Heat management system with condenser self-cleaning function and self-cleaning method thereof

Abstract

This invention discloses a thermal management system with condenser self-cleaning function and its self-cleaning method, relating to the technical field of thermal management systems and their control methods. It includes a refrigeration module and a liquid-cooled module. Switching the refrigerant circulation path of the refrigeration module to a second refrigerant circulation loop, and switching the liquid cooling medium circulation path of the liquid-cooled module to a second liquid cooling medium circulation loop, allows frost to form on the condenser surface. Switching the refrigerant circulation path of the refrigeration module to a first refrigerant circulation loop, and switching the liquid cooling medium circulation path of the liquid-cooled module to a first and second liquid cooling medium circulation loop connected in parallel, allows the frost on the condenser surface to melt. This invention primarily addresses the problem of providing a thermal management system with condenser self-cleaning function; it enables condenser self-cleaning to prevent and eliminate condenser blockage faults, thereby ensuring the normal operation of the thermal management system and energy storage system.

Description

Technical Field

[0001] This invention relates to the technical field of thermal management systems and their control methods, specifically to a thermal management system and its self-cleaning method with a condenser self-cleaning function. Background Technology

[0002] An energy storage system is a system used to store and release electrical energy. It involves the conversion between electrical energy and chemical energy, as well as the conversion between different types of electrical energy. In these processes, a lot of heat is generated. If the heat cannot be dissipated in time, the temperature of the energy storage system will rise, posing safety hazards and affecting the performance, lifespan, and normal operation of the energy storage system.

[0003] In order to control the temperature of the energy storage system and improve its charging and discharging efficiency, a thermal management system needs to be configured in the energy storage system to dissipate heat.

[0004] Among them, the heat dissipation system using phase change refrigeration technology is the most widely used thermal management system solution. The aforementioned heat dissipation system using phase change refrigeration technology typically includes a compressor, condenser, expansion valve, evaporator, and refrigerant pipes connecting the above components.

[0005] With the long-term operation of energy storage and thermal management systems, condensers that are in constant contact with air and undergo heat exchange are more likely to become clogged (e.g., dust, oil, etc.), which will obviously affect the heat exchange performance of the condenser, thereby affecting the overall efficiency of the thermal management system and causing performance degradation and shutdown of the thermal management and energy storage systems.

[0006] In existing thermal management systems, when condensers become clogged, manual cleaning is required, which obviously consumes a lot of labor costs, is inefficient, and has a high delay rate.

[0007] In conclusion, how to provide a thermal management system with condenser self-cleaning function and its self-cleaning method has become one of the urgent problems to be solved. Summary of the Invention

[0008] The purpose of this invention is to provide a thermal management system with condenser self-cleaning function and its self-cleaning method, which can realize the self-cleaning of the condenser to prevent and eliminate condenser blockage faults.

[0009] To achieve the above objectives, the present invention provides the following technical solution: a thermal management system with a condenser self-cleaning function, comprising a refrigeration module and a liquid cooling module; the refrigeration module includes a compressor, a condenser with forced convection by a fan, a first throttling device, a second throttling device, and an evaporative heat exchanger, wherein the refrigeration module can selectively constitute either a first refrigerant circulation loop or a second refrigerant circulation loop; the refrigerant circulation path of the first refrigerant circulation loop is sequentially: the compressor, the condenser, the first throttling device, the refrigerant channel of the evaporative heat exchanger, and the second throttling device; the refrigerant circulation path of the second refrigerant circulation loop is sequentially: the compressor, the refrigerant channel of the evaporative heat exchanger, the first throttling device, and the condenser; the liquid cooling module includes a main circulation pump, a liquid cooling heat exchanger, and a heat dissipation tank with forced convection by a fan, wherein the liquid cooling module constitutes a first liquid cooling medium circulation loop and a second liquid cooling medium circulation loop; The first liquid cooling medium circulation loop has the following liquid cooling medium circulation path: the main circulation pump, the liquid cooling medium channel of the evaporator heat exchanger, and the liquid cooling heat exchanger; the second liquid cooling medium circulation loop has the following liquid cooling medium circulation path: the main circulation pump, the liquid cooling medium channel of the evaporator heat exchanger, and the heat dissipation tank; and the first liquid cooling medium circulation loop and the second liquid cooling medium circulation loop can be selectively connected in parallel; when the refrigerant circulation path of the refrigeration module is switched to the second refrigerant circulation loop, and the liquid cooling medium circulation path of the liquid cooling module is switched to the second liquid cooling medium circulation loop, frost can form on the surface of the condenser; when the refrigerant circulation path of the refrigeration module is switched to the first refrigerant circulation loop, and the liquid cooling medium circulation path of the liquid cooling module is switched to the first liquid cooling medium circulation loop and the second liquid cooling medium circulation loop connected in parallel, the frost on the surface of the condenser can be melted.

[0010] In the above technical solution, the refrigeration module further includes a first refrigerant shut-off valve, a second refrigerant shut-off valve, and a third refrigerant shut-off valve; the first refrigerant shut-off valve is connected between the output end of the compressor and the condenser, the second refrigerant shut-off valve is connected between the output end of the compressor and the refrigerant passage of the evaporator heat exchanger, and the third refrigerant shut-off valve is connected between the input end of the compressor and the condenser; when the refrigeration module constitutes the first refrigerant circulation loop, the first refrigerant shut-off valve is open, and the second and third refrigerant shut-off valves are closed, and the refrigerant circulation path of the first refrigerant circulation loop is as follows: the compressor, the first refrigerant shut-off valve, the condenser, the first throttling device, the refrigerant passage of the evaporator heat exchanger, and the second throttling device; when the refrigeration module constitutes the second refrigerant circulation loop, the first refrigerant shut-off valve is closed, and the second and third refrigerant shut-off valves are open, and the refrigerant circulation path of the second refrigerant circulation loop is as follows: the compressor, the third refrigerant shut-off valve, the refrigerant passage of the evaporator heat exchanger, the first throttling device, the condenser, and the second refrigerant shut-off valve.

[0011] In the above technical solution, the liquid cooling module further includes a liquid cooling medium shut-off valve; the liquid cooling medium shut-off valve is connected at the connection node between the first liquid cooling medium circulation loop and the second liquid cooling medium circulation loop, and is used to open or close the connection node between the first liquid cooling medium circulation loop and the second liquid cooling medium circulation loop.

[0012] In the above technical solution, the liquid cooling module further includes a liquid cooling medium proportional valve; the liquid cooling medium proportional valve is connected to any node of the second liquid cooling medium circulation loop and is used to adjust the liquid cooling medium flow rate of the second liquid cooling medium circulation loop.

[0013] In the above technical solution, the liquid cooling module further includes a heater; the heater is connected before the input end of the liquid cooling heat exchanger and is used to heat the liquid cooling medium.

[0014] In the above technical solution, the liquid cooling module further includes an outlet temperature sensor T1 and an inlet temperature sensor T2; the outlet temperature sensor T1 is connected to the output end of the heat sink and is used to detect the outlet temperature of the heat sink; the inlet temperature sensor T2 is connected to the input end of the heat sink and is used to detect the inlet temperature of the heat sink.

[0015] In the above technical solution, the refrigeration module further includes a condenser inlet pressure sensor P1, a compressor inlet pressure sensor P2, and a compressor inlet temperature sensor T3; the condenser inlet pressure sensor P1 is connected to the input end of the condenser and is used to detect the refrigerant pressure at the input end of the condenser; the compressor inlet pressure sensor P2 is connected to the input end of the compressor and is used to detect the refrigerant input pressure of the compressor; the compressor inlet temperature sensor T3 is connected to the input end of the compressor and is used to detect the refrigerant input temperature of the compressor.

[0016] A condenser self-cleaning method for a thermal management system, applied to the aforementioned thermal management system with condenser self-cleaning function, the method comprising:

[0017] S1. After the thermal management system is put into operation, a preset time is started. After the preset time is reached, or after the thermal management system experiences a condenser blockage fault, proceed to step S2.

[0018] S2. Detect the ambient temperature and ambient humidity. If both the ambient temperature and ambient humidity meet the preset frosting judgment threshold, proceed to step S3. If either the ambient temperature or ambient humidity does not meet the preset frosting judgment threshold, wait for one sampling time period and then proceed to step S2 again.

[0019] S3. Put both the refrigeration module and the liquid cooling module into the shutdown state;

[0020] S4. Switch the refrigerant circulation path of the refrigeration module to the second refrigerant circulation loop, switch the liquid cooling medium circulation path of the liquid cooling module to the second liquid cooling medium circulation loop, adjust the liquid cooling medium flow rate of the second liquid cooling medium circulation loop to the maximum, start the compressor of the refrigeration module, start the main circulation pump of the liquid cooling module, and start the fan to provide forced convection for the condenser of the refrigeration module and / or the evaporator heat exchanger of the liquid cooling module;

[0021] S5. Gradually increase the speed of the compressor until it reaches full speed, so that frost forms on the surface of the condenser;

[0022] S6. Put the refrigeration module and the liquid cooling module back into the shutdown state;

[0023] S7. Switch the refrigerant circulation path of the refrigeration module to the first refrigerant circulation loop, switch the liquid cooling medium circulation path of the liquid cooling module to the first liquid cooling medium circulation loop and the second liquid cooling medium circulation loop connected in parallel, adjust the liquid cooling medium flow rate of the second liquid cooling medium circulation loop to the maximum, start the compressor of the refrigeration module, start the main circulation pump of the liquid cooling module, and start the fan to provide forced convection for the condenser of the refrigeration module and / or the evaporator heat exchanger of the liquid cooling module;

[0024] S8. Gradually increase the speed of the compressor until it reaches full speed, and put both the fan and the main circulation pump of the liquid cooling module at full speed to melt the frost on the surface of the condenser.

[0025] S9. Put the refrigeration module and the liquid cooling module back into the shutdown state;

[0026] S10. Restore the normal operation of the refrigeration module and the liquid cooling module, and determine whether the blockage of the condenser has been cleared. If the blockage of the condenser has been cleared, maintain the normal operation of the refrigeration module and the liquid cooling module, and re-enter step S1; if the blockage of the condenser has not been cleared, re-enter step S2.

[0027] In the above technical solution, after step S5, the following steps are also included:

[0028] When the following conditions are met simultaneously, the condenser is determined to have sufficient frost on its surface, and the process proceeds to step S6:

[0029] a. The pressure value fed back by the condenser inlet pressure sensor P1 is lower than a preset first threshold.

[0030] b. The temperature difference between the inlet temperature fed by the inlet temperature sensor T2 and the outlet temperature of the outlet temperature sensor T1 is lower than a preset second threshold.

[0031] c. The opening degree of the first throttling device is higher than the preset third threshold.

[0032] In the above technical solution, step S10, determining whether the condenser has been cleared of dirt or blockage, specifically involves the following method:

[0033] The condenser is considered to have been cleared of blockage when the following conditions are met simultaneously:

[0034] a. The pressure value fed back by the condenser inlet pressure sensor P1 is within the preset fourth threshold value compared with the historical operating data / initial preset data.

[0035] b. The pressure value fed back by the compressor inlet pressure sensor P2 is within the preset fifth threshold value compared with the historical operating data / initial preset data.

[0036] c. The temperature value fed back by the compressor inlet temperature sensor T3, compared with the historical operating data / initial preset data, has a difference within the preset sixth threshold.

[0037] Compared with the prior art, the beneficial effects of the present invention are as follows: The thermal management system and its self-cleaning method with condenser self-cleaning function of the present invention, when switching the refrigerant circulation path of the refrigeration module to the second refrigerant circulation loop and the liquid cooling medium circulation path of the liquid cooling module to the second liquid cooling medium circulation loop, can cause frost to form on the condenser surface; when switching the refrigerant circulation path of the refrigeration module to the first refrigerant circulation loop and the liquid cooling medium circulation path of the liquid cooling module to the first and second liquid cooling medium circulation loops connected in parallel, can melt the frost on the condenser surface; when frost forms on the condenser surface, Frost can fill the gaps between the condenser fins and rub against contaminants such as dust and oil, thereby reducing the adhesion of contaminants. When the frost on the condenser surface melts, it can carry the contaminants away from the condenser, thus achieving self-cleaning of the condenser. This invention can achieve self-cleaning of the condenser to prevent and eliminate condenser blockage faults, save labor costs, and reduce the delay rate when troubleshooting condenser blockage faults, thereby ensuring the normal operation of the thermal management system and energy storage system. Moreover, this self-cleaning method can be implemented directly by the components of the thermal management system itself, without the need to add components to the thermal management system, thus reducing the cost and complexity of the thermal management system. Attached Figure Description

[0038] Figure 1 This is a system structure view of the present invention.

[0039] Figure 2 This is a flowchart of the steps of the present invention.

[0040] Figure 3 This is a schematic diagram of the cyclic flow direction in steps S4 and S5 of the present invention.

[0041] Figure 4 This is a schematic diagram of the cyclic flow direction in steps S7 and S8 of the present invention.

[0042] The attached diagram is labeled as follows: 1. Compressor; 2. Condenser; 3. Fan; 4. First throttling device; 5. Second throttling device; 6. Evaporator heat exchanger; 7. First refrigerant shut-off valve; 8. Second refrigerant shut-off valve; 9. Third refrigerant shut-off valve; P1. Condenser inlet pressure sensor; P2. Compressor inlet pressure sensor; T3. Compressor inlet temperature sensor; 10. Main circulation pump; 11. Liquid-cooled heat exchanger; 12. Liquid-cooled medium shut-off valve; 13. Radiator tank; 14. Liquid-cooled medium proportional valve; 15. Heater; T1. Outlet liquid temperature sensor; T2. Inlet liquid temperature sensor; 100. Functional device. Detailed Implementation

[0043] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0044] This embodiment provides a thermal management system with a condenser self-cleaning function, which can provide heat dissipation and heat preservation functions for various functional devices. As a typical example, in this embodiment, a battery pack in an energy storage system is used as the functional device 100 to specifically illustrate the technical solution of the present invention.

[0045] Please see Figure 1 The thermal management system with condenser self-cleaning function in this embodiment includes a refrigeration module and a liquid cooling module.

[0046] The refrigeration module includes a compressor 1, a condenser 2 with forced convection by a fan 3, a first throttling device 4, a second throttling device 5, and an evaporative heat exchanger 6.

[0047] In this system, compressor 1 is a compressor used to compress refrigerant in the refrigeration system, specifically a variable frequency compressor; condenser 2 is a condenser in the refrigeration system, i.e., a self-cleaning object in this embodiment, which dissipates heat through its own attached fan 3, which is a precision electronic fan capable of controlling and providing feedback on its speed; the first throttling device 4 and the second throttling device 5 are both throttling devices in the refrigeration system. In this embodiment, both the first throttling device 4 and the second throttling device 5 are electronic expansion valves, which can be opened / closed and have their opening degree adjusted by a host computer; the evaporative heat exchanger 6 is used for heat exchange between the refrigeration module and the liquid cooling module. In most cases, the evaporative heat exchanger 6 is a plate heat exchanger, which has a refrigerant channel and a liquid cooling medium channel.

[0048] The refrigeration module can selectively form either the first refrigerant circulation loop or the second refrigerant circulation loop.

[0049] The refrigerant circulation path of the first refrigerant circulation loop is as follows: compressor 1, condenser 2, first throttling device 4, refrigerant passage of evaporator heat exchanger 6, and second throttling device 5.

[0050] The refrigerant circulation path of the second refrigerant circulation loop is as follows: compressor 1, refrigerant passage of evaporator heat exchanger 6, first throttling device 4, and condenser 2.

[0051] The liquid cooling module includes a main circulation pump 10, a liquid cooling heat exchanger 11, and a heat dissipation tank 13 with forced convection by a fan 3.

[0052] The main circulation pump 10 is a liquid pump capable of driving the flow of liquid cooling medium, such as an electronic water pump; the liquid cooling heat exchanger 11 is a metal plate with good thermal conductivity and internal flow channels, which is suitable for being attached to / built into the heating element. In this embodiment, the liquid cooling heat exchanger 11 exchanges heat with the functional device 100 (i.e., the battery pack in the energy storage system); the heat dissipation tank 13 is a metal radiator with multiple liquid flow channels, and each liquid flow channel is provided with heat dissipation fins. It can dissipate heat for the liquid cooling medium flowing through it through forced convection or natural convection. In this embodiment, the condenser 2 of the refrigeration module and the heat dissipation tank 13 of the liquid cooling module share a set of fans 3 (e.g., 2-3 fans 3 arranged in parallel); in other embodiments, the condenser 2 of the refrigeration module and the heat dissipation tank 13 of the liquid cooling module can also be equipped with an independent set of fans.

[0053] The liquid cooling module constitutes the first liquid cooling medium circulation loop and the second liquid cooling medium circulation loop.

[0054] The liquid cooling medium circulation path of the first liquid cooling medium circulation loop is as follows: main circulation pump 10, liquid cooling medium channel of evaporator heat exchanger 6 and liquid cooling heat exchanger 11.

[0055] The liquid cooling medium circulation path of the second liquid cooling medium circulation loop is as follows: main circulation pump 10, liquid cooling medium channel of evaporator heat exchanger 6 and heat dissipation water tank 13.

[0056] Furthermore, the first liquid cooling medium circulation loop and the second liquid cooling medium circulation loop can be selectively connected to each other in parallel.

[0057] When the refrigerant circulation path of the refrigeration module is switched to the second refrigerant circulation loop, and the liquid cooling medium circulation path of the liquid cooling module is switched to the second liquid cooling medium circulation loop, frost can be formed on the surface of the condenser 2.

[0058] Switching the refrigerant circulation path of the refrigeration module to the first refrigerant circulation loop, and switching the liquid cooling medium circulation path of the liquid cooling module to the first liquid cooling medium circulation loop and the second liquid cooling medium circulation loop connected in parallel, can melt the frost on the surface of the condenser 2.

[0059] Specifically, the refrigeration module also includes a first refrigerant shut-off valve 7, a second refrigerant shut-off valve 8, and a third refrigerant shut-off valve 9. The first refrigerant shut-off valve 7, the second refrigerant shut-off valve 8, and the third refrigerant shut-off valve 9 are all dedicated refrigerant shut-off valves in the refrigeration system and can be opened / closed by a host computer. The first refrigerant shut-off valve 7 is connected between the output end of the compressor 1 (specifically, the output end based on the refrigerant forward circulation) and the condenser 2. The second refrigerant shut-off valve 8 is connected between the output end of the compressor 1 (specifically, the output end based on the refrigerant forward circulation) and the refrigerant passage of the evaporator heat exchanger 6. The third refrigerant shut-off valve 9 is connected between the input end of the compressor 1 (specifically, the input end based on the refrigerant forward circulation) and the condenser 2.

[0060] When the refrigeration module forms the first refrigerant circulation loop, the first refrigerant shut-off valve 7 is open, and the second refrigerant shut-off valve 8 and the third refrigerant shut-off valve 9 are closed. The refrigerant circulation path of the first refrigerant circulation loop is as follows: compressor 1, first refrigerant shut-off valve 7, condenser 2, first throttling device 4, refrigerant passage of evaporator heat exchanger 6, and second throttling device 5.

[0061] When the refrigeration module forms the second refrigerant circulation loop, the first refrigerant shut-off valve 7 is closed, and the second refrigerant shut-off valve 8 and the third refrigerant shut-off valve 9 are open. The refrigerant circulation path of the second refrigerant circulation loop is as follows: compressor 1, second refrigerant shut-off valve 8, refrigerant passage of evaporator heat exchanger 6, first throttling device 4, condenser 2 and third refrigerant shut-off valve 9.

[0062] Specifically, the liquid cooling module also includes a liquid cooling medium shut-off valve 12, wherein the liquid cooling medium shut-off valve 12 is a liquid shut-off valve, such as an electronic water valve, which can be opened / closed by a host computer; the liquid cooling medium shut-off valve 12 is connected at the connection node between the first liquid cooling medium circulation loop and the second liquid cooling medium circulation loop, and is used to open or close the connection node between the first liquid cooling medium circulation loop and the second liquid cooling medium circulation loop; in this embodiment, one end of the liquid cooling medium shut-off valve 12 is connected to the liquid cooling medium input end of the liquid cooling heat exchanger 11 (located in the first liquid cooling medium circulation loop), and the other end is connected to the second liquid cooling medium circulation loop.

[0063] Furthermore, the liquid cooling module also includes a liquid cooling medium proportional valve 14, wherein the liquid cooling medium proportional valve 14 is a liquid proportional valve, such as an electronic proportional valve, which can be controlled by a host computer to open / close and adjust the opening ratio; the liquid cooling medium proportional valve 14 is connected at any node of the second liquid cooling medium circulation loop and is used to adjust the liquid cooling medium flow rate of the second liquid cooling medium circulation loop; in this embodiment, the liquid cooling medium proportional valve 14 is connected to the front side of the input end of the heat dissipation tank 13.

[0064] Furthermore, the liquid cooling module also includes a heater 15, wherein the heater 15 is an electric liquid heater 15, used to prevent the temperature of the liquid cooling medium from being too low, and it can be turned on / off and the heating power can be adjusted by the host computer; the heater 15 is connected before the input end of the liquid cooling heat exchanger 11 for heating the liquid cooling medium.

[0065] Furthermore, the liquid cooling module also includes an outlet temperature sensor T1 and an inlet temperature sensor T2. Both the outlet temperature sensor T1 and the inlet temperature sensor T2 are dedicated water temperature sensors for liquid cooling units and can report the temperature of the liquid cooling medium to the host computer. The outlet temperature sensor T1 is connected to the output terminal of the heat sink 13 and is used to detect the outlet temperature of the heat sink 13. The inlet temperature sensor T2 is connected to the input terminal of the heat sink 13 and is used to detect the inlet temperature of the heat sink 13.

[0066] Furthermore, the refrigeration module also includes a condenser inlet pressure sensor P1, a compressor inlet pressure sensor P2, and a compressor inlet temperature sensor T3. Both the condenser inlet pressure sensor P1 and the compressor inlet pressure sensor P2 are refrigerant-specific pressure sensors in the refrigeration system, capable of reporting refrigerant pressure to the host computer. The compressor inlet temperature sensor T3 is a refrigerant-specific temperature sensor in the refrigeration system, capable of reporting refrigerant temperature to the host computer. The condenser inlet pressure sensor P1 is connected to the input end of the condenser 2 and is used to detect the refrigerant pressure at the input end of the condenser 2 (specifically, the input end based on the forward refrigerant circulation; in the reverse refrigerant circulation, this input end should be considered the output end). The compressor inlet pressure sensor P2 is connected to the input end of the compressor 1 and is used to detect the refrigerant input pressure of the compressor 1. The compressor inlet temperature sensor T3 is connected to the input end of the compressor 1 and is used to detect the refrigerant input temperature of the compressor 1.

[0067] The system is equipped with outlet temperature sensor T1 and inlet temperature sensor T2, which can respectively report the outlet and inlet temperatures of the cooling water tank 13 to the host computer. A condenser inlet pressure sensor P1 is also installed, which can report the refrigerant pressure at the input end of the condenser 2 (specifically, the input end based on the forward refrigerant circulation; in reverse refrigerant circulation, this input end should be considered the output end) to the host computer. A compressor inlet pressure sensor P2 and a compressor inlet temperature sensor T3 are also installed, which can respectively report the refrigerant input pressure and refrigerant input temperature of the compressor 1 to the host computer. In this way, closed-loop control of the thermal management system is achieved.

[0068] It is understood that the thermal management system with condenser self-cleaning function in this embodiment is equipped with a host computer (such as an industrial control computer, programmable controller, thermal management system dedicated controller, and embedded system, etc.); the actuators of the first throttling device 4, the second throttling device 5, the first refrigerant shut-off valve 7, the second refrigerant shut-off valve 8, the third refrigerant shut-off valve 9, the fan 3, the liquid cooling medium shut-off valve 12, and the liquid cooling medium proportional valve 14 are all connected to the host computer through a general input / output interface or a communication interface to control the operation of the above components; the condenser inlet pressure sensor P1, the compressor inlet pressure sensor P2, the compressor inlet temperature sensor T3, the liquid outlet temperature sensor T1, and the liquid inlet temperature sensor T2 are connected to the host computer through a general input / output interface, an analog interface, or a communication interface.

[0069] Please see Figure 2 This embodiment also provides a condenser self-cleaning method for a thermal management system, applied to the aforementioned thermal management system with condenser self-cleaning function, the method comprising:

[0070] S1. After the thermal management system is put into operation, a preset time is started. After the preset time is reached, or after the thermal management system experiences a condenser blockage fault, proceed to step S2.

[0071] In this step, timing can be achieved through the built-in timer program of the host computer. The preset time can be manually set based on experience (i.e., experience of the time period during which condenser 2 is more likely to become clogged). When the thermal management system experiences a condenser 2 clog fault, it can be detected by manual inspection. In automatic judgment, the pressure value fed back by the condenser inlet pressure sensor P1, the pressure value fed back by the compressor inlet pressure sensor P2, and the temperature value fed back by the compressor inlet temperature sensor T3 can be compared with historical operating data / initial preset data. If the difference exceeds a certain threshold (this threshold is also manually set based on experience), it is determined that a condenser 2 clog fault has occurred.

[0072] S2. Detect the ambient temperature and humidity. If both the ambient temperature and humidity meet the preset frosting threshold, proceed to step S3. If either the ambient temperature or the ambient humidity does not meet the preset frosting threshold, wait for one sampling time period before proceeding to step S2 again.

[0073] In this step, the detection of ambient temperature and humidity can be achieved by temperature and humidity sensors installed near the energy storage system, adjacent to the thermal management system, or in the computer room / chassis. Both temperature and humidity sensors are connected to the host computer via analog output interfaces or communication interfaces, thereby enabling the detection and transmission of ambient temperature and humidity.

[0074] In this step, the frosting threshold is set manually based on experience. Specifically, a series of ambient temperatures and humidity levels that allow the refrigeration system to successfully frost are summarized, and these are compiled into a table / curve and embedded in the host computer. The host computer then determines whether the preset frosting threshold is met based on the current ambient temperature and humidity (e.g., whether the ambient temperature and humidity fall within the range of the aforementioned table, or whether the ambient temperature and humidity fit the aforementioned curve). If the ambient temperature / humidity does not meet the preset frosting threshold, it is necessary to continue waiting (i.e., waiting for a sampling time period, such as 8 hours, 12 hours, or 24 hours) until a suitable ambient temperature and humidity for frosting is obtained.

[0075] S3. Set both the refrigeration module and the liquid cooling module to the off state.

[0076] In this step, specifically, the first throttling device 4, the second throttling device 5, the first refrigerant shut-off valve 7, the second refrigerant shut-off valve 8, and the third refrigerant shut-off valve 9 of the refrigeration module are all in the shut-off state. The compressor 1 of the refrigeration module gradually reduces its speed until it stops. The liquid cooling medium shut-off valve 12 and the liquid cooling medium proportional valve 14 of the liquid cooling module are both in the shut-off state. The main circulation pump 10 of the liquid cooling module gradually reduces its speed until it stops. The fan 3 of the condenser 2 and the heat dissipation tank 13 is turned off.

[0077] (like Figure 3 (As shown) S4. Switch the refrigerant circulation path of the refrigeration module to the second refrigerant circulation loop, switch the liquid cooling medium circulation path of the liquid cooling module to the second liquid cooling medium circulation loop, adjust the liquid cooling medium flow rate of the second liquid cooling medium circulation loop to the maximum, start the compressor 1 of the refrigeration module, start the main circulation pump 10 of the liquid cooling module, and start the fan 3 to provide forced convection for the condenser 2 of the refrigeration module and / or the evaporator heat exchanger 6 of the liquid cooling module.

[0078] In this step, the refrigerant circulation path of the refrigeration module is switched to the second refrigerant circulation loop. Specifically, the first refrigerant shut-off valve 7 is closed, and the second refrigerant shut-off valve 8 and the third refrigerant shut-off valve 9 are opened, so that the refrigerant circulation path is as follows: compressor 1, third refrigerant shut-off valve 9, refrigerant passage of evaporator heat exchanger 6, first throttling device 4, condenser 2, and second refrigerant shut-off valve 8. The liquid cooling medium circulation path of the liquid cooling module is switched to the second liquid cooling medium circulation loop. Specifically, the liquid cooling medium shut-off valve 12 is closed to cut off the connection node between the first liquid cooling medium circulation loop and the second liquid cooling medium circulation loop, so that the first liquid cooling medium circulation loop is cut off from the liquid cooling medium circulation path in a bypass manner. At this time, the liquid cooling medium circulation path is as follows: main circulation pump 10, liquid cooling medium passage of evaporator heat exchanger 6, heater 15, liquid cooling medium proportional valve 14, and heat dissipation tank 13. The liquid cooling medium flow rate of the second liquid cooling medium circulation loop is adjusted to the maximum. Specifically, the opening degree of liquid cooling medium proportional valve 14 of the liquid cooling module is adjusted to the maximum.

[0079] S5. Gradually increase the speed of compressor 1 until it reaches full speed, so that frost forms on the surface of condenser 2.

[0080] In this step, the speed of the fan 3 can be controlled by comprehensively considering the pressure value fed back by the condenser inlet pressure sensor P1 (at this time, for condenser 2, it is a refrigerant reverse circulation process, so the pressure value fed back by the condenser inlet pressure sensor P1 is actually the refrigerant output pressure of condenser 2), the outlet liquid temperature sensor T1 and the inlet liquid temperature sensor T2, and the outlet liquid temperature and inlet liquid temperature of the heat dissipation tank 13.

[0081] Since steps S4 and S5 are refrigerant reverse circulation processes, the condenser 2 will frost over, but at the same time the evaporator heat exchanger 6 will generate a large amount of heat. Therefore, the first liquid cooling medium circulation loop needs to operate to dissipate heat from the evaporator heat exchanger 6 through the heat dissipation tank 13. In addition, the first liquid cooling medium circulation loop is cut off from the liquid cooling medium circulation path in a bypass manner, so the liquid cooling heat exchanger 11 of the functional device 100 does not participate in the liquid cooling medium circulation and will not heat the functional device 100.

[0082] S6. Put the refrigeration module and liquid cooling module back into the shutdown state.

[0083] In this step, specifically, the first throttling device 4, the second throttling device 5, the first refrigerant shut-off valve 7, the second refrigerant shut-off valve 8, and the third refrigerant shut-off valve 9 of the refrigeration module are all in the shut-off state. The compressor 1 of the refrigeration module gradually reduces its speed until it stops. The liquid cooling medium shut-off valve 12 and the liquid cooling medium proportional valve 14 of the liquid cooling module are both in the shut-off state. The main circulation pump 10 of the liquid cooling module gradually reduces its speed until it stops. The fan 3 of the condenser 2 and the heat dissipation tank 13 is turned off.

[0084] (like Figure 4 (As shown) S7, switch the refrigerant circulation path of the refrigeration module to the first refrigerant circulation loop, switch the liquid cooling medium circulation path of the liquid cooling module to the first liquid cooling medium circulation loop and the second liquid cooling medium circulation loop connected in parallel, adjust the liquid cooling medium flow rate of the second liquid cooling medium circulation loop to the maximum, start the compressor 1 of the refrigeration module, start the main circulation pump 10 of the liquid cooling module, and start the fan 3 to provide forced convection for the condenser 2 of the refrigeration module and / or the evaporator heat exchanger 6 of the liquid cooling module.

[0085] In this step, the refrigerant circulation path of the refrigeration module is switched to the first refrigerant circulation loop. Specifically, the first refrigerant shut-off valve 7 is opened, and the second refrigerant shut-off valve 8 and the third refrigerant shut-off valve 9 are closed, making the refrigerant circulation path sequentially: compressor 1, first refrigerant shut-off valve 7, condenser 2, first throttling device 4, refrigerant passage of evaporator heat exchanger 6, and second throttling device 5. The liquid cooling medium circulation path of the liquid cooling module is switched to the first liquid cooling medium circulation loop and the second liquid cooling medium circulation loop connected in parallel. Specifically, the liquid cooling medium shut-off valve 12 is opened to open the first liquid cooling medium circulation loop and the second liquid cooling medium circulation loop. The connection nodes between the cold medium circulation loops allow the first liquid cooling medium circulation loop to be bypassed and connected to the liquid cooling medium circulation loop. At this time, the liquid cooling medium circulation path is: a) main circulation pump 10, liquid cooling medium channel of evaporator heat exchanger 6, heater 15, liquid cooling medium proportional valve 14 and heat dissipation tank 13; b) main circulation pump 10, liquid cooling medium channel of evaporator heat exchanger 6, heater 15, liquid cooling medium shut-off valve 12 and liquid cooling heat exchanger 11; the liquid cooling medium flow rate of the second liquid cooling medium circulation loop is adjusted to the maximum, specifically by adjusting the opening of the liquid cooling medium proportional valve 14 of the liquid cooling module to the maximum.

[0086] S8. Gradually increase the speed of compressor 1 until it reaches full speed, and put both fan 3 and main circulation pump 10 of liquid cooling module at full speed to melt the frost on the surface of condenser 2.

[0087] S9. Put the refrigeration module and liquid cooling module back into the shutdown state.

[0088] In this step, specifically, the first throttling device 4, the second throttling device 5, the first refrigerant shut-off valve 7, the second refrigerant shut-off valve 8, and the third refrigerant shut-off valve 9 of the refrigeration module are all in the shut-off state. The compressor 1 of the refrigeration module gradually reduces its speed until it stops. The liquid cooling medium shut-off valve 12 and the liquid cooling medium proportional valve 14 of the liquid cooling module are both in the shut-off state. The main circulation pump 10 of the liquid cooling module gradually reduces its speed until it stops. The fan 3 of the condenser 2 and the heat dissipation tank 13 is turned off.

[0089] S10. Restore the normal operation of the refrigeration module and the liquid cooling module, and determine whether the blockage of the condenser 2 has been cleared. If the blockage of the condenser 2 has been cleared, maintain the normal operation of the refrigeration module and the liquid cooling module, and re-enter step S1; if the blockage of the condenser 2 has not been cleared, re-enter step S2.

[0090] Furthermore, after step S5, the following steps are also included:

[0091] When the following conditions are met simultaneously, the condenser 2 is determined to have sufficient frost on its surface, and the process proceeds to step S6:

[0092] a. The pressure value fed back by the condenser inlet pressure sensor P1 is lower than the preset first threshold.

[0093] b. The temperature difference between the inlet temperature fed by the inlet temperature sensor T2 and the outlet temperature of the outlet temperature sensor T1 is lower than the preset second threshold.

[0094] c. The opening degree of the first throttling device 4 is higher than the preset third threshold.

[0095] Since steps S4 and S5 are refrigerant reverse circulation processes, the refrigerant evaporates in the condenser 2. The condenser 2, whose surface is fully frosted, has a low temperature, and the refrigerant is difficult to fully evaporate in the condenser 2. Therefore, the pressure value fed back by the condenser inlet pressure sensor P1 (i.e., the refrigerant output pressure of the condenser 2) will decrease. Whether the pressure value fed back by the condenser inlet pressure sensor P1 is lower than the preset first threshold (this first threshold is set manually through experience) can be used as one of the judgment conditions for whether the surface of the condenser 2 is fully frosted.

[0096] The condenser 2, whose surface is fully frosted, has a low temperature (and is difficult to cool down further). As a result, the evaporator heat exchanger 6 is also difficult to heat up further. That is, the heat output of the evaporator heat exchanger 6 will be reduced. Therefore, the heat dissipation pressure of the heat sink 13 will be relieved. Whether the temperature difference between the inlet temperature fed by the inlet temperature sensor T2 and the outlet temperature of the outlet temperature sensor T1 is lower than the preset second threshold (this second threshold is set manually through experience) can be used as one of the judgment conditions for whether the surface of the condenser 2 is fully frosted.

[0097] The condenser 2, whose surface is fully frosted, has a low temperature, making it difficult for the refrigerant to evaporate fully in the condenser 2. Therefore, the refrigerant is kept in a high-pressure state, which makes the opening of the first throttling device 4 higher. Therefore, whether the opening of the first throttling device 4 is higher than the preset third threshold (which is set manually through experience) can be used as one of the judgment conditions for whether the surface of the condenser 2 is fully frosted.

[0098] This step provides a reasonable criterion for determining whether the surface of condenser 2 has been sufficiently frosted, thereby achieving feedback control and enabling condenser 2 to complete self-cleaning more fully.

[0099] Further, in step S10, it is determined whether the blockage in condenser 2 has been cleared. The specific method is as follows:

[0100] The blockage in condenser 2 is considered to have been cleared when the following conditions are met simultaneously:

[0101] a. The pressure value fed back by the condenser inlet pressure sensor P1 is within the preset fourth threshold range compared with the historical operating data / initial preset data.

[0102] b. The pressure value fed back by the compressor inlet pressure sensor P2 is within the preset fifth threshold range compared with the historical operating data / initial preset data.

[0103] c. The temperature value fed back by the compressor inlet temperature sensor T3, compared with the historical operating data / initial preset data, has a difference within the preset sixth threshold.

[0104] When condenser 2 is clean, the thermal management system is obviously operating better. At this time, the pressure value fed back by condenser inlet pressure sensor P1, the pressure value fed back by compressor inlet pressure sensor P2, and the temperature value fed back by compressor inlet temperature sensor T3 are recorded as historical operating data. Alternatively, the manufacturer can obtain initial preset data based on experience and embed the historical operating data / initial preset data into the host computer. The fourth, fifth, and sixth thresholds mentioned above are all set manually based on experience.

[0105] After executing step S9, if the pressure values ​​fed back by the condenser inlet pressure sensor P1, the pressure values ​​fed back by the compressor inlet pressure sensor P2, and the temperature values ​​fed back by the compressor inlet temperature sensor T3 are within the fourth threshold, the fifth threshold, and the sixth threshold, respectively, compared with the historical operating data / initial preset data, then it is considered that the operating status of the thermal management system has been restored to good, and the dirt blockage of the condenser 2 is judged to have been eliminated.

[0106] This step provides a reasonable criterion for determining whether the dirt blockage in condenser 2 has been cleared, thereby achieving feedback control and enabling condenser 2 to complete self-cleaning more fully.

[0107] When frost forms on the surface of condenser 2, the frost can fill the gaps between the fins of condenser 2 and rub against contaminants such as dust and oil, thereby reducing the adhesion of contaminants; when the frost on the surface of condenser 2 melts, it can carry the contaminants away from condenser 2, thereby achieving self-cleaning of condenser 2.

[0108] The thermal management system and its self-cleaning method with condenser self-cleaning function in this embodiment, when switching the refrigerant circulation path of the refrigeration module to the second refrigerant circulation loop and the liquid cooling medium circulation path of the liquid cooling module to the second liquid cooling medium circulation loop, can cause frost to form on the surface of the condenser 2; when switching the refrigerant circulation path of the refrigeration module to the first refrigerant circulation loop and the liquid cooling medium circulation path of the liquid cooling module to the first and second liquid cooling medium circulation loops connected in parallel, can melt the frost on the surface of the condenser 2; when frost forms on the surface of the condenser 2, the frost can fill the fins of the condenser 2. The frost on the condenser 2 surface rubs against dust, oil, and other contaminants, reducing the adhesion of these contaminants. When the frost melts, it carries the contaminants away from the condenser 2, thus achieving self-cleaning of the condenser 2. This embodiment enables the self-cleaning of the condenser 2 to prevent and eliminate condenser 2 blockage, saving labor costs and reducing the delay rate when troubleshooting condenser 2 blockage. This ensures the normal operation of the thermal management system and energy storage system. Furthermore, this self-cleaning method can be implemented directly using the components of the thermal management system itself, without the need to add components to the thermal management system, thus reducing the cost and complexity of the thermal management system.

[0109] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A thermal management system with condenser self-cleaning function, characterized in that, Including refrigeration modules and liquid cooling modules; The refrigeration module includes a compressor, a condenser with forced convection by a fan, a first throttling device, a second throttling device, and an evaporative heat exchanger. The refrigeration module can selectively form either a first refrigerant circulation loop or a second refrigerant circulation loop. The refrigerant circulation path of the first refrigerant circulation loop is as follows: the compressor, the condenser, the first throttling device, the refrigerant passage of the evaporator heat exchanger, and the second throttling device; The refrigerant circulation path of the second refrigerant circulation loop is as follows: the compressor, the refrigerant passage of the evaporator heat exchanger, the first throttling device, and the condenser; The liquid cooling module includes a main circulation pump, a liquid cooling heat exchanger, and a heat dissipation water tank with forced convection by a fan. The liquid cooling module constitutes a first liquid cooling medium circulation loop and a second liquid cooling medium circulation loop. The liquid cooling medium circulation path of the first liquid cooling medium circulation loop is as follows: the main circulation pump, the liquid cooling medium channel of the evaporator heat exchanger, and the liquid cooling heat exchanger; The liquid cooling medium circulation path of the second liquid cooling medium circulation loop is as follows: the main circulation pump, the liquid cooling medium channel of the evaporative heat exchanger, and the heat dissipation water tank; Furthermore, the first liquid cooling medium circulation loop and the second liquid cooling medium circulation loop can be selectively connected to each other in parallel. When the refrigerant circulation path of the refrigeration module is switched to the second refrigerant circulation loop, and the liquid cooling medium circulation path of the liquid cooling module is switched to the second liquid cooling medium circulation loop, frost can be formed on the surface of the condenser. Switching the refrigerant circulation path of the refrigeration module to the first refrigerant circulation loop, and switching the liquid cooling medium circulation path of the liquid cooling module to the first liquid cooling medium circulation loop and the second liquid cooling medium circulation loop connected in parallel, can melt the frost on the surface of the condenser.

2. The thermal management system with condenser self-cleaning function according to claim 1, characterized in that, The refrigeration module also includes a first refrigerant shut-off valve, a second refrigerant shut-off valve, and a third refrigerant shut-off valve. The first refrigerant shut-off valve is connected between the output end of the compressor and the condenser; the second refrigerant shut-off valve is connected between the output end of the compressor and the refrigerant passage of the evaporator heat exchanger; and the third refrigerant shut-off valve is connected between the input end of the compressor and the condenser. When the refrigeration module forms the first refrigerant circulation loop, the first refrigerant shut-off valve is open, and the second and third refrigerant shut-off valves are closed. The refrigerant circulation path of the first refrigerant circulation loop is as follows: the compressor, the first refrigerant shut-off valve, the condenser, the first throttling device, the refrigerant passage of the evaporator heat exchanger, and the second throttling device. When the refrigeration module forms the second refrigerant circulation loop, the first refrigerant shut-off valve is closed, and the second and third refrigerant shut-off valves are open. The refrigerant circulation path of the second refrigerant circulation loop is as follows: the compressor, the third refrigerant shut-off valve, the refrigerant passage of the evaporator heat exchanger, the first throttling device, the condenser, and the second refrigerant shut-off valve.

3. The thermal management system with condenser self-cleaning function according to claim 1 or 2, characterized in that, The liquid cooling module also includes a liquid cooling medium shut-off valve; The liquid cooling medium shut-off valve is connected at the connection node between the first liquid cooling medium circulation loop and the second liquid cooling medium circulation loop, and is used to open or close the connection node between the first liquid cooling medium circulation loop and the second liquid cooling medium circulation loop.

4. The thermal management system with condenser self-cleaning function according to claim 3, characterized in that, The liquid cooling module also includes a liquid cooling medium proportional valve; The liquid cooling medium proportional valve is connected to any node of the second liquid cooling medium circulation loop and is used to adjust the flow rate of the liquid cooling medium in the second liquid cooling medium circulation loop.

5. The thermal management system with condenser self-cleaning function according to claim 3, characterized in that, The liquid cooling module also includes a heater; The heater is connected before the input end of the liquid-cooled heat exchanger and is used to heat the liquid-cooled medium.

6. The thermal management system with condenser self-cleaning function according to claim 1 or 2, characterized in that, The liquid cooling module also includes an outlet temperature sensor T1 and an inlet temperature sensor T2; The outlet temperature sensor T1 is connected to the output terminal of the heat dissipation tank and is used to detect the outlet temperature of the heat dissipation tank. The inlet temperature sensor T2 is connected to the input terminal of the heat exchange tank and is used to detect the inlet temperature of the heat exchange tank.

7. The thermal management system with condenser self-cleaning function according to claim 1 or 2, characterized in that, The refrigeration module also includes a condenser inlet pressure sensor P1, a compressor inlet pressure sensor P2, and a compressor inlet temperature sensor T3. The condenser inlet pressure sensor P1 is connected to the input end of the condenser and is used to detect the refrigerant pressure at the input end of the condenser. The compressor inlet pressure sensor P2 is connected to the input end of the compressor and is used to detect the refrigerant input pressure of the compressor. The compressor inlet temperature sensor T3 is connected to the input end of the compressor and is used to detect the refrigerant input temperature of the compressor.

8. A condenser self-cleaning method for a thermal management system, applied to the thermal management system with condenser self-cleaning function as described in any one of claims 1-7, characterized in that, The method includes: S1. After the thermal management system is put into operation, a preset time is started. After the preset time is reached, or after the thermal management system experiences a condenser blockage fault, proceed to step S2. S2. Detect the ambient temperature and ambient humidity. If both the ambient temperature and ambient humidity meet the preset frosting judgment threshold, proceed to step S3. If either the ambient temperature or ambient humidity does not meet the preset frosting judgment threshold, wait for one sampling time period and then proceed to step S2 again. S3. Put both the refrigeration module and the liquid cooling module into the shutdown state; S4. Switch the refrigerant circulation path of the refrigeration module to the second refrigerant circulation loop, switch the liquid cooling medium circulation path of the liquid cooling module to the second liquid cooling medium circulation loop, adjust the liquid cooling medium flow rate of the second liquid cooling medium circulation loop to the maximum, start the compressor of the refrigeration module, start the main circulation pump of the liquid cooling module, and start the fan to provide forced convection for the condenser of the refrigeration module and / or the evaporator heat exchanger of the liquid cooling module; S5. Gradually increase the speed of the compressor until it reaches full speed, so that frost forms on the surface of the condenser; S6. Put the refrigeration module and the liquid cooling module back into the shutdown state; S7. Switch the refrigerant circulation path of the refrigeration module to the first refrigerant circulation loop, switch the liquid cooling medium circulation path of the liquid cooling module to the first liquid cooling medium circulation loop and the second liquid cooling medium circulation loop connected in parallel, adjust the liquid cooling medium flow rate of the second liquid cooling medium circulation loop to the maximum, start the compressor of the refrigeration module, start the main circulation pump of the liquid cooling module, and start the fan to provide forced convection for the condenser of the refrigeration module and / or the evaporator heat exchanger of the liquid cooling module; S8. Gradually increase the speed of the compressor until it reaches full speed, and put both the fan and the main circulation pump of the liquid cooling module at full speed to melt the frost on the surface of the condenser. S9. Put the refrigeration module and the liquid cooling module back into the shutdown state; S10. Restore the normal operation of the refrigeration module and the liquid cooling module, and determine whether the blockage of the condenser has been cleared. If the blockage of the condenser has been cleared, maintain the normal operation of the refrigeration module and the liquid cooling module, and re-enter step S1; if the blockage of the condenser has not been cleared, re-enter step S2.

9. The condenser self-cleaning method of the thermal management system according to claim 8, characterized in that, The liquid cooling module also includes an outlet temperature sensor T1 and an inlet temperature sensor T2; the outlet temperature sensor T1 is connected to the output end of the heat sink and is used to detect the outlet temperature of the heat sink; the inlet temperature sensor T2 is connected to the input end of the heat sink and is used to detect the inlet temperature of the heat sink. The refrigeration module also includes a condenser inlet pressure sensor P1, a compressor inlet pressure sensor P2, and a compressor inlet temperature sensor T3; the condenser inlet pressure sensor P1 is connected to the input end of the condenser and is used to detect the refrigerant pressure at the input end of the condenser; the compressor inlet pressure sensor P2 is connected to the input end of the compressor and is used to detect the refrigerant input pressure of the compressor. The compressor inlet temperature sensor T3 is connected to the input end of the compressor and is used to detect the refrigerant input temperature of the compressor. After step S5, the following also includes: When the following conditions are met simultaneously, the condenser is determined to have sufficient frost on its surface, and the process proceeds to step S6: a. The pressure value fed back by the condenser inlet pressure sensor P1 is lower than a preset first threshold. b. The temperature difference between the inlet temperature fed by the inlet temperature sensor T2 and the outlet temperature of the outlet temperature sensor T1 is lower than a preset second threshold. c. The opening degree of the first throttling device is higher than the preset third threshold.

10. The condenser self-cleaning method of the thermal management system according to claim 9, characterized in that, In step S10, it is determined whether the condenser has been cleared of dirt or blockage. The specific method is as follows: The condenser is considered to have been cleared of blockage when the following conditions are met simultaneously: a. The pressure value fed back by the condenser inlet pressure sensor P1 is within the preset fourth threshold value compared with the historical operating data / initial preset data. b. The pressure value fed back by the compressor inlet pressure sensor P2 is within the preset fifth threshold value compared with the historical operating data / initial preset data. c. The temperature value fed back by the compressor inlet temperature sensor T3, compared with the historical operating data / initial preset data, has a difference within the preset sixth threshold.

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