Cold storage air conditioning system, control method, air conditioner and storage medium

Abstract

The present invention discloses a cold storage air conditioning system, a control method, an air conditioner and a storage medium. The control method includes: determining whether there is a refrigeration demand and a cold storage demand; if there is only a cold storage demand, then according to the cold storage medium temperature T 介质 Dynamically calculate the target evaporation temperature Tb of the cold storage device, and adjust the cold storage device according to Tb; and / or if there is a cooling demand and a cold storage demand at the same time, adjust the target evaporation temperature Tb according to the cold storage medium temperature Tb of the cold storage device. 介质 The target evaporation temperature Tb of the cold storage device is dynamically calculated. The target evaporation temperature Ta of the indoor heat exchanger is compared with the target evaporation temperature Tb. The indoor heat exchanger is adjusted according to Ta, and the cold storage device is adjusted according to the lower of Ta and Tb. This invention rationally calculates and selects the target evaporation temperature of the cold storage device, achieving efficient cold storage and / or efficient refrigeration and cold storage.

Description

Technical Field

[0001] The present invention relates to the technical field of cold storage air conditioning, and in particular to a cold storage air conditioning system, a control method, an air conditioner and a storage medium. Background Art

[0002] Cold storage air conditioning systems typically include refrigeration equipment and a cold storage device. The refrigeration equipment utilizes low-energy nighttime electricity to cool the air conditioning system, storing the cold energy in the form of sensible heat or latent heat of phase change. During peak load periods, the stored cold energy is partially or fully utilized to supply cooling to the air conditioning system, thereby reducing the installed capacity of the refrigeration equipment, lowering operating costs, and shifting the peak and valley of electricity load. Cold storage solutions currently available in the art typically operate the cold storage device at a fixed target evaporation temperature, which is lower than the phase change temperature of the cold storage medium, during the cold storage period. This solution suffers from the fact that during the initial cold storage period, when the cold storage medium temperature is high, the temperature difference between the cold storage medium and the refrigerant is significant, significantly increasing the power consumption of the compressor. Furthermore, the low-temperature refrigerant evaporates in the cold storage device, producing a large amount of gaseous refrigerant. This gaseous refrigerant, upon entering the compressor, causes the exhaust temperature to drop significantly, which can easily cause system failures.

[0003] In addition, the cold storage air-conditioning systems in the prior art are of various forms. Taking an ice storage air-conditioning system with dual evaporators as an example, a three-way valve and an ejector are used to connect the ice storage device to the air-conditioning system. When operating the air-conditioning + ice-making mode, ice storage is started while maintaining a constant indoor temperature until the ice storage is completed. That is, the air-conditioning system can achieve cooling and cold storage at the same time. However, for the purpose of comfort, the indoor heat exchanger needs to maintain an evaporation temperature of about 13°C, while the cold storage device needs to maintain an evaporation temperature below 0°C for ice making. The difference between the two is large, but the three-way valve alone cannot ensure the reasonable distribution of the refrigerant in the two evaporators, making it difficult to achieve efficient cooling and cold storage. Summary of the Invention

[0004] In order to solve the defect of low cold storage efficiency of existing cold storage air conditioning systems, the present invention proposes a cold storage air conditioning system, a control method, an air conditioner and a storage medium, which achieve the effect of efficient cold storage and / or efficient refrigeration cold storage by reasonably calculating and selecting the target evaporation temperature of the cold storage device.

[0005] The technical solution adopted by the present invention is to design a control method for a cold storage air conditioning system, comprising:

[0006] Determine whether there is a demand for cooling and cold storage;

[0007] If there is only a need for cold storage, then according to the temperature T of the cold storage medium of the cold storage device 介质 Dynamically calculate the target evaporation temperature Tb of the cold storage device, and adjust the cold storage device according to Tb;

[0008] And / or if there is a cooling demand and a cold storage demand at the same time, then according to the cold storage medium temperature T介质 Dynamically calculate the target evaporation temperature Tb of the cold storage device, compare the target evaporation temperature Ta of the indoor heat exchange device with the target evaporation temperature Tb, adjust the indoor heat exchange device according to Ta, and adjust the cold storage device according to the lower one of Ta and Tb.

[0009] In some embodiments, the target evaporation temperature Tb is calculated by detecting the temperature of the cold storage medium T in the cold storage device. 介质 , according to the temperature of the cold storage medium T 介质 Obtain the corresponding target evaporation temperature Tb from the pre-established first calculation model; wherein the first calculation model only uses the cold storage medium temperature T 介质 As an input variable, the output variable of the first calculation model is the target evaporation temperature Tb.

[0010] Furthermore, the first calculation model includes a plurality of different medium temperature intervals, each medium temperature interval is configured with an adjustment temperature, Tb=T 介质 -Bx, Bx is T 介质 The adjustment temperature of the medium temperature range. The lower the medium temperature range, the higher the adjustment temperature.

[0011] In some embodiments, the target evaporation temperature Tb is calculated by detecting the temperature of the cold storage medium T in the cold storage device. 介质 and ambient temperature T 环 , according to the temperature of the cold storage medium T 介质 and ambient temperature T 环 The corresponding target evaporation temperature Tb is obtained from the pre-established second calculation model; wherein the second calculation model is based on the temperature of the cold storage medium T 介质 and ambient temperature T 环 As an input variable, the output variable of the first calculation model is the target evaporation temperature Tb.

[0012] Furthermore, the second calculation model includes multiple sets of different temperature intervals, each set of temperature intervals includes a medium temperature interval and an ambient temperature interval, and each set of temperature intervals is configured with an adjustment temperature, Tb=T 介质 -Bx, Bx is T 介质 and T 环 The adjusted temperature of the temperature range set. In the temperature range set with the same medium temperature range, the lower the ambient temperature range, the higher the adjusted temperature. In the temperature range set with the same ambient temperature range, the lower the medium temperature range, the higher the adjusted temperature.

[0013] Furthermore, when there is a cooling demand and a cold storage demand at the same time, and Ta≤Tb, the cold storage device is connected in parallel with the indoor heat exchange device, and both the indoor heat exchange device and the cold storage device are adjusted according to Ta; when there is a cooling demand and a cold storage demand at the same time, and Ta>Tb, an adjustment tank for providing liquid refrigerant to the cold storage device is connected in series between the indoor heat exchange device and the cold storage device, and the indoor heat exchange device is located upstream of the adjustment tank, the indoor heat exchange device is adjusted according to Ta, and the cold storage device is adjusted according to Tb.

[0014] Furthermore, the control method also includes: if there is only a cold storage demand, then only the cold storage device among the indoor heat exchange device and the cold storage device participates in the refrigeration cycle; and / or if there is only a cooling demand, then only the indoor heat exchange device among the indoor heat exchange device and the cold storage device participates in the refrigeration cycle.

[0015] The present invention also proposes a cold storage air-conditioning system, comprising: a main circulation loop and a cold storage device that can be connected to the main circulation loop, the main circulation loop includes a compressor, an outdoor heat exchanger, and an indoor heat exchange device connected in sequence; the controller of the cold storage air-conditioning system executes the above-mentioned control method.

[0016] Furthermore, the cold storage air-conditioning system also includes: an adjustment tank with a gas-liquid separation function, the cold storage device can be connected in parallel or in series with the indoor heat exchange device, and the adjustment tank participates in the refrigerant circulation when the cold storage device is connected in series with the indoor heat exchange device for cold storage, and is used to provide liquid refrigerant to the cold storage device.

[0017] Furthermore, the indoor heat exchange device includes an indoor heat exchanger and an indoor throttle valve provided on the refrigeration inlet side of the indoor heat exchanger, and the indoor heat exchange device is installed on the indoor pipeline located in the main circulation loop; the cold storage device includes a cold storage device and a cold storage throttle valve provided on the cold storage inlet side of the cold storage device, and the cold storage device is installed on the cold storage pipeline connected in parallel with the indoor pipeline; the adjustment tank is installed on the adjustment pipeline connected in series between the refrigeration outlet side of the indoor heat exchanger and the cold storage throttle valve; wherein, the inlet and outlet branches of each pipeline are provided with a control valve for adjusting the on-off state to switch the operating mode of the cold storage air-conditioning system.

[0018] Furthermore, the operation mode of the cold storage air conditioning system includes at least one of a conventional air conditioning mode, a cold storage mode alone, a first cooling and cold storage mode, and a second cooling and cold storage mode;

[0019] When the cold storage air conditioning system is in the conventional air conditioning mode, the inlet and outlet branches of the cold storage pipeline and the inlet and outlet branches of the adjustment pipeline are both shut off, and only the indoor heat exchange device participates in the refrigerant circulation of the main circulation loop;

[0020] and / or when the cold storage air conditioning system is in a separate cold storage mode, the inlet and outlet branches of the indoor pipeline and the inlet and outlet branches of the adjustment pipeline are both shut off, and only the cold storage device participates in the refrigeration cycle of the main circulation loop;

[0021] and / or when the cold storage air conditioning system is in the first cooling and cold storage mode, the inlet and outlet branches of the adjustment pipeline are shut off, and the cold storage device and the indoor heat exchange device are connected in parallel to participate in the refrigeration cycle of the main circulation loop;

[0022] And / or when the cold storage air-conditioning system is in the second cooling and cold storage mode, the inlet and outlet branches of the adjustment pipeline are closed, and the indoor heat exchange device, the adjustment tank and the cold storage device are connected in series in sequence to participate in the refrigeration cycle of the main circulation loop, and the indoor heat exchange device is located upstream of the adjustment tank.

[0023] Further, Main circulation loop It also includes a four-way valve for switching the flow direction of the refrigerant. The four ports of the four-way valve are respectively connected to the exhaust side of the compressor, the suction side of the compressor, the cooling inlet side of the outdoor heat exchanger, and the cooling outlet side of the indoor heat exchanger;

[0024] Conventional air conditioning mode includes separate cooling mode and separate heating mode;

[0025] When the cold storage air conditioning system is in the independent cooling mode, the indoor heat exchange device participates in the refrigeration cycle of the main circulation loop;

[0026] When the cold storage air conditioning system is in the single heating mode, the indoor heat exchange device participates in the heating cycle of the main circulation loop.

[0027] Furthermore, a cold release pipeline with an adjustable on-off state is connected between the cold storage device and the indoor heat exchanger. The cold release pipeline includes a cold release inlet branch and a cold release outlet branch. One end of the cold release inlet branch is connected to the cold storage inlet side of the cold storage throttle valve, and the other end is connected to the cold storage outlet side of the cold storage device. One end of the cold release outlet branch is connected to the cold storage outlet side of the cold storage throttle valve, and the other end is connected to the refrigeration inlet side of the indoor throttle valve.

[0028] In some embodiments, the cold release inlet branch is installed with a control valve for adjusting the on-off state, and the cold release outlet branch is installed with a one-way valve, which only allows the refrigerant to flow to the refrigeration inlet side of the indoor throttle valve.

[0029] Furthermore, the operating mode of the cold storage air-conditioning system also includes a cold release mode; when the cold storage air-conditioning system is in the cold release mode, the inlet and outlet branches of the adjustment pipeline are closed, the cold storage device and the indoor heat exchange device are connected in series to participate in the refrigeration cycle of the main circulation loop, and the cold storage device is located upstream of the indoor heat exchange device.

[0030] Furthermore, the compressor has an air supply port, and the air outlet of the adjustment tank is connected to the air supply port through a first air supply outlet branch.

[0031] Further, Main circulation loop It also includes a gas-liquid separator, which is connected between the refrigeration outlet side of the indoor heat exchange device and the suction side of the compressor. The air outlet of the adjustment tank is connected to the inlet of the gas-liquid separator through a second air supply outlet branch, and the second air supply outlet branch is equipped with an air supply throttle valve.

[0032] The present invention also provides an air conditioner, which adopts the above-mentioned cold storage air conditioning system.

[0033] The present invention also provides a storage medium, which is used to store a computer program. When the computer program is running, the control method is executed.

[0034] Compared with the prior art, the present invention has the following beneficial effects:

[0035] 1. When there is a need for cold storage, calculate and select the target evaporation temperature of the cold storage device to achieve efficient cooling and / or cold storage;

[0036] 2. According to the target evaporation temperature of the cold storage device, switch to the corresponding cold storage state to ensure smooth and stable operation of the cold storage air conditioning system;

[0037] 3. Ability to achieve two different evaporation temperatures in the indoor heat exchanger and cold storage to meet the needs of both cooling and cold storage;

[0038] 4. The cold storage air conditioning system has different operating modes and can be flexibly switched according to actual usage needs. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] The present invention is described in detail below with reference to the embodiments and accompanying drawings, in which:

[0040] Figure 1 Schematic diagram of the connection of the cold storage air conditioning system of the present invention;

[0041] Figure 2 It is a schematic flow chart of the control method of the present invention;

[0042] Figure 3 Schematic diagram of the refrigerant flow in the single refrigeration mode of the present invention;

[0043] Figure 4 Schematic diagram of the refrigerant flow in the single cold storage mode of the present invention;

[0044] Figure 5 Schematic diagram of the refrigerant flow in the first cooling and cold storage mode of the present invention;

[0045] Figure 6 Schematic diagram of the refrigerant flow in the second cooling and cold storage mode of the present invention;

[0046] Figure 7 Schematic diagram of the refrigerant flow direction in the cooling mode of the present invention;

[0047] Figure 8 Schematic diagram of the refrigerant flow in the heating mode of the present invention;

[0048] Explanation of the accompanying symbols: 1. compressor; 2. four-way valve; 3. outdoor heat exchanger; 4. outdoor throttle valve; 5. subcooling throttle valve; 6. subcooler; 7. air supply throttle valve; 8. gas-liquid separator; 9. subcooling control valve; 10. first indoor control valve; 11. first cold storage control valve; 12. cold release control valve; 13. second cold storage control valve; 14. cold storage throttle valve; 15. cold storage; 16. second adjusting control valve; 17. one-way valve; 18. indoor throttle valve; 19. indoor heat exchanger; 20. first adjusting control valve; 21. adjustment tank; 22. second indoor control valve. DETAILED DESCRIPTION

[0049] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0050] like Figure 1 As shown, the control method proposed in the present invention is applicable to a cold storage air-conditioning system, which has a main circulation loop and a cold storage device that can be connected to the main circulation loop. The main circulation loop includes a compressor 1, an outdoor heat exchanger 3 and an indoor heat exchange device connected in sequence. The indoor heat exchange device usually includes an indoor heat exchanger 19 and an indoor throttle valve 18. The indoor throttle valve 18 is installed on the refrigeration inlet side of the indoor heat exchanger 19. The cold storage device usually includes a cold storage device 15 and a cold storage throttle valve 14. The cold storage throttle valve 14 is installed on the cold storage inlet side of the cold storage device 15. The cold storage device can store cold alone or store cold while the indoor heat exchange device is cooling. The control method is to achieve efficient cooling and / or cold storage by reasonably calculating and setting the target evaporation temperature of the cold storage device when there is a demand for cold storage.

[0051] like Figure 2 As shown, the logic of the control method is as follows:

[0052] Determine whether there is a demand for cooling and cold storage;

[0053] If there is only a need for cold storage, then according to the temperature T of the cold storage medium of the cold storage device 介质 Dynamically calculate the target evaporation temperature Tb of the cold storage device, and adjust the cold storage device according to Tb to achieve efficient cold storage;

[0054] If there is a demand for cooling and cold storage at the same time, the temperature of the cold storage medium T 介质Dynamically calculate the target evaporation temperature Tb of the cold storage device, compare the target evaporation temperature Ta of the indoor heat exchange device with the target evaporation temperature Tb, and adjust the indoor heat exchange device according to Ta to ensure that the indoor temperature meets user needs. The cold storage device is adjusted according to the lower of Ta and Tb to achieve efficient cold storage.

[0055] It should be pointed out that the target evaporation temperature mentioned above is the saturation temperature obtained by converting the evaporation pressure. The target evaporation pressure can also be obtained by reverse deduction based on the target evaporation temperature. After determining the target evaporation temperature, the system will adjust the operating frequency of the compressor according to the corresponding target evaporation temperature, and the relevant throttle valve will also be adjusted due to changes in the target evaporation temperature. The focus of the present invention is to reasonably select the target evaporation temperature, and there is no special restriction on the specific adjustment logic. In addition, the target evaporation temperature Ta is determined based on the target indoor temperature. The evaporation temperature is usually required to be 5 to 10°C lower than the target indoor temperature. The present invention does not impose any special restrictions on the calculation method of the target evaporation temperature Ta.

[0056] There are many ways to calculate the target evaporation temperature Tb. The following only uses two calculation methods as examples.

[0057] In the first calculation method, the temperature of the cold storage medium in the cold storage device is detected. 介质 , according to the temperature of the cold storage medium T 介质 The corresponding target evaporation temperature Tb is obtained from the pre-established first calculation model, which only uses the temperature T of the cold storage medium. 介质 As the input variable, the output variable of the first calculation model is the target evaporation temperature Tb. The specific form of the first calculation model is not particularly limited. It can be a function calculation model obtained through experimental data fitting analysis or a control relationship model obtained through experimental data statistical analysis. Taking the control relationship model as an example, the first calculation model includes multiple different medium temperature intervals, each medium temperature interval is configured with an adjustment temperature, Tb = T 介质 -Bx, Bx is T 介质 The adjustment temperature of the medium temperature range. The lower the medium temperature range, the higher the adjustment temperature.

[0058] According to the statistical results of experimental data, when the temperature of the cold storage medium T 介质 Set the target evaporation temperature T of the cold storage device b When the temperature is 10 ... n , B0≤B1≤…≤B n .

[0059] <![CDATA[T 介质 ]]> <![CDATA[>A1]]> <![CDATA[(A2,A1]]]> <![CDATA[(A3,A2]]]> … <![CDATA[≤A n ]]> <![CDATA[T b ]]> <![CDATA[T 介质 -B0]]> <![CDATA[T 介质 -B1]]> <h2 style=";text-align:left;direction:ltr"><![CDATA[T <h2 style=";text-align:left;direction:ltr"> 介质 <h2 style=";text-align:left;direction:ltr"> -B2]]><h2 style=";text-align:left;direction:ltr"> … <![CDATA[T 介质 -B n ]]>

[0060] The design principle of the above temperature adjustment is that the lower the water temperature, the lower the temperature of the refrigerant in the refrigerant pipe of the cold storage device needs to be in order to achieve heat exchange and cold storage. At the same time, as the temperature of the cold storage medium decreases, the heat exchange capacity of the cold storage medium will decrease. Therefore, the refrigerant temperature must not only be lower than the cold storage medium temperature, but the heat exchange temperature difference between the two must be further increased to maintain a good heat exchange efficiency. Therefore, B0≤B1≤…≤B n Adjusting the refrigerant temperature in stages can effectively reduce the power consumption of the compressor and ensure safe operation of the system on the basis of good heat exchange efficiency.

[0061] In some feasible embodiments of the present invention, the cold storage medium is water, that is, T 介质 T 水 , the division of medium temperature range and the setting of adjustment temperature are as follows:

[0062] <![CDATA[T 水 ]]> ＞20℃ (10℃,20℃] (0℃,10℃] ≤0℃ <![CDATA[T b ]]> <![CDATA[T 水 -8℃]]> <![CDATA[T 水 -10℃]]> <![CDATA[T 水 -12℃]]> <![CDATA[T 水 -15℃]]>

[0063] In the second calculation method, the temperature of the cold storage medium in the cold storage device is detected. 介质 and ambient temperature T 环 , according to the temperature of the cold storage medium T 介质 and ambient temperature T 环 The corresponding target evaporation temperature Tb is obtained from the pre-established second calculation model, which is based on the temperature T of the cold storage medium. 介质 and ambient temperature T 环 As the input variable, the output variable of the first calculation model is the target evaporation temperature Tb. The specific form of the second calculation model is not particularly limited. It can be a function calculation model obtained through experimental data fitting analysis or a control relationship model obtained through experimental data statistical analysis. Taking the control relationship model as an example, the second calculation model includes multiple sets of different temperature intervals, each set of temperature intervals includes a medium temperature interval and an ambient temperature interval, and each set of temperature intervals is configured with an adjustment temperature, Tb=T 介质 -Bx, Bx is T 介质 and T 环 The adjusted temperature of the temperature range set. In the temperature range set with the same medium temperature range, the lower the ambient temperature range, the higher the adjusted temperature. In the temperature range set with the same ambient temperature range, the lower the medium temperature range, the higher the adjusted temperature.

[0064] According to the statistical results of experimental data, when the temperature of the cold storage medium T 介质 and ambient temperature T 环 Set the target evaporation temperature T of the cold storage device b When the temperature is 10 ... n, C1>C2>…>C m , B i0 ≤B i1 ≤…≤B in (i=0~m),B 0j ≤B 1j ≤…≤B mj (j=0~n).

[0065]

[0066] It should be understood that the cold storage medium includes but is not limited to phase change cold storage materials such as water and ice. For the first calculation method and the second calculation method, the target evaporation temperature Tb is determined by the cold storage medium temperature T 介质 and ambient temperature T 环 The accuracy of the common setting is higher and the cooling effect is better. The reason is that when the ambient temperature is too high, if the target evaporation temperature is set too low, the power consumption of the compressor will increase. Therefore, the target evaporation temperature Tb should be set according to the ambient temperature T 环 Make appropriate adjustments to improve the performance of the cold storage air conditioning system.

[0067] like Figure 1 、 2 As shown, in some embodiments of the present invention, when there is both a cooling demand and a cold storage demand, after determining the target evaporation temperature Tb of the cold storage device, the cold storage device should also be switched to the corresponding cold storage state. The specific control process is as follows:

[0068] If there is only cooling demand and no cold storage demand, then only the indoor heat exchanger and the cold storage device will participate in the refrigeration cycle of the main circulation loop, that is, the cold storage air-conditioning system operates in a separate cooling mode, and the indoor heat exchanger is adjusted according to Ta;

[0069] If there is only a need for cold storage, then only the cold storage device among the indoor heat exchange device and the cold storage device participates in the refrigeration cycle of the main circulation loop, that is, the cold storage air-conditioning system operates in a separate cold storage mode, and the cold storage device is adjusted according to Tb;

[0070] If there is a demand for cooling and cold storage, according to the temperature T of the cold storage medium of the cold storage device, 介质 Dynamic calculation of the target evaporation temperature Tb of the cold storage device changes with the temperature of the cold storage medium. Therefore, it is necessary to compare the target evaporation temperature Ta of the indoor heat exchanger 19 and the target evaporation temperature Tb of the cold storage medium 15 in real time to change the cold storage state. a ≤ target evaporation temperature T of cold storage device b , the cold storage air conditioning system operates in the first cooling and cold storage mode. At this time, the indoor heat exchanger and the cold storage are connected in parallel, and both are adjusted according to the target evaporation temperature Ta. The reason is that Ta ≤T b In the parallel state, the system cannot achieve the evaporation temperature of the cold storage device 15 to be higher than the evaporation temperature of the indoor heat exchanger 19. In order to ensure that the user's cooling needs are met and the cold storage device 15 can still store cold normally when the evaporation temperature is low, the two devices are operated at the same target evaporation temperature Ta. As the cold storage process proceeds, the target evaporation temperature Tb of the cold storage device 15 changes with the temperature of the cold storage medium T 介质 Gradually decreases, if the target evaporation temperature T of the indoor heat exchanger a > Target evaporation temperature T of cold storage device b , the cold storage air-conditioning system operates in the second cooling and cold storage mode. At this time, the indoor heat exchanger 19 is arranged in series upstream of the cold storage 15. The refrigerant between the indoor heat exchanger 19 and the cold storage 15 is transferred through the adjustment tank 21. The adjustment tank 21 provides liquid refrigerant to the cold storage 15, and two different evaporation temperatures are achieved in the indoor heat exchanger 19 and the cold storage 15. After the refrigerant evaporates in the indoor heat exchanger 19, it enters the adjustment tank 21 to separate the gas and liquid components. The liquid refrigerant in the adjustment tank 21 enters the cold storage 15 for secondary evaporation. At this time, the indoor heat exchanger 19 operates according to the target evaporation temperature Ta, and the cold storage 15 operates according to the target evaporation temperature Tb. At this time, both the indoor cooling demand and the cold storage capacity demand of the cold storage 15 can be met.

[0071] It should be noted that the cold storage demand is usually based on the cold storage medium temperature T 介质 If the temperature of the cold storage medium T 介质 ≥ set limit temperature, it is determined that there is a need for cold storage. If the cold storage medium temperature T 介质 If the temperature is less than the set limit, it is determined that there is no cold storage demand. Taking water as the cold storage medium, when the water temperature is ≥0℃, it is determined that there is a cold storage demand, and when the water temperature is less than 0℃, it is determined that there is no cold storage demand.

[0072] like Figure 1 As shown, in some embodiments of the present invention, the cold storage air-conditioning system includes a main circulation loop, a cold storage device and an adjustment tank. The cold storage device can be connected in parallel or in series with the indoor heat exchange device. The adjustment tank 21 has a gas-liquid separation function. The adjustment tank 21 is provided with an inlet, a liquid outlet and an air outlet. The pipelines where the inlet and the liquid outlet are located extend to the bottom of the adjustment tank 21, so that the inlet and the liquid outlet are located at the bottom of the adjustment tank 21, and the air outlet is located at the upper part of the adjustment tank 21, so as to ensure that the liquid outlet sends out liquid refrigerant and the air outlet sends out gaseous refrigerant.

[0073] When the cold storage device and the indoor heat exchange device are connected in parallel for cold storage, the adjustment tank 21 is disconnected from the cold storage device and the indoor heat exchange device, and a part of the refrigerant flowing out of the outdoor heat exchanger 3 enters the cold storage device, and the other part of the refrigerant enters the indoor heat exchange device; when the cold storage device and the indoor heat exchange device are connected in series for cold storage, the adjustment tank 21 is connected between the cold storage device and the indoor heat exchange device, specifically, it receives the refrigerant output by the indoor heat exchange device and provides liquid refrigerant to the cold storage device, thereby realizing two different evaporation temperatures in the indoor heat exchanger 19 and the cold storage device 15 to meet efficient operation when there are both refrigeration needs and cold storage needs.

[0074] The main circulation loop has outdoor pipelines and indoor pipelines. The outdoor pipelines usually refer to the pipelines where the compressor 1 and the outdoor heat exchanger 3 are located. The indoor pipelines usually refer to the pipelines where the indoor heat exchange device is located. The indoor pipelines are connected between the refrigeration outlet side of the outdoor heat exchanger 3 and the suction side of the compressor 1. The connection relationship between the cold storage device, the adjustment tank 21 and the indoor heat exchange device is switched through the pipeline. The pipeline structure can be designed according to actual needs, and the series and parallel connections of the cold storage device and the indoor heat exchange device can be adjusted.

[0075] Taking a feasible solution provided by the present invention as an example, the cold storage device is installed on the cold storage pipeline, and the cold storage pipeline is arranged in parallel with the indoor pipeline, that is, the cold storage device is connected between the refrigeration outlet side of the outdoor heat exchanger 3 and the suction side of the compressor 1 through the cold storage pipeline, and the adjustment tank 21 is installed on the adjustment pipeline, and the adjustment pipeline is connected in series between the refrigeration outlet side of the indoor heat exchanger 19 and the cold storage throttle valve 14. Each pipeline is provided with an inlet branch and an outlet branch. The refrigeration inlet branch of the indoor pipeline is connected to the refrigeration inlet side of the indoor throttle valve 18 and the refrigeration outlet side of the outdoor heat exchanger 3. The refrigeration outlet branch of the indoor pipeline is connected to the refrigeration outlet side of the indoor heat exchanger 19 and the suction side of the compressor 1. The inlet branch of the cold storage pipeline is connected to the cold storage inlet side of the cold storage throttle valve 14 and the refrigeration outlet side of the outdoor heat exchanger 3. The outlet branch of the cold storage pipeline is connected to the cold storage outlet side of the cold storage 15 and the suction side of the compressor 1. The inlet branch of the adjustment pipeline is connected to the refrigeration outlet side of the indoor heat exchanger 19 and the inlet of the adjustment tank 21. The outlet branch of the adjustment pipeline is connected to the liquid outlet of the adjustment tank 21 and the cold storage inlet side of the cold storage throttle valve 14. The inlet and outlet branches of the indoor pipeline, the cold storage pipeline and the adjustment pipeline are all provided with control valves, which are used to adjust the on-off state of the branch in which they are located to switch the operating mode of the cold storage air-conditioning system.

[0076] Based on the series-parallel relationship between the cold storage device and the indoor heat exchange device, the cold storage air-conditioning system can operate in any one of the conventional air-conditioning mode, the separate cold storage mode, the first cooling and cold storage mode, and the second cooling and cold storage mode. In actual application, the conventional air-conditioning mode and at least one other mode can be designed into the cold storage air-conditioning system. For example, the operating mode of the cold storage air-conditioning system may only include the conventional air-conditioning mode, the first cooling and cold storage mode, and the second cooling and cold storage mode. The operating mode of the cold storage air-conditioning system may only include the conventional air-conditioning mode, the separate cold storage mode, the first cooling and cold storage mode, and the second cooling and cold storage mode.

[0077] When the cold storage air conditioning system is in normal air conditioning mode, the inlet and outlet branches of the indoor pipeline are connected, and the inlet and outlet branches of the cold storage pipeline and the inlet and outlet branches of the adjustment pipeline are all closed. Only the indoor heat exchanger 19 participates in the refrigerant circulation of the main circulation loop. The refrigerant flowing out of the outdoor heat exchanger 3 is all sent to the indoor throttle valve 18. After throttling, the refrigerant enters the indoor heat exchanger 19 and provides cooling to the room through the indoor heat exchanger 19. The refrigerant flowing out of the indoor heat exchanger 19 is then sent back to the suction side of the compressor 1.

[0078] When the cold storage air conditioning system is in the independent cold storage mode, the inlet and outlet branches of the indoor pipeline and the inlet and outlet branches of the adjustment pipeline are both shut off, and the inlet and outlet branches of the cold storage pipeline are connected. Only the cold storage device 15 participates in the refrigeration cycle of the main circulation loop. The refrigerant flowing out of the outdoor heat exchanger 3 is all sent to the cold storage throttle valve 14. After throttling, the refrigerant enters the cold storage device 15. The cold storage medium in the cold storage device 15 absorbs the cold energy of the refrigerant to store cold. The refrigerant flowing out of the cold storage device 15 is then sent back to the suction side of the compressor 1.

[0079] When the cold storage air-conditioning system is in the first cooling and cold storage mode, the inlet and outlet branches of the indoor pipeline and the inlet and outlet branches of the cold storage pipeline are connected, and the inlet and outlet branches of the adjustment pipeline are closed. The cold storage device 15 and the indoor heat exchanger 19 are connected in parallel to participate in the refrigeration cycle of the main circulation loop. A part of the refrigerant flowing out of the outdoor heat exchanger 3 is sent to the indoor throttle valve 18. After throttling, the refrigerant enters the indoor heat exchanger 19 and provides cooling to the indoor space through the indoor heat exchanger 19. Another part of the refrigerant flowing out of the outdoor heat exchanger 3 is sent to the cold storage throttle valve 14. After throttling, the refrigerant enters the cold storage device 15. The cold storage medium in the cold storage device 15 absorbs the cooling energy of the refrigerant to store cold. The refrigerant flowing out of the indoor heat exchanger 19 and the cold storage device 15 are combined and then sent back to the suction side of the compressor 1.

[0080] When the cold storage air-conditioning system is in the second cooling and cold storage mode, the cooling outlet branch of the indoor pipeline and the inlet branch of the cold storage pipeline are both closed, the cooling inlet branch of the indoor pipeline is connected, the outlet branch of the cold storage pipeline is connected, and the inlet and outlet branches of the adjustment pipeline are connected. The indoor heat exchanger 19, the adjustment tank 21 and the cold storage tank 15 are connected in series in sequence to participate in the refrigeration cycle of the main circulation loop. The refrigerant flowing out of the outdoor heat exchanger 3 is all sent to the indoor throttle valve 18. After throttling, the refrigerant enters the indoor heat exchanger 19 and provides cooling to the indoor through the indoor heat exchanger 19. The refrigerant flowing out of the indoor heat exchanger 19 is all sent to the adjustment tank 21. The liquid outlet of the adjustment tank 21 provides liquid refrigerant to the cold storage throttle valve 14. After throttling, the refrigerant enters the cold storage tank 15. The cold storage medium of the cold storage tank 15 absorbs the cooling capacity of the refrigerant to store cold. The refrigerant flowing out of the cold storage tank 15 is then sent back to the suction side of the compressor 1.

[0081] It should be understood that the conventional air-conditioning mode mentioned above is determined according to the refrigerant circulation flow direction of the air-conditioning system, and generally includes a separate cooling mode, that is, the refrigerant circulates in the main circulation loop for cooling.

[0082] like Figure 1 As shown, in order to enable the cold storage air conditioning system to meet more usage requirements, in some embodiments of the present invention, Main circulation loop It also includes a four-way valve 2 for switching the flow direction of the refrigerant. The four ports of the four-way valve 2 are respectively connected to the exhaust side of the compressor 1, the suction side of the compressor 1, the refrigeration inlet side of the outdoor heat exchanger 3 and the refrigeration outlet side of the indoor heat exchanger 19.

[0083] In this embodiment, the conventional air-conditioning mode includes a separate cooling mode and a separate heating mode. When the cold storage air-conditioning system is in the separate cooling mode, the indoor heat exchanger 19 participates in the cooling cycle of the main circulation loop; when the cold storage air-conditioning system is in the separate heating mode, the indoor heat exchanger 19 participates in the heating cycle of the main circulation loop. It should be understood that in the heating cycle, the cooling inlet branch of the indoor pipeline mentioned above is equivalent to the heating outlet branch, and the heating inlet branch connects the heating outlet side of the indoor throttle valve 18 and the heating inlet side of the outdoor heat exchanger 3. The cooling outlet branch of the indoor pipeline mentioned above is equivalent to the heating inlet branch, and the heating inlet branch connects the heating inlet side of the indoor heat exchanger 19 and the exhaust side of the compressor 1.

[0084] In a preferred embodiment of the present invention, a cold release pipeline with an adjustable on / off state is also connected between the cold storage device 15 and the indoor heat exchanger 19. The cold release pipeline includes a cold release inlet branch and a cold release outlet branch. One end of the cold release inlet branch is connected to the cold storage inlet side of the cold storage throttle valve 14, and the other end is connected to the cold storage outlet side of the cold storage device 15. One end of the cold release outlet branch is connected to the cold storage outlet side of the cold storage throttle valve 14, and the other end is connected to the refrigeration inlet side of the indoor throttle valve 18.

[0085] It should be understood that the on-off state of the cooling release pipeline is adjusted by a control valve, that is, control valves are installed on both the cooling release inlet branch and the cooling release outlet branch, but the preferred solution is to install a one-way valve 17 instead of a control valve on the cooling release outlet branch. The one-way valve 17 only allows the refrigerant to flow to the cooling inlet side of the indoor throttle valve 18. When the indoor inlet branch of the indoor pipeline is connected, the pressure at one end of the cooling release outlet branch connected to the cooling inlet side of the indoor throttle valve 18 is higher, and the refrigerant cannot flow from the low-pressure end to the high-pressure end, and the one-way valve 17 blocks the flow direction from the high-pressure end to the low-pressure end. At this time, it is equivalent to the cooling release outlet branch being closed. Compared with the control valve, the one-way valve 17 can achieve the same on-off switching function, and the one-way valve 17 has a lower cost and a simpler control logic.

[0086] Based on the above-mentioned cold release pipeline, the operating mode of the cold storage air-conditioning system also includes a cold release mode; when the cold storage air-conditioning system is in the cold release mode, the inlet and outlet branches of the adjustment pipeline are closed, and the cold storage device 15 and the indoor heat exchanger 19 are connected in series to participate in the refrigeration cycle of the main circulation loop. The cold storage device 15 is located upstream of the indoor heat exchanger. The refrigerant output by the outdoor heat exchanger 3 does not pass through the cold storage throttle valve 14, but is directly sent to the cold storage device 15 for supercooling. The refrigerant flowing out of the cold storage device 15 passes through the indoor throttle valve 18 and enters the indoor heat exchanger 19, and is then sent to the suction side of the compressor 1.

[0087] like Figure 1 As shown, in a preferred embodiment of the present invention, the compressor 1 has an air supply port, including but not limited to an ejection compressor or a two-stage compressor. The compressor 1 can perform primary compression on the refrigerant and then mix it with the refrigerant entering the air supply port for secondary compression. The air outlet of the adjustment tank 21 is connected to the air supply port via a first air supply outlet branch. When the adjustment tank 21 is connected in series with the indoor heat exchange device for cold storage, it participates in the refrigerant circulation. After the refrigerant sent from the indoor heat exchange device passes through the adjustment tank 21 for gas-liquid separation, the gaseous refrigerant enters the air supply port of the compressor 1 through the first air supply outlet branch, thereby increasing the enthalpy and reducing the compression ratio.

[0088] Based on this preferred embodiment, Main circulation loop The system further comprises a gas-liquid separator 8, which is connected between the refrigeration outlet side of the indoor heat exchange device and the suction side of the compressor 1. The gas outlet of the adjustment tank 21 is connected to the inlet of the gas-liquid separator 8 via a second gas supply outlet branch. The second gas supply outlet branch is equipped with a gas supply throttle valve 7, and the gas supply amount is adjusted by the gas supply throttle valve 7. That is, the gaseous refrigerant in the adjustment tank is output in two ways. If the opening of the gas supply throttle valve 7 is increased, the gaseous refrigerant entering the gas-liquid separator 8 increases, and the gaseous refrigerant entering the gas supply port decreases. If the opening of the gas supply throttle valve 7 is decreased, the gaseous refrigerant entering the gas-liquid separator 8 decreases, and the gaseous refrigerant entering the gas supply port increases.

[0089] In some embodiments of the present invention, Main circulation loop It also includes a subcooler 6, the main circuit of the subcooler 6 is connected between the refrigeration outlet side of the outdoor heat exchanger 3 and the refrigeration inlet side of the indoor heat exchange device, and the secondary circuit of the subcooler 6 is connected between the refrigeration outlet side of the outdoor heat exchanger 3 and the inlet of the gas-liquid separator 8, so that the subcooling degree of the refrigerant is increased by the subcooler 6.

[0090] In order to facilitate understanding of the various operating modes of the present invention, the refrigerant flow direction and valve status of each mode are described in detail below.

[0091]

[0092] Among them, an outdoor throttle valve 4 is installed on the refrigeration outlet side of the outdoor heat exchanger, a cold storage throttle valve 14 is installed on the cold storage inlet side of the cold storage device, an indoor throttle valve 18 is installed on the refrigeration inlet side of the indoor heat exchanger, the refrigeration inlet branch of the indoor pipeline is installed with a first indoor control valve 10, the inlet branch of the cold storage pipeline is installed with a first cold storage control valve 11, the cold release inlet branch is installed with a cold release control valve 12, the outlet branch of the cold storage pipeline is installed with a second cold storage control valve 13, the refrigeration outlet branch of the indoor pipeline is installed with a second indoor control valve 22, the inlet branch of the adjustment pipeline is installed with a first adjustment control valve 20, and the outlet branch of the adjustment pipeline is installed with a second adjustment control valve 16.

[0093] Single cooling mode

[0094] like Figure 3 As shown, in cooling-only mode, only the indoor heat exchanger is powered on to cool the indoor environment, while the cold storage device is not powered on. At this point, the high-temperature, high-pressure refrigerant discharged from compressor 1 passes through four-way valve 2 and enters outdoor heat exchanger 3 for condensation. It then passes through first indoor control valve 10 and enters indoor throttle valve 18 for throttling. It evaporates and cools in indoor heat exchanger 19, then returns to gas-liquid separator 8 and compressor 1 through second indoor control valve 22 and four-way valve 2.

[0095] Single cold storage mode

[0096] like Figure 4 As shown, in the independent cold storage mode, only the cold storage device is turned on to store cold, and the indoor heat exchanger is not turned on. At this time, the high-temperature and high-pressure refrigerant discharged from the compressor 1 passes through the four-way valve 2 and enters the outdoor heat exchanger 3 for condensation, and then passes through the first cold storage control valve 11 and enters the cold storage throttle valve 14 After the middle throttling, it enters the cold storage device 15 to evaporate, transfers the cold energy to the cold storage device 15 to store the cold energy, and then returns to the gas-liquid separator 8 and the compressor 1 through the second cold storage control valve 13.

[0097] First cooling and cold storage mode

[0098] like Figure 5As shown, in the first cooling and cold storage mode, the indoor heat exchanger and cold storage are connected in parallel, using the indoor heat exchanger for cooling while storing cold in the cold storage. At this time, the high-temperature, high-pressure refrigerant discharged from compressor 1 passes through four-way valve 2 and enters outdoor heat exchanger 3 for condensation. It is then divided into two parts. One part passes through first cold storage control valve 11 and enters cold storage throttle valve 14, where it is throttled. It then enters cold storage 15, where it evaporates and transfers cold energy to cold storage 15, thereby storing cold energy. It then passes through second cold storage control valve 13 and returns to gas-liquid separator 8 and compressor 1. The other part of the refrigerant passes through first indoor control valve 10 and enters indoor throttle valve 18, where it is throttled. It evaporates and cools in indoor heat exchanger 19, then passes through second indoor control valve 22 and four-way valve 2 to merge with the first part of the refrigerant and returns to gas-liquid separator 8 and compressor 1.

[0099] The first cooling and cold storage mode is suitable for the time when cold storage has just started. The cold storage device is cooling the hot water and has not yet reached the freezing point. The evaporation temperature required at this time is not very low (for example, if the water temperature is 30°C at this time, a refrigerant of about 20°C needs to flow through the cold storage device to cool it down. Then the evaporation temperature required, that is, the target evaporation temperature is 20°C). It is not much different from the target evaporation temperature required by an ordinary refrigeration indoor unit, or even higher.

[0100] Second cooling and cold storage mode

[0101] like Figure 6 As shown, in the second cooling and cold storage mode, indoor heat exchanger 19 and cold storage 15 are connected in series, using indoor heat exchanger 19 for cooling while storing cold in cold storage 15. At this time, the high-temperature, high-pressure refrigerant discharged from compressor 1 passes through four-way valve 2 and enters outdoor heat exchanger 3 for condensation. It then passes through first indoor control valve 10 and enters indoor throttle valve 18 for throttling. It evaporates and cools in indoor heat exchanger 19, passes through first adjustment control valve 20, and enters adjustment tank 21 for gas-liquid separation. The liquid refrigerant then passes through second adjustment control valve 16 and enters cold storage throttle valve 14 for throttling. It evaporates in cold storage 15, stores cold, and then returns to gas-liquid separator 8 and compressor 1 through second cold storage control valve 13 and four-way valve 2. The gaseous refrigerant in adjustment tank 21 enters the air inlet of compressor 1, where it mixes with the refrigerant that has undergone primary compression for secondary compression, increasing enthalpy and reducing the compression ratio.

[0102] For the second cooling and cold storage mode, the evaporation temperature required in the cold storage device is already very low (for example, the water temperature has dropped to 2°C, and it needs to be provided with a refrigerant of about -5°C to cool it down), which is significantly lower than the evaporation temperature required by the refrigeration unit.

[0103] Cooling mode

[0104] like Figure 7As shown, in the cooling mode, the cold storage device releases its stored cold energy and supplies it to the indoor heat exchanger for cooling. At this point, the high-temperature, high-pressure refrigerant discharged from compressor 1 passes through four-way valve 2 and enters the outdoor heat exchanger 3 for condensation. After passing through the first cold storage control valve 11 and the cold release control valve 12, it is further supercooled in the cold storage device 15 to increase cooling capacity. It then passes through one-way valve 17 and enters the indoor throttle valve 18 for throttling. It evaporates in the indoor heat exchanger 19 for cooling. It then passes through the second indoor control valve 22 and the four-way valve 2 to reunite with the first portion of refrigerant and returns to the gas-liquid separator 8 and compressor 1. In the cooling mode, cold is generally stored during off-peak electricity prices and released during peak electricity prices to reduce operating electricity costs.

[0105] Heating mode

[0106] like Figure 8 As shown, in heating mode, only the indoor heat exchanger is heating, and the cold storage device is not powered on. At this time, the high-temperature, high-pressure refrigerant discharged from compressor 1 passes through four-way valve 2 and second indoor control valve 22 into indoor heat exchanger 19 for condensation and heating. It then passes through indoor throttle valve 18 and first indoor control valve 10, is throttled by outdoor throttle valve 4, evaporates in outdoor heat exchanger 3, and returns to gas-liquid separator 8 and compressor 1 through four-way valve 2.

[0107] The present invention also provides an air conditioner having the above-mentioned cold storage air conditioning system. The operation mode and control logic of the air conditioner have been described in detail above.

[0108] The present invention also provides a storage medium, which is used to store a computer program. When the computer program is running, the above-mentioned heating control method is executed.

[0109] It should be noted that the terms used above are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present invention. When the terms "comprise" and / or "include" are used in this specification, they indicate the presence of features, steps, operations, devices, components and / or combinations thereof. The order of execution of actions, steps, etc. in the devices and methods shown in the specification and the drawings can be implemented in any order as long as there is no special explicit limitation on the order and as long as the output of the previous processing is not used in the subsequent processing. Similar sequential terms used for the convenience of description do not mean that they must be implemented in such an order.

[0110] Techniques, methods, and apparatus known to those of ordinary skill in the relevant art may not be discussed in detail, but where appropriate, such techniques, methods, and apparatus should be considered part of the specification. In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not limiting. Therefore, other examples of the exemplary embodiments may have different values. It should be noted that similar reference numerals and letters represent similar items in the following figures, and therefore, once an item is defined in one figure, it need not be further discussed in subsequent figures.

[0111] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A control method for a cold storage air conditioning system, characterized in that: include: Determine whether there is a demand for cooling and cold storage; If there is a demand for cooling and cold storage at the same time, the temperature of the cold storage medium T 介质 Dynamically calculating the target evaporation temperature Tb of the cold storage device, comparing the target evaporation temperature Ta of the indoor heat exchange device with the target evaporation temperature Tb, adjusting the indoor heat exchange device according to Ta, and adjusting the cold storage device according to the lower of Ta and Tb; When there is a cooling demand and a cold storage demand at the same time, and Ta≤Tb, the cold storage device is connected in parallel with the indoor heat exchange device, and both the indoor heat exchange device and the cold storage device are adjusted according to Ta; When there is a demand for cooling and a demand for cold storage at the same time, and Ta>Tb, an adjustment tank for providing liquid refrigerant to the cold storage device is connected in series between the indoor heat exchange device and the cold storage device, and the indoor heat exchange device is located upstream of the adjustment tank. The indoor heat exchange device is adjusted according to Ta, and the cold storage device is adjusted according to Tb.

2. The control method according to claim 1, characterized in that: The target evaporation temperature Tb is calculated by detecting the temperature of the cold storage medium T 介质 , according to the temperature T of the cold storage medium 介质 Obtain the corresponding target evaporation temperature Tb from the pre-established first calculation model; wherein the first calculation model only uses the cold storage medium temperature T 介质 As an input variable, the output variable of the first calculation model is the target evaporation temperature Tb.

3. The control method according to claim 2, characterized in that: The first calculation model includes a plurality of different medium temperature intervals, each of which is configured with an adjustment temperature, Tb=T 介质 -Bx, Bx is T 介质 The adjustment temperature of the medium temperature range, the lower the medium temperature range, the larger the adjustment temperature.

4. The control method according to claim 1, wherein: The target evaporation temperature Tb is calculated by detecting the temperature of the cold storage medium T 介质 and ambient temperature T 环 , according to the temperature T of the cold storage medium 介质 and ambient temperature T 环 Obtain the corresponding target evaporation temperature Tb from the pre-established second calculation model; wherein the second calculation model is based on the cold storage medium temperature T 介质 and ambient temperature T 环 As an input variable, the output variable of the second calculation model is the target evaporation temperature Tb.

5. The control method according to claim 4, characterized in that: The second calculation model includes multiple sets of different temperature intervals, each set of temperature intervals includes a medium temperature interval and an ambient temperature interval, and each set of temperature intervals is configured with an adjustment temperature, Tb=T 介质 -Bx, Bx is T 介质 and T 环 The adjustment temperature of the temperature range set; In a temperature interval set with the same medium temperature interval, the lower the ambient temperature interval, the larger the adjustment temperature configured; in a temperature interval set with the same ambient temperature interval, the lower the medium temperature interval, the larger the adjustment temperature configured.

6. The control method according to claim 1, characterized in that: The control method further includes: if there is only a cold storage demand, the cold storage medium temperature T 介质 The target evaporation temperature Tb of the cold storage device is dynamically calculated, and the cold storage device is adjusted according to Tb.

7. The control method according to claim 1, characterized in that: The control method further includes: if there is only a cold storage demand, then only the cold storage device among the indoor heat exchange device and the cold storage device participates in the refrigeration cycle; and / or if there is only a cooling demand, then only the indoor heat exchange device among the indoor heat exchange device and the cold storage device participates in the refrigeration cycle.

8. Cold storage air conditioning system, including: A main circulation loop and a cold storage device that can be connected to the main circulation loop, wherein the main circulation loop includes a compressor, an outdoor heat exchanger, and an indoor heat exchange device connected in sequence; it is characterized in that the controller of the cold storage air-conditioning system executes the control method described in any one of claims 1 to 7.

9. The cold storage air conditioning system according to claim 8, characterized in that: The cold storage air conditioning system also includes: an adjustment tank with a gas-liquid separation function, the cold storage device can be connected in parallel or in series with the indoor heat exchange device, and the adjustment tank participates in the refrigerant circulation when the cold storage device and the indoor heat exchange device are connected in series for cold storage, and is used to provide liquid refrigerant to the cold storage device.

10. The cold storage air conditioning system according to claim 9, characterized in that: The indoor heat exchange device comprises an indoor heat exchanger and an indoor throttle valve provided on the cooling inlet side of the indoor heat exchanger, and the indoor heat exchange device is installed on the indoor pipeline located in the main circulation loop; The cold storage device comprises a cold storage tank and a cold storage throttle valve provided on the cold storage inlet side of the cold storage tank, and the cold storage device is installed on a cold storage pipeline connected in parallel with the indoor pipeline; The adjustment tank is installed on the adjustment pipeline connected in series between the refrigeration outlet side of the indoor heat exchanger and the cold storage throttle valve; Among them, the inlet and outlet branches of each pipeline are provided with a control valve for adjusting the on-off state to switch the operating mode of the cold storage air-conditioning system.

11. The cold storage air conditioning system according to claim 10, characterized in that: The operation mode of the cold storage air conditioning system includes at least one of a conventional air conditioning mode, a single cold storage mode, a first cooling and cold storage mode, and a second cooling and cold storage mode; When the cold storage air conditioning system is in the normal air conditioning mode, the inlet and outlet branches of the cold storage pipeline and the inlet and outlet branches of the adjustment pipeline are both shut off, and only the indoor heat exchange device participates in the refrigerant circulation of the main circulation loop; and / or when the cold storage air conditioning system is in the separate cold storage mode, the inlet and outlet branches of the indoor pipeline and the inlet and outlet branches of the adjustment pipeline are both shut off, and only the cold storage device participates in the refrigeration cycle of the main circulation loop; and / or when the cold storage air conditioning system is in the first cooling and cold storage mode, the inlet and outlet branches of the adjustment pipeline are closed, and the cold storage device and the indoor heat exchange device are connected in parallel to participate in the refrigeration cycle of the main circulation loop; And / or when the cold storage air-conditioning system is in the second cooling and cold storage mode, the inlet and outlet branches of the adjustment pipeline are closed, the indoor heat exchange device, the adjustment tank and the cold storage device are connected in series in sequence to participate in the refrigeration cycle of the main circulation loop, and the indoor heat exchange device is located upstream of the adjustment tank.

12. The cold storage air conditioning system according to claim 11, characterized in that: The main circulation loop further includes a four-way valve for switching the flow direction of the refrigerant, wherein the four ports of the four-way valve are respectively connected to the exhaust side of the compressor, the suction side of the compressor, the cooling inlet side of the outdoor heat exchanger, and the cooling outlet side of the indoor heat exchanger; The conventional air-conditioning mode includes a separate cooling mode and a separate heating mode; When the cold storage air conditioning system is in the single cooling mode, the indoor heat exchange device participates in the refrigeration cycle of the main circulation loop; When the cold storage air conditioning system is in the single heating mode, the indoor heat exchange device participates in the heating cycle of the main circulation loop.

13. The cold storage air conditioning system according to claim 10, characterized in that: A cold release pipeline with an adjustable on-off state is also connected between the cold storage device and the indoor heat exchanger. The cold release pipeline includes a cold release inlet branch and a cold release outlet branch. One end of the cold release inlet branch is connected to the cold storage inlet side of the cold storage throttle valve, and the other end is connected to the cold storage outlet side of the cold storage device. One end of the cold release outlet branch is connected to the cold storage outlet side of the cold storage throttle valve, and the other end is connected to the refrigeration inlet side of the indoor throttle valve.

14. The cold storage air conditioning system according to claim 13, characterized in that: The cold release inlet branch is equipped with a control valve for adjusting the on-off state, and the cold release outlet branch is equipped with a one-way valve, which only allows the refrigerant to flow to the refrigeration inlet side of the indoor throttle valve.

15. The cold storage air conditioning system according to claim 13, characterized in that: The operation mode of the cold storage air conditioning system also includes a cold release mode; When the cold storage air conditioning system is in the cold release mode, the inlet and outlet branches of the adjustment pipeline are closed, the cold storage device and the indoor heat exchange device are connected in series to participate in the refrigeration cycle of the main circulation loop, and the cold storage device is located upstream of the indoor heat exchange device.

16. The cold storage air conditioning system according to claim 9, characterized in that: The compressor has an air supply port, and the air outlet of the adjustment tank is connected to the air supply port through a first air supply outlet branch.

17. The cold storage air conditioning system according to claim 16, characterized in that: The main circulation loop also includes a gas-liquid separator, which is connected between the refrigeration outlet side of the indoor heat exchange device and the suction side of the compressor. The air outlet of the adjustment tank is connected to the inlet of the gas-liquid separator through a second air supply outlet branch, and the second air supply outlet branch is equipped with an air supply throttle valve.

18. An air conditioner, characterized in that The air conditioner adopts the cold storage air conditioning system according to any one of claims 8 to 17.

19. A storage medium for storing a computer program, characterized in that: When the computer program is executed, the control method according to any one of claims 1 to 7 is executed.

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