Efficient energy-saving method for coordinating air conditioning system through battery refrigeration based on heat recovery

Abstract

The invention discloses an efficient energy-saving method for coordinating an air conditioning system through battery refrigeration based on heat recovery, and relates to the technical field of refrigeration systems. A refrigerant circulation branch of the evaporation plate heat exchanger for battery refrigeration is connected to a refrigerant circulation branch of the air conditioner refrigeration system in parallel. The air conditioner refrigerating system comprises a compressor, a supercooling type condenser, a first expansion valve assembly, an air conditioner evaporator assembly and a gas-liquid separator. A refrigerant circulation branch of the evaporation plate heat exchanger comprises the evaporation plate heat exchanger and a second expansion valve assembly. The proportion of refrigerants flowing into the first expansion valve assembly and the second expansion valve assembly is balanced by monitoring the refrigeration condition required by the air conditioner evaporator assembly and the temperature monitored by the temperature detection sensor. The refrigerant circulation branch of the evaporation plate heat exchanger is connected to the air conditioner refrigeration system in parallel to consume excessive refrigerant in the air conditioner refrigeration system so as to improve the energy utilization rate, and the problem of air conditioner refrigeration energy waste is solved.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of refrigeration systems, and particularly relates to an efficient energy-saving method for coordinating an air conditioning system based on battery refrigeration through heat recovery. BACKGROUND

[0002] With the development of pure electric drive technology for vehicles, more and more engineering machinery is also developing into electric drive. The battery carrying the driving power source needs to be cooled to release electricity, and a refrigeration unit is needed to control the temperature. At the same time, the operator needs a comfortable operating environment, and an electrically driven air conditioning unit is needed. The two modules are originally independent systems. With the demand for technological progress and cost reduction, the battery refrigeration unit temperature control system and the indoor air conditioning system are gradually developing into a two-in-one system. The two-in-one system is an air conditioning evaporator assembly (including an expansion valve) and an evaporative heat exchanger (including an expansion valve) associated with heat exchange. The battery refrigeration unit temperature control system and the indoor air conditioning system are combined into the compressor suction circuit, and there is no associated connection in between.

[0003] Due to the actual use process, there are two main working mode characteristics: battery cooling on and air conditioning off, and both modules on. However, the two modules have different operating powers, and the power of the two modules changes quickly, which cannot be effectively adjusted. When the battery is under high load output, the heat release is fast and concentrated, and the cooling demand is large. Due to the limited power flow selection provided by the compressor, the battery cooling is not timely, which leads to failure to stop. The power flow is preferentially supplied to the battery cooling, which is called the "flow competition" phenomenon, causing the indoor air conditioning refrigeration demand flow to be insufficient or even to stop. In high-temperature weather, the indoor temperature will rise rapidly, causing poor comfort or failure, which cannot effectively operate and work, resulting in large economic losses. At the same time, the power flow is supplied to the battery evaporative heat exchanger, and then converted to the air conditioning evaporator. Because the refrigerant flow in the battery evaporative heat exchanger is short, the return gas temperature is generally low and changes between -2-+10℃, and the return gas superheat degree is relatively low. This part of latent heat energy is not fully utilized. SUMMARY

[0004] The purpose of the present application is to provide an efficient energy-saving method for coordinating an air conditioning system based on battery refrigeration through heat recovery. By parallel connecting a battery refrigeration evaporative heat exchanger refrigerant circulation branch on the refrigerant circulation branch of the air conditioning refrigeration system, the excess refrigerant in the air conditioning refrigeration system is consumed to improve the energy utilization rate, solving the problem of energy waste caused by the excess refrigerant flowing into the air conditioning evaporator assembly.

[0005] To solve the above technical problems, the present application is realized by the following technical scheme: The present application is an efficient energy-saving method for coordinating an air conditioning system based on battery refrigeration through heat recovery, and the specific method is as follows: S1: a battery refrigeration evaporative heat exchanger refrigerant circulation branch is connected in parallel on the refrigerant circulation branch of the air conditioning refrigeration system; S2: the air conditioning refrigeration system comprises a compressor, a supercooling condenser, a first expansion valve assembly, an air conditioning evaporator assembly and a gas-liquid separator, refrigerant enters the air conditioning evaporator assembly and absorbs heat, the refrigerant flows into the gas-liquid separator to separate the gas and discharge into the compressor to be compressed into high-temperature and high-pressure gas, and the gas flows into the supercooling condenser, the supercooling condenser connects the refrigerant liquid to the refrigerant input end of the air conditioning evaporator assembly through the first expansion valve assembly, and a mixer is arranged on the pipeline of the first expansion valve assembly; The evaporative heat exchanger refrigerant circulation branch comprises an evaporative heat exchanger and a second expansion valve assembly, a three-way joint one is arranged on the pipeline between the supercooling condenser and the first expansion valve assembly, the branch pipe of the three-way joint one is connected to the liquid inlet end of the second expansion valve assembly, the liquid inlet release port of the second expansion valve assembly is connected to the inlet of the evaporative heat exchanger, the gas outlet end of the evaporative heat exchanger is connected to the gas outlet end of the second expansion valve assembly in parallel through a pipeline, a three-way joint two is arranged on the pipeline of the gas outlet end of the evaporative heat exchanger, the branch pipe of the three-way joint two is connected to the mixer, a second power-off normally closed electromagnetic cut-off valve is arranged on the pipeline connected to the mixer, and a third power-off normally closed electromagnetic cut-off valve is arranged on the pipeline between the three-way joint two and the output end of the air conditioning evaporator assembly; The first expansion valve assembly and the second expansion valve assembly are thermal expansion valves, which can automatically adjust the refrigerant flow according to the temperature of the refrigerant flowing out of the evaporative heat exchanger, and a first power-off normally closed electromagnetic cut-off valve is arranged on the input end pipeline of the first thermal expansion valve; S3: a temperature controller is arranged in the air conditioning evaporator assembly, and a temperature detection sensor is arranged on the evaporative core body, the refrigeration circuit of the air conditioning evaporator assembly is controlled by monitoring the refrigeration condition required by the air conditioning evaporator assembly and the temperature monitored by the temperature detection sensor, the opening and closing of the first power-off normally closed electromagnetic cut-off valve, the second power-off normally closed electromagnetic cut-off valve and the third power-off normally closed electromagnetic cut-off valve are associated, when the temperature monitored by the temperature detection sensor is higher than the set temperature, the first power-off normally closed electromagnetic cut-off valve and the second power-off normally closed electromagnetic cut-off valve are started to open the flow, and the third power-off normally closed electromagnetic cut-off valve is closed to cut off the flow, when the temperature monitored by the temperature detection sensor is higher than the set temperature, the first power-off normally closed electromagnetic cut-off valve and the second power-off normally closed electromagnetic cut-off valve are started to be closed, and the third power-off normally closed electromagnetic cut-off valve is opened to pass through the flow.

[0006] The first expansion valve assembly and the first power-off normally closed electromagnetic cut-off valve are combined into an integrated assembly unit, and at least one of the first expansion valve assembly and the second expansion valve assembly is an electronic expansion valve; If the first expansion valve assembly and the first normally closed electromagnetic cut-off valve are combined into an integrated assembly, the mixer is arranged on a pipeline between a refrigerant output end of the first electronic expansion valve and an input port of the air conditioner evaporator assembly.

[0007] The application further provides that a view liquid pressure switch is arranged on a pipeline between the subcooled condenser and the tee joint.

[0008] The application further provides that a heat preservation layer is wrapped around the pipeline of the air conditioner refrigeration system, the pipeline of the refrigerant circulation branch of the evaporative panel and the outside of the mixer.

[0009] The application further provides that the mixer comprises a tank body and an L-shaped outlet conduit, the tank body is provided with a first liquid inlet pipe, a second liquid inlet pipe and a mixed liquid outlet pipe on a sidewall near a top position, and one end of the L-shaped outlet conduit is inserted into the mixed liquid outlet pipe and the other end extends to a bottom position in the tank body.

[0010] The application further provides that the compressor is a variable frequency compressor, and the power of the variable frequency compressor needs to be adjusted according to the sum of the refrigerant flow required by the air conditioner evaporator assembly and the refrigerant flow required by the evaporative panel.

[0011] The application further provides that a temperature controller is arranged on the air conditioner evaporator assembly, the temperature controller is provided with a sensor for detecting indoor temperature, when the indoor temperature reaches a set value, the temperature controller is started to close the first normally closed electromagnetic cut-off valve and the second normally closed electromagnetic cut-off valve and open the third normally closed electromagnetic cut-off valve, when the indoor temperature is higher than the set temperature value, the temperature controller is started to open the first normally closed electromagnetic cut-off valve and the second normally closed electromagnetic cut-off valve and close the third normally closed electromagnetic cut-off valve, so as to realize the circulation of refrigerant.

[0012] The application has the following beneficial effects: In high-temperature weather and high-load battery heating, the battery evaporative panel (including the expansion valve) has low return gas superheat (close to the temperature of the expansion valve leading into the evaporator of the conventional evaporator assembly), and part of the unevaporated refrigerant flows into the air conditioner evaporator assembly again for evaporation, thereby playing the latent heat refrigeration, and according to the return gas superheat flowing through the expansion valve of the evaporator assembly, part of the released refrigerant is supplemented into the air conditioner evaporator for optimization adjustment, thereby reducing the refrigerant flow input to the air conditioner evaporator assembly, improving the overall refrigeration capacity of the evaporator assembly, avoiding the poor comfort or failure caused by the reduction of indoor air conditioner power or even shutdown, and avoiding the large economic loss caused by the inability to effectively operate and stop working.

[0013] Of course, any product implementing this invention does not necessarily need to achieve all of the advantages described above at the same time. Attached Figure Description

[0014] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0015] Figure 1 A schematic diagram illustrating the principle of a highly efficient energy-saving method for coordinating air conditioning systems using battery refrigeration based on heat recovery; Figure 2 The following diagram illustrates a method for coordinating high-efficiency energy-saving air conditioning systems using battery refrigeration based on heat recovery, in which the first expansion valve assembly and the first normally closed electromagnetic shut-off valve are combined as a single unit. Figure 3 for Figure 1 Schematic diagram after the second expansion valve assembly is replaced with the second electronic expansion valve; Figure 4 for Figure 1 Schematic diagram after the second expansion valve assembly and the second expansion valve assembly are replaced with the first electronic expansion valve and the second electronic expansion valve, respectively. Figure 5 This is a schematic diagram of the mixer.

[0016] The attached diagram lists the components represented by each number as follows: 1. Compressor; 2. Subcooled condenser; 3. Sight pressure switch (or sight pressure sensor); 4. Second expansion valve assembly; 5. Evaporator plate heat exchanger; 6. T-connector one; 7. First normally closed solenoid shut-off valve; 8. T-connector two; 9. Second normally closed solenoid shut-off valve; 10. Mixer; 10-1. First inlet pipe; 10-2. Second inlet pipe; 10-3. Mixed outlet pipe; 10-4. Insulation layer; 10-5. Tank body; 10-6. L-shaped outlet conduit; 11. Air conditioning evaporator assembly; 12. Third normally closed solenoid shut-off valve; 13. First expansion valve assembly; 14. T-connector three; 15. Gas-liquid separator; 16. Integrated unit; 17. Second electronic expansion valve; 18. First electronic expansion valve. Detailed Implementation

[0017] With reference to the drawings of the embodiments of the present application, the technical solutions in the embodiments of the present application will be clearly and completely described. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments of the present application, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the scope of the present application.

[0018] Please refer to Figures 1-5 The present application is a high-efficiency energy-saving method for coordinating air conditioning systems based on heat recovery battery refrigeration. The specific method is as follows: S1: A refrigerant circulation branch of an evaporative panel 5 for battery refrigeration is connected in parallel on the refrigerant circulation branch of an air conditioning refrigeration system; S2: The air conditioning refrigeration system comprises a compressor 1, an overcooling condenser 2, a first expansion valve assembly 13, an air conditioning evaporator assembly 11, and a gas-liquid separator 15. The refrigerant enters the air conditioning evaporator assembly 11 and then flows into the gas-liquid separator 15 to absorb heat, and then flows into the compressor 1 to be compressed into a high-temperature and high-pressure gas, and then flows into the overcooling condenser 2. The overcooling condenser 2 connects the refrigerant liquid to the refrigerant input end of the air conditioning evaporator assembly 11 through the first expansion valve assembly 13. A mixer 10 is arranged on the pipeline of the first expansion valve assembly 13; The refrigerant circulation branch of the evaporative panel 5 comprises the evaporative panel 5 and a second expansion valve assembly 4. A three-way joint 1 6 is arranged on the pipeline between the overcooling condenser 2 and the first expansion valve assembly 13. The branch pipe of the three-way joint 1 6 is connected to the liquid inlet end of the second expansion valve assembly 4. The second expansion valve assembly 4 is connected to the evaporative panel 5. The gas outlet end of the evaporative panel 5 is connected in parallel to the gas outlet end of the second expansion valve assembly 4 through a pipeline. A three-way joint 2 8 is arranged on the pipeline of the gas outlet end of the evaporative panel 5. The branch pipe of the three-way joint 2 8 is connected to the mixer 10, and a second power-off normally closed electromagnetic cut-off valve 9 is arranged on the pipeline connected to the mixer 10. A third power-off normally closed electromagnetic cut-off valve 1 2 is arranged on the pipeline between the three-way joint 2 8 and the output end of the air conditioning evaporator assembly 1 1; At least one of the first expansion valve assembly 1 3 and the second expansion valve assembly 4 is provided with an electric control device for intelligently controlling the flow rate of the refrigerant; S3: The air conditioner evaporator assembly 11 is provided with a temperature controller and an evaporative core body provided with a temperature detection sensor, which controls the opening and closing of the first power-off normally closed electromagnetic cut-off valve 7, the second power-off normally closed electromagnetic cut-off valve 9 and the third power-off normally closed electromagnetic cut-off valve 12 associated with the refrigeration circuit of the air conditioner evaporator assembly 11 by monitoring the refrigeration conditions required by the air conditioner evaporator assembly 11 and the temperature monitored by the temperature detection sensor. When the temperature detected by the temperature detection sensor is higher than the set temperature, the first power-off normally closed electromagnetic cut-off valve 7 and the second power-off normally closed electromagnetic cut-off valve 9 are opened to pass through the flow, and the third power-off normally closed electromagnetic cut-off valve 12 is closed to cut off. When the temperature detected by the temperature detection sensor is lower than the set temperature, the first power-off normally closed electromagnetic cut-off valve 7 and the second power-off normally closed electromagnetic cut-off valve 9 are closed, and the third power-off normally closed electromagnetic cut-off valve 12 is opened to pass through the flow.

[0019] In a normal indoor air conditioning refrigeration system, the liquid refrigerant compressed by the compressor is generally more, even if the frequency conversion compressor is used, the repeated frequency conversion of the compressor will cause the liquid refrigerant to be not optimally utilized. The battery in the room will generate a lot of heat during use, and an additional refrigeration system (evaporative plate exchange) is needed to utilize the battery evaporative plate exchange (including expansion valve) to make the return gas superheat degree low (close to the temperature of the conventional evaporator assembly expansion valve leading into the air conditioner evaporator assembly 11, lower than 2℃, part of the liquid refrigerant will not evaporate into gas, and the liquid refrigerant will not play a better heat absorption effect), at this time, the low return gas superheat degree of the refrigerant in the evaporative plate exchange will flow into the air conditioner evaporator assembly 11 to continue evaporation and play its latent heat refrigeration, and according to the return gas superheat degree of the evaporative plate assembly 11 expansion valve, part of the released refrigerant is supplemented into the air conditioner evaporator assembly 11 to optimize the adjustment and achieve the best utilization of the refrigerant refrigeration effect. Since the refrigerant cannot achieve the best utilization of the refrigerant in one cycle (air conditioning refrigeration system), a parallel evaporative plate exchange 5 is established to coordinate the utilization of the refrigerant, so that the refrigerant can be better utilized.

[0020] A three-way joint one 6 is provided on the pipeline between the cold condenser 2 and the first expansion valve assembly 13, which is needed to divide the flow before the liquid refrigerant coming out of the cold condenser 2 enters the air conditioner evaporator assembly 11, so as to effectively control the flow direction of the refrigerant. The first expansion valve assembly 13 and the second expansion valve assembly 4 can control the flow and speed of the refrigerant to adjust the amount entering the air conditioner evaporator assembly 11 and the amount entering the evaporative plate exchange 5 to coordinate, which can better control the amount of liquid refrigerant flowing into different positions to achieve optimal heat absorption, so that the battery can be better cooled, and the air conditioning refrigeration requirement can be guaranteed.

[0021] At least one of the first expansion valve assembly 13 and the second expansion valve assembly 4 is an electronic expansion valve; If the first expansion valve assembly 13 is a first electronic expansion valve 18, the mixer 10 is arranged on the pipeline between the refrigerant output end of the first electronic expansion valve 18 and the air conditioner evaporator assembly 11, and if the first expansion valve assembly 13 is a first thermal expansion valve, a first power-off normally closed electromagnetic cut-off valve 7 is arranged on the input end pipeline of the first thermal expansion valve. If the second expansion valve assembly 4 is a second electronic expansion valve 17, the third power-off normally closed electromagnetic cut-off valve 12 on the output end of the three-way joint two 8 can be cancelled.

[0022] The electronic expansion valve is driven by a stepping motor, can be linked with a frequency converter and a PLC, and is suitable for a variable frequency system; the valve core precision reaches a micron level, supports wide-range flow regulation, can accurately control the proportion of the liquid refrigerant flowing to the air conditioner evaporator assembly 11 and the evaporative panel 5, and can adjust the flow to both when the liquid refrigerant compressed by the compressor fluctuates in a small range, so that the refrigerant is optimally utilized. In addition, the electronic expansion valve can also be remotely closed to realize refrigeration of one of the air conditioner evaporator assembly 11 and the evaporative panel 5.

[0023] A sight liquid pressure switch 3 is arranged on the pipeline between the subcooling condenser 2 and the three-way joint one 6.

[0024] The sight liquid pressure switch 3 is an integrated component with refrigerant state observation and pressure protection control in the refrigeration system, the core function of which is to monitor the refrigerant level / flow state through a visual window, and to automatically trigger switch action according to the high / low pressure working condition of the system, so as to realize protection of core components such as the compressor and the expansion valve, and is a “visual monitoring and protection center” for safe operation of the system.

[0025] The pipeline of the air conditioner refrigeration system, the refrigerant circulation branch pipeline of the evaporative panel, and the outside of the mixer 10 are all wrapped with a heat preservation layer 10-4, so as to protect the refrigerant from absorbing heat when flowing in the pipeline and reduce the refrigeration effect, thereby improving the refrigeration effect.

[0026] The mixer 10 includes a tank body 10-5 and an L-shaped outlet conduit 10-6, the tank body 10-5 is provided with a first liquid inlet pipe 10-1, a second liquid inlet pipe 10-2 and a mixed liquid outlet pipe 10-3 on the side wall near the top position, and one end of the L-shaped outlet conduit 10-6 is inserted into the mixed liquid outlet pipe 10-3 and the other end extends to the bottom position in the tank body 10-5.

[0027] As Figure 5The refrigerant enters the tank 10-5 from the first liquid inlet pipe 10-1 before entering the air conditioner evaporator assembly 11. Since the refrigerant flowing in the evaporating plate 5 is not completely evaporated, part of the liquid refrigerant flows out of the evaporating plate 5 (back gas superheat). When flowing into the three-way joint two 8, since the second power-off normally closed electromagnetic cut-off valve 9 is open, the liquid will flow from the second liquid inlet pipe 10-2, but the gaseous refrigerant is not easy to flow into the tank 10-5 (because the L-shaped outlet pipe 10-6 is inserted into the bottom of the tank 10-5 and is sealed by the liquid, the gas flowability is poor). Part of the refrigerant in the evaporating plate 5 pipeline is not completely evaporated, which can improve the utilization rate of the refrigerant and improve the energy saving efficiency.

[0028] The compressor 1 is a variable frequency compressor, and the power of the variable frequency compressor needs to be adjusted according to the sum of the refrigerant flow required by the air conditioner evaporator assembly 11 and the refrigerant flow required by the evaporating plate 5.

[0029] The sum of the refrigerant flow required by the air conditioner evaporator assembly 11 and the refrigerant flow required by the evaporating plate 5 can be adjusted more efficiently by combining the variable frequency compressor to adjust the refrigerant flow speed and flow control.

[0030] The temperature detection sensor monitors the temperature to determine whether the second power-off normally closed electromagnetic cut-off valve 9 is open or closed. When the temperature detected by the temperature detection sensor is lower than 2℃, the second power-off normally closed electromagnetic cut-off valve 9 is opened. When the temperature detected by the temperature detection sensor is higher than 2℃, the second power-off normally closed electromagnetic cut-off valve 9 is closed.

[0031] The temperature detection sensor detects the temperature of the refrigerant flowing out of the evaporating plate 5 to determine whether the refrigerant is not completely volatilized into steam. Generally, when the temperature is above 2℃, the refrigerant is basically evaporated into gas. When the temperature is higher than 2℃, the second power-off normally closed electromagnetic cut-off valve 9 can be closed, and the liquid refrigerant in the evaporating plate 5 does not need to be recovered. The gaseous refrigerant can flow to the three-way joint three 14 and enter the gas-liquid separator 15 for gas-liquid separation.

[0032] The air conditioner evaporator assembly 11 is provided with a temperature controller, and the temperature controller is provided with a sensor for detecting the indoor temperature. When the indoor temperature reaches the set value, the temperature controller is started to close the first expansion valve assembly 13. When the indoor temperature is higher than the set temperature value, the temperature controller is started to open the first expansion valve assembly 13 to flow the refrigerant.

[0033] The air conditioner evaporator assembly 11 is provided with a module for monitoring the indoor temperature. When the indoor temperature reaches or approaches the set temperature requirement, the liquid refrigerant flowing into the air conditioner evaporator assembly 11 can be reduced or closed to reduce or close the refrigeration of the air conditioner evaporator assembly 11, and only the refrigeration of the battery is started to reduce the temperature. To prevent the indoor refrigeration temperature from being too low.

[0034] In the description of the present specification, the description of the terms "one embodiment", "an example", "a specific example" and the like means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In the present specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Also, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in an appropriate manner.

[0035] The preferred embodiments of the application disclosed above are only used to help explain the application. The preferred embodiments do not describe all the details of the application and limit the application to the specific embodiments described. Obviously, many modifications and variations can be made according to the content of the present specification. The present specification selects and specifically describes these embodiments in order to better explain the principles and practical applications of the application, so that those skilled in the art can well understand and utilize the application. The application is limited only by the claims and their full scope and equivalents.

Claims

1. A highly efficient energy-saving method for coordinating air conditioning systems based on battery refrigeration with heat recovery, characterized in that: The specific method is as follows: S1: Connect a refrigerant circulation branch with a battery-powered evaporator plate (5) in parallel on the refrigerant circulation branch of the air conditioning refrigeration system; S2: The air conditioning refrigeration system includes a compressor (1), a subcooled condenser (2), a first normally closed solenoid shut-off valve (7), a first expansion valve assembly (13), an air conditioning evaporator assembly (11), and a gas-liquid separator (15). After the refrigerant enters from the air conditioning evaporator assembly (11), the refrigerant that has absorbed heat is discharged. The refrigerant flows into the gas-liquid separator (15) to separate the gas and is drawn into the compressor (1) to be compressed into a high-temperature and high-pressure gas and flows into the subcooled condenser (2). The subcooled condenser (2) releases the refrigerant liquid through the first normally closed solenoid shut-off valve (7) and the first expansion valve assembly (13) and connects it to the refrigerant input terminal on the air conditioning evaporator assembly (11). A mixer (10) is set on the input pipeline between the first expansion valve assembly (13) and the air conditioning evaporator assembly (11). The refrigerant circulation branch of the evaporator plate heat exchanger (5) includes the evaporator plate heat exchanger (5) and the second expansion valve assembly (4). A three-way connector (6) is provided on the pipe between the liquid outlet of the subcooled condenser (2) and the first expansion valve assembly (13). The branch pipe of the three-way connector (6) is connected to the liquid inlet of the second expansion valve assembly (4). The liquid release port of the second expansion valve assembly (4) is connected to the inlet of the evaporator plate heat exchanger (5). The gas outlet of the evaporator plate heat exchanger (5) is connected to the gas outlet of the second expansion valve assembly (4) through a pipe. A three-way connector (8) is provided on the pipe of the gas outlet of the second expansion valve assembly (4). The branch pipe of the three-way connector (8) is connected to the mixer (10). A second normally closed solenoid valve (9) is provided on the pipe connected to the mixer (10). A third normally closed solenoid valve (12) is provided on the pipe between the three-way connector (8) and the air conditioner evaporator assembly (11) and the output end of the first expansion valve assembly (13). The first expansion valve assembly (13) and the second expansion valve assembly (4) are thermostatic expansion valves, which are equipped to automatically adjust the refrigerant flow rate according to the temperature of the refrigerant flowing through the outlet during evaporation heat exchange. A first normally closed electromagnetic shut-off valve (7) is installed on the input pipe of the first thermostatic expansion valve (13). S3: The thermostat installed in the air conditioner evaporator assembly (11) and the temperature detection sensor installed on the evaporator core are used to control the opening and closing of the first normally closed solenoid valve (7), the second normally closed solenoid valve (9), and the third normally closed solenoid valve (12) associated with the air conditioner evaporator assembly (11) by monitoring the cooling conditions required by the air conditioner evaporator assembly (11) and the temperature detected by the temperature detection sensor. When the temperature detected by the temperature detection sensor is higher than the set temperature, the first normally closed solenoid valve (7) and the second normally closed solenoid valve (9) are activated to open the flow, and the third normally closed solenoid valve (12) is closed. When the temperature detected by the temperature detection sensor is lower than the set temperature, the first normally closed solenoid valve (7) and the second normally closed solenoid valve (9) are activated to close, and the third normally closed solenoid valve (12) is activated to open the flow.

2. The method for coordinating high-efficiency energy saving of air conditioning systems based on battery refrigeration with heat recovery according to claim 1, characterized in that, The first expansion valve assembly (13) and the first normally closed electromagnetic shut-off valve (7) are combined into an integrated unit (16), and at least one of the first expansion valve assembly (13) and the second expansion valve assembly (4) is an electronic expansion valve. If the first expansion valve assembly (13) and the first normally closed electromagnetic shut-off valve (7) are combined into an integrated unit (16), the mixer (10) is installed on the pipeline between the refrigerant output end of the first electronic expansion valve (18) and the input port of the air conditioner evaporator assembly (11).

3. The method for coordinating high-efficiency energy saving of air conditioning systems based on battery refrigeration with heat recovery according to claim 1, characterized in that, The pipe between the subcooled condenser (2) and the three-way connector (6) is equipped with a liquid pressure switch (or liquid pressure sensor) (3).

4. The method for coordinating high-efficiency energy saving of air conditioning systems based on battery refrigeration with heat recovery according to claim 1, characterized in that, The air conditioning refrigeration system pipes, the refrigerant circulation branch pipes of the evaporator heat exchanger, and the mixer (10) are all wrapped with an insulation layer (10-4).

5. The method for coordinating high-efficiency energy saving of air conditioning systems based on battery refrigeration with heat recovery according to claim 1, characterized in that, The mixer (10) includes a tank (10-5) and an L-shaped outlet conduit (10-6). The tank (10-5) has a first inlet pipe (10-1), a second inlet pipe (10-2), and a mixing outlet pipe (10-3) on its side wall near the top. One end of the L-shaped outlet conduit (10-6) is connected to the mixing outlet pipe (10-3), and the other end extends to the bottom of the tank (10-5).

6. The method for coordinating high-efficiency energy saving of air conditioning systems based on battery refrigeration with heat recovery according to claim 1, characterized in that, The compressor (1) is a variable frequency compressor. The power of the variable frequency compressor needs to be adjusted according to the sum of the refrigerant flow required by the air conditioner evaporator assembly (11) and the refrigerant flow required by the evaporator plate heat exchanger (5).

7. The method for coordinating high-efficiency energy saving of air conditioning systems based on battery refrigeration with heat recovery according to claim 1, characterized in that, The air conditioner evaporator assembly (11) is equipped with a thermostat. The thermostat contains a sensor for detecting indoor temperature. When the indoor temperature reaches the set value, the thermostat is activated to close the first normally closed solenoid valve (7) and the second normally closed solenoid valve (9) and open the third normally closed solenoid valve (12). When the indoor temperature is higher than the set temperature value, the thermostat is activated to open the first normally closed solenoid valve (7) and the second normally closed solenoid valve (9) and close the third normally closed solenoid valve (12) to allow refrigerant to flow.

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