Photovoltaic water storage cooling air conditioning system and control method thereof

Abstract

The present invention provides a photovoltaic water-cooled air-conditioning system and a control method thereof, the system comprising a cold storage tank, a refrigerator, a water pump, and a photovoltaic assembly capable of providing power to a refrigeration module in the cold storage tank, refrigerator, and / or water pump, wherein the cold storage tank is equipped with a first pipe and a second pipe, the first pipe being sequentially provided with a first regulating valve, a second regulating valve, and a water pump, the second pipe being connected to a third regulating valve, a third pipe being provided between the second regulating valve and the third regulating valve, a fourth regulating valve being provided on the third pipe, a pressure differential sensor being connected between the refrigerator and the first regulating valve, and a pressure differential bypass valve being connected in parallel to the pressure differential sensor; the control method is based on the above-mentioned air-conditioning system. The invention adopts a single-pump operation mode, which effectively reduces system complexity and initial investment, and can also increase the outlet water temperature of the refrigerator, improve system energy efficiency, enhance building energy conservation, and promote the achievement of carbon peak.

Description

Technical Field

[0001] The present invention relates to the field of heating and ventilation, and more particularly to a photovoltaic water cooling air conditioning system. Background Art

[0002] Photovoltaic energy storage technology has matured and is gradually being applied in the HVAC sector. Photovoltaic air conditioning cold storage technology is used to achieve building energy conservation and reduce carbon emissions. However, existing photovoltaic energy storage ice storage systems mostly use multiple water pumps to deliver cold water and plate heat exchangers for heat exchange. This not only increases the initial system investment but also results in higher temperatures in the cold storage tank, affecting the quality of the energy supplied. Furthermore, conventional photovoltaic energy storage ice storage systems require buffering of the cold storage tank during cooling, which reduces load response speed. Summary of the Invention

[0003] In order to solve the above problems, the present invention provides a photovoltaic water storage air-conditioning system and its control method. The invention adopts a single-pump operation mode, which effectively reduces the system complexity and initial investment, and can also increase the outlet water temperature of the refrigerator, improve the system energy efficiency, improve the building energy conservation level, and promote the realization of carbon peak.

[0004] The present invention provides a photovoltaic water cold storage air conditioning system, comprising a cold storage tank, a refrigerator, a water pump, and a photovoltaic assembly that can provide electricity, wherein the cold storage tank is installed with a first pipe and a second pipe, the other ends of the first pipe and the second pipe are connected to the refrigerator, the first pipe is sequentially provided with a first regulating valve, a second regulating valve, and a water pump, the second pipe is connected to a third regulating valve, a third pipe is connected between the second regulating valve and the third regulating valve, the third pipe is provided with a fourth regulating valve, the refrigerator is connected to a chilled water return pipe and a chilled water supply pipe, the chilled water return pipe is connected to the first pipe, and the chilled water supply pipe is connected to the second pipe.

[0005] As a further optimization of the present invention, the refrigeration machine is connected to a chilled water return pipe and a chilled water supply pipe. The chilled water return pipe is connected to the first pipe, and the chilled water supply pipe is connected to the second pipe. A pressure differential sensor is provided between the two pipes, and a pressure differential bypass valve is connected in parallel to the pressure differential sensor.

[0006] As a further optimization of the present invention, a high-temperature pipe pressure sensor is connected between the cold storage tank and the first regulating valve, and a first stop valve is provided on the high-temperature pipe pressure sensor; a high-temperature pipe temperature sensor is provided on the first pipeline.

[0007] As a further optimization of the present invention, a low-temperature pipe pressure sensor is connected between the cold storage tank and the third regulating valve, and a second stop valve is provided on the low-temperature pipe pressure sensor; a low-temperature pipe temperature sensor is provided on the second pipeline.

[0008] As a further optimization of the present invention, the refrigeration module in the cold storage tank, refrigerator and / or water pump is connected to a bidirectional meter that can read real-time power and count electric energy in forward and reverse directions, and the other end of the bidirectional meter is connected to the mains power supply to achieve: when the excess power generation of the photovoltaic module is not sufficient to meet the needs of the refrigeration module, the mains power is supplied to the refrigeration module through the bidirectional meter; when the excess power generation of the photovoltaic module is greater than the needs of the refrigeration module, power is supplied to the mains power.

[0009] As a further optimization of the present invention, the cold storage tank is a closed water tank, and an automatic exhaust valve is provided on the closed water tank.

[0010] As a further optimization of the present invention, the cold storage tank is an open water tank, and the liquid level of the open water tank completely immerses the first pipe and the second pipe by a distance greater than 500 mm.

[0011] As a further optimization of the present invention, an anti-vortex device is provided on the open water tank.

[0012] As a further optimization of the present invention, the installation height of the open water tank is 3m-5m greater than the height of the constant pressure point.

[0013] As a further optimization of the present invention, a water replenishing device is provided on the cold storage tank.

[0014] As a further optimization of the present invention, the first regulating valve, the second regulating valve, the third regulating valve and the fourth regulating valve are all electric proportional regulating valves.

[0015] The present invention also provides a control method for a photovoltaic water storage air conditioning system, which includes an air conditioning cooling mode, an air conditioning cooling and cold storage mode, an air conditioning cooling and cooling release mode, and a cooling release mode:

[0016] When the system is set to air conditioning cooling mode, the opening method is as follows: the first regulating valve, the fourth regulating valve, and the third regulating valve are closed; the second regulating valve is opened; the pressure regulating valve is in automatic adjustment state; the water pump is in automatic adjustment state;

[0017] When the system is in air conditioning cooling and cold storage mode, the opening mode is: the fourth regulating valve is closed; the second regulating valve is opened; the first regulating valve and the third regulating valve are in automatic adjustment mode; the water pump is automatically adjusted; the pressure differential bypass valve is in automatic adjustment mode;

[0018] When the system is in cooling mode, the opening method is: the fourth regulating valve is opened; the second regulating valve and the third regulating valve are closed;

[0019] When the system is in air conditioning cooling and cooling mode, the opening method is: the second regulating valve and the fourth regulating valve are open; the first regulating valve and the third regulating valve are closed; the pressure differential bypass valve is in automatic adjustment mode.

[0020] As a further optimization of the present invention, the above-mentioned valve and water pump adjustment methods all adopt PID control method. The specific parameters should be debugged according to the actual project.

[0021] As a further optimization of the present invention, when the system is set to air conditioning cooling mode, the operation mode is: the water pump automatically adjusts according to the system load, collects pressure sensor data, and performs load increase and decrease control according to the constant pressure difference control mode; the pressure difference bypass valve performs bypass adjustment after the water pump adjustment limit;

[0022] When the system is in air conditioning cooling and cold storage mode, its operation mode is as follows: when the third regulating valve is in the open state, the water pump adjusts the main unit load rate to keep the two-way electric meter in the positive zero state; when the third regulating valve is in the closed state, if the pressure difference of the pressure sensor is still not satisfied, the water pump switches to regulating the pressure sensor constant pressure difference control; the first regulating valve is slowly opened from the closed state to the set pressure, and the third regulating valve is slowly opened from the closed state to adjust the pressure sensor to the system set pressure difference;

[0023] When the system is in cooling mode, the operation mode is: the water pump automatically adjusts according to the system load, collects pressure sensor data, and performs load increase and decrease control according to the constant pressure difference control method, and the first regulating valve is adjusted to the set pressure.

[0024] When the system is in air conditioning cooling and cooling mode, the operation mode is: the water pump automatically adjusts according to the system load, collects pressure sensor data, and performs load increase and decrease control according to the constant pressure difference control method. When the host is fully loaded, the first regulating valve gradually opens and enters the adjustment mode to control the host water outlet temperature to be stable at the set temperature.

[0025] Compared with the prior art, the present invention has the following beneficial effects:

[0026] The present invention adopts a single pump system design, which reduces the complexity of the system from a structural perspective compared to conventional cold storage systems, reduces the initial investment of the system, and reduces the difficulty of control. Conventional cold storage systems mostly use plate heat exchangers for heat exchange. There is a heat exchange temperature difference between cold storage and cold release. The final supply temperature of the cold storage tank is 3-4°C higher than the main machine outlet water temperature. After eliminating the heat exchanger, the outlet water temperature of the cold storage tank can be approximately equal to the outlet water temperature of the main machine, thereby improving the energy quality supplied by the cold storage tank.

[0027] This invention meets the terminal water supply temperature requirements without reducing the main unit's water outlet temperature, thereby improving the main unit's energy efficiency. When the chiller is providing cooling alone without cold storage, the chilled water directly provides cooling without passing through the cold storage tank. This eliminates the need for a cold storage tank buffer and provides a rapid response to load changes. The cold storage tank's water inflow is constant, and the tank body can be a sealed tank specifically designed for air conditioning systems, an open water tank, or a fire water tank, offering greater adaptability.

[0028] The present invention drives photovoltaic air conditioning for cooling through photovoltaic power generation, and tracks the generated power in real time. By changing the load rate of the refrigerator, all the generated power is used for refrigerator cooling. While ensuring the terminal cooling load demand, the excess cooling capacity is stored in the cold storage tank and applied to nighttime air conditioning cooling. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Hereinafter, the present invention will be described in more detail based on embodiments with reference to the accompanying drawings.

[0030] Figure 1 This is a system diagram of the photovoltaic water storage air conditioning system of the present invention;

[0031] Figure 2 It is a diagram of the electrical energy flow system.

[0032] In the drawings, like parts are given like reference numerals, but the drawings are not necessarily drawn to scale. DETAILED DESCRIPTION

[0033] The following describes the implementation of the present invention using specific embodiments. Those skilled in the art will readily understand the other advantages and benefits of the present invention from the disclosure herein. Obviously, the embodiments described are only a portion of the present invention, not all of it. All other embodiments derived by persons of ordinary skill in the art based on the embodiments of the present invention without inventive effort are intended to fall within the scope of protection of the present invention.

[0034] The terms used in the embodiments of the present invention are for the purpose of describing specific embodiments only and are not intended to limit the present invention. The singular forms "a," "the," and "the" used in the embodiments of the present invention and the appended claims are also intended to include plural forms, unless the context clearly indicates otherwise. "A plurality" generally includes at least two, but does not exclude the inclusion of at least one.

[0035] It should also be noted that the terms "include", "comprising" or any other variations thereof are intended to cover non-exclusive inclusion, so that a product or system comprising a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such product or system. In the absence of further restrictions, an element defined by the sentence "comprising a ..." does not exclude the presence of other identical elements in the product or system comprising the element. In the description of the present invention, it should be understood that the terms "upper", "lower", "bottom", "top", "front", "back", "inside", "outside", "left", "right" and the like indicate an orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0036] The embodiments of the present invention are described below with reference to the accompanying drawings.

[0037] like Figure 1 and Figure 2 As shown, the present invention provides a photovoltaic water cold storage air conditioning system, comprising a cold storage tank 1, a refrigerator 2, a water pump 3, and a photovoltaic assembly that can provide electricity to the cold storage tank, the refrigerator and / or the refrigeration module in the water pump, wherein the cold storage tank is provided with a water replenishment device 17; the cold storage tank 1 is installed with a first pipe 4 and a second pipe 5, and the other ends of the first pipe and the second pipe are connected to the refrigerator 2. Preferably, a first pipe 4 is installed above the cold storage tank 1, and a second pipe 5 is installed below the cold storage tank 1. The first pipe 4 is sequentially provided with a first regulating valve 18, a second regulating valve 6, and a water pump 3. The second pipe 5 is connected to a third regulating valve 7. A third pipe is connected between the second regulating valve 6 and the third regulating valve 7. The third pipe is provided with a fourth regulating valve. The chiller is connected to a chilled water return pipe and a chilled water supply pipe. The chilled water return pipe is connected to the first pipe, the chilled water supply pipe is connected to the second pipe, and the third pipe is connected between the first pipe and the second pipe. One end of the third pipe is connected between the second regulating valve and the water pump of the first pipe, and the other end is connected between the third regulating valve and the low-temperature pipe temperature sensor. The chiller is connected to a chilled water return pipe and a chilled water supply pipe. The chilled water return pipe is connected to the first pipe, the chilled water supply pipe is connected to the second pipe. A pressure differential sensor 9 is provided between the chilled water return pipe and the chilled water supply pipe. The pressure differential sensor 9 is connected in parallel with a pressure differential bypass valve 10.

[0038] The present invention adopts a single pump system design, which reduces the complexity of the system from a structural perspective compared to conventional cold storage systems, reduces the initial investment in the system, and reduces the difficulty of control. Conventional cold storage systems mostly use plate heat exchangers for heat exchange. There is a heat exchange temperature difference between cold storage and cold release. The final supply temperature of the cold storage tank is 3°C-4°C higher than the main unit water outlet temperature. After the heat exchanger is eliminated, the outlet water temperature of the cold storage tank can be approximately equal to the outlet water temperature of the main unit, thereby improving the energy quality supplied by the cold storage tank. At the same time, while meeting the terminal water supply temperature requirement, the main unit outlet water temperature is not reduced, thereby improving the main unit energy efficiency ratio. When the refrigerator is used for cooling alone without cold storage, the chilled water is directly supplied without passing through the cold storage tank. There is no cold storage tank buffer, and the load change response is fast.

[0039] In the technical solution of the present invention, photovoltaic air conditioning is driven by photovoltaic power generation for cooling, and the power generation power is tracked in real time. By changing the load rate of the refrigerator, all the power generation is used for refrigerator cooling, and while ensuring the terminal cooling load demand, the excess cooling capacity is stored in the cold storage tank and used for nighttime air conditioning cooling.

[0040] Continue as Figure 1 As shown, a high-temperature pipe pressure sensor 11 is connected between the cold storage tank 1 and the first regulating valve 18, and a first stop valve 12 is installed on the high-temperature pipe pressure sensor 11; a high-temperature pipe temperature sensor 13 is installed on the first pipeline 4. A low-temperature pipe pressure sensor 14 is connected between the cold storage tank 1 and the third regulating valve 7, and a second stop valve 15 is installed on the low-temperature pipe pressure sensor 14; and a low-temperature pipe temperature sensor 16 is installed on the second pipeline 5.

[0041] By arranging pressure sensors and temperature sensors on the first pipeline and the second pipeline, the pressure and temperature of the liquid in the pipeline can be monitored in real time.

[0042] Continue as Figure 2 As shown, the refrigeration module in the cold storage tank 1, the refrigerator 2 and / or the water pump 3 is connected to a bidirectional meter that can read real-time power and count electric energy in forward and reverse directions. The other end of the bidirectional meter is connected to the mains power supply to achieve: when the excess power generation of the photovoltaic module is not sufficient to meet the demand of the refrigeration module, the mains power is supplied to the refrigeration module through the bidirectional meter; when the excess power generation of the photovoltaic module is greater than the demand of the refrigeration module, power is supplied to the mains power.

[0043] Preferably, the water volume of the cold storage tank is equal, and the tank body can be a sealed tank specially used for air conditioning system or an open water tank, fire water tank, etc., which has higher adaptability. Specifically, when the cold storage tank is a closed water tank, the closed water tank is provided with an automatic exhaust valve.

[0044] Of course, the cold storage tank can also be an open water tank, where the liquid level in the open water tank completely submerges the first and second pipes by a distance greater than 500 mm. The open water tank is provided with a vortex preventer. The installation height of the open water tank is 3-5 meters higher than the set pressure point.

[0045] Preferably, the first regulating valve, the second regulating valve, the third regulating valve and the fourth regulating valve are all electric proportional regulating valves.

[0046] The photovoltaic water storage air conditioning system can realize four operating modes, namely air conditioning cooling mode, air conditioning cooling and cold storage mode, air conditioning cooling and cooling mode, and cooling mode.

[0047] When the system is set to air conditioning cooling mode,

[0048] Opening mode: the first regulating valve 18, the fourth regulating valve 8, and the third regulating valve 7 are closed; the second regulating valve 6 is open; the pressure regulating valve 10 is in automatic adjustment state; and the water pump 3 is in automatic adjustment state.

[0049] Operation mode: Water pump 3 automatically adjusts according to the system load, collects data from pressure sensor 9, and performs load control according to the constant pressure differential control method. The pressure differential bypass valve performs bypass adjustment after the water pump adjustment limit is reached.

[0050] When the system is in air conditioning cooling and cold storage mode,

[0051] Opening mode: the fourth regulating valve 8 is closed; the second regulating valve 6 is opened; the first regulating valve 18 and the third regulating valve 7 are in adjustment mode; the water pump 3 is automatically adjusted; the pressure differential bypass valve 10 is in automatic adjustment mode.

[0052] Operation mode: When the third regulating valve 7 is open, the water pump 3 adjusts the load rate of the main engine to keep the bidirectional electric meter always in the positive zero state. When the third regulating valve 7 is closed, if the pressure difference of the pressure sensor 9 is still not satisfied, the water pump 3 switches to the constant pressure differential control by adjusting the pressure sensor 9. The first regulating valve 18 is slowly opened from the closed state to the set pressure (i.e., the system fixed pressure point pressure), and the third regulating valve 7 is slowly opened from the closed state to adjust the pressure sensor 9 to the system set pressure differential.

[0053] When the system is in cooling mode,

[0054] Opening mode: the fourth regulating valve 8 is open; the second regulating valve 6 and the third regulating valve 7 are closed;

[0055] Operation mode: The water pump 3 automatically adjusts according to the system load, collects data from the pressure sensor 9, and performs load control according to the constant pressure difference control mode. The first regulating valve 18 is adjusted to the set pressure (i.e. the system constant pressure point pressure).

[0056] When the system is in air conditioning cooling and cooling mode,

[0057] Opening mode: the second regulating valve 6 and the fourth regulating valve 8 are open; the first regulating valve 18 and the third regulating valve 7 are closed; the pressure differential bypass valve 10 is in automatic adjustment mode.

[0058] Operation mode: Water pump 3 automatically adjusts based on system load, collects data from pressure sensor 9, and performs load control using a constant pressure differential control method. When the main unit is fully loaded, the first regulating valve 18 gradually opens, entering regulation mode, and controls the main unit's outlet water temperature to stabilize at the set temperature.

[0059] The above valves and pumps are all regulated using PID control. Specific parameters should be adjusted according to the actual project.

[0060] Obviously, the embodiments described above are only part of the embodiments of the present invention, rather than all the embodiments.

[0061] Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative work should fall within the scope of protection of the present invention.

[0062] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, they indicate the presence of features, steps, tasks, devices, components and / or combinations thereof.

[0063] The foregoing description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Those skilled in the art will readily appreciate that various modifications and variations of the present invention are possible. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. A photovoltaic water storage air conditioning system, characterized in that: It includes a cold storage tank, a refrigerator, a water pump, and a photovoltaic component that can provide electricity, wherein the cold storage tank is installed with a first pipe and a second pipe, the other ends of the first pipe and the second pipe are connected to the refrigerator, the first pipe is sequentially provided with a first regulating valve, a second regulating valve, and a water pump, the second pipe is connected with a third regulating valve, the second pipe is provided with a low-temperature pipe temperature sensor, a third pipe is connected between the second regulating valve and the third regulating valve, one end of the third pipe is connected between the second regulating valve and the water pump of the first pipe, and the other end is connected between the third regulating valve and the low-temperature pipe temperature sensor; the third pipe is provided with a fourth regulating valve, the refrigerator is connected with a chilled water return pipe and a chilled water supply pipe, the chilled water return pipe is connected to the first pipe, the chilled water supply pipe is connected to the second pipe, a pressure differential sensor is provided between the chilled water return pipe and the chilled water supply pipe, and the pressure differential sensor is connected in parallel with a pressure differential bypass valve.

2. The photovoltaic water storage air conditioning system according to claim 1, characterized in that: A high-temperature pipe pressure sensor is connected between the cold storage tank and the first regulating valve, and a first stop valve is provided on the high-temperature pipe pressure sensor; a high-temperature pipe temperature sensor is provided on the first pipeline.

3. The photovoltaic water storage air conditioning system according to claim 1, characterized in that: A low-temperature pipe pressure sensor is connected between the cold storage tank and the third regulating valve, and a second stop valve is provided on the low-temperature pipe pressure sensor; a low-temperature pipe temperature sensor is provided on the second pipeline.

4. The photovoltaic water storage air conditioning system according to claim 1, characterized in that: The refrigeration module in the cold storage tank, refrigerator and / or water pump is connected to a bidirectional meter that can read real-time power and calculate electric energy in forward and reverse directions. The other end of the bidirectional meter is connected to the mains power supply to achieve: when the excess power generation of the photovoltaic module is not enough to meet the demand of the refrigeration module, the mains power is supplied to the refrigeration module through the bidirectional meter; when the excess power generation of the photovoltaic module is more than the demand of the refrigeration module, power is supplied to the mains power.

5. The photovoltaic water storage air conditioning system according to claim 1, characterized in that: The cold storage tank is a closed water tank, and an automatic exhaust valve is provided on the closed water tank.

6. The photovoltaic water cooling air conditioning system according to claim 1, characterized in that: The cold storage tank is an open water tank, and the liquid level of the open water tank completely immerses the first pipe and the second pipe at a distance greater than 500 mm.

7. The photovoltaic water cooling air conditioning system according to claim 6, characterized in that: The open water tank is provided with an anti-vortex device.

8. The photovoltaic water cooling air conditioning system according to claim 6 or 7, characterized in that: The installation height of the open water tank is 3m-5m greater than the height of the constant pressure point.

9. The photovoltaic water storage air conditioning system according to claim 1, characterized in that: The cold storage tank is provided with a water replenishing device.

10. The photovoltaic water cooling air conditioning system according to claim 1, characterized in that: The first regulating valve, the second regulating valve, the third regulating valve and the fourth regulating valve are all electric proportional regulating valves.

11. A control method for a photovoltaic water-cooled air conditioning system, using the photovoltaic water-cooled air conditioning system according to any one of claims 1 to 10, characterized in that: The control methods are air conditioning cooling mode, air conditioning cooling and cold storage mode, air conditioning cooling and cooling mode, and cooling mode: When the system is set to air conditioning cooling mode, the opening method is as follows: the first regulating valve, the fourth regulating valve, and the third regulating valve are closed; the second regulating valve is opened; the pressure regulating valve is in automatic adjustment state; the water pump is in automatic adjustment state; When the system is in air conditioning cooling and cold storage mode, the opening mode is: the fourth regulating valve is closed; the second regulating valve is opened; the first regulating valve and the third regulating valve are in automatic adjustment mode; the water pump is automatically adjusted; the pressure differential bypass valve is in automatic adjustment mode; When the system is in cooling mode, the opening method is: the fourth regulating valve is opened; the second regulating valve and the third regulating valve are closed; When the system is in air conditioning cooling and cooling mode, the opening method is: the second regulating valve and the fourth regulating valve are open; the first regulating valve and the third regulating valve are closed; the pressure differential bypass valve is in automatic adjustment mode.

12. The control method of the photovoltaic water storage air conditioning system according to claim 11, characterized in that: The above-mentioned valves and water pumps are all regulated using PID control; the specific parameters should be debugged according to the actual project.

13. The control method of the photovoltaic water storage air conditioning system according to claim 11 or 12, characterized in that: When the system is set to air conditioning cooling mode, the operation mode is as follows: the water pump automatically adjusts according to the system load, collects pressure sensor data, and performs load increase and decrease control according to the constant pressure difference control method; the pressure difference bypass valve performs bypass adjustment after the water pump adjustment limit; When the system is in air conditioning cooling and cold storage mode, its operation mode is as follows: when the third regulating valve is in the open state, the water pump adjusts the main unit load rate to keep the two-way electric meter in the positive zero state; when the third regulating valve is in the closed state, if the pressure difference of the pressure sensor is still not satisfied, the water pump switches to regulating the pressure sensor constant pressure difference control; the first regulating valve is slowly opened from the closed state to the set pressure, and the third regulating valve is slowly opened from the closed state to adjust the pressure sensor to the system set pressure difference; When the system is in cooling mode, the operation mode is: the water pump automatically adjusts according to the system load, collects pressure sensor data, and performs load increase and decrease control according to the constant pressure difference control method, and the first regulating valve is adjusted to the set pressure; When the system is in air conditioning cooling and cooling mode, the operation mode is: the water pump automatically adjusts according to the system load, collects pressure sensor data, and performs load increase and decrease control according to the constant pressure difference control method. When the host is fully loaded, the first regulating valve gradually opens and enters the adjustment mode to control the host water outlet temperature to be stable at the set temperature.

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