Unit energy saving control system, method and device

Abstract

The application relates to a unit energy-saving control system, method and device, the method comprising: acquiring indoor temperature, evaporating temperature of a unit and outdoor temperature; if the indoor temperature does not reach a set temperature, controlling the unit to enter a refrigeration state; according to a temperature difference between the evaporating temperature and the outdoor temperature and a current power price peak or valley period, controlling the unit to enter different energy-saving refrigeration modes, wherein the different energy-saving refrigeration modes can be switched, and the different energy-saving refrigeration modes all need to use a bucket pump. The application realizes energy-saving and power-saving of an air conditioning unit.

Description

Technical Field

[0001] This application relates to the field of air conditioning technology, and in particular to a unit energy-saving control system, method and device. Background Technology

[0002] In industrial refrigeration, electricity costs account for a large proportion of energy consumption expenses. In the context of dual-carbon development, the use of more energy-efficient and environmentally friendly products and systems has become a widespread demand. Currently, refrigeration systems typically employ only one cooling mode, resulting in high electricity costs. There is currently no good solution to the problem of excessively high electricity consumption in refrigeration systems. Summary of the Invention

[0003] This application provides an energy-saving control system, method, and apparatus for a unit to solve the problem of excessive electricity consumption in refrigeration systems.

[0004] In the first aspect, this application provides a unit energy-saving control system, including a return gas pipe, a liquid supply pipe, an oil separator, a condenser, and a compressor. The system also includes a barrel pump, a switching solenoid valve, a switching shut-off valve four, a switching shut-off valve three, and a direct expansion liquid supply solenoid valve.

[0005] The tank pump is connected to the return gas pipe and the liquid supply pipe respectively, and the tank pump is used to store refrigerant;

[0006] A switching solenoid valve and a switching shut-off valve four are provided on the pipeline between the condenser and the compressor. A switching shut-off valve three is provided between the oil separator and the condenser. A direct expansion liquid supply solenoid valve is provided on the liquid supply pipe. The switching solenoid valve, the switching shut-off valve four, the switching shut-off valve three, and the direct expansion liquid supply solenoid valve are used to switch between different refrigeration modes.

[0007] Optionally, the system further includes a tank pump supply shut-off valve, a tank pump supply solenoid valve, a tank pump supply throttling regulating valve, a second supply solenoid valve, and a supply regulating valve;

[0008] The tank pump is connected to the return gas pipe through a first outlet, and to the liquid supply pipe through a first inlet at a first interface. A direct expansion liquid supply solenoid valve is provided between the first interface and the liquid supply shut-off valve. The tank pump is connected to the liquid supply pipe through a second outlet at a second interface, which is located between the direct expansion liquid supply solenoid valve and the liquid supply shut-off valve. The tank pump is connected to the outlet of the evaporator through a second inlet. A tank pump liquid supply shut-off valve, a tank pump liquid supply solenoid valve, and a tank pump liquid supply throttling regulating valve are provided between the first inlet and the first interface. A second liquid supply solenoid valve and a liquid supply regulating valve are provided between the inlet of the evaporator and the dryer filter.

[0009] Secondly, this application provides a unit energy-saving control method, the method comprising:

[0010] Obtain indoor temperature, unit evaporation temperature, and outdoor temperature;

[0011] If the indoor temperature does not reach the set temperature, the unit will be controlled to enter the cooling state.

[0012] Based on the temperature difference between the evaporation temperature and the outdoor temperature, as well as the current peak or off-peak electricity price period, the unit is controlled to enter different energy-saving cooling modes. The different energy-saving cooling modes can be switched, and each energy-saving cooling mode requires the use of a tank pump.

[0013] Optionally, based on the temperature difference between the evaporation temperature and the outdoor temperature, and the current peak or off-peak electricity price period, the unit can be controlled to enter different energy-saving cooling modes, including:

[0014] If the temperature difference is less than the temperature difference threshold and the current electricity price is in peak or off-peak period, then the first energy-saving cooling mode is entered.

[0015] The first energy-saving cooling mode is used to cool the air during off-peak electricity price periods and deliver the throttled refrigerant to the tank pump, or to cool the air using the throttled refrigerant stored in the tank pump during peak electricity price periods.

[0016] Optionally, the method for implementing the first energy-saving cooling mode includes:

[0017] If the current electricity price is in a low period, the refrigerant output from the compressor is controlled to enter the expansion valve for throttling and pressure reduction. The refrigerant after throttling and pressure reduction enters the evaporator to exchange heat with the indoor air. The refrigerant output from the compressor is throttled through the tank pump liquid supply solenoid valve and the tank pump liquid supply throttling regulating valve, and the throttled refrigerant is input into the tank pump for storage.

[0018] If the indoor temperature reaches the set temperature and the refrigerant in the tank pump reaches the set liquid level, then exit the first energy-saving cooling mode.

[0019] Optionally, the method for implementing the first energy-saving cooling mode includes:

[0020] If the current electricity price is at its peak, the refrigerant discharged from the control tank pump will enter the evaporator through the second liquid supply solenoid valve, so that the refrigerant can exchange heat with the indoor air in the evaporator, and the refrigerant after heat exchange will flow back to the tank pump.

[0021] If the indoor temperature reaches the set temperature, the first energy-saving cooling mode will be exited.

[0022] If the indoor temperature does not reach the set temperature and the refrigerant in the tank pump reaches the minimum liquid level, the system will switch from the first energy-saving cooling mode to the normal cooling mode.

[0023] Optionally, based on the temperature difference between the evaporation temperature and the outdoor temperature, and the current peak or off-peak electricity price period, the unit can be controlled to enter different energy-saving cooling modes, including:

[0024] If the temperature difference between the evaporation temperature and the outdoor temperature is greater than or equal to the temperature difference threshold, then the second energy-saving cooling mode is entered.

[0025] In the second energy-saving cooling mode, when the outdoor temperature is lower than a certain temperature, the refrigerant stored in the tank pump is supplied to the terminal. The gaseous refrigerant that evaporates after phase change heat is discharged to the condenser for condensation. The refrigerant that condenses into liquid enters the tank pump to complete the heat exchange cycle.

[0026] Optionally, the method for implementing the second energy-saving cooling mode includes:

[0027] The compressor is turned off, and the refrigerant flowing out of the condenser is throttled through the tank pump supply solenoid valve and the tank pump supply throttling regulating valve so that the throttled refrigerant flows into the tank pump.

[0028] The refrigerant flowing from the tank pump is controlled to enter the evaporator through the second liquid supply solenoid valve, so that the refrigerant can exchange heat with the indoor air in the evaporator.

[0029] After heat exchange, the refrigerant flows back to the condenser via the tank pump and the switching solenoid valve.

[0030] Optionally, after determining that the temperature difference is less than a temperature difference threshold, the method further includes:

[0031] If the current electricity price is flat, then switch to normal cooling mode;

[0032] In the normal cooling mode, if the refrigerant balance in the tank pump is greater than or equal to the preset balance, the refrigerant that has been throttled in the tank pump is used for cooling.

[0033] When the refrigerant balance in the tank pump is less than the preset balance, the refrigerant output by the compressor is controlled to flow into the expansion valve through the first liquid supply solenoid valve. After the throttled refrigerant exchanges heat with the indoor air in the evaporator, the refrigerant is controlled to flow back to the compressor through the tank pump.

[0034] Optionally, after the control unit enters different energy-saving cooling modes, the method further includes:

[0035] The unit is controlled to enter defrost mode, wherein the evaporator to be defrosted is turned on and the evaporator that does not need to be defrosted is turned off. The operation mode of defrost mode is the same as the operation mode during peak electricity price period in the first energy-saving cooling mode.

[0036] Control the unit to start, and control all shut-off valves to open and all solenoid valves to close;

[0037] If the indoor temperature does not reach the set temperature, the evaporator that does not require defrosting will be turned on.

[0038] If the indoor temperature has reached the set temperature, the evaporator will remain on.

[0039] Thirdly, this application provides a unit energy-saving control device, the device comprising:

[0040] The acquisition module is used to acquire indoor temperature, unit evaporation temperature, and outdoor temperature.

[0041] The first control module is used to control the unit to enter the cooling state if the indoor temperature does not reach the set temperature.

[0042] The second control module is used to control the unit to enter different energy-saving cooling modes based on the temperature difference between the evaporation temperature and the outdoor temperature, as well as the current peak and off-peak electricity price periods. The different energy-saving cooling modes can be switched, and each energy-saving cooling mode requires the use of a tank pump.

[0043] Fourthly, this application provides an electronic device, comprising: at least one communication interface; at least one bus connected to the at least one communication interface; at least one processor connected to the at least one bus; and at least one memory connected to the at least one bus.

[0044] Fifthly, this application also provides a computer storage medium storing computer-executable instructions for executing the unit energy-saving control method described in any of the preceding claims of this application.

[0045] Compared with the prior art, the above-mentioned technical solution provided in this application has the following advantages: when the indoor temperature is high, the unit enters the energy-saving cooling mode. There are multiple energy-saving cooling modes, but they are all based on the barrel pump. The temperature difference between the evaporation temperature and the outdoor temperature, as well as the peak and valley periods of electricity prices, can be combined to enter different energy-saving cooling modes. Furthermore, mode switching can be achieved between different energy-saving cooling modes to realize energy saving and power saving of the air conditioning unit. Attached Figure Description

[0046] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with the invention and, together with the description, serve to explain the principles of the invention.

[0047] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, those skilled in the art can obtain other drawings based on these drawings without creative effort.

[0048] One or more embodiments are illustrated by way of example with reference numerals in the accompanying drawings. These illustrations do not constitute a limitation on the embodiments. Elements with the same reference numerals in the drawings are denoted as similar elements. Unless otherwise stated, the figures in the drawings are not to be limited by scale.

[0049] Figure 1 This is a schematic diagram of a refrigeration system in the prior art;

[0050] Figure 2 A schematic diagram of an energy-saving control system provided in an embodiment of this application;

[0051] Figure 3 A flowchart illustrating a method for energy-saving control of a generating unit, as provided in this application embodiment;

[0052] Figure 4 A flowchart illustrating the exit from the first energy-saving cooling mode during off-peak electricity prices, provided as an embodiment of this application;

[0053] Figure 5 A flowchart illustrating the exit from the first energy-saving cooling mode during peak electricity price periods, provided in an embodiment of this application;

[0054] Figure 6 A flowchart for exiting the second energy-saving cooling mode provided in an embodiment of this application;

[0055] Figure 7 A flowchart for exiting the normal cooling mode provided in this application embodiment;

[0056] Figure 8 A flowchart illustrating the defrosting cold compensation mode provided in this application embodiment;

[0057] Figure 9 This is a schematic diagram of the overall energy-saving control process of the unit provided in the embodiments of this application;

[0058] Figure 10 A schematic diagram of the structure of a unit energy-saving control device provided in an embodiment of this application;

[0059] Figure 11This is a schematic diagram of the structure of an electronic device provided in an embodiment of this application. Detailed Implementation

[0060] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0061] The following disclosure provides numerous different embodiments or examples for implementing various structures of the invention. To simplify the disclosure, specific examples of components and arrangements are described below. These are merely examples and are not intended to limit the scope of the invention. Furthermore, reference numerals and / or letters may be repeated in different examples. Such repetition is for simplification and clarity and does not in itself indicate a relationship between the various embodiments and / or arrangements discussed.

[0062] Figure 1 This is a schematic diagram of a refrigeration system in the prior art, in which the refrigerant flows in the following direction: compressor - oil separator - condenser - liquid receiver - evaporator - compressor.

[0063] This application provides a unit energy-saving control system, in Figure 1 Based on the above, the following have been added: a tank pump, a switching solenoid valve, a switching shut-off valve, a switching shut-off valve, a direct expansion liquid supply solenoid valve, a tank pump liquid supply shut-off valve, a tank pump liquid supply solenoid valve, a tank pump liquid supply throttling regulating valve, a second liquid supply solenoid valve, and a liquid supply regulating valve. Figure 2 A schematic diagram of an energy-saving control system provided in an embodiment of this application.

[0064] The tank pump is connected to the return gas pipe and the liquid supply pipe respectively, and the tank pump is used to store refrigerant; a switching solenoid valve and a switching shut-off valve four are provided on the pipe between the condenser and the compressor, a switching shut-off valve three is provided between the oil separator and the condenser, and a direct expansion liquid supply solenoid valve is provided on the liquid supply pipe. The switching solenoid valve, the switching shut-off valve four, the switching shut-off valve three, and the direct expansion liquid supply solenoid valve are used to switch between different refrigeration modes.

[0065] The tank pump is connected to the return gas pipe through the first outlet, and to the liquid supply pipe through the first inlet at the first interface. A direct expansion liquid supply solenoid valve is provided between the first interface and the liquid supply shut-off valve. The tank pump is connected to the liquid supply pipe through the second outlet at the second interface. The second interface is located between the direct expansion liquid supply solenoid valve and the liquid supply shut-off valve. The tank pump is connected to the outlet of the evaporator through the second inlet. A tank pump liquid supply shut-off valve, a tank pump liquid supply solenoid valve, and a tank pump liquid supply throttling regulating valve are provided between the first inlet and the first interface. A second liquid supply solenoid valve and a liquid supply regulating valve are provided between the inlet of the evaporator and the dryer filter.

[0066] This system can implement one normal cooling mode and two energy-saving cooling modes, thus switching to different cooling modes for different situations.

[0067] Based on the same technical concept, this application also provides a unit energy-saving control method, such as... Figure 3 As shown, the method includes:

[0068] Step 301: Obtain the indoor temperature, the evaporation temperature of the unit, and the outdoor temperature.

[0069] The unit is used to cool the indoor space. The unit uses a storage temperature sensor to obtain the indoor temperature, an outdoor temperature sensor to obtain the outdoor temperature, and an evaporation temperature sensor to detect the evaporation temperature of the unit.

[0070] Step 302: If the indoor temperature does not reach the set temperature, control the unit to enter the cooling state.

[0071] If the indoor temperature does not reach the set temperature, it indicates that the indoor temperature is too high. In this case, the unit needs to be controlled to enter the cooling mode. This application includes three cooling modes. Which cooling mode to enter depends on some conditions.

[0072] Step 303: Based on the temperature difference between the evaporation temperature and the outdoor temperature, and the current peak or off-peak electricity price period, control the unit to enter different energy-saving cooling modes. Switching between different energy-saving cooling modes is possible, and each mode requires the use of a tank pump.

[0073] The temperature difference is calculated by subtracting the outdoor temperature from the evaporation temperature. Based on this temperature difference threshold, the unit determines whether to enter the second or first energy-saving cooling mode. The first energy-saving cooling mode has two sub-modes. Then, depending on whether the current electricity price is during peak or off-peak hours, the appropriate sub-mode of the first energy-saving cooling mode is selected. The refrigerant flow direction differs depending on the energy-saving cooling mode.

[0074] Electricity prices are divided into peak, flat, and valley periods, and the electricity price varies at different times. In this embodiment, the first energy-saving cooling mode is related to the peak and valley periods of electricity prices, while the normal cooling mode is related to the flat period of electricity prices.

[0075] In this application, when the indoor temperature is high, the unit enters an energy-saving cooling mode. There are multiple energy-saving cooling modes, but they are all based on the tank pump. The unit can enter different energy-saving cooling modes by combining the temperature difference between the evaporation temperature and the outdoor temperature, as well as the peak and off-peak electricity prices. The unit can switch between different energy-saving cooling modes to achieve energy saving and power saving of the air conditioning unit.

[0076] The first energy-saving cooling mode provides cooling during off-peak electricity prices and delivers the throttled refrigerant to the tank pump for storage, or uses the throttled refrigerant in the tank pump for cooling during peak electricity prices. The second energy-saving cooling mode is used when the outdoor temperature is below a certain level. The refrigerant stored in the tank pump is supplied to the terminal. After the refrigerant undergoes phase change and heat transfer, the vaporized gaseous refrigerant is discharged to the condenser for condensation. The condensed liquid refrigerant then enters the tank pump to complete the heat exchange cycle, making full use of natural cold sources where possible.

[0077] Based on the temperature difference between the evaporation temperature and the outdoor temperature, as well as the current peak or off-peak electricity price period, the unit is controlled to enter different energy-saving cooling modes. There are two implementation methods, and each implementation method is described in detail below.

[0078] In the first embodiment, the unit enters the first energy-saving cooling mode.

[0079] If the temperature difference between the evaporation temperature and the outdoor temperature is less than the temperature difference threshold, and the current electricity price is during peak or off-peak hours, then the first energy-saving cooling mode will be activated. The execution method of the first energy-saving cooling mode differs depending on whether the electricity price is during peak or off-peak hours, and specifically includes the following two execution methods.

[0080] 1. The first energy-saving cooling mode corresponding to the off-peak electricity price period.

[0081] If it is during a low electricity price period, the refrigerant is split into two paths, forming two refrigerant flow directions. Compressor 1 is turned on, direct expansion liquid supply solenoid valve 20 is turned on, first liquid supply solenoid valve 9 is turned on, second liquid supply solenoid valve 11 is turned off, evaporator 6 is turned on, tank pump liquid supply solenoid valve 16 is turned on, tank pump liquid supply filter 17 is turned on, tank pump liquid supply regulating solenoid valve 18 is turned on, and tank pump liquid supply throttling regulating valve 19 is turned on.

[0082] The refrigeration process in the first energy-saving refrigeration mode is as follows: High-temperature, high-pressure gaseous refrigerant discharged from compressor 1 → enters oil separator 2 to remove lubricating oil carried in the refrigerant gas → high-temperature, high-pressure refrigerant vapor enters condenser 3 to become high-pressure, medium-temperature refrigerant liquid → receiver 4. The liquid from the receiver is divided into two paths: One path is: liquid supply pipe → first liquid supply solenoid valve 9 → liquid refrigerant enters expansion valve 10 for throttling and pressure reduction, becoming a low-temperature, low-pressure gas-liquid mixture refrigerant → low-temperature, low-pressure refrigerant enters evaporator 6 to exchange heat with indoor air, becoming a low-temperature, low-pressure gaseous refrigerant → return pipe → low-temperature, low-pressure gaseous refrigerant → tank pump 5 → low-temperature, low-pressure refrigerant vapor enters compressor 1 to become high-temperature, high-pressure refrigerant gas. The other path is: liquid supply pipe → pump liquid supply solenoid valve 16 → tank pump liquid supply filter 17 → tank pump liquid supply regulating solenoid valve 18 → liquid refrigerant enters tank pump liquid supply throttling regulating valve 19 for throttling and pressure reduction, becoming a low-temperature, low-pressure gas-liquid mixture refrigerant → tank pump 5 for storage.

[0083] In the refrigerant circuit flowing through the evaporator, the refrigerant exchanges heat with the indoor air in the evaporator to achieve indoor cooling; in the refrigerant flow to the tank pump, the refrigerant is throttled and depressurized at the tank pump supply throttling valve 19, utilizing the lowest electricity cost during off-peak hours to reduce the electricity consumption of refrigerant throttling and depressurization.

[0084] To exit the first energy-saving cooling mode, the indoor temperature must reach the set temperature and the refrigerant in the tank pump must reach the set liquid level, meaning the indoor cooling is successful and there is enough refrigerant in the tank pump. The specific value of the set liquid level can be determined according to the size of the tank pump.

[0085] The flowchart for exiting the first energy-saving cooling mode during off-peak electricity prices is as follows: Figure 4 As shown. If it is during a low electricity price period, the storage temperature sensor detects whether the indoor temperature T1 has reached the set temperature T2. If not, the first liquid supply solenoid valve 9, the direct expansion liquid supply solenoid valve 20, the evaporator 6, and the compressor 1 remain open. If they have reached the set temperature, the compressor 1, the evaporator 6, the first liquid supply solenoid valve 9, and the direct expansion liquid supply solenoid valve 20 are closed.

[0086] If the indoor temperature T1 has reached the set temperature T2, the liquid level sensor needs to detect whether the liquid level in the tank pump has reached the set level. If it has, the pump supply solenoid valve 16, the tank pump supply filter 17, the tank pump supply regulating solenoid valve 18, and the tank pump supply throttling regulating valve 19 will be closed, exiting the first energy-saving cooling mode. If not, the pump supply solenoid valve 16, the tank pump supply filter 17, the tank pump supply regulating solenoid valve 18, and the tank pump supply throttling regulating valve 19 will be opened.

[0087] The order of determining whether the indoor temperature T1 has reached the set temperature T2 and determining whether the liquid level in the tank pump has reached the set liquid level is only an example. The order can be changed or they can be performed simultaneously. This application does not impose any specific restrictions.

[0088] 2. The first energy-saving cooling mode corresponding to peak electricity price periods.

[0089] If it's during peak electricity price periods, where electricity prices are higher, the pre-cooled refrigerant stored in the tank pump can be used for cooling, eliminating the need for a compressor. The pump consumes less power than the compressor, reducing electricity costs. In this mode, compressor 1 is off, direct expansion liquid supply solenoid valve 20 is off, second liquid supply solenoid valve 11 is on, first liquid supply solenoid valve 9 is off, evaporator 6 is on, and tank pump liquid supply solenoid valve 16, tank pump liquid supply filter 17, tank pump liquid supply regulating solenoid valve 18, and tank pump liquid supply throttling regulating valve 19 are off.

[0090] Refrigeration process: Low-temperature, low-pressure gas-liquid mixed refrigerant discharged from the tank pump 5 → Second liquid supply solenoid valve 11 → Liquid supply regulating valve 12 → Low-temperature, low-pressure refrigerant enters the evaporator 6 and exchanges heat with the indoor air to become low-temperature, low-pressure gaseous refrigerant → Return gas pipe → Tank pump 5.

[0091] During peak electricity price periods, there are two ways to exit the first energy-saving cooling mode: one is when the indoor temperature reaches the set temperature, indicating that cooling has ended, and the first energy-saving cooling mode is exited; the other is when the indoor temperature has not reached the set temperature and the refrigerant in the tank pump has reached the minimum liquid level, indicating that the tank pump can no longer output refrigerant and the cooling is not up to standard, and the normal cooling mode needs to be used. In the normal cooling mode, the refrigerant output by the compressor is throttled and reduced in pressure, and then the refrigerant enters the evaporator to exchange heat with the indoor air, and then flows back to the compressor.

[0092] The flowchart for exiting the first energy-saving cooling mode during peak electricity price periods is as follows: Figure 5 As shown. During peak hours, evaporator 6 is on, second liquid supply solenoid valve 11 is on, and tank pump 5 is on. At this time, the liquid level sensor in the tank pump will detect whether the liquid level in the tank pump has reached the minimum liquid level. If the minimum liquid level is reached, the unit will switch to normal cooling mode; if the minimum liquid level is not reached, the first energy-saving cooling mode will continue to be used. The indoor temperature sensor will detect whether the indoor temperature T1 has reached the set temperature T2. If the set temperature T2 is reached, tank pump 5 will be off, second liquid supply solenoid valve 11 will be off, and evaporator 6 will be off. If the set temperature T2 is not reached, evaporator 6 will remain on, second liquid supply solenoid valve 11 will remain on, and tank pump 5 will remain on.

[0093] The first energy-saving cooling mode utilizes peak and off-peak electricity prices. During off-peak hours, a bucket pump stores the throttled low-temperature refrigerant, while during peak hours, the compressor is shut off. The bucket pump then supplies the low-temperature refrigerant in the bucket to the terminals for cooling. If the refrigerant in the bucket pump runs out, the compressor must continue to operate for cooling. The power of the bucket pump is lower than that of the compressor, which plays a role in peak shaving and valley filling, making it a relatively energy-efficient cooling mode.

[0094] In the second embodiment, the unit enters a second energy-saving cooling mode.

[0095] The system switching shut-off valve 1 (21) and switching shut-off valve 3 (24) are closed, while the remaining shut-off valves are open. The first liquid supply solenoid valve 9 is closed, the second liquid supply solenoid valve 11 is open, and the switching solenoid valve 23 is open. The direct expansion liquid supply solenoid valve 20 is closed, the tank pump liquid supply solenoid valve 16 is open, the tank pump liquid supply filter 17 is open, the tank pump liquid supply regulating solenoid valve 18 is open, and the tank pump liquid supply regulating solenoid valve 19 is open.

[0096] The refrigeration process of the second energy-saving refrigeration mode is as follows: Low-temperature and low-pressure refrigerant vapor enters the condenser 3 and becomes low-temperature and low-pressure refrigerant liquid → liquid receiver 4 → liquid supply solenoid valve 16 of the tank pump → liquid supply filter 17 of the tank pump → liquid supply regulating solenoid valve 18 of the tank pump → liquid supply throttling regulating valve 19 of the tank pump → the low-temperature and low-pressure refrigerant liquid stored in the tank pump passes through the tank pump → liquid supply pipe → liquid supply shut-off valve 1 7 → dryer filter 8 → second liquid supply solenoid valve 11 → liquid supply regulating valve 12 → liquid supply shut-off valve 2 14 → the low-temperature and low-pressure refrigerant enters the evaporator 6 and exchanges heat with the indoor air to become low-temperature and low-pressure gaseous refrigerant → return gas shut-off valve 13 → tank pump 5 → return gas pipe → switching solenoid valve 23 → condenser 3.

[0097] If the temperature difference between the evaporation temperature and the outdoor temperature is greater than or equal to the temperature difference threshold, it indicates that the outdoor temperature is low. In this case, the low-temperature refrigerant stored in the tank pump is supplied to the terminal. After the refrigerant undergoes phase change and heat transfer, the gaseous refrigerant that evaporates is discharged to the condenser for condensation. The condensed liquid refrigerant then enters the tank pump to complete the heat exchange cycle. The second energy-saving refrigeration mode can run continuously, requiring only the tank pump to complete the refrigeration cycle, making it the most energy-efficient refrigeration mode.

[0098] If the indoor temperature reaches the set temperature, cooling will stop and the second energy-saving cooling mode will exit. The flowchart for exiting the second energy-saving cooling mode is as follows: Figure 6As shown. When the refrigeration unit is turned on, it is in the second energy-saving refrigeration mode. Switching shut-off valve 24 is closed, second liquid supply solenoid valve 11 is open, tank pump liquid supply solenoid valve 16 is open, switching solenoid valve 23 is open, tank pump liquid supply regulating solenoid valve 18 is open, evaporator 6 is open, tank pump 5 is open. The storage temperature sensor detects whether the indoor temperature T1 has reached the set temperature T2. If the set temperature T2 has been reached, tank pump 5 is closed, evaporator 6 is closed, second liquid supply solenoid valve 11 is closed, tank pump liquid supply solenoid valve 16 is closed, switching solenoid valve 23 is closed, tank pump liquid supply regulating solenoid valve 18 is closed, and switching shut-off valve 24 is open. If the set temperature T2 has not been reached, switching shut-off valve 24 remains closed, second liquid supply solenoid valve 11 is open, tank pump liquid supply solenoid valve 16 is open, switching solenoid valve 23 is open, tank pump liquid supply regulating solenoid valve 18 is open, evaporator 6 is open, and tank pump 5 is open.

[0099] As an optional implementation, if it is determined that the temperature difference is less than the temperature difference threshold and the current electricity price is in a flat range, then the normal cooling mode is entered.

[0100] In normal cooling mode, if the refrigerant reserve in the tank pump is greater than or equal to the preset reserve, the refrigerant that has been throttled in the tank pump will be used first for cooling. This adopts the first energy-saving cooling mode corresponding to the peak electricity price period, making full use of peak and off-peak electricity prices to achieve energy saving. When the refrigerant reserve in the tank pump is less than the preset reserve, the refrigerant output from the compressor will be used for cooling through the first liquid supply solenoid valve, expansion valve, and evaporator.

[0101] When the refrigerant balance is less than the preset balance, the system switching shut-off valve 25 is closed, the other shut-off valves are open, the first liquid supply solenoid valve 9 is open, the second liquid supply solenoid valve 11 is closed, the tank pump liquid supply solenoid valve 16 is closed, and the switching solenoid valve 23 is closed.

[0102] The refrigeration process in normal refrigeration mode is as follows: High-temperature and high-pressure gaseous refrigerant discharged from compressor 1 → enters oil separator 2 to remove lubricating oil carried in the refrigerant gas → high-temperature and high-pressure refrigerant vapor enters condenser 3 to become high-pressure and medium-temperature refrigerant liquid → liquid supply pipe → first liquid supply solenoid valve 9 → liquid refrigerant enters expansion valve 10 for throttling and pressure reduction to become low-temperature and low-pressure gas-liquid mixed refrigerant → low-temperature and low-pressure refrigerant enters evaporator 6 to exchange heat with indoor air to become low-temperature and low-pressure gaseous refrigerant → return pipe → low-temperature and low-pressure gaseous → drum pump 5 → low-temperature and low-pressure refrigerant vapor enters compressor 1 to become high-temperature and high-pressure refrigerant gas.

[0103] If the indoor temperature reaches the set temperature, cooling will stop and the normal cooling mode will be exited. The flowchart for exiting the normal cooling mode is as follows: Figure 7As shown. When the refrigeration unit is turned on and in normal refrigeration mode, the first liquid supply solenoid valve 9 and the direct expansion liquid supply solenoid valve 20 are open. The temperature sensor detects whether the indoor temperature T1 has reached the set temperature T2. If the set temperature T2 is reached, the compressor 1 is turned off, the evaporator 6 is turned off, the first liquid supply solenoid valve 9 is turned off, and the direct expansion liquid supply solenoid valve 20 is turned off. If the set temperature T2 is not reached, the first liquid supply solenoid valve 9 and the direct expansion liquid supply solenoid valve 20 remain open.

[0104] As an optional implementation, after the unit enters different energy-saving cooling modes, if the unit is prone to frosting due to prolonged operation, defrosting is required. The method includes: controlling the unit to enter defrosting mode, where the evaporators to be defrosted are turned on and the evaporators that do not require defrosting are turned off. The operation mode of defrosting mode is the same as the operation mode during peak electricity price periods in the first energy-saving cooling mode; controlling the unit to turn on, and controlling all shut-off valves to open and all solenoid valves to close; if the indoor temperature has not reached the set temperature, controlling the evaporators that do not require defrosting to turn on; if the indoor temperature has reached the set temperature, maintaining the evaporators on.

[0105] After the unit enters defrost mode, the evaporators requiring defrosting are turned on, while those not requiring defrosting are turned off or in standby mode. The operation of defrost mode is the same as that during peak electricity price periods in the first energy-saving cooling mode, using refrigerant throttled through the tank pump for defrosting. At this time, all shut-off valves are opened and all solenoid valves are closed, entering defrost cold compensation mode. In this defrost cold compensation mode, it checks whether the indoor temperature has reached the set temperature. If it has not reached the set temperature, the standby or turned-off evaporators need to be restarted for cooling, tank pump 5 is turned on, the second liquid supply solenoid valve is turned on, and the evaporators in defrost maintain their original state; if the set temperature has been reached, then all evaporators only need to remain in their original state. When all evaporators have finished defrosting, tank pump 5 is turned off, all evaporators are turned on, the second liquid supply solenoid valve is turned off, and the defrost cold compensation mode is exited. The flowchart of the defrost cold compensation mode is as follows: Figure 8 As shown.

[0106] This application provides a schematic diagram of the overall process of energy-saving control for a generating unit, such as... Figure 9As shown, when the refrigeration unit is turned on, all shut-off valves are open, and the solenoid valves are closed. The indoor temperature sensor detects whether the indoor temperature T1 has reached the set temperature T2. If the set temperature T2 has not been reached, the unit enters the cooling state. The evaporator temperature sensor detects the evaporator temperature T3, and the ambient temperature sensor detects the ambient temperature T4. It is determined whether T3-T4≥△T. If T3-T4≥△T, the system enters the second energy-saving cooling mode. If T3-T4<△T, it is determined whether the system has peak-valley electricity pricing. If peak-valley electricity pricing exists, the system enters the first energy-saving cooling mode. If peak-valley electricity pricing does not exist, the system enters the normal cooling mode. If the indoor temperature T1 reaches the set temperature T2, all solenoid valves on the corresponding branches of each evaporator remain closed, the unit is in standby mode, and the system maintains the current state.

[0107] This application provides a unit energy-saving control device, such as... Figure 10 As shown, the device includes:

[0108] The acquisition module 1001 is used to acquire the indoor temperature, the evaporation temperature of the unit, and the outdoor temperature.

[0109] The first control module 1002 is used to control the unit to enter the cooling state if the indoor temperature does not reach the set temperature.

[0110] The second control module 1003 is used to control the unit to enter different energy-saving cooling modes based on the temperature difference between the evaporation temperature and the outdoor temperature, as well as the current peak or off-peak electricity price period. The different energy-saving cooling modes can be switched, and each mode requires the use of a tank pump.

[0111] Optionally, the second control module 1003 is used for:

[0112] If the temperature difference is less than the temperature difference threshold and the current electricity price is during peak or off-peak hours, then the first energy-saving cooling mode will be entered.

[0113] The first energy-saving cooling mode is used to cool the water during off-peak electricity price periods and to deliver the throttled refrigerant to the tank pump, or to use the throttled refrigerant stored in the tank pump for cooling during peak electricity price periods.

[0114] Optionally, the second control module 1003 is used for:

[0115] If the current electricity price is in a low period, the refrigerant output by the compressor is controlled to enter the expansion valve for throttling and pressure reduction. The refrigerant after throttling and pressure reduction enters the evaporator to exchange heat with the indoor air. The refrigerant output by the compressor is throttled through the tank pump liquid supply solenoid valve and the tank pump liquid supply throttling regulating valve, and the throttled refrigerant is input into the tank pump for storage.

[0116] If the indoor temperature reaches the set temperature and the refrigerant in the tank pump reaches the set liquid level, the first energy-saving cooling mode will be exited.

[0117] Optionally, the second control module 1003 is used for:

[0118] If the current electricity price is at its peak, the refrigerant discharged from the control tank pump will enter the evaporator through the second liquid supply solenoid valve, so that the refrigerant can exchange heat with the indoor air in the evaporator, and the refrigerant after heat exchange will flow back to the tank pump.

[0119] If the indoor temperature reaches the set temperature, the first energy-saving cooling mode will be exited.

[0120] If the indoor temperature does not reach the set temperature and the refrigerant in the tank pump reaches the minimum liquid level, the system will switch from the first energy-saving cooling mode to the normal cooling mode.

[0121] Optionally, the second control module 1003 is used for:

[0122] If the temperature difference between the evaporation temperature and the outdoor temperature is greater than or equal to the temperature difference threshold, the second energy-saving cooling mode will be entered.

[0123] The second energy-saving cooling mode is used when the outdoor temperature is lower than a certain temperature. The refrigerant stored in the tank pump is supplied to the terminal. The gaseous refrigerant that evaporates after phase change heat is discharged to the condenser for condensation. The refrigerant that condenses into liquid enters the tank pump to complete the heat exchange cycle.

[0124] Optionally, the second control module 1003 is used for:

[0125] The compressor is turned off, and the refrigerant flowing out of the condenser is throttled through the tank pump supply solenoid valve and the tank pump supply throttling regulating valve so that the throttled refrigerant flows into the tank pump.

[0126] The refrigerant flowing from the tank pump is controlled to enter the evaporator through the second liquid supply solenoid valve, so that the refrigerant can exchange heat with the indoor air in the evaporator;

[0127] After heat exchange, the refrigerant flows back to the condenser via a tank pump and a switching solenoid valve.

[0128] Optionally, the device is also used for:

[0129] If the current electricity price is flat, then switch to normal cooling mode;

[0130] In the normal cooling mode, if the refrigerant balance in the tank pump is greater than or equal to the preset balance, the refrigerant that has been throttled in the tank pump will be used for cooling.

[0131] When the refrigerant level in the tank pump is less than the preset level, the refrigerant output from the compressor flows into the expansion valve through the first liquid supply solenoid valve. After the throttled refrigerant exchanges heat with the indoor air in the evaporator, the refrigerant flows back to the compressor through the tank pump.

[0132] Optionally, the device is also used for:

[0133] The control unit enters defrosting mode, in which the evaporator to be defrosted is turned on and the evaporator that does not need to be defrosted is turned off. The operation mode of defrosting mode is the same as the operation mode during peak electricity price periods in the first energy-saving cooling mode.

[0134] Control the unit to start, and control all shut-off valves to open and all solenoid valves to close;

[0135] If the indoor temperature does not reach the set temperature, the evaporator that does not require defrosting will be turned on.

[0136] If the indoor temperature has reached the set temperature, the evaporator will remain on.

[0137] like Figure 11 As shown in the figure, this application provides an electronic device including a processor 1101, a communication interface 1102, a memory 1103 and a communication bus 1104, wherein the processor 1101, the communication interface 1102 and the memory 1103 communicate with each other through the communication bus 1104.

[0138] Memory 1103 is used to store computer programs.

[0139] In one embodiment of this application, the processor 1101, when executing a program stored in the memory 1103, implements the unit energy-saving control method provided in any of the foregoing method embodiments, including:

[0140] Obtain indoor temperature, unit evaporation temperature, and outdoor temperature;

[0141] If the indoor temperature does not reach the set temperature, the unit will enter cooling mode.

[0142] Based on the temperature difference between the evaporation temperature and the outdoor temperature, as well as the current peak or off-peak electricity price period, the unit is controlled to enter different energy-saving cooling modes. Switching between these different energy-saving cooling modes is possible, and each mode requires the use of a tank pump.

[0143] Optionally, based on the temperature difference between the evaporation temperature and the outdoor temperature, and the current peak or off-peak electricity price period, the unit can be controlled to enter different energy-saving cooling modes, including:

[0144] If the temperature difference is less than the temperature difference threshold and the current electricity price is during peak or off-peak hours, then the first energy-saving cooling mode will be entered.

[0145] The first energy-saving cooling mode is used to cool the water during off-peak electricity price periods and to deliver the throttled refrigerant to the tank pump, or to use the throttled refrigerant stored in the tank pump for cooling during peak electricity price periods.

[0146] Optionally, the method for implementing the first energy-saving cooling mode includes:

[0147] If the current electricity price is in a low period, the refrigerant output by the compressor is controlled to enter the expansion valve for throttling and pressure reduction. The refrigerant after throttling and pressure reduction enters the evaporator to exchange heat with the indoor air. The refrigerant output by the compressor is throttled through the tank pump liquid supply solenoid valve and the tank pump liquid supply throttling regulating valve, and the throttled refrigerant is input into the tank pump for storage.

[0148] If the indoor temperature reaches the set temperature and the refrigerant in the tank pump reaches the set liquid level, the first energy-saving cooling mode will be exited.

[0149] Optionally, the method for implementing the first energy-saving cooling mode includes:

[0150] If the current electricity price is at its peak, the refrigerant discharged from the control tank pump will enter the evaporator through the second liquid supply solenoid valve, so that the refrigerant can exchange heat with the indoor air in the evaporator, and the refrigerant after heat exchange will flow back to the tank pump.

[0151] If the indoor temperature reaches the set temperature, the first energy-saving cooling mode will be exited.

[0152] If the indoor temperature does not reach the set temperature and the refrigerant in the tank pump reaches the minimum liquid level, the system will switch from the first energy-saving cooling mode to the normal cooling mode.

[0153] Optionally, based on the temperature difference between the evaporation temperature and the outdoor temperature, and the current peak or off-peak electricity price period, the unit can be controlled to enter different energy-saving cooling modes, including:

[0154] If the temperature difference between the evaporation temperature and the outdoor temperature is greater than or equal to the temperature difference threshold, the second energy-saving cooling mode will be entered.

[0155] The second energy-saving cooling mode is used when the outdoor temperature is lower than a certain temperature. The refrigerant stored in the tank pump is supplied to the terminal. The gaseous refrigerant that evaporates after phase change heat is discharged to the condenser for condensation. The refrigerant that condenses into liquid enters the tank pump to complete the heat exchange cycle.

[0156] Optionally, the method for implementing the second energy-saving cooling mode includes:

[0157] The compressor is turned off, and the refrigerant flowing out of the condenser is throttled through the tank pump supply solenoid valve and the tank pump supply throttling regulating valve so that the throttled refrigerant flows into the tank pump.

[0158] The refrigerant flowing from the tank pump is controlled to enter the evaporator through the second liquid supply solenoid valve, so that the refrigerant can exchange heat with the indoor air in the evaporator;

[0159] After heat exchange, the refrigerant flows back to the condenser via a tank pump and a switching solenoid valve.

[0160] Optionally, after determining that the temperature difference is less than a temperature difference threshold, the method further includes:

[0161] If the current electricity price is flat, then switch to normal cooling mode;

[0162] In the normal cooling mode, if the refrigerant balance in the tank pump is greater than or equal to the preset balance, the refrigerant that has been throttled in the tank pump will be used for cooling.

[0163] When the refrigerant level in the tank pump is less than the preset level, the refrigerant output from the compressor flows into the expansion valve through the first liquid supply solenoid valve. After the throttled refrigerant exchanges heat with the indoor air in the evaporator, the refrigerant flows back to the compressor through the tank pump.

[0164] Optionally, after the control unit enters different energy-saving cooling modes, the method also includes:

[0165] The control unit enters defrosting mode, in which the evaporator to be defrosted is turned on and the evaporator that does not need to be defrosted is turned off. The operation mode of defrosting mode is the same as the operation mode during peak electricity price periods in the first energy-saving cooling mode.

[0166] Control the unit to start, and control all shut-off valves to open and all solenoid valves to close;

[0167] If the indoor temperature does not reach the set temperature, the evaporator that does not require defrosting will be turned on.

[0168] If the indoor temperature has reached the set temperature, the evaporator will remain on.

[0169] This application also provides a computer-readable storage medium storing a computer program thereon, which, when executed by a processor, implements the steps of the unit energy-saving control method provided in any of the foregoing method embodiments.

[0170] The device embodiments described above are merely illustrative. The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the modules can be selected to achieve the purpose of this embodiment according to actual needs.

[0171] Through the above description of the embodiments, those skilled in the art can clearly understand that each embodiment can be implemented using software plus a general-purpose hardware platform, or of course, using hardware. Based on this understanding, the above technical solutions, in essence or the parts that contribute to the related technology, can be embodied in the form of a software product. This computer software product can be stored in a computer-readable storage medium, such as ROM / RAM, magnetic disk, optical disk, etc., and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute the methods described in the various embodiments or some parts of the embodiments.

[0172] It should be understood that the terminology used herein is for the purpose of describing particular exemplary embodiments only and is not intended to be limiting. Unless the context clearly indicates otherwise, the singular forms “a,” “an,” and “described” as used herein may also include the plural forms. The terms “comprising,” “including,” “containing,” and “having” are inclusive and therefore indicate the presence of the stated features, steps, operations, elements, and / or components, but do not exclude the presence or addition of one or more other features, steps, operations, elements, components, and / or combinations thereof. The method steps, processes, and operations described herein are not construed as requiring them to be performed in a particular order described or illustrated unless the order of performance is explicitly indicated. It should also be understood that additional or alternative steps may be used.

[0173] The above description is merely a specific embodiment of the present invention, enabling those skilled in the art to understand or implement the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the present invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features claimed herein.

Claims

1. A unit energy-saving control method applied to a unit energy-saving control system, characterized in that, The unit's energy-saving control system includes a return gas pipe, a liquid supply pipe, an oil separator, a condenser, a compressor, a tank pump, a switching solenoid valve, a switching shut-off valve four, a switching shut-off valve three, and a direct expansion liquid supply solenoid valve. The tank pump is connected to both the return gas pipe and the liquid supply pipe, and is used to store refrigerant. A switching solenoid valve and a switching shut-off valve four are installed on the pipe between the condenser and the compressor. A switching shut-off valve three is installed between the oil separator and the condenser. The direct expansion liquid supply solenoid valve is installed on the liquid supply pipe. The switching solenoid valve, the switching shut-off valve four, the switching shut-off valve three, and the direct expansion liquid supply solenoid valve are used to switch between different cooling modes. The system further includes a tank pump supply shut-off valve, a tank pump supply solenoid valve, a tank pump supply throttling valve, a second supply solenoid valve, and a supply regulating valve; the tank pump is connected to the return gas pipe through a first outlet, the tank pump is connected to the supply pipe through a first inlet at a first interface, the direct expansion supply solenoid valve is provided between the first interface and the supply shut-off valve, the tank pump is connected to the supply pipe through a second outlet at a second interface, the second interface is provided between the direct expansion supply solenoid valve and the supply shut-off valve, the tank pump is connected to the outlet of the evaporator through a second inlet, the tank pump supply shut-off valve, the tank pump supply solenoid valve, and the tank pump supply throttling valve are provided between the first inlet and the first interface, and the second supply solenoid valve and the supply regulating valve are provided between the inlet of the evaporator and the dryer filter; The method includes: Obtain indoor temperature, unit evaporation temperature, and outdoor temperature; If the indoor temperature does not reach the set temperature, the unit will be controlled to enter the cooling state. Based on the temperature difference between the evaporation temperature and the outdoor temperature, as well as the current peak and off-peak electricity price periods, the unit is controlled to enter different energy-saving cooling modes. The different energy-saving cooling modes can be switched, and each energy-saving cooling mode requires the use of a tank pump. The different energy-saving cooling modes include a first energy-saving cooling mode, a second energy-saving cooling mode, and a normal cooling mode. The first energy-saving cooling mode is used for cooling during off-peak electricity prices and for delivering throttled refrigerant to a tank pump for storage, or for cooling using throttled refrigerant in the tank pump during peak electricity prices. The second energy-saving cooling mode is used for heat exchange circulation between the refrigerant stored in the tank pump and a natural cold source when the outdoor temperature is below a certain temperature. The normal cooling mode is used for selecting the refrigerant in the tank pump or the refrigerant output from the compressor as the cold source for cooling based on the remaining refrigerant in the tank pump.

2. The method according to claim 1, characterized in that, Based on the temperature difference between the evaporation temperature and the outdoor temperature, and the current peak or off-peak electricity price period, the unit is controlled to enter different energy-saving cooling modes, including: If the temperature difference is less than the temperature difference threshold and the current electricity price is in peak or off-peak period, then the first energy-saving cooling mode is entered. The first energy-saving cooling mode is used to cool the air during off-peak electricity price periods and deliver the throttled refrigerant to the tank pump, or to cool the air using the throttled refrigerant stored in the tank pump during peak electricity price periods.

3. The method according to claim 2, characterized in that, The method for executing the first energy-saving cooling mode includes: If the current electricity price is in a low period, the refrigerant output from the compressor is controlled to enter the expansion valve for throttling and pressure reduction. The refrigerant after throttling and pressure reduction enters the evaporator to exchange heat with the indoor air. The refrigerant output from the compressor is throttled through the tank pump liquid supply solenoid valve and the tank pump liquid supply throttling regulating valve, and the throttled refrigerant is input into the tank pump for storage. If the indoor temperature reaches the set temperature and the refrigerant in the tank pump reaches the set liquid level, then exit the first energy-saving cooling mode.

4. The method according to claim 2, characterized in that, The method for executing the first energy-saving cooling mode includes: If the current electricity price is at its peak, the refrigerant discharged from the control tank pump will enter the evaporator through the second liquid supply solenoid valve, so that the refrigerant can exchange heat with the indoor air in the evaporator, and the refrigerant after heat exchange will flow back to the tank pump. If the indoor temperature reaches the set temperature, the first energy-saving cooling mode will be exited. If the indoor temperature does not reach the set temperature and the refrigerant in the tank pump reaches the minimum liquid level, the system will switch from the first energy-saving cooling mode to the normal cooling mode.

5. The method according to claim 1, characterized in that, Based on the temperature difference between the evaporation temperature and the outdoor temperature, and the current peak or off-peak electricity price period, the unit is controlled to enter different energy-saving cooling modes, including: If the temperature difference between the evaporation temperature and the outdoor temperature is greater than or equal to the temperature difference threshold, then the second energy-saving cooling mode is entered. In the second energy-saving cooling mode, when the outdoor temperature is lower than a certain temperature, the refrigerant stored in the tank pump is supplied to the terminal. The gaseous refrigerant that evaporates after phase change heat is discharged to the condenser for condensation. The refrigerant that condenses into liquid enters the tank pump to complete the heat exchange cycle.

6. The method according to claim 5, characterized in that, The execution method of the second energy-saving cooling mode includes: The compressor is turned off, and the refrigerant flowing out of the condenser is throttled through the tank pump supply solenoid valve and the tank pump supply throttling regulating valve so that the throttled refrigerant flows into the tank pump. The refrigerant flowing from the tank pump is controlled to enter the evaporator through the second liquid supply solenoid valve, so that the refrigerant can exchange heat with the indoor air in the evaporator. After heat exchange, the refrigerant flows back to the condenser via the tank pump and the switching solenoid valve.

7. The method according to claim 2, characterized in that, After determining that the temperature difference is less than a temperature difference threshold, the method further includes: If the current electricity price is flat, then switch to normal cooling mode; In the normal cooling mode, if the refrigerant balance in the tank pump is greater than or equal to the preset balance, the refrigerant that has been throttled in the tank pump is used for cooling. When the refrigerant balance in the tank pump is less than the preset balance, the refrigerant output by the compressor is controlled to flow into the expansion valve through the first liquid supply solenoid valve. After the throttled refrigerant exchanges heat with the indoor air in the evaporator, the refrigerant is controlled to flow back to the compressor through the tank pump.

8. The method according to claim 1, characterized in that, After the control unit enters different energy-saving cooling modes, the method further includes: The unit is controlled to enter defrost mode, wherein the evaporator to be defrosted is turned on and the evaporator that does not need to be defrosted is turned off. The operation mode of defrost mode is the same as the operation mode during peak electricity price period in the first energy-saving cooling mode. Control the unit to start, and control all shut-off valves to open and all solenoid valves to close; If the indoor temperature does not reach the set temperature, the evaporator that does not require defrosting will be turned on. If the indoor temperature has reached the set temperature, the evaporator will remain on.

9. A unit energy-saving control device, used to implement the unit energy-saving control method as described in any one of claims 1 to 8, characterized in that, The device includes: The acquisition module is used to acquire indoor temperature, unit evaporation temperature, and outdoor temperature. The first control module is used to control the unit to enter the cooling state if the indoor temperature does not reach the set temperature. The second control module is used to control the unit to enter different energy-saving cooling modes based on the temperature difference between the evaporation temperature and the outdoor temperature, as well as the current peak and off-peak electricity price periods. The different energy-saving cooling modes can be switched, and each energy-saving cooling mode requires the use of a tank pump.

10. An electronic device, characterized in that, It includes a processor, a communication interface, a memory, and a communication bus, wherein the processor, the communication interface, and the memory communicate with each other through the communication bus; Memory, used to store computer programs; A processor, when executing a program stored in memory, implements the method described in any one of claims 1-8.

11. A computer-readable storage medium, characterized in that, The computer-readable storage medium stores a computer program that, when executed by a processor, implements the method described in any one of claims 1-8.

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