - T1, it indicates that the load of the device to be cooled is low. When switching from the constant pressure difference control mode to the constant temperature difference control mode, the opening of the circulation pump can be controlled to be reduced, thereby improving the overall energy efficiency of the system.

[0136] S607: When T12 satisfies T12 < T12set - T1 and the duration satisfies t1, the control unit 220 can output "Differential Pressure Auto-Switch to Temperature Difference Flag Memory 1" (i.e., the first status bit), and the value of this status bit can be set to "1".

[0137] As an example, the setting of the first status bit can be used to distinguish whether the control unit 220 automatically switches from the constant pressure difference control mode to the constant temperature difference control mode or the user manually switches the mode on the system.

[0138] S608: When the determination condition of step S605 is not satisfied, it can be further determined whether T12 is greater than the sum of the preset temperature difference value T12set and the preset second temperature difference change allowable deviation value T2 and continuously satisfies the preset third duration t2.

[0139] As an example, when the determination condition of step S605 is not satisfied, that is, the control unit 220 determines that T12 does not satisfy being less than the difference between T12set and T1, it is necessary to further determine by the control unit 220 whether T12 is greater than the sum of T12set and T2, and the duration satisfies t2. t2 can be set differently according to different systems. Among them, the second temperature difference change allowable deviation value T2 can refer to the high-temperature control deviation.

[0140] Meanwhile, if the actual temperature difference value of the system, i.e., T12, does not satisfy being less than the difference between T12set and T1 and does not satisfy being greater than the sum of T12set and T2, step S604 is executed, that is, the unit operation mode remains the current control mode, i.e., still the constant pressure difference control mode.

[0141] S609: Under the condition of satisfying the S608 determination condition, switch the constant pressure difference control mode to the constant temperature difference control mode, control the circulation pump to open wider, and control PID_out after = PID_out before.

[0142] As an example, under the condition of satisfying the S608 determination condition, that is, the control unit 220 determines that T12 satisfies being greater than the sum of T12set and T2 and continuously satisfies the duration t2, the unit operation mode is automatically switched from the constant pressure difference control to the constant temperature difference control. In addition, it is necessary to keep the instantaneous water pump control output the same before and after the mode switch to ensure that the opening of the water pump does not change suddenly before and after the control source mode switch.

[0143] As an example, when T12 is greater than the sum of T12set and T2, it indicates that the load of the device to be cooled is relatively high. When switching the constant pressure difference control mode to the constant temperature difference control mode, the opening of the circulation pump can be gradually increased, thereby increasing the overall heat exchange of the system.

[0144] As an example, in the constant temperature difference control mode, when T12 is less than or equal to the sum of the value T12set and T2, and T12 is greater than or equal to the difference between T12set and T1, the circulation pump can be controlled to maintain the current opening.

[0145] S610: Under the condition that the determination condition of S608 is satisfied, the control unit 220 can output the "differential pressure automatic conversion to temperature difference flag memory 2" status bit and set this status bit to "1".

[0146] As an example, under the condition that the determination condition of S608 is satisfied, that is, when the control unit 220 determines that T12 satisfies being greater than the sum of T12set and T2 and lasts for a duration t2, an "differential pressure automatic conversion to temperature difference flag memory 2" status bit (i.e., the second status bit) is output and this status bit is set to "1". This status bit can be used to distinguish whether it is the control unit 220 that automatically switches from the constant pressure difference control mode to the constant temperature difference control mode or whether the mode is switched manually by the user on the system.

[0147] S611: When the condition determination of S602 is negative, it can be determined whether the current operating mode is the constant temperature difference control mode.

[0148] S612: When the condition determination of S611 is negative, the current control mode can be maintained.

[0149] S613: When the condition determination of S611 is positive, it can be further determined whether the "differential pressure automatic conversion to temperature difference flag memory 1" status bit is "1".

[0150] S614: When the condition determination of S613 is negative, it can be further determined whether the "differential pressure automatic conversion to temperature difference flag memory 2" status bit is "1".

[0151] S615: If neither the "differential pressure automatic conversion to temperature difference flag memory 1" nor the "differential pressure automatic conversion to temperature difference flag memory 2" status bit is "1", the current control mode is maintained.

[0152] As an example, when the control unit 220 determines that neither the "differential pressure automatic conversion to temperature difference flag memory 1" nor the "differential pressure automatic conversion to temperature difference flag memory 2" status bit is 1 for the system, the unit operating mode can be maintained in the current control mode, that is, it is still the constant temperature difference control mode.

[0153] As an example, when the status bits of "Differential pressure automatic conversion to temperature difference flag memory 1" and "Differential pressure automatic conversion to temperature difference flag memory 2" are not both "1", it indicates that the current constant temperature difference control mode is a selection and setting manually made by the user on the system, rather than the control unit 220 automatically switching from the constant differential pressure control mode to the constant temperature difference control mode.

[0154] S616: When the condition determination in S613 is yes, it can be further determined whether T12 is greater than the difference between T12set and the preset third temperature difference change allowable deviation value T3, and continuously satisfies the preset fourth duration t3.

[0155] That is, when the control unit 220 determines that the status bit of the system "Differential pressure automatic conversion to temperature difference flag memory 1" is 1, further, the control unit 220 can determine whether T12 is greater than the difference between T12set and T3, and continuously satisfies the duration t3. Among them, the preset third temperature difference change allowable deviation value T3 can refer to the low temperature deviation, and t3 can be set differently according to different systems.

[0156] S617: If T12 > T12set - T3 and continuously satisfies the duration t3, then the constant temperature difference control mode can be switched to the constant differential pressure control mode, and control PID_out after = PID_out before.

[0157] As an example, if T12 > T12set - T3 and continuously satisfies the duration t3, the unit operation mode can be automatically converted from the constant temperature difference control to the constant differential pressure control. In addition, the instantaneous pump control output before and after the mode switch can be kept the same to ensure that the pump opening does not change suddenly before and after the control source mode switch.

[0158] As an example, in the temperature difference control mode, when T12 > T12set - T3, it indicates that the low temperature situation in the temperature difference control mode has been controlled stably, and then the control mode can be switched back to the constant differential pressure control, so that the system can use the constant differential pressure control as the main control mode.

[0159] S618: After T12 > T12set - T3 and continuously satisfies the duration t3, the status bit of "Differential pressure automatic conversion to temperature difference flag memory 1" can be set to 0.

[0160] S619: When the condition determination in S614 is yes, it can be further determined that T12 is less than the sum of the preset temperature difference value and the preset fourth temperature difference change allowable deviation value T4, and continuously satisfies the preset fifth duration t4.

[0161] That is, when the control unit 20 determines that the status bit of the system "Differential pressure automatic conversion to temperature difference flag memory 2" is 1, further, the control unit 20 can determine whether T12 is less than the sum of T12set and T4, and continuously satisfies the duration t4. t4 can be set differently according to different systems.

[0162] S620: When T12 < T12set + T4 and the duration t4 is continuously satisfied, the constant temperature difference control mode can be switched to the constant pressure difference control mode, and PID_out after control = PID_out before.

[0163] As an example, when T12 satisfies T12 < T12set + T4 and the duration t4 is continuously satisfied, the unit operation mode can be automatically switched from the constant temperature difference control to the constant pressure difference control. In addition, the instantaneous water pump control output before and after the mode switch can be kept the same to ensure that the opening of the water pump does not change suddenly before and after the control source mode switch.

[0164] As an example, in the temperature difference control mode, when T12 is less than the sum of T12set and T4, it indicates that the high temperature difference situation has been stably controlled in the temperature difference control mode. Then the control mode can be switched back to the constant pressure difference control, which can ensure that the system mainly uses the constant pressure difference control as the control mode.

[0165] S621: When T12 satisfies T12 < T12set + T4 and the duration t4 is continuously satisfied, the status bit of "pressure difference auto-switch to temperature difference flag memory 2" can be set to "0".

[0166] S622: When the condition determination of S616 is NO and / or the condition determination of S619 is NO, the current control mode can be maintained.

[0167] As an example, when the control unit 220 determines that T12 does not satisfy the condition of T12 > T12set - T3 and the duration t3 is continuously satisfied, the unit operation mode can be maintained in the current control mode, that is, still the constant temperature difference control mode.

[0168] As an example, when the condition determination of S619 is NO, that is, when the control unit 220 determines that T12 does not satisfy the condition of T12 < T12set + T4 and the duration t4 is continuously satisfied, the unit operation mode can be maintained in the current control mode, that is, still the constant temperature difference control mode.

[0169] In addition, in an embodiment, the liquid cooling system of the present application embodiment can also be set with a mode locking function. The control unit calculates the number of times of continuously switching from the pressure difference mode to the temperature difference mode within a fixed time (such as 2 hours, the time can be adjusted). When the number of switches reaches the preset switch number threshold (such as when continuously switching to the temperature difference mode 3 times within the fixed time), it indicates that the set relevant parameters in the current system pressure difference mode can no longer meet the stable and reliable operation of the load of the device to be cooled. At this time, it can be locked to the temperature difference control mode. Even after the temperature difference is stably controlled, it will not be automatically switched back to the pressure difference control mode. If it is necessary to switch the control mode, it can be switched manually.

[0170] Through the steps in the above-mentioned Example 1, when the load of the device to be cooled is low, the system can adaptively switch from the constant pressure difference control mode to the constant temperature difference mode, and reduce the rotational speed or opening degree of the circulation pump to improve the overall energy efficiency of the system; when the load of the device to be cooled is high, it can adaptively switch from the constant pressure difference control mode to the constant temperature difference mode, and increase the rotational speed or opening degree of the low circulation pump to increase the overall heat exchange of the system; making the system more energy-efficient on the premise of meeting the refrigeration demand, without manual intervention, and improving the overall reliability of the system.

[0171] In an exemplary embodiment, it is determined that the current operating mode of the liquid cooling system is not the constant pressure difference control mode and not the constant temperature difference control mode, and the constant flow control mode is determined as the current operating mode of the liquid cooling system.

[0172] In an exemplary embodiment, it further includes:

[0173] Obtain the current flow value in the constant flow control mode; according to the current flow value and a preset fifth control mode switching condition, switch the constant flow control mode to the constant temperature difference control mode, and output a third status bit and a first value of the third status bit; wherein, the first value of the third status bit is used to indicate that the constant flow control mode has been switched to the constant temperature difference control mode.

[0174] As an example, the switching between the constant flow control mode and the constant temperature difference control mode in the embodiments of the present application can be controlled by a control unit in the liquid cooling system or manually switched by a user on the system. The setting of the third status bit can be used to distinguish whether the constant flow control mode is switched to the constant temperature difference control mode by the control unit or the mode is manually switched by the user on the system.

[0175] In an exemplary embodiment, it further includes:

[0176] In the constant temperature difference control mode, adjust the supply liquid flow or the return liquid flow to adjust the supply-return liquid temperature difference value between the supply liquid temperature and the return liquid temperature, and according to the adjusted supply-return liquid temperature difference value and a preset sixth control mode switching condition, switch the constant temperature difference control mode to the constant flow control mode.

[0177] In an exemplary embodiment, wherein the fifth control mode switching condition is that the current flow value is less than the sum of a preset flow value and a preset flow change allowable deviation value, and greater than the difference between the preset flow value and the preset flow change allowable deviation value, and continuously satisfies a preset sixth duration.

[0178] In an exemplary embodiment, wherein the sixth control mode switching condition includes at least one of the following:

[0179] The supply-return liquid temperature difference value is greater than or equal to the difference between the preset temperature difference value and the preset third allowable temperature difference change deviation value, and continuously satisfies the preset fourth duration, and the first value of the third status bit is switched to the second value; the second value of the third status bit is used to indicate that the constant temperature difference control mode is switched to the constant flow control mode;

[0180] The supply-return liquid temperature difference value is less than or equal to the sum of the preset temperature difference value and the preset fourth allowable temperature difference change deviation value, and continuously satisfies the preset fifth duration, and the first value of the third status bit is switched to the second value.

[0181] The following further illustrates the linkage control process of flow rate and temperature difference in the embodiments of the present application through a specific example:

[0182] Example 2

[0183] For example, Figure 7 is the flow rate and temperature difference linkage control operation flow chart according to the embodiments of the present application. As shown in Figure 7 shown, it may specifically include the following steps:

[0184] S701: The unit starts running.

[0185] This Example 2 can run on the Figure 2 / Figure 3 / Figure 4 shown liquid cooling system architecture. Taking the Figure 2 liquid cooling system architecture as an example, for example, referring to Figure 2 , the circulation pump 205 can be started at its default opening. The unit control mode can include but is not limited to the constant pressure difference control mode, the constant temperature difference control mode, and the constant flow control mode. When the unit starts, the liquid cooling system can default to run in the constant pressure difference control mode. The control mode switch can be a selection setting manually made by the user on the system. For example, it can be selected by the user as the constant temperature difference control mode, or it can be controlled and switched between the constant pressure difference and constant temperature difference modes by the control unit 220 according to the state of the liquid cooling system.

[0186] S702: Determine whether the current operating mode is the constant flow control mode.

[0187] That is, it can judge the current "control mode" to determine whether it is the constant flow control mode. As an example, the control unit 220 can determine whether the current operating mode is the constant flow control mode.

[0188] S703: If so, it can further judge whether the current pipeline flow rate F satisfies that F is less than the sum of the preset pressure difference value Fset and the preset flow rate change allowable deviation value ΔF, and greater than the difference between the preset flow rate value Fset and the preset flow rate change allowable deviation value ΔF, and the continuous duration satisfies the preset sixth duration t5.

[0189] As an example, when the condition determination of S702 is yes, that is, when the current operation mode of the unit is the constant flow control mode, the control unit 220 can determine whether the current flow rate F of the liquid cooling system satisfies being less than the sum of Fset and ΔF, and greater than the difference between Fset and ΔF, and needs to continuously satisfy the preset sixth duration t5, where t5 can be set differently according to different systems.

[0190] S704: If F does not meet the condition of 703, the operation mode of the unit can be controlled to remain in the current control mode, that is, still the constant flow control mode.

[0191] As an example, if F does not meet the condition of 703, that is, F does not satisfy being less than the sum of Fset and ΔF, and greater than the difference between Fset and ΔF, it can include two cases: F≥Fset + ΔF, F≤Fset - ΔF.

[0192] As an example, in the constant flow control mode, the circulation pump 205 can be controlled to adjust according to F. When F≥Fset + ΔF, the opening of the circulation pump can be controlled to be reduced; when F≤Fset - ΔF, the opening of the circulation pump can be controlled to be increased; when Fset - ΔF<F<F + ΔF, the circulation pump can be controlled to maintain the current opening.

[0193] S705: If F meets the condition of step S703, it can be further determined whether the current supply - return liquid temperature difference value T12 of the liquid cooling system satisfies being less than the difference between the preset temperature difference value T12set and the preset first temperature difference change allowable deviation value T1, and continuously satisfies the preset second duration t1.

[0194] As an example, when Fset - ΔF<F<Fset + ΔF, the control unit 220 can further determine whether T12 satisfies T12<T12set - T1, and the continuous duration satisfies the preset second duration t1, and t1 can be set differently according to different systems.

[0195] S706: If the condition of S705 is met, the constant flow control is switched to the constant temperature difference control, and the circulation pump is controlled to be reduced, and the water pump output is the same immediately before and after the control mode switch.

[0196] As an example, if the condition of S705 is met, that is, T12<T12set - T1, and the continuous duration satisfies the preset second duration t1, the operation mode of the unit can be switched from the constant flow control to the constant temperature difference control. In addition, the water pump output can be made the same immediately before and after the control mode switch, that is, PID_out after = PID_out before, to ensure that the opening of the water pump does not change suddenly before and after the control source mode switch.

[0197] As an example, when T12 < T12set - T1, it indicates that the load of the device to be cooled is low. When switching from the constant flow control mode to the constant temperature difference control mode, the opening of the circulation pump can be reduced, thereby improving the overall energy efficiency of the system.

[0198] S707: When T12 satisfies T12 < T12set - T1 and the duration satisfies t1, the control unit 220 can output "flow automatically switched to temperature difference flag memory 1" (i.e., the third status bit), and the value of this status bit can be set to "1".

[0199] As an example, the setting of the third status bit can be used to distinguish whether the control unit 220 automatically switches from the constant flow control mode to the constant temperature difference control mode or the user manually switches the mode on the system.

[0200] S708: When the determination condition of step S705 is not satisfied, it can be further determined whether T12 is greater than the sum of the preset temperature difference value T12set and the preset second temperature difference change allowable deviation value T2, and continuously satisfies the preset third duration t2.

[0201] As an example, when the determination condition of step S705 is not satisfied, that is, the control unit 220 determines that T12 does not satisfy being less than the difference between T12set and T1, it is necessary to further determine by the control unit 220 whether T12 is greater than the sum of T12set and T2, and the duration satisfies t2. T2 can be set differently according to different systems. Among them, the second temperature difference change allowable deviation value T2 can refer to the high-temperature control deviation.

[0202] At the same time, if the actual temperature difference value of the system, i.e., T12, does not satisfy being less than the difference between T12set and T1 and does not satisfy being greater than the sum of T12set and T2, then step S704 is executed, that is, the unit operation mode remains the current control mode, that is, still the constant pressure difference control mode.

[0203] S709: Under the condition of satisfying the S708 determination condition, switch the constant flow control mode to the constant temperature difference control mode, increase the opening of the circulation pump, and control PID_out after = PID_out before.

[0204] As an example, under the condition of satisfying the S708 determination condition, that is, the control unit 220 determines that T12 satisfies being greater than the sum of T12set and T2 and continuously satisfies the duration t2, the unit operation mode is automatically switched from the constant pressure difference control to the constant temperature difference control. In addition, it is necessary to keep the water pump control output the same before and after the mode switch to ensure that the opening of the water pump does not change suddenly before and after the control source mode switch.

[0205] As an example, when T12 is greater than the sum of T12set and T2, it indicates that the load of the device to be cooled is relatively high. When switching the constant flow control mode to the constant temperature difference control mode, the opening of the circulation pump can be gradually increased, thereby increasing the overall heat exchange of the system.

[0206] As an example, in the constant temperature difference control mode, when T12 is less than or equal to the sum of the value T12set and T2, and T12 is greater than or equal to the difference between T12set and T1, the circulation pump can be controlled to maintain the current opening.

[0207] S710: Under the condition that the determination condition of S708 is satisfied, the control unit 220 can output the status bit of "flow automatically switches to temperature difference flag memory 2" and set this status bit to "1".

[0208] As an example, under the condition that the determination condition of S708 is satisfied, that is, when the control unit 220 determines that T12 satisfies being greater than the sum of T12set and T2 and continues to satisfy for a duration of t2, it outputs a status bit of "flow automatically switches to temperature difference flag memory 2" (the fourth status bit) and sets this status bit to "1". This status bit can be used to distinguish whether it is automatically switched from the flow difference control mode to the constant temperature difference control mode by the control unit 220 or the mode is switched manually by the user on the system.

[0209] S711: When the condition determination of S702 is negative, it can be determined whether the current operation mode is the constant temperature difference control mode.

[0210] S712: When the condition determination of S711 is negative, the current control mode can be maintained.

[0211] S713: When the condition determination of S711 is positive, it can be further determined whether the status bit of "flow automatically switches to temperature difference flag memory 1" is "1".

[0212] S714: When the condition determination of S713 is negative, it can be further determined whether the status bit of "flow automatically switches to temperature difference flag memory 2" is "1".

[0213] S715: If the status bits of "flow automatically switches to temperature difference flag memory 1" and "flow automatically switches to temperature difference flag memory 2" are both not "1", the current control mode is maintained.

[0214] As an example, when the control unit 220 determines that the status bits of both "flow automatically switches to temperature difference flag memory 1" and "flow automatically switches to temperature difference flag memory 2" of the system are not 1, the operation mode of the unit can be maintained in the current control mode, that is, it is still the constant temperature difference control mode.

[0215] As an example, when the status bits of "Flow Automatic Conversion to Temperature Difference Flag Memory 1" and "Flow Automatic Conversion to Temperature Difference Flag Memory 2" are not "1", it indicates that the current constant temperature difference control mode is a selection and setting manually made by the user on the system, rather than automatically switched from the constant flow control mode to the constant temperature difference control mode by the control unit 220.

[0216] S716: When the condition determination in S713 is yes, it can be further determined whether T12 is greater than the difference between T12set and the preset third temperature difference change allowable deviation value T3, and continuously satisfies the preset fourth duration t3.

[0217] That is, when the control unit 220 determines that the status bit of the system "Flow Automatic Conversion to Temperature Difference Flag Memory 1" is 1, further, the control unit 220 can determine whether T12 is greater than the difference between T12set and T3, and continuously satisfies the duration t3. Among them, the preset third temperature difference change allowable deviation value T3 can refer to the low temperature deviation, and t3 can be set differently according to different systems.

[0218] S717: If T12 > T12set - T3 and continuously satisfies the duration t3, then the constant temperature difference control mode can be switched to the constant flow control mode, and control PID_out after = PID_out before.

[0219] As an example, if T12 > T12set - T3 and continuously satisfies the duration t3, the unit operation mode can be automatically converted from the constant temperature difference control to the constant flow control. In addition, the instantaneous pump control output before and after the mode switch can be kept the same to ensure that the pump opening does not mutate before and after the control source mode switch.

[0220] As an example, in the temperature difference control mode, when T12 > T12set - T3, it indicates that the low temperature difference situation has been stably controlled in the temperature difference control mode. The constant temperature difference control mode can be switched to the constant flow control mode according to the indication that the status bit of "Flow Automatic Conversion to Temperature Difference Flag Memory 1" is "1".

[0221] S718: After T12 > T12set - T3 and continuously satisfies the duration t3, the status bit of "Flow Automatic Conversion to Temperature Difference Flag Memory 1" can be set to 0.

[0222] S719: When the condition determination in S714 is yes, it can be further determined that T12 is less than the sum of the preset temperature difference value and the preset fourth temperature difference change allowable deviation value T4, and continuously satisfies the preset fifth duration t4.

[0223] That is, when the control unit 20 determines that the status bit of the system "flow automatic conversion to temperature difference flag memory 2" is 1, further, the control unit 20 can determine whether T12 is less than the sum of T12set and T4 and continuously meets the duration t4, and t4 can be set differently according to different systems.

[0224] S720: After T12 < T12set + T4 and continuously meets the duration t4, the constant temperature difference control mode can be switched to the constant flow control mode, and control PID_out after = PID_out before.

[0225] As an example, after T12 satisfies T12 < T12set + T4 and continuously meets the duration t4, the unit operation mode can be automatically switched from the constant temperature difference control to the constant flow control. In addition, the instantaneous water pump control output before and after the mode switch can be kept the same to ensure that the water pump opening does not suddenly change before and after the control source mode switch.

[0226] As an example, in the temperature difference control mode, when T12 is less than the sum of T12set and T4, it indicates that the high temperature difference situation has been stably controlled in the temperature difference control mode. According to the indication that the status bit of "flow automatic conversion to temperature difference flag memory 2" is "1", the constant temperature difference control mode can be switched to the constant flow control mode.

[0227] S721: After T12 satisfies T12 < T12set + T4 and continuously meets the duration t4, the status bit of "flow automatic conversion to temperature difference flag memory 2" can be set to "0".

[0228] S722: When the condition determination in S716 is no and / or the condition determination in S719 is no, the current control mode can be maintained.

[0229] As an example, when the control unit 220 determines that T12 does not satisfy the condition of T12 > T12set - T3 and continuously meets the duration t3, the unit operation mode can be maintained in the current control mode, that is, still the constant temperature difference control mode.

[0230] As an example, when the condition determination in S719 is no, that is, when the control unit 220 determines that T12 does not satisfy the condition of T12 < T12set + T4 and continuously meets the duration t4, the unit operation mode can be maintained in the current control mode, that is, still the constant temperature difference control mode.

[0231] Through the steps of the above Example 2, when the system is selected as the constant flow control, it can also have the function of automatically converting the constant flow control to the temperature difference control, that is, the present application can not only achieve the differential pressure and temperature difference linkage control, but also achieve the flow and temperature difference linkage control. It realizes the operation of the data center refrigeration system with high efficiency and energy saving and high reliability, and meets the demand of energy consumption reduction in the data center.

[0232] Through the description of the above embodiments, those skilled in the art can clearly understand that the method according to the above embodiments can be implemented by means of software plus a necessary general hardware platform. Of course, it can also be implemented by hardware, but in many cases the former is a better implementation. Based on such an understanding, the technical solution of the present application, in essence, or the part that contributes to the prior art, can be embodied in the form of a software product. The computer software product is stored in a storage medium (such as ROM / RAM, magnetic disk, optical disk), and includes several instructions for causing a terminal device (which can be a mobile phone, a computer, a server, or a network device, etc.) to execute the methods described in various embodiments of the present application.

[0233] An embodiment of the present application also provides a computer-readable storage medium, in which a computer program is stored. Wherein, the computer program is configured to execute the steps in any one of the above method embodiments when running.

[0234] In an exemplary embodiment, the above computer-readable storage medium may include, but is not limited to: USB flash drive, read-only memory (abbreviated as ROM), random access memory (abbreviated as RAM), mobile hard disk, magnetic disk or optical disk and other various media that can store computer programs.

[0235] Figure 8 is a structural block diagram of an electronic device according to an embodiment of the present application. As Figure 8 shown, an embodiment of the present application also provides an electronic device 80, including a memory 801 and a processor 802. A computer program is stored in the memory 801, and the processor is configured to run the computer program to execute the steps in any one of the above method embodiments.

[0236] In an exemplary embodiment, the above electronic device may further include a transmission device and an input / output device. Wherein, the transmission device is connected to the above processor, and the input / output device is connected to the above processor.

[0237] The specific examples in this embodiment may refer to the examples described in the above embodiments and exemplary embodiments, and will not be repeated here.

[0238] An embodiment of the present application also provides a computer program product, including a computer program, and the computer program realizes the steps in any one of the above method embodiments when executed by a processor.

[0239] Obviously, those skilled in the art should understand that the various modules or steps of the present application described above can be implemented by a general-purpose computing device. They can be concentrated on a single computing device or distributed on a network composed of multiple computing devices. They can be implemented by program codes executable by the computing device. Thus, they can be stored in a storage device and executed by the computing device. And in some cases, the steps shown or described can be executed in a different order from here, or they can be separately made into individual integrated circuit modules, or multiple modules or steps among them can be made into a single integrated circuit module for implementation. In this way, the present application is not limited to any specific combination of hardware and software.

[0240] The foregoing is only a preferred embodiment of the present application and is not intended to limit the present application. For those skilled in the art, the present application can have various changes and modifications. Any modification, equivalent replacement, improvement, etc. made within the principle of the present application shall be included within the protection scope of the present application.

Claims

1. A control method for a liquid cooling system, characterized in that, Including: Determine that the current operating mode of the liquid cooling system is the constant pressure difference control mode, and obtain the supply-return liquid pressure difference between the supply liquid pressure and the return liquid pressure in the constant pressure difference control mode; According to the supply-return liquid pressure difference and a preset first control mode switching condition, switch the constant pressure difference control mode to a constant temperature difference control mode; In the constant temperature difference control mode, adjust the supply-return liquid flow rate to adjust the supply-return liquid temperature difference between the supply liquid temperature and the return liquid temperature, and according to the adjusted supply-return liquid temperature difference and a preset second control mode switching condition, switch the constant temperature difference control mode to the constant pressure difference control mode.

2. The method according to claim 1, wherein Wherein, The first control mode switching condition is that the supply-return liquid pressure difference is less than the sum of a preset pressure difference and a preset allowable deviation value of the pressure difference change, and greater than the difference between the preset pressure difference and the preset allowable deviation value of the pressure difference change, and continuously satisfies a preset first duration.

3. The method according to claim 2, wherein The switching of the constant pressure difference control mode to the constant temperature difference control mode includes: When the supply-return liquid pressure difference satisfies the first control mode switching condition, maintain the current opening degree of the circulation pump in the liquid cooling system, and obtain the current supply-return liquid temperature difference; Determine that the supply-return liquid temperature difference satisfies a preset third control mode switching condition; the third control mode switching condition is that the supply-return liquid temperature difference is less than the difference between a preset temperature difference and a preset first allowable deviation value of the temperature difference change, and continuously satisfies a preset second duration; Switch the constant pressure difference control mode to the constant temperature difference control mode.

4. The method according to claim 3, wherein The adjusting of the supply-return liquid flow rate in the constant temperature difference control mode includes: When the supply-return liquid temperature difference satisfies the third control mode switching condition, control the opening degree of the circulation pump to be reduced to reduce the supply-return liquid flow rate.

5. The method according to claim 3, wherein It also includes: After the supply-return liquid temperature difference is less than the difference between the preset temperature difference and the preset first allowable deviation value of the temperature difference change, and continuously satisfies the preset second duration, output a first status bit and a first value of the first status bit; Wherein, the first value of the first status bit is used to indicate that the constant pressure difference control mode has been switched to the constant temperature difference control mode.

6. The method according to claim 3, characterized in that, The switching of the constant pressure difference control mode to the constant temperature difference control mode includes: When the supply-return liquid pressure difference satisfies the first control mode switching condition, obtain the current supply-return liquid temperature difference; Determine that the supply-return liquid temperature difference satisfies a preset fourth control mode switching condition; the fourth control mode switching condition is that the supply-return liquid temperature difference is greater than the sum of a preset temperature difference and a preset second allowable deviation value of the temperature difference change, and continuously satisfies a preset third duration; Switch the constant pressure difference control mode to the constant temperature difference control mode.

7. The method according to claim 6, wherein The adjusting of the supply-return liquid flow rate in the constant temperature difference control mode includes: When the supply-return liquid temperature difference satisfies the fourth control mode switching condition, control the opening degree of the circulation pump to be increased to increase the supply-return liquid flow rate.

8. The method according to claim 6, wherein When the difference between the supply and return hydraulic pressures is greater than the sum of the preset temperature difference value and the preset allowable deviation value of the second temperature difference change, and continuously satisfies the preset third duration, output the second status bit and the first value of the second status bit; Among them, the first value of the second status bit is used to indicate that the constant pressure difference control mode has been switched to the constant temperature difference control mode.

9. The method according to claim 7, wherein It also includes: When the temperature difference value between the supply and return liquids is less than or equal to the sum of the preset temperature difference value and the preset allowable deviation value of the second temperature difference change, and greater than or equal to the difference between the preset temperature difference value and the preset allowable deviation value of the first temperature difference change, control the circulation pump to maintain the current opening degree.

10. The method according to claim 2, wherein It also includes: Determine that the difference between the supply and return hydraulic pressures does not meet the first control mode switching condition, and under the constant pressure difference control mode, adjust the supply and return liquid flow rate to adjust the difference between the supply and return hydraulic pressures.

11. The method according to claim 10, wherein, The adjusting the supply and return liquid flow rate under the constant pressure difference control mode includes: When the difference between the supply and return hydraulic pressures is greater than or equal to the sum of the preset pressure difference value and the preset allowable deviation value of the pressure difference change, control the opening degree of the circulation pump in the liquid cooling system to be reduced to reduce the supply and return liquid flow rate; or When the difference between the supply and return hydraulic pressures is less than or equal to the difference between the preset pressure difference value and the preset allowable deviation value of the pressure difference change, control the opening degree of the circulation pump in the liquid cooling system to be increased to increase the supply and return liquid flow rate.

12. The method according to claim 8, wherein The second control mode switching condition includes at least one of the following: The temperature difference value between the supply and return liquids is greater than the difference between the preset temperature difference value and the preset allowable deviation value of the third temperature difference change, and continuously satisfies the preset fourth duration; The temperature difference value between the supply and return liquids is less than or equal to the sum of the preset temperature difference value and the preset allowable deviation value of the fourth temperature difference change, and continuously satisfies the preset fifth duration.

13. The method according to claim 12, characterized in that The switching the constant temperature difference control mode to the constant pressure difference control mode according to the adjusted temperature difference value between the supply and return liquids and the preset second control mode switching condition includes: Determine that the value of the current first status bit in the constant temperature difference control mode is the first value; Determine that the current temperature difference value between the supply and return liquids is greater than the difference between the preset temperature difference value and the preset allowable deviation value of the third temperature difference change, and continuously satisfies the preset fourth duration, and switch the constant temperature difference control mode to the constant pressure difference control mode.

14. The method according to claim 12, wherein It also includes: After the temperature difference value between the supply and return liquids is greater than the difference between the preset temperature difference value and the preset allowable deviation value of the third temperature difference change, and continuously satisfies the preset fourth duration, switch the first value of the first status bit to the second value.

15. The method according to claim 12, characterized in that, The switching the constant temperature difference control mode to the constant pressure difference control mode according to the adjusted temperature difference value between the supply and return liquids and the preset second control mode switching condition includes: Determine that the value of the current second status bit in the constant temperature difference control mode is the first value; Determine that the current temperature difference value between the supply and return liquids is less than the sum of the preset temperature difference value and the preset allowable deviation value of the fourth temperature difference change, and continuously satisfies the preset fifth duration, and switch the constant temperature difference control mode to the constant pressure difference control mode.

16. The method according to claim 15, wherein It also includes: When the difference between the supply liquid temperature and the return liquid temperature is less than the sum of the preset temperature difference value and the preset allowable deviation value of the fourth temperature difference change, and continuously satisfies the preset fifth duration, switch the first value of the second status bit to the second value.

17. The method according to claim 8, wherein It further includes: Determine that the value of the current first status bit in the constant temperature difference control mode is not the first value, and the value of the current second status bit is not the first value, and maintain the constant temperature difference control mode.

18. The method according to claim 1, characterized in that, It further includes: Determine that the current operating mode of the liquid cooling system is not the constant pressure difference control mode and not the constant temperature difference control mode, and determine the constant flow control mode as the current operating mode of the liquid cooling system.

19. The method according to claim 18, wherein It further includes: Obtain the current flow value in the constant flow control mode; According to the current flow value and the preset fifth control mode switching condition, switch the constant flow control mode to the constant temperature difference control mode, and output the third status bit and the first value of the third status bit; Wherein, the first value of the third status bit is used to indicate that the constant flow control mode has been switched to the constant temperature difference control mode.

20. The method according to claim 19, wherein It further includes: In the constant temperature difference control mode, adjust the supply liquid flow or the return liquid flow to adjust the temperature difference between the supply liquid temperature and the return liquid temperature, and according to the adjusted temperature difference between the supply liquid and the return liquid and the preset sixth control mode switching condition, switch the constant temperature difference control mode to the constant flow control mode.

21. The method according to claim 19, wherein Wherein, The fifth control mode switching condition is that the current flow value is less than the sum of the preset flow value and the preset allowable deviation value of the flow change, and greater than the difference between the preset flow value and the preset allowable deviation value of the flow change, and continuously satisfies the preset sixth duration.

22. The method according to claim 20, wherein Among them, The sixth control mode switching condition includes at least one of the following: The temperature difference between the supply liquid and the return liquid is greater than or equal to the difference between the preset temperature difference value and the preset allowable deviation value of the third temperature difference change, and continuously satisfies the preset fourth duration, and the first value of the third status bit is switched to the second value; the second value of the third status bit is used to indicate that the constant temperature difference control mode is switched to the constant flow control mode; The temperature difference between the supply liquid and the return liquid is less than or equal to the sum of the preset temperature difference value and the preset allowable deviation value of the fourth temperature difference change, and continuously satisfies the preset fifth duration, and the first value of the third status bit is switched to the second value.

23. A computer-readable storage medium, characterized in that, The computer-readable storage medium stores a computer program, wherein the computer program, when executed by a processor, implements the steps of the method described in any one of claims 1 to 22.

24. An electronic device, comprising a memory, a processor, and a computer program stored on the memory and executable on the processor, characterized in that, When the processor executes the computer program, it implements the steps of the method described in any one of claims 1 to 22.

25. A computer program product, including a computer program, which, when executed by a processor, implements the steps of the method described in any one of claims 1 to 22.

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