Temperature control system and its control method

Abstract

This application provides a temperature control system and its control method. The temperature control system includes a first refrigerant circuit, a second refrigerant circuit, a refrigerant circuit, a first control valve, and a heat exchanger. The refrigerant circuit includes an evaporator. The first refrigerant circuit includes a first temperature control module connected to the refrigerant channel of the evaporator, used for heat exchange with a first device through the first temperature control module. The second refrigerant circuit includes a second temperature control module and a dry cooler connected in series. The outlet of the dry cooler is connected to the inlet of the second channel of the heat exchanger, and the outlet of the second channel is connected to the inlet of the second temperature control module, used for heat exchange with a second device through the second temperature control module. The first control valve is connected to the inlet of the first channel of the heat exchanger, and the outlet of the first channel is connected to the inlet of the first temperature control module; the first control valve is used to control the flow rate of the refrigerant flowing through the heat exchanger in the first refrigerant circuit. The temperature control system and its control method provided by this application improve the operating efficiency of the system and reduce energy consumption.

Description

Technical Field

[0001] This application relates to the field of temperature control technology, and in particular to a temperature control system and its control method. Background Technology

[0002] To ensure the safe and reliable operation of energy storage batteries during charging and discharging, appropriate thermal management solutions are needed to cool and control the temperature of the energy storage batteries and inverters. With the increase in energy density of energy storage power stations, liquid cooling temperature control solutions have higher reliability than traditional air cooling temperature control solutions.

[0003] In the process of developing this application, the inventors discovered that the prior art has at least the following problems: Due to the limited size of the temperature control unit, most existing technologies connect the heat dissipation device on the inverter side with the fluorine system on the battery side in series. This leads to a reduction in the operating efficiency of the temperature control unit under normal operating conditions, resulting in poor temperature stability of the energy storage battery and making it difficult to control the temperature accurately. At the same time, the existing temperature control units cannot select an appropriate temperature control method according to different ambient temperatures, resulting in high energy consumption and making it difficult to save energy and reduce costs. Summary of the Invention

[0004] Based on this, this application provides a temperature control system and its control method to improve the problems of low operating efficiency and high energy consumption of the temperature control system in the prior art.

[0005] To achieve the above objectives, the technical solution of this application embodiment is implemented as follows:

[0006] On one hand, embodiments of this application provide a temperature control system, including: a first refrigerant circuit, a second refrigerant circuit, a refrigerant circuit, a first control valve, and a heat exchanger;

[0007] The refrigerant circuit includes an evaporator, which includes a refrigerant passage and a refrigerant passage.

[0008] The heat exchanger includes a first channel and a second channel;

[0009] The first refrigerant circuit includes a first temperature control module connected to the refrigerant channel. The first refrigerant circuit is used to exchange heat with the first device through the first temperature control module in order to control the temperature of the first device.

[0010] The second refrigerant circuit includes a second temperature control module and a dry cooler connected in series. The outlet of the dry cooler is connected to the inlet of the second channel, and the outlet of the second channel is connected to the inlet of the second temperature control module. The second refrigerant circuit is used to exchange heat with the second device through the second temperature control module to control the temperature of the second device.

[0011] The first control valve is connected to the inlet of the first channel, and the outlet of the first channel is connected to the inlet of the first temperature control module; the first control valve is used to control the flow rate of the refrigerant in the first refrigerant circuit through the heat exchanger.

[0012] In one embodiment, the first refrigerant circuit includes a first temperature control module, a first filter, and a first circulation pump connected in series; the inlet of the refrigerant channel is connected to the outlet of the first circulation pump, and the outlet of the refrigerant channel is connected to the inlet of the first temperature control module.

[0013] In one embodiment, the first refrigerant circuit further includes a heater connected in series between the outlet of the refrigerant channel and the inlet of the first temperature control module.

[0014] In one embodiment, the second refrigerant circuit includes a second temperature control module, a second filter, a second circulation pump, and the dry cooler connected in series; the outlet of the dry cooler is connected to the inlet of the second channel.

[0015] In one embodiment, the refrigerant circuit includes a compressor, a condenser, a third filter, an expansion valve, and the evaporator connected in series.

[0016] In one embodiment, the first control valve is a two-way valve, and the outlet of the first control valve is connected to the inlet of the first channel;

[0017] The inlet of the first control valve is connected between the outlet of the first circulating pump and the inlet of the refrigerant channel, and the outlet of the first channel is connected between the outlet of the refrigerant channel and the inlet of the first temperature control module; or,

[0018] The inlet of the first control valve is connected between the outlet of the first circulating pump and the inlet of the refrigerant channel, the outlet of the first channel is connected between the outlet of the first circulating pump and the inlet of the refrigerant channel, and the connection point of the outlet of the first channel on the first refrigerant circuit is closer to the inlet of the refrigerant channel than the connection point of the inlet of the first control valve on the first refrigerant circuit; or,

[0019] The inlet of the first control valve is connected between the outlet of the refrigerant channel and the inlet of the first temperature control module, and the outlet of the first channel is connected to the inlet of the first temperature control module.

[0020] In one embodiment, the temperature control system further includes a liquid replenishment device and an expansion tank. The liquid replenishment device is connected to the first refrigerant circuit via a second control valve, and the bottom of the expansion tank is connected to the first refrigerant circuit and the second refrigerant circuit via pipelines.

[0021] On the other hand, embodiments of this application provide a control method for a temperature control system, the temperature control system comprising: a first refrigerant circuit, a second refrigerant circuit, a refrigerant circuit, a first control valve, and a heat exchanger;

[0022] The refrigerant circuit includes a compressor and an evaporator connected in series, and the evaporator includes a refrigerant passage and a refrigerant passage.

[0023] The heat exchanger includes a first channel and a second channel;

[0024] The first refrigerant circuit includes a first temperature control module connected to the refrigerant channel. The first refrigerant circuit is used to exchange heat with the first device through the first temperature control module in order to control the temperature of the first device.

[0025] The second refrigerant circuit includes a second temperature control module and a dry cooler connected in series. The outlet of the dry cooler is connected to the inlet of the second channel, and the outlet of the second channel is connected to the inlet of the second temperature control module. The second refrigerant circuit is used to exchange heat with the second device through the second temperature control module to control the temperature of the second device.

[0026] The first control valve is connected to the inlet of the first channel, and the outlet of the first channel is connected to the inlet of the first temperature control module; the first control valve is used to control the flow rate of the refrigerant in the first refrigerant circuit through the heat exchanger.

[0027] The control method of the temperature control system includes:

[0028] First cooling control step: control the compressor to start, control the first control valve to make the refrigerant flowing out of the first temperature control module pass through the evaporator and not through the heat exchanger;

[0029] The second cooling control step is to control the compressor to start and control the first control valve so that the refrigerant flowing out of the first temperature control module passes through both the evaporator and the heat exchanger.

[0030] The third cooling control step: control the compressor to start, and control the first control valve to make the refrigerant flowing out of the first temperature control module pass through the evaporator instead of the heat exchanger;

[0031] Fourth cooling control step: Control the compressor to shut down, and control the first control valve so that the refrigerant flowing out of the first temperature control module passes through both the evaporator and the heat exchanger.

[0032] In one embodiment, when the ambient temperature is greater than 45°C and not greater than 55°C, if the first device has a cooling requirement, the first cooling control step is executed.

[0033] When the ambient temperature is greater than 35℃ but not greater than 45℃, if the first device has a cooling requirement, the second cooling control step shall be executed.

[0034] When the ambient temperature is greater than 0℃ and not greater than 35℃, if the first device has a cooling requirement, the third cooling control step shall be executed.

[0035] When the ambient temperature is not less than -30℃ and not greater than 0℃, if the first device has a cooling requirement, the fourth cooling control step shall be executed.

[0036] In one embodiment, the first cooling control step further includes: collecting the inlet temperatures of the first temperature control module and the second temperature control module respectively, and adjusting the speed of the compressor according to the inlet temperature of the first temperature control module so that the inlet temperature of the first temperature control module is within a first preset temperature range; and adjusting the fan speed of the dry cooler according to the inlet temperature of the second temperature control module so that the inlet temperature of the second temperature control module is within a second preset temperature range.

[0037] The second cooling control step further includes: collecting the inlet temperatures of the first temperature control module and the second temperature control module respectively, and adjusting the speed of the compressor, the opening degree of the first control valve and the fan speed of the dry cooler according to the inlet temperatures of the first temperature control module and the second temperature control module, so that the inlet temperature of the first temperature control module is within the first preset temperature range and the inlet temperature of the second temperature control module is within the second preset temperature range.

[0038] The third cooling control step further includes: collecting the inlet temperatures of the first temperature control module and the second temperature control module respectively, and adjusting the speed of the compressor according to the inlet temperature of the first temperature control module so that the inlet temperature of the first temperature control module is within the first preset temperature range; adjusting the fan speed of the dry cooler according to the inlet temperature of the second temperature control module so that the inlet temperature of the second temperature control module is within the second preset temperature range.

[0039] The fourth cooling control step further includes: collecting the inlet temperatures of the first temperature control module and the second temperature control module respectively, and adjusting the opening degree of the first control valve and the fan speed of the dry cooler according to the inlet temperatures of the first temperature control module and the second temperature control module, so that the inlet temperature of the first temperature control module is within the first preset temperature range and the inlet temperature of the second temperature control module is within the second preset temperature range.

[0040] This application has at least the following beneficial effects: The temperature control system and its control method of this application, by setting a first control valve and a heat exchanger, enable the temperature control system to realize multiple temperature control modes. Combined with the dry cooler in the second refrigerant circuit, it can maximize the utilization of natural energy, reduce energy consumption, improve the operating efficiency of the temperature control system, ensure the accuracy of temperature control, and ensure the stable and reliable operation of the first and second equipment. Attached Figure Description

[0041] Figure 1 This is a schematic diagram of the structure of a temperature control system according to an embodiment of this application (first connection method).

[0042] Figure 2 This is a schematic diagram of the structure of a temperature control system according to another embodiment of this application (second connection method).

[0043] Figure 3 This is a schematic diagram of the structure of a temperature control system according to another embodiment of this application (third connection method).

[0044] The arrows in the above figures indicate the circulation direction of each circuit (first refrigerant circuit, second refrigerant circuit, and refrigerant circuit).

[0045] The meanings of the labels in the attached diagram are as follows:

[0046] 1. First refrigerant circuit; 11. First temperature control module; 12. First filter; 13. First circulation pump; 14. Heater;

[0047] 2. Second refrigerant circuit; 21. Second temperature control module; 22. Second filter; 23. Second circulation pump; 24. Dry cooler;

[0048] 3. Refrigerant circuit; 31. Compressor; 32. Condenser; 33. Third filter; 34. Expansion valve; 35. Evaporator;

[0049] 4. First control valve; 5. Heat exchanger; 6. Temperature sensor; 7. Pressure sensor; 8. Expansion tank; 9. Second control valve. Detailed Implementation

[0050] The technical solution of this application will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0051] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein in the specification of this application is for the purpose of describing particular embodiments only and is not intended to limit the ways in which this application may be implemented. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0052] In the description of this application, it should be understood that the terms "center," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, are used only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on this application. In the description of this application, unless otherwise stated, "a plurality of" means two or more.

[0053] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0054] Please see Figures 1 to 3 The temperature control system of this application embodiment includes: a first refrigerant circuit 1, a second refrigerant circuit 2, a refrigerant circuit 3, a first control valve 4, and a heat exchanger 5.

[0055] The refrigerant circuit 3 includes an evaporator 35, which includes a refrigerant passage and a refrigerant passage. The refrigerant passage is used for the flow of refrigerant, and the refrigerant passage is used for the flow of refrigerant. The refrigerant and refrigerant in the evaporator can exchange heat in the two passages (the refrigerant passage and the refrigerant passage).

[0056] The heat exchanger 5 includes a first channel and a second channel. The refrigerant in the first channel and the second channel can exchange heat at the heat exchanger.

[0057] The first refrigerant circuit 1 includes a first temperature control module 11 connected to the refrigerant channel of the evaporator 35. The first temperature control module 11 is connected to the refrigerant channel of the evaporator 35. The first refrigerant circuit 1 is used to exchange heat with the first device through the first temperature control module 11 to control the temperature of the first device.

[0058] The second refrigerant circuit 2 includes a second temperature control module 21 and a dry cooler 24 connected in series. The outlet of the dry cooler 24 is connected to the inlet of the second channel of the heat exchanger 5, and the outlet of the second channel of the heat exchanger 5 is connected to the inlet of the second temperature control module 21. The second refrigerant circuit 2 is used to exchange heat with the second device through the second temperature control module 21 to control the temperature of the second device.

[0059] The first control valve 4 is connected to the inlet of the first channel of the heat exchanger 5 through a pipeline, and the outlet of the first channel of the heat exchanger 5 is connected to the inlet of the first temperature control module 11; the first control valve 4 is used to control the flow rate of the refrigerant in the first refrigerant circuit 1 through the heat exchanger 5.

[0060] Specifically, in this embodiment, the first device (not shown) may be, for example, an energy storage battery, and the second device (not shown) may be, for example, an inverter. The inverter has a higher temperature tolerance than the energy storage battery. It exchanges heat with the first device through the refrigerant in the first temperature control module 11, and with the second device through the refrigerant in the second temperature control module 21. The first refrigerant circuit 1 includes the first temperature control module 11, the first filter 12, and the first circulation pump 13 connected in series. The inlet of the refrigerant channel of the evaporator 35 is connected to the outlet of the first circulation pump 13, and the outlet of the refrigerant channel of the evaporator 35 is connected to the inlet of the first temperature control module 11. To meet the heating requirements of the first device under certain circumstances, a heater 14 may also be provided in the first refrigerant circuit 1, such as a PTC heater 14 (composed of a PTC ceramic heating element and an aluminum tube). This type of PTC heater 14 has the advantages of low thermal resistance and high heat exchange efficiency, and is an automatic constant temperature and energy-saving electric heater 14. The heater 14 can be connected in series between the outlet of the refrigerant channel of the evaporator 35 and the inlet of the first temperature control module 11. To achieve precise temperature control of the first refrigerant circuit 1, a temperature sensor 6 and a pressure sensor 7 can be connected in series at the inlet and outlet ends of the first temperature control module 11, respectively, to detect the inlet temperature and pressure of the first temperature control module 11, as well as the outlet temperature and pressure of the first temperature control module 11.

[0061] The second refrigerant circuit 2 includes a second temperature control module 21, a second filter 22, a second circulating pump 23, and a dry cooler 24 connected in series. The outlet of the dry cooler 24 is connected to the inlet of the second channel of the heat exchanger 5, and the outlet of the second channel of the heat exchanger 5 is connected to the inlet of the second temperature control module 21. To achieve precise temperature control of the second refrigerant circuit 2, a temperature sensor 6 and a pressure sensor 7 can be connected in series at the inlet and outlet ends of the second temperature control module 21, respectively, to detect the inlet temperature and pressure of the second temperature control module 21, as well as the outlet temperature and pressure of the second temperature control module 21.

[0062] The refrigerant circuit 3 includes a compressor 31, a condenser 32, a third filter 33, an expansion valve 34, and an evaporator 35 connected in series. The condenser 32 can be, for example, a plate heat exchanger or a coil heat exchanger, and the evaporator 35 can also be a plate heat exchanger. In this embodiment, the expansion valve 34 is an electronic expansion valve. To achieve precise temperature control of the system by the refrigerant circuit 3, a temperature sensor 6 and a pressure sensor 7 can be connected in series on the refrigerant circuit 3. For example, a temperature sensor 6 and a pressure sensor 7 can be installed before the inlet of the compressor 31 to detect the inlet temperature and pressure of the compressor 31, and a temperature sensor 6 and a pressure sensor 7 can be installed after the outlet of the compressor 31 to detect the outlet temperature and pressure of the compressor 31.

[0063] In this embodiment, the first control valve 4 is a two-way valve, such as an electric two-way valve. The outlet of the first control valve 4 is connected to the inlet of the first channel of the heat exchanger 5.

[0064] The inlet of the first control valve 4 is connected between the outlet of the first circulating pump 13 and the inlet of the refrigerant channel; the outlet of the first channel of the heat exchanger 5 is connected between the outlet of the refrigerant channel of the evaporator 35 and the inlet of the first temperature control module 11; or,

[0065] The inlet of the first control valve 4 is connected between the outlet of the first circulating pump 13 and the inlet of the refrigerant passage of the evaporator 35. The outlet of the first passage of the heat exchanger 5 is connected between the outlet of the first circulating pump 13 and the inlet of the refrigerant passage of the evaporator 35. Furthermore, the connection point of the outlet of the first passage of the heat exchanger 5 on the first refrigerant circuit 1 is closer to the inlet of the refrigerant passage of the evaporator 35 than the connection point of the inlet of the first control valve 4 on the first refrigerant circuit 1; or...

[0066] The inlet of the first control valve 4 is connected between the outlet of the refrigerant channel of the evaporator 35 and the inlet of the first temperature control module 11, and the outlet of the first channel of the heat exchanger 5 is connected to the inlet of the first temperature control module 11.

[0067] For example, such as Figure 1 The diagram shows the first connection method. The outlet of the first control valve 4 is connected to the inlet of the first channel of the heat exchanger 5 via a pipeline. The inlet of the first control valve 4 is then connected via a pipeline between the outlet of the first circulating pump 13 and the inlet of the refrigerant channel of the evaporator 35. The outlet of the first channel of the heat exchanger 5 is connected via a pipeline between the outlet of the heater 14 and the inlet of the first temperature control module 11. In this case, if the first control valve 4 is open, the refrigerant flowing from the first temperature control module 11 passes through the first filter 12 and the first circulating pump 13, then through the evaporator 35 and the heat exchanger 5, before flowing back to the first temperature control module 11.

[0068] Or, use as Figure 2 The second connection method shown involves connecting the outlet of the first control valve 4 to the inlet of the first channel of the heat exchanger 5 via a pipeline, connecting the inlet of the first control valve 4 to the outlet of the first circulating pump 13 and the inlet of the refrigerant channel of the evaporator 35 via a pipeline, and connecting the outlet of the first channel of the heat exchanger 5 to the outlet of the first circulating pump 13 and the inlet of the refrigerant channel of the evaporator 35 via a pipeline. The connection point of the outlet of the first channel of the heat exchanger 5 on the first refrigerant circuit 1 is closer to the inlet of the refrigerant channel of the evaporator 35 than the connection point of the inlet of the first control valve 4 on the first refrigerant circuit 1. In this case, if the first control valve 4 is open, the refrigerant flowing out of the first temperature control module 11 passes through the first filter 12 and the first circulating pump 13. Part of it flows into the evaporator 35, and the other part enters the heat exchanger 5 via the first control valve 4, then passes through the evaporator 35 and the heater 14 (only when the heater 14 is present), before flowing back to the first temperature control module 11.

[0069] Or, use as Figure 3 The third connection method shown involves connecting the outlet of the first control valve 4 to the inlet of the first channel of the heat exchanger 5 via a pipeline, connecting the inlet of the first control valve 4 to the outlet of the heater 14 and the inlet of the first temperature control module 11 via a pipeline, and connecting the outlet of the first channel to the inlet of the first temperature control module 11. In this case, if the first control valve 4 is open, the refrigerant flowing out of the first temperature control module 11 passes through the first filter 12, the first circulating pump 13, the evaporator 35, and the heater 14 (only when the heater 14 is present). A portion of the refrigerant flows directly back to the first temperature control module 11, while the other portion flows back to the first temperature control module 11 after passing through the heat exchanger 5.

[0070] To ensure stable operation of the first refrigerant circuit 1 and the second refrigerant circuit 2, a liquid replenishment device (not shown) and an expansion tank 8 can be added to replenish the first refrigerant circuit 1 and the second refrigerant circuit 2 and maintain their pressure. The liquid replenishment device may include, for example, a liquid replenishment tank, a liquid replenishment pump, and a second control valve 9. The liquid replenishment device is connected to the first refrigerant circuit 1 via the first control valve 4 and a pipeline. For example, the connection point can be located between the outlet of the first temperature control module 11 and the inlet of the first filter 12. The bottom of the expansion tank 8 is connected to the first refrigerant circuit 1 and the second refrigerant circuit 2 via pipelines. The connection point with the first refrigerant circuit 1 can be located, for example, between the outlet of the first filter 12 and the inlet of the first circulation pump 13. The connection point with the second refrigerant circuit 2 can be located, for example, between the outlet of the second filter 22 and the inlet of the second circulation pump 23.

[0071] This application also provides a control method for a temperature control system, used in the aforementioned temperature control system.

[0072] The temperature control system includes the following control methods: a first cooling control step, a second cooling control step, a third cooling control step, and a fourth cooling control step. It may also include a self-circulation control step and a heating control step.

[0073] When the ambient temperature is greater than 45℃ but not greater than 55℃, i.e., when the ambient temperature is high, if the first equipment needs to cool down, the first cooling control step is executed. The first cooling control step includes: controlling the compressor 31 to start, controlling the first control valve 4 to allow the refrigerant flowing out of the first temperature control module 11 to pass through the evaporator 35 but not through the heat exchanger 5, i.e., controlling the first control valve 4 to close. At this time, both the first circulation pump 13 and the second circulation pump 23 are running at their highest speed.

[0074] At this time, when the first temperature control module 11 controls the temperature of the first device, the refrigerant in the first refrigerant circuit 1 exchanges heat with the first device at the first temperature control module 11, flows out of the first temperature control module 11, passes through the first filter 12 and enters the first circulation pump 13. After being pressurized by the first circulation pump 13, it enters the refrigerant channel of the evaporator 35, where it exchanges heat with the refrigerant in the refrigerant circuit 3. The refrigerant temperature decreases and the refrigerant temperature increases. The refrigerant then flows back to the first temperature control module 11 through the heater 14, completing one cycle. After the refrigerant in the refrigerant circuit 3 exchanges heat with the refrigerant in the first refrigerant circuit 1 in the refrigerant channel of the evaporator 35, it forms a high-temperature, low-pressure refrigerant gas. After being compressed by the compressor 31, it forms a high-temperature, high-pressure gas. At the condenser 32, it exchanges heat with the outside air and condenses into a medium-temperature, high-pressure refrigerant liquid. After being throttled and depressurized by the expansion valve 34, it forms a low-temperature, low-pressure two-phase refrigerant that enters the evaporator 35, completing one cycle. When the second temperature control module 21 controls the temperature of the second device, the refrigerant in the second refrigerant circuit 2 exchanges heat with the second device at the second temperature control module 21 and its temperature rises. After rising, it flows out of the second temperature control module 21, passes through the second filter 22 and enters the second circulation pump 23. After being pressurized by the second circulation pump 23, it enters the dry cooler 24. When the fan of the dry cooler 24 is turned on, the refrigerant exchanges heat with the outside air in the dry cooler 24 and its temperature drops. After flowing out of the dry cooler 24, the refrigerant passes through the second channel of the heat exchanger 5 (where no heat exchange occurs) and flows back to the second temperature control module 21, completing one cycle.

[0075] To achieve precise temperature control of the first and second devices, the first cooling control step may further include: collecting the inlet temperatures of the first temperature control module 11 and the second temperature control module 21 respectively, and adjusting the speed of the compressor 31 according to the inlet temperature of the first temperature control module 11 so that the inlet temperature of the first temperature control module 11 is within the range of the first preset temperature; and adjusting the fan speed of the dry cooler 24 according to the inlet temperature of the second temperature control module 21 so that the inlet temperature of the second temperature control module 21 is within the range of the second preset temperature.

[0076] At this time, due to the excessively high ambient temperature, the first control valve 4 is closed to prevent the refrigerant from flowing through the heat exchanger 5. This prevents the refrigerant in the first refrigerant circuit 1 from exchanging heat with the refrigerant in the second refrigerant circuit 2 at the heat exchanger 5, thus ensuring the temperature control accuracy of the first device and avoiding any impact on its heat dissipation. For the second device, cooling can only be achieved using the dry cooler 24. If the dry cooler 24's heat dissipation capacity is insufficient, leading to temperature runaway in the second device, the only control method is to reduce the load.

[0077] When the ambient temperature is greater than 35℃ but not greater than 45℃, if the first device requires cooling, a second cooling control step is executed. The second cooling control step includes: controlling the compressor 31 to start, and controlling the first control valve 4 so that the refrigerant flowing out of the first temperature control module 11 passes through both the evaporator 35 and the heat exchanger 5. At this time, both the first circulation pump 13 and the second circulation pump 23 are running at their highest speed.

[0078] At this time, as Figure 1 As shown, in the first connection method embodiment, when the first temperature control module 11 controls the temperature of the first device, the refrigerant in the first refrigerant circuit 1 exchanges heat with the first device at the first temperature control module 11, then flows out of the first temperature control module 11, passes through the first filter 12, and enters the first circulation pump 13. After being pressurized by the first circulation pump 13, a portion of the refrigerant enters the first channel of the heat exchanger 5 through the first control valve 4, and exchanges heat with the refrigerant in the second refrigerant circuit 2, causing the temperature of the refrigerant in the first refrigerant circuit 1 to rise; the other portion of the refrigerant enters the refrigerant channel of the evaporator 35, exchanges heat with the refrigerant in the refrigerant circuit 3 at the evaporator 35, and after the refrigerant temperature drops, it flows out after passing through the heater 14, and merges with the refrigerant flowing through the first channel, and together flows back to the first temperature control module 11, completing one cycle. The refrigerant circulation method in the refrigerant circuit 3 is the same as the circulation method in the first cooling control step, and will not be described again. When the second temperature control module 21 controls the temperature of the second device, the refrigerant in the second refrigerant circuit 2 exchanges heat with the second device at the second temperature control module 21, and its temperature rises. Then, it flows out of the second temperature control module 21, passes through the second filter 22, and enters the second circulation pump 23. After being pressurized by the second circulation pump 23, it enters the dry cooler 24. When the fan of the dry cooler 24 is turned on, the refrigerant exchanges heat with the outside air in the dry cooler 24, and its temperature drops. Then, it exchanges heat again with the refrigerant in the first refrigerant circuit 1 through the heat exchanger 5, which further lowers the temperature of the refrigerant in the second refrigerant circuit 2. After flowing out of the second channel of the heat exchanger 5, the refrigerant flows back to the second temperature control module 21, completing one cycle.

[0079] At this time, as Figure 2As shown, in the second connection method embodiment, when the first temperature control module 11 controls the temperature of the first device, the refrigerant in the first refrigerant circuit 1 exchanges heat with the first device at the first temperature control module 11, then flows out of the first temperature control module 11, passes through the first filter 12, and enters the first circulation pump 13. After being pressurized by the first circulation pump 13, a portion of the refrigerant enters the first channel of the heat exchanger 5 through the first control valve 4, exchanges heat with the refrigerant in the second refrigerant circuit 2, and then enters the refrigerant channel of the evaporator 35, increasing the temperature of the refrigerant in the first refrigerant circuit 1. The other portion of the refrigerant, together with the refrigerant flowing out of the heat exchanger 5, enters the refrigerant channel of the evaporator 35, exchanges heat with the refrigerant in the refrigerant circuit 3 at the evaporator 35, and after the refrigerant temperature decreases, it passes through the heater 14 and flows back to the first temperature control module 11, completing one cycle. The refrigerant circulation method in the refrigerant circuit 3 is the same as the circulation method in the first cooling control step, and will not be described again. When the second temperature control module 21 controls the temperature of the second device, the circulation mode of the refrigerant in the second refrigerant circuit 2 is the same as the circulation mode in the first connection mode in the second cooling control step, and will not be described again.

[0080] At this time, as Figure 3 As shown in the third connection embodiment, when the first temperature control module 11 controls the temperature of the first device, the refrigerant in the first refrigerant circuit 1 exchanges heat with the first device at the first temperature control module 11, then flows out of the first temperature control module 11, passes through the first filter 12, and enters the first circulation pump 13. After being pressurized by the first circulation pump 13, it enters the refrigerant channel of the evaporator 35, where it exchanges heat with the refrigerant in the refrigerant circuit 3. After the refrigerant temperature decreases, it passes through the heater 14. Part of the refrigerant flows directly back to the first temperature control module 11, while the other part passes through the first channel of the heat exchanger 5 and exchanges heat with the refrigerant in the second refrigerant circuit 2. The temperature of the refrigerant in the first refrigerant circuit 1 then increases, and it merges with the refrigerant flowing out of the heater 14 before flowing back to the first temperature control module 11, completing one cycle. The refrigerant circulation method in the refrigerant circuit 3 is the same as that in the first cooling control step, and will not be described again. When the second temperature control module 21 controls the temperature of the second device, the circulation mode of the refrigerant in the second refrigerant circuit 2 is the same as the circulation mode in the first connection mode in the second cooling control step, and will not be described again.

[0081] To achieve precise temperature control of the first and second devices, the first cooling control step may further include: separately collecting the inlet temperatures of the first temperature control module 11 and the second temperature control module 21, and adjusting the speed of the compressor 31, the opening degree of the first control valve 4, and the fan speed of the dry cooler 24 according to the inlet temperatures of the first temperature control module 11 and the second temperature control module 21, so that the inlet temperature of the first temperature control module 11 is within a first preset temperature range, and the inlet temperature of the second temperature control module 21 is within a second preset temperature range.

[0082] At this time, although the ambient temperature is high, the refrigerant circuit 3 can meet the cooling requirements of the first device. However, the heat dissipation capacity of the dry cooler 24 is limited and may not be able to meet the cooling requirements of the second device. By partially opening the first control valve 4, the refrigerant in the first refrigerant circuit 1 exchanges heat with the refrigerant in the second refrigerant circuit 2 at the heat exchanger 5. This allows the refrigerant in the second refrigerant circuit 2 to be cooled and the cooling capacity to be replenished while ensuring the temperature control accuracy of the first device, so as to ensure the normal operation of the second device.

[0083] When the ambient temperature is greater than 0℃ but not greater than 35℃, if the first device requires cooling, a third cooling control step is executed. The third cooling control step includes: controlling the compressor 31 to start, and controlling the first control valve 4 to allow the refrigerant flowing out of the first temperature control module 11 to pass through the evaporator 35 instead of the heat exchanger 5. At this time, both the first circulation pump 13 and the second circulation pump 23 are running at their highest speed.

[0084] At this point, the circulation patterns of the first refrigerant circuit 1, the second refrigerant circuit 2, and the refrigerant circuit 3 are all the same as those in the first cooling control step, and will not be repeated here.

[0085] At this time, since the ambient temperature is not high, the refrigerant circuit 3 and the dry cooler 24 can meet the cooling requirements of the first and second equipment respectively. Therefore, it is not necessary to open the first control valve 4, and the first refrigerant circuit 1 and the second refrigerant circuit 2 can operate independently.

[0086] When the ambient temperature is not lower than -30℃ and not higher than 0℃, if the first equipment requires cooling, the fourth cooling control step is executed. The fourth cooling control step includes: controlling the compressor 31 to shut down, and controlling the first control valve 4 so that the refrigerant flowing out of the first temperature control module 11 passes through both the evaporator 35 and the heat exchanger 5. At this time, both the first circulation pump 13 and the second circulation pump 23 are running at their highest speed.

[0087] At this time, the ambient temperature is low. In order to reduce energy consumption, the compressor 31 can be turned off and the first control valve 4 can be opened to the maximum flow rate. The dry cooler 24 can be used to cool the first and second devices respectively.

[0088] At this time, as Figure 1 As shown, in the first connection method embodiment, when the first temperature control module 11 controls the temperature of the first device, the refrigerant in the first refrigerant circuit 1 exchanges heat with the first device at the first temperature control module 11, flows out of the first temperature control module 11, passes through the first filter 12 and enters the first circulation pump 13. After being pressurized by the first circulation pump 13, a portion (most) of the refrigerant enters the first channel of the heat exchanger 5 through the first control valve 4 and exchanges heat with the refrigerant in the second refrigerant circuit 2, thus reducing the temperature of the refrigerant in the first refrigerant circuit 1. The other portion (small portion) of the refrigerant enters the refrigerant channel of the evaporator 35 but does not exchange heat. After merging with the refrigerant flowing through the first channel, they flow back to the first temperature control module 11 together, completing one cycle. When the second temperature control module 21 controls the temperature of the second device, the refrigerant in the second refrigerant circuit 2 exchanges heat with the second device at the second temperature control module 21 and its temperature rises. Then, it flows out of the second temperature control module 21, passes through the second filter 22 and enters the second circulation pump 23. After being pressurized by the second circulation pump 23, it enters the dry cooler 24. When the fan of the dry cooler 24 is turned on, the refrigerant exchanges heat with the outside air in the dry cooler 24 and its temperature drops. Then, it exchanges heat again with the refrigerant in the first refrigerant circuit 1 through the heat exchanger 5, and the temperature of the refrigerant in the second refrigerant circuit 2 rises. The refrigerant flows out of the second channel of the heat exchanger 5 and flows back to the second temperature control module 21, completing one cycle.

[0089] At this time, as Figure 2 As shown, in the second connection method embodiment, when the first temperature control module 11 controls the temperature of the first device, the refrigerant in the first refrigerant circuit 1 exchanges heat with the first device at the first temperature control module 11, flows out of the first temperature control module 11, passes through the first filter 12 and enters the first circulation pump 13. After being pressurized by the first circulation pump 13, a portion (most) of the refrigerant enters the first channel of the heat exchanger 5 through the first control valve 4, exchanges heat with the refrigerant in the second refrigerant circuit 2 and then enters the refrigerant channel of the evaporator 35, thus reducing the temperature of the refrigerant in the first refrigerant circuit 1. Another portion (small portion) of the refrigerant, together with the refrigerant flowing out of the heat exchanger 5, enters the refrigerant channel of the evaporator 35, but does not exchange heat. After passing through the heater 14, the refrigerant flows back to the first temperature control module 11, completing one cycle. When the second temperature control module 21 controls the temperature of the second device, the circulation mode of the refrigerant in the second refrigerant circuit 2 is the same as the circulation mode in the first connection mode in the fourth cooling control step, and will not be described again.

[0090] At this time, as Figure 3As shown in the third connection embodiment, when the first temperature control module 11 controls the temperature of the first device, the refrigerant in the first refrigerant circuit 1 exchanges heat with the first device at the first temperature control module 11, then flows out of the first temperature control module 11, passes through the first filter 12 and enters the first circulation pump 13. After being pressurized by the first circulation pump 13, it enters the refrigerant channel of the evaporator 35, but does not exchange heat. The refrigerant passes through the heater 14, and a portion (small part) of the refrigerant flows directly back to the first temperature control module 11, while the other portion (most part) of the refrigerant passes through the first channel of the heat exchanger 5 and exchanges heat with the refrigerant in the second refrigerant circuit 2. The temperature of the refrigerant in the first refrigerant circuit 1 decreases, and it merges with the refrigerant flowing out of the heater 14 and flows back to the first temperature control module 11, completing one cycle. When the second temperature control module 21 controls the temperature of the second device, the circulation method of the refrigerant in the second refrigerant circuit 2 is the same as that in the first connection embodiment in the fourth cooling control step, and will not be described again.

[0091] Under any ambient temperature conditions, if neither the first nor the second device requires temperature control, a self-circulation control step can be executed. This self-circulation control step includes: controlling the compressor 31 to shut down; controlling the first control valve 4 to allow the refrigerant flowing out of the first temperature control module 11 to pass through the evaporator 35 but not through the heat exchanger 5, i.e., controlling the first control valve 4 to close; and at this time, both the first circulation pump 13 and the second circulation pump 23 operate at their lowest speeds. At this time, the refrigerant in the first refrigerant circuit 1 flows out of the first temperature control module 11, passes through the first filter 12, enters the first circulation pump 13, is pressurized by the first circulation pump 13, and enters the refrigerant channel of the evaporator 35 without heat exchange. The refrigerant then flows back to the first temperature control module 11 through the heater 14, completing one cycle. After the refrigerant in the second refrigerant circuit 2 flows out of the second temperature control module 21, it passes through the second filter 22 and enters the second circulation pump 23. After being pressurized by the second circulation pump 23, it enters the dry cooler 24 without heat exchange. After the refrigerant flows out of the dry cooler 24, it passes through the second channel of the heat exchanger 5 (without heat exchange) and flows back to the second temperature control module 21, completing one cycle.

[0092] When the ambient temperature is not less than -30℃ and not greater than 0℃, if the first device has a heating requirement, the heating control step can be executed. The circulation mode of the refrigerant in the first refrigerant circuit 1 and the second refrigerant circuit 2 in the heating control step is the same as the circulation mode in the self-circulation control step. It is only necessary to turn on the heater 14 to heat the refrigerant in the first refrigerant circuit 1.

[0093] The temperature control system and control method of this application embodiment adopt a dual-loop design, enabling the dry cooler to meet the temperature control requirements of the second device under all operating conditions, while also meeting the heat dissipation requirements of the first device under low-temperature conditions (when the ambient temperature is not less than -30℃ and not greater than 0℃). This fully utilizes natural cold sources for heat dissipation, reducing energy consumption. The temperature control system replenishes and maintains the pressure of the first and second refrigerant loops by setting up an expansion tank and a liquid replenishment device. Simultaneously, two circulation pumps (the first circulation pump and the second circulation pump) provide power to the two independent first and second refrigerant loops, ensuring reliable operation of the circulation pumps. By setting up a first control valve and a heat exchanger, the temperature control system has multiple different circulation modes, ensuring that it can select the most suitable temperature control method according to changes in ambient temperature, maintaining optimal operating mode and ensuring precise temperature control of both the first and second devices. The temperature control system, by setting up an evaporator and a heat exchanger, can supplement the insufficient cooling capacity of the dry cooler on the second equipment side through the refrigerant circuit under higher temperature conditions (when the ambient temperature is greater than 35℃ but not greater than 45℃). At the same time, under low temperature conditions (when the ambient temperature is not less than -30℃ but not greater than 0℃), the refrigerant circuit can be shut off, and the cooling capacity of the dry cooler alone can meet the cooling needs of the first and second equipment, making full use of natural energy.

[0094] It should be noted that, in this document, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Unless otherwise specified, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes that element.

[0095] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A temperature control system, characterized in that, include: First refrigerant circuit, second refrigerant circuit, refrigerant circuit, first control valve and heat exchanger; The refrigerant circuit includes an evaporator, which includes a refrigerant passage and a refrigerant passage. The heat exchanger includes a first channel and a second channel; The first refrigerant circuit includes a first temperature control module connected to the refrigerant channel and a first circulation pump connected in series with the first temperature control module. The first refrigerant circuit is used to exchange heat with the first device through the first temperature control module in order to control the temperature of the first device. The second refrigerant circuit includes a second temperature control module and a dry cooler connected in series. The outlet of the dry cooler is connected to the inlet of the second channel, and the outlet of the second channel is connected to the inlet of the second temperature control module. The second refrigerant circuit is used to exchange heat with the second device through the second temperature control module to control the temperature of the second device. The first control valve is connected to the inlet of the first channel, and the outlet of the first channel is connected to the inlet of the first temperature control module; the first control valve is used to control the flow rate of the refrigerant in the first refrigerant circuit through the heat exchanger. The first control valve is a two-way valve, and the outlet of the first control valve is connected to the inlet of the first channel; The inlet of the first control valve is connected between the outlet of the first circulating pump and the inlet of the refrigerant channel, and the outlet of the first channel is connected between the outlet of the refrigerant channel and the inlet of the first temperature control module. or, The inlet of the first control valve is connected between the outlet of the first circulating pump and the inlet of the refrigerant channel, the outlet of the first channel is connected between the outlet of the first circulating pump and the inlet of the refrigerant channel, and the connection point of the outlet of the first channel on the first refrigerant circuit is closer to the inlet of the refrigerant channel than the connection point of the inlet of the first control valve on the first refrigerant circuit; or, The inlet of the first control valve is connected between the outlet of the refrigerant channel and the inlet of the first temperature control module, and the outlet of the first channel is connected to the inlet of the first temperature control module.

2. The temperature control system as described in claim 1, characterized in that, The first refrigerant circuit further includes a first filter connected in series between the first temperature control module and the first circulation pump; the inlet of the refrigerant channel is connected to the outlet of the first circulation pump, and the outlet of the refrigerant channel is connected to the inlet of the first temperature control module.

3. The temperature control system as described in claim 2, characterized in that, The first refrigerant circuit also includes a heater, which is connected in series between the outlet of the refrigerant channel and the inlet of the first temperature control module.

4. The temperature control system as described in claim 1, characterized in that, The second refrigerant circuit includes the second temperature control module, the second filter, the second circulation pump, and the dry cooler connected in series; the outlet of the dry cooler is connected to the inlet of the second channel.

5. The temperature control system as described in claim 1, characterized in that, The refrigerant circuit includes a compressor, a condenser, a third filter, an expansion valve, and the evaporator connected in series.

6. The temperature control system as described in claim 1, characterized in that, It also includes a liquid replenishment device and an expansion tank. The liquid replenishment device is connected to the first refrigerant circuit via a second control valve, and the bottom of the expansion tank is connected to the first refrigerant circuit and the second refrigerant circuit via pipelines.

7. A control method for a temperature control system, characterized in that, The temperature control system includes: a first refrigerant circuit, a second refrigerant circuit, a refrigerant circuit, a first control valve, and a heat exchanger; The refrigerant circuit includes a compressor and an evaporator connected in series, and the evaporator includes a refrigerant passage and a refrigerant passage. The heat exchanger includes a first channel and a second channel; The first refrigerant circuit includes a first temperature control module connected to the refrigerant channel. The first refrigerant circuit is used to exchange heat with the first device through the first temperature control module in order to control the temperature of the first device. The second refrigerant circuit includes a second temperature control module and a dry cooler connected in series. The outlet of the dry cooler is connected to the inlet of the second channel, and the outlet of the second channel is connected to the inlet of the second temperature control module. The second refrigerant circuit is used to exchange heat with the second device through the second temperature control module to control the temperature of the second device. The first control valve is connected to the inlet of the first channel, and the outlet of the first channel is connected to the inlet of the first temperature control module; the first control valve is used to control the flow rate of the refrigerant in the first refrigerant circuit through the heat exchanger. The control method of the temperature control system includes: First cooling control step: control the compressor to start, control the first control valve to make the refrigerant flowing out of the first temperature control module pass through the evaporator and not through the heat exchanger; The second cooling control step is to control the compressor to start and control the first control valve so that the refrigerant flowing out of the first temperature control module passes through both the evaporator and the heat exchanger. The third cooling control step: control the compressor to start, and control the first control valve to make the refrigerant flowing out of the first temperature control module pass through the evaporator instead of the heat exchanger; Fourth cooling control step: Control the compressor to shut down, and control the first control valve so that the refrigerant flowing out of the first temperature control module passes through both the evaporator and the heat exchanger.

8. The control method as described in claim 7, characterized in that, When the ambient temperature is greater than 45℃ but not greater than 55℃, if the first device has a cooling requirement, the first cooling control step shall be executed. When the ambient temperature is greater than 35℃ but not greater than 45℃, if the first device has a cooling requirement, the second cooling control step shall be executed. When the ambient temperature is greater than 0℃ and not greater than 35℃, if the first device has a cooling requirement, the third cooling control step shall be executed. When the ambient temperature is not less than -30℃ and not greater than 0℃, if the first device has a cooling requirement, the fourth cooling control step shall be executed.

9. The control method as described in claim 7 or 8, characterized in that, The first cooling control step further includes: collecting the inlet temperatures of the first temperature control module and the second temperature control module respectively, and adjusting the speed of the compressor according to the inlet temperature of the first temperature control module so that the inlet temperature of the first temperature control module is within a first preset temperature range; and adjusting the fan speed of the dry cooler according to the inlet temperature of the second temperature control module so that the inlet temperature of the second temperature control module is within a second preset temperature range. The second cooling control step further includes: collecting the inlet temperatures of the first temperature control module and the second temperature control module respectively, and adjusting the speed of the compressor, the opening degree of the first control valve and the fan speed of the dry cooler according to the inlet temperatures of the first temperature control module and the second temperature control module, so that the inlet temperature of the first temperature control module is within the first preset temperature range and the inlet temperature of the second temperature control module is within the second preset temperature range. The third cooling control step further includes: collecting the inlet temperatures of the first temperature control module and the second temperature control module respectively, and adjusting the speed of the compressor according to the inlet temperature of the first temperature control module so that the inlet temperature of the first temperature control module is within the first preset temperature range; adjusting the fan speed of the dry cooler according to the inlet temperature of the second temperature control module so that the inlet temperature of the second temperature control module is within the second preset temperature range. The fourth cooling control step further includes: collecting the inlet temperatures of the first temperature control module and the second temperature control module respectively, and adjusting the opening degree of the first control valve and the fan speed of the dry cooler according to the inlet temperatures of the first temperature control module and the second temperature control module, so that the inlet temperature of the first temperature control module is within the first preset temperature range and the inlet temperature of the second temperature control module is within the second preset temperature range.

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