Energy storage air conditioner and control method

Abstract

The invention provides an energy storage air conditioner and a control method. The energy storage air conditioner comprises a compressor, an outdoor heat exchanger, an indoor heat exchanger, an expansion valve, an energy storage tank, a first four-way valve, a second four-way valve, a refrigerant pump, a first control valve, a second control valve, a third control valve, a fourth control valve, a fifth control valve and a sixth control valve. Firstly, a connecting framework capable of being switched to operate under a refrigerating mode working condition, a cold storage mode working condition, a heating mode working condition, a heat storage mode working condition, an energy storage tank cold release mode working condition and an energy storage tank heat release mode working condition is provided; besides, energy is conveyed in a refrigerant latent heat mode in all operation mode working conditions, energy consumption of an ethylene glycol pump and a chilled water pump is reduced, and the conveying energy consumption is about one percent of sensible heat conveying energy consumption; intermediate links such as ethylene glycol and cold water are reduced in energy transfer, energy grade sacrifice in the energy transfer process is reduced, and the refrigerating and heating efficiency of the compressor is improved.

Description

Technical Field

[0001] The present invention belongs to the technical field of air conditioning, and in particular relates to an energy storage air conditioning and a control method thereof. Background Art

[0002] Energy storage air conditioning technology uses the low electricity consumption at night to store cold or heat, and releases cold or heat during the peak electricity consumption during the day, which can balance the load of the power grid. Users can save air conditioning operating costs by using the peak-valley electricity price difference. It has been increasingly widely used in large central air conditioning systems. However, due to the complexity of the system and the large number of auxiliary equipment, it is rarely used in household and small air conditioning systems.

[0003] Existing energy storage air conditioners Figure 1 As shown, the ice storage devices have only a separate cold storage function. If heat storage is required, a heat storage tank must be installed separately. When making ice, the dual-mode host transfers the cold from the refrigerant to ethylene glycol, and transfers the cold to the ice storage device through the ethylene glycol pump circulation to make ice. When cooling, the dual-mode host needs to transfer the cold from the refrigerant to ethylene glycol, and transfer the cold to chilled water through the ethylene glycol pump circulation through the plate heat exchanger, and then transfer the cold to indoor air through the terminal fan coil through the cold water pump circulation. When melting ice to provide cooling, the cold in the ice storage device is brought out through the ethylene glycol pump circulation and transferred to chilled water through the plate heat exchanger. In the above cold transport process, both the glycol pump and the chilled water pump consume a lot of energy; when transporting cold, the above-mentioned glycol pump and chilled water pump all transport sensible heat, with large transport flow and high energy consumption; cold is transferred from refrigerant to ethylene glycol, then to chilled water and finally to indoor air, and each transfer requires a temperature difference. During the transfer process, the quality of cold is gradually reduced. To obtain the same comfortable environment indoors, the dual-mode host needs to provide higher-quality cold, thereby reducing the efficiency of the dual-mode host. Summary of the invention

[0004] The first object of the present invention is to provide an energy storage air conditioner.

[0005] To this end, the above-mentioned purpose of the present invention is achieved through the following technical solutions:

[0006] An energy storage air conditioner, comprising a compressor, an outdoor heat exchanger, an indoor heat exchanger and an expansion valve, characterized in that it also comprises an energy storage tank, a first four-way valve, a second four-way valve, a refrigerant pump and a first control valve, a second control valve, a third control valve, a fourth control valve, a fifth control valve and a sixth control valve;

[0007] The compressor, the first four-way valve, the outdoor heat exchanger, the expansion valve, the second control valve, the indoor heat exchanger, the fourth control valve, and the sixth control valve are connected in series in sequence; the compressor is connected to the outdoor heat exchanger via the first four-way valve, and the compressor is connected to the sixth control valve via the first compressor;

[0008] The first control valve, the energy storage tank, and the third control valve are connected in series and in parallel with the outdoor heat exchanger and the expansion valve; the third control valve is connected to the sixth control valve;

[0009] The first control valve, the energy storage tank, and the third control valve are connected in series and in parallel with the second control valve, the indoor heat exchanger, and the fourth control valve;

[0010] The refrigerant pump is connected to the second control valve via the second four-way valve, the refrigerant pump is connected to the fifth control valve via the second four-way valve, and the fifth control valve is connected to the energy storage tank.

[0011] While adopting the above technical solutions, the present invention may also adopt or combine the following technical solutions:

[0012] As a preferred technical solution of the present invention: port a of the first four-way valve is connected to the sixth control valve, ports b and d of the first four-way valve are respectively connected to the compressor, and port c of the first four-way valve is connected to the outdoor heat exchanger.

[0013] As a preferred technical solution of the present invention: port a of the second four-way valve is connected to the fifth control valve, ports b and d of the second four-way valve are respectively connected to the refrigerant pump, and port c of the second four-way valve is connected to the second control valve.

[0014] As a preferred technical solution of the present invention: the energy storage tank is composed of a heat-insulating shell, a heat exchange coil in the heat-insulating shell, an energy storage medium in the heat-insulating shell, and a plurality of sensors.

[0015] As a preferred technical solution of the present invention: the energy storage medium is a phase change material.

[0016] As a preferred technical solution of the present invention: the energy storage medium is preferably water, and the energy storage in summer mainly utilizes the latent heat of water freezing, and the energy storage in winter mainly utilizes the sensible heat of water temperature rise.

[0017] As a preferred technical solution of the present invention: the sensor is a temperature sensor, a pressure sensor, or a liquid level sensor;

[0018] The pressure sensor and the temperature sensor are arranged at the inlet and outlet of the heat exchange coil;

[0019] The liquid level sensor is arranged on the inner side wall of the heat-insulating shell or the inner side of the top of the heat-insulating shell.

[0020] Another object of the present invention is to provide a control method for the energy storage air conditioner as described above.

[0021] To this end, the above-mentioned purpose of the present invention is achieved through the following technical solutions:

[0022] According to the control method of the energy storage air conditioner described above, it is characterized in that: the control method is used to control the energy storage air conditioner to switch between the cooling mode working condition, the cold storage mode working condition, the heating mode working condition, the heat storage mode working condition, the energy storage tank cold release mode working condition, and the energy storage tank heat release mode working condition;

[0023] 1) In cooling mode:

[0024] The high-temperature and high-pressure refrigerant gas at the compressor outlet enters the outdoor heat exchanger through the first four-way valve, is condensed into medium-temperature and high-pressure refrigerant liquid in the outdoor heat exchanger, and becomes low-temperature and low-pressure refrigerant liquid through the expansion valve. The first control valve and the fifth control valve are closed, and the second control valve is opened. The low-temperature and low-pressure refrigerant liquid enters the indoor heat exchanger through the second control valve for heat exchange, and the low-temperature and low-pressure refrigerant liquid evaporates into low-temperature and low-pressure refrigerant gas. The third control valve is closed, and the fourth control valve and the sixth control valve are opened. The low-temperature and low-pressure refrigerant gas enters the compressor through the fourth control valve, the sixth control valve, and the first four-way valve and is compressed into high-temperature and high-pressure refrigerant gas by the compressor.

[0025] 2) In the cold storage mode:

[0026] The high-temperature and high-pressure refrigerant gas at the compressor outlet enters the outdoor heat exchanger through the first four-way valve, is condensed into medium-temperature and high-pressure refrigerant liquid in the outdoor heat exchanger, and becomes low-temperature and low-pressure refrigerant liquid through the expansion valve. The second control valve and the fifth control valve are closed, and the first control valve is opened. The low-temperature and low-pressure refrigerant liquid enters the energy storage tank through the first control valve. The energy storage medium in the energy storage tank absorbs the coldness of the refrigerant in the heat exchange coil of the energy storage tank, and the refrigerant evaporates into low-temperature and low-pressure refrigerant gas. The fourth control valve is closed, and the third control valve and the sixth control valve are opened. The low-temperature and low-pressure refrigerant gas enters the compressor through the third control valve, the sixth control valve, and the first four-way valve and is compressed into high-temperature and high-pressure refrigerant gas by the compressor.

[0027] 3) In heating mode:

[0028] The third control valve is closed, and the sixth and fourth control valves are opened. The high-temperature and high-pressure refrigerant gas at the compressor outlet enters the indoor heat exchanger through the first four-way valve, the sixth and fourth control valves, and the high-temperature and high-pressure refrigerant gas is condensed into medium-temperature and high-pressure refrigerant liquid. The first and fifth control valves are closed, and the second control valve is opened. The medium-temperature and high-pressure refrigerant liquid enters the expansion valve through the second control valve and becomes a low-temperature and low-pressure refrigerant liquid, enters the outdoor heat exchanger, evaporates into a low-temperature and low-pressure refrigerant gas, enters the compressor through the first four-way valve, and is compressed into a high-temperature and high-pressure refrigerant gas by the compressor;

[0029] 4) In the heat storage mode:

[0030] Close the fourth control valve, open the third control valve and the sixth control valve, and the high-temperature and high-pressure refrigerant gas at the compressor outlet enters the energy storage tank through the first four-way valve, the sixth control valve, and the third control valve. The energy storage medium in the energy storage tank absorbs the heat of the refrigerant in the heat exchange coil of the energy storage tank, and the refrigerant condenses into medium-temperature and high-pressure refrigerant liquid. Close the fifth control valve and the second control valve, and open the first control valve. The medium-temperature and high-pressure refrigerant liquid enters the expansion valve through the first control valve and becomes a low-temperature and low-pressure refrigerant liquid, enters the outdoor heat exchanger, evaporates into a low-temperature and low-pressure refrigerant gas, enters the compressor through the first four-way valve, and is compressed into a high-temperature and high-pressure refrigerant gas by the compressor;

[0031] 5) When the energy storage tank is in cooling mode:

[0032] Close the first control valve, open the fifth control valve and the second control valve, the low-temperature and low-pressure refrigerant liquid in the energy storage tank enters the indoor heat exchanger through the fifth control valve, the second four-way valve, the refrigerant pump, and the second control valve, the low-temperature and low-pressure refrigerant liquid absorbs heat and evaporates into low-temperature and low-pressure refrigerant gas, close the sixth control valve, open the third control valve and the fourth control valve, the low-temperature and low-pressure refrigerant gas enters the heat exchange coil of the energy storage tank through the fourth control valve and the third control valve, the energy storage medium in the energy storage tank releases the cold to the refrigerant in the heat exchange coil of the energy storage tank, and condenses the low-temperature and low-pressure refrigerant gas into low-temperature and low-pressure refrigerant liquid;

[0033] 6) When the energy storage tank is in heat release mode:

[0034] Close the sixth control valve, open the third control valve and the fourth control valve, the medium-temperature and medium-pressure refrigerant gas in the energy storage tank enters the indoor heat exchanger through the third control valve and the fourth control valve, the medium-temperature refrigerant gas releases heat and condenses into medium-temperature refrigerant liquid, close the first control valve, open the second control valve and the fifth control valve, the medium-temperature refrigerant liquid enters the heat exchange coil of the energy storage tank through the second control valve, the second four-way valve, the refrigerant pump and the fifth control valve, the refrigerant in the heat exchange coil of the energy storage tank absorbs the heat of the energy storage medium in the energy storage tank and evaporates into medium-temperature refrigerant gas.

[0035] While adopting the above technical solutions, the present invention may also adopt or combine the following technical solutions:

[0036] As a preferred technical solution of the present invention: in the heat storage mode or the energy storage tank heat release mode, electric auxiliary heating can be used to provide heat to the energy storage tank.

[0037] The present invention provides an energy storage air conditioner and a control method. First, a connection structure is provided that can switch between cooling mode, cold storage mode, heating mode, heat storage mode, energy storage tank cold release mode and energy storage tank heat release mode. In addition, all operating modes transmit energy in the form of latent heat of refrigerant, reducing the energy consumption of ethylene glycol pump and chilled water pump, and the transmission energy consumption is about one percent of the sensible heat transmission energy consumption. Energy transfer reduces intermediate links such as ethylene glycol and cold water, reduces energy quality sacrifice in the energy transfer process, and improves the cooling and heating efficiency of the compressor. In addition, the dual needs of cold storage and heat storage are met with the same energy storage tank.

[0038] In addition, the connection architecture provided by the present invention is simple, and only requires the addition of an energy storage tank, a refrigerant pump, two four-way valves, six control valves, a liquid storage tank, a gas-liquid separator and other auxiliary equipment on the basis of a conventional air conditioner. In addition, a control system is added, and there is no need to add equipment such as an ethylene glycol pump, a chilled water pump and a plate heat exchanger. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] Figure 1 The figure is a structural diagram of an existing ice storage air conditioner.

[0040] Figure 2 This is a structural diagram of the energy storage air conditioner provided by the present invention.

[0041] Figure 3 This is a diagram of the energy storage air conditioner provided by the present invention in cooling mode.

[0042] Figure 4 This is a diagram of the energy storage air conditioner provided by the present invention in the cold storage mode.

[0043] Figure 5 This is a diagram of the energy storage air conditioner provided by the present invention in the heating mode.

[0044] Figure 6 This is a diagram of the energy storage air conditioner provided by the present invention in the heat storage mode.

[0045] Figure 7 This is a diagram of the energy storage air conditioner provided by the present invention in the energy storage tank cooling release mode.

[0046] Figure 8 This is a diagram of the energy storage air conditioner provided by the present invention in the energy storage tank heat release mode.

[0047] In the figure: 1- compressor; 2- first four-way valve; 3- energy storage tank; 4- indoor heat exchanger; 5- refrigerant pump; 6- second four-way valve; 7- expansion valve; 8- outdoor heat exchanger. DETAILED DESCRIPTION

[0048] The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.

[0049] An energy storage air conditioner, comprising a compressor 1, an indoor heat exchanger 4, an expansion valve 7 and an outdoor heat exchanger 8, and also comprising a first four-way valve 2, an energy storage tank 3, a refrigerant pump 5, a second four-way valve 6 and a first control valve V1, a second control valve V2, a third control valve V3, a fourth control valve V4, a fifth control valve V5, and a sixth control valve V6;

[0050] The compressor 1, the first four-way valve 2, the outdoor heat exchanger 8, the expansion valve 7, the second control valve V2, the indoor heat exchanger 4, the fourth control valve V4, and the sixth control valve V6 are connected in series in sequence; the compressor 1 is connected to the outdoor heat exchanger 8 via the first four-way valve 2, and the compressor 1 is connected to the sixth control valve V6 via the first compressor 1;

[0051] The first control valve V1, the energy storage tank 3, and the third control valve V3 are connected in series and in parallel with the outdoor heat exchanger 8 and the expansion valve 7; the third control valve V3 is connected to the sixth control valve V6;

[0052] The first control valve V1, the energy storage tank 3, and the third control valve V3 are connected in series and in parallel with the second control valve V2, the indoor heat exchanger 4, and the fourth control valve V4;

[0053] The refrigerant pump 5 is connected to the second control valve V2 via the second four-way valve 6 , the refrigerant pump 5 is connected to the fifth control valve V5 via the second four-way valve 6 , and the fifth control valve V5 is connected to the energy storage tank 3 .

[0054] In addition, it also includes some conventional auxiliary equipment, such as: liquid storage tank, gas-liquid separator, etc. In addition, it also includes a control system to realize the opening and closing of the first control valve V1, the second control valve V2, the third control valve V3, the fourth control valve V4, the fifth control valve V5, and the sixth control valve V6.

[0055] The energy storage air conditioner provided by the present invention is switched through the refrigerant pipeline. During the low-peak electricity period at night in summer, the cold energy can be stored in the energy storage tank 3. During the peak electricity price period in the daytime, the refrigerant pump 5 is circulated to release the cold energy in the energy storage tank 3 to provide cooling. During the low-peak electricity period at night in winter, the heat pump system or electric auxiliary heating can be used to store heat in the energy storage tank 3. During the peak electricity price period in the daytime, the refrigerant pump 5 is circulated to release the heat in the energy storage tank 3 to provide heating.

[0056] In this embodiment, port a of the first four-way valve 2 is connected to the sixth control valve V6, ports b and d of the first four-way valve 2 are respectively connected to the compressor 1, and port c of the first four-way valve 2 is connected to the outdoor heat exchanger 8.

[0057] In this embodiment, port a of the second four-way valve 6 is connected to the fifth control valve V5, ports b and d of the second four-way valve 6 are respectively connected to the refrigerant pump 5, and port c of the second four-way valve 6 is connected to the second control valve V2.

[0058] In this embodiment, the energy storage tank 3 is composed of a heat-insulating shell, a heat exchange coil in the heat-insulating shell, an energy storage medium in the heat-insulating shell, and a plurality of sensors.

[0059] In this embodiment, the energy storage medium is water. The energy storage in summer mainly utilizes the latent heat of water freezing, and the energy storage in winter mainly utilizes the sensible heat of water temperature rise. In other embodiments, other phase change materials can also be used.

[0060] In this embodiment, the sensor is a temperature sensor, a pressure sensor, and a liquid level sensor;

[0061] The pressure sensor and the temperature sensor are arranged at the inlet and outlet of the heat exchange coil;

[0062] The liquid level sensor is arranged on the inner side wall of the heat-insulating shell or the inner side of the top of the heat-insulating shell.

[0063] Specifically, the energy storage air conditioner performs operating condition control in the following manner:

[0064] Table 1 Control table of different operation modes

[0065] Operation Mode Refrigeration Heating Cold storage Thermal storage Cooling Heat Release compressor run run run run stop stop Refrigerant pump stop stop stop stop run run Outdoor heat exchanger run run run run stop stop Indoor heat exchanger run run stop stop run run Energy storage tank stop stop run run run run Expansion valve Refrigeration Heating Ice storage Thermal storage stop stop First four-way valve ad,bc cd,ba ad,bc cd,ba / / Second four-way valve / / / / ad,bc cd,ba Control valve V1 close close open open close close Control valve V2 open open close close open open Control valve V3 close close open open open open Control valve V4 open open close close open open Control valve V5 close close close close open open Control valve V6 open open open open close close

[0066] Refrigeration mode working conditions: The high-temperature and high-pressure refrigerant gas at the compressor outlet enters the outdoor heat exchanger through the first four-way valve (bc), is condensed into medium-temperature and high-pressure refrigerant liquid in the outdoor heat exchanger, becomes low-temperature and low-pressure refrigerant liquid through the expansion valve, and then enters the indoor heat exchanger through the control valve V2; in the air-conditioned room, the refrigerant in the indoor heat exchanger absorbs the heat of the room to cool the room, and the refrigerant evaporates into low-temperature refrigerant gas and returns to the compressor through the control valve V4 and the first four-way valve (ad). In the compressor, the refrigerant is compressed into high-temperature and high-pressure gas.

[0067] Cold storage mode working condition: The high-temperature and high-pressure refrigerant gas at the compressor outlet enters the outdoor heat exchanger through the first four-way valve (bc), condenses into medium-temperature and high-pressure refrigerant liquid in the outdoor heat exchanger, becomes low-temperature and low-pressure refrigerant through the expansion valve, and then enters the energy storage tank through the control valve V1. In the energy storage tank, the refrigerant in the heat exchange coil absorbs the heat of the energy storage medium water in the energy storage tank, causing the water to freeze. The refrigerant evaporates into low-temperature refrigerant gas and returns to the compressor through the control valve V3 and the first four-way valve (ad). In the compressor, the refrigerant is compressed into high-temperature and high-pressure gas.

[0068] Heating mode working conditions: The high-temperature and high-pressure refrigerant gas at the compressor outlet passes through the first four-way valve (ba) and the control valve V4 into the indoor heat exchanger. In the air-conditioned room, the refrigerant in the indoor heat exchanger releases heat to warm the air-conditioned room. The refrigerant condenses into a medium-temperature and high-pressure refrigerant liquid, passes through the control valve V2 and the expansion valve to become a low-temperature and low-pressure refrigerant, and enters the outdoor heat exchanger. In the outdoor heat exchanger, the refrigerant absorbs heat from the outdoor air. The refrigerant evaporates into a low-temperature refrigerant gas and returns to the compressor through the first four-way valve (cd). In the compressor, the refrigerant is compressed into a high-temperature and high-pressure gas.

[0069] Thermal storage mode working conditions: The high-temperature and high-pressure refrigerant gas at the compressor outlet passes through the first four-way valve (ba) and the control valve V3 into the energy storage tank. The refrigerant in the energy storage tank releases heat to heat the energy storage medium water in the energy storage tank, condenses into medium-temperature and high-pressure refrigerant liquid, and then passes through the control valve V1 and the expansion valve to become low-temperature and low-pressure refrigerant and enter the outdoor heat exchanger; in the outdoor heat exchanger, the refrigerant absorbs heat from the outdoor air, and the refrigerant evaporates into low-temperature refrigerant gas and returns to the compressor through the first four-way valve (cd). In the compressor, the refrigerant is compressed into high-temperature and high-pressure gas.

[0070] Energy storage tank cold release mode working condition: the low-temperature and low-pressure refrigerant liquid in the energy storage tank passes through the control valve V5, then through the second four-way valve (ad), through the refrigerant pump, then through the second four-way valve (bc), and then through the control valve V2 to enter the indoor heat exchanger. In the air-conditioned room, the refrigerant in the indoor heat exchanger absorbs the heat of the room and cools the room. The refrigerant evaporates into low-temperature refrigerant gas and returns to the energy storage tank through the control valve V4 and control valve V3. The energy storage medium ice in the energy storage tank melts and releases cold energy to condense the low-temperature refrigerant gas into low-temperature refrigerant liquid.

[0071] Energy storage tank heat release mode working condition: the medium-temperature and medium-pressure refrigerant liquid in the indoor heat exchanger enters the energy storage tank through the control valve V2, the second four-way valve (cd), the refrigerant pump, the second four-way valve (ba), and the control valve V5; in the energy storage tank, the refrigerant in the coil absorbs the heat of the energy storage medium water in the energy storage tank, and the refrigerant evaporates into medium-temperature and medium-pressure refrigerant gas and returns to the indoor heat exchanger through the control valve V3 and the control valve V4. In the air-conditioned room, the refrigerant gas in the indoor heat exchanger releases heat to heat up the air-conditioned room, and the refrigerant gas condenses into medium-temperature refrigerant liquid.

[0072] The above-mentioned specific implementation methods are used to explain the present invention and are only preferred embodiments of the present invention, rather than limiting the present invention. Any modifications, equivalent substitutions, improvements, etc. made to the present invention within the spirit of the present invention and the protection scope of the claims shall fall within the protection scope of the present invention.

Claims

1. An energy storage air conditioner, comprising a compressor, an outdoor heat exchanger, an indoor heat exchanger and an expansion valve, characterized in that: It also includes an energy storage tank, a first four-way valve, a second four-way valve, a refrigerant pump, and a first control valve, a second control valve, a third control valve, a fourth control valve, a fifth control valve, and a sixth control valve; The compressor, the first four-way valve, the outdoor heat exchanger, the expansion valve, the second control valve, the indoor heat exchanger, the fourth control valve, and the sixth control valve are connected in series in sequence; the compressor is connected to the outdoor heat exchanger via the first four-way valve, and the compressor is connected to the sixth control valve via the first compressor; The first control valve, the energy storage tank, and the third control valve are connected in series and in parallel with the outdoor heat exchanger and the expansion valve; the third control valve is connected to the sixth control valve; The first control valve, the energy storage tank, and the third control valve are connected in series and in parallel with the second control valve, the indoor heat exchanger, and the fourth control valve; The refrigerant pump is connected to the second control valve via the second four-way valve, the refrigerant pump is connected to the fifth control valve via the second four-way valve, and the fifth control valve is connected to the energy storage tank.

2. The energy storage air conditioner according to claim 1, characterized in that: The port a of the first four-way valve is connected to the sixth control valve, the ports b and d of the first four-way valve are respectively connected to the compressor, and the port c of the first four-way valve is connected to the outdoor heat exchanger.

3. The energy storage air conditioner according to claim 1, characterized in that: The port a of the second four-way valve is connected to the fifth control valve, the ports b and d of the second four-way valve are respectively connected to the refrigerant pump, and the port c of the second four-way valve is connected to the second control valve.

4. The energy storage air conditioner according to claim 1, characterized in that: The energy storage tank is composed of a heat-insulating shell, a heat exchange coil in the heat-insulating shell, an energy storage medium in the heat-insulating shell, and a plurality of sensors.

5. The energy storage air conditioner according to claim 4, characterized in that: The energy storage medium is a phase change material.

6. The energy storage air conditioner according to claim 4, characterized in that: The energy storage medium is preferably water.

7. The energy storage air conditioner according to claim 4, characterized in that: The sensors are temperature sensors, pressure sensors, and liquid level sensors; The pressure sensor and the temperature sensor are arranged at the inlet and outlet of the heat exchange coil; The liquid level sensor is arranged on the inner side wall of the heat-insulating shell or the inner side of the top of the heat-insulating shell.

8. The control method of the energy storage air conditioner according to any one of claims 1 to 7, characterized in that: The control method is used to control the energy storage air conditioner to switch between a cooling mode, a cold storage mode, a heating mode, a heat storage mode, an energy storage tank cold release mode, and an energy storage tank heat release mode; 1) In cooling mode: The high-temperature and high-pressure refrigerant gas at the compressor outlet enters the outdoor heat exchanger through the first four-way valve, is condensed into medium-temperature and high-pressure refrigerant liquid in the outdoor heat exchanger, and becomes low-temperature and low-pressure refrigerant liquid through the expansion valve. The first control valve and the fifth control valve are closed, and the second control valve is opened. The low-temperature and low-pressure refrigerant liquid enters the indoor heat exchanger through the second control valve for heat exchange, and the low-temperature and low-pressure refrigerant liquid evaporates into low-temperature and low-pressure refrigerant gas. The third control valve is closed, and the fourth control valve and the sixth control valve are opened. The low-temperature and low-pressure refrigerant gas enters the compressor through the fourth control valve, the sixth control valve, and the first four-way valve and is compressed into high-temperature and high-pressure refrigerant gas by the compressor. 2) In the cold storage mode: The high-temperature and high-pressure refrigerant gas at the compressor outlet enters the outdoor heat exchanger through the first four-way valve, is condensed into medium-temperature and high-pressure refrigerant liquid in the outdoor heat exchanger, and becomes low-temperature and low-pressure refrigerant liquid through the expansion valve. The second control valve and the fifth control valve are closed, and the first control valve is opened. The low-temperature and low-pressure refrigerant liquid enters the energy storage tank through the first control valve. The energy storage medium in the energy storage tank absorbs the coldness of the refrigerant in the heat exchange coil of the energy storage tank, and the refrigerant evaporates into low-temperature and low-pressure refrigerant gas. The fourth control valve is closed, and the third control valve and the sixth control valve are opened. The low-temperature and low-pressure refrigerant gas enters the compressor through the third control valve, the sixth control valve, and the first four-way valve and is compressed into high-temperature and high-pressure refrigerant gas by the compressor. 3) In heating mode: The third control valve is closed, and the sixth and fourth control valves are opened. The high-temperature and high-pressure refrigerant gas at the compressor outlet enters the indoor heat exchanger through the first four-way valve, the sixth and fourth control valves, and the high-temperature and high-pressure refrigerant gas is condensed into medium-temperature and high-pressure refrigerant liquid. The first and fifth control valves are closed, and the second control valve is opened. The medium-temperature and high-pressure refrigerant liquid enters the expansion valve through the second control valve and becomes a low-temperature and low-pressure refrigerant liquid, enters the outdoor heat exchanger, evaporates into a low-temperature and low-pressure refrigerant gas, enters the compressor through the first four-way valve, and is compressed into a high-temperature and high-pressure refrigerant gas by the compressor; 4) In the heat storage mode: Close the fourth control valve, open the third control valve and the sixth control valve, and the high-temperature and high-pressure refrigerant gas at the compressor outlet enters the energy storage tank through the first four-way valve, the sixth control valve, and the third control valve. The energy storage medium in the energy storage tank absorbs the heat of the refrigerant in the heat exchange coil of the energy storage tank, and the refrigerant condenses into medium-temperature and high-pressure refrigerant liquid. Close the fifth control valve and the second control valve, and open the first control valve. The medium-temperature and high-pressure refrigerant liquid enters the expansion valve through the first control valve and becomes a low-temperature and low-pressure refrigerant liquid, enters the outdoor heat exchanger, evaporates into a low-temperature and low-pressure refrigerant gas, enters the compressor through the first four-way valve, and is compressed into a high-temperature and high-pressure refrigerant gas by the compressor; 5) When the energy storage tank is in cooling mode: Close the first control valve, open the fifth control valve and the second control valve, the low-temperature and low-pressure refrigerant liquid in the energy storage tank enters the indoor heat exchanger through the fifth control valve, the second four-way valve, the refrigerant pump, and the second control valve, the low-temperature and low-pressure refrigerant liquid absorbs heat and evaporates into low-temperature and low-pressure refrigerant gas, close the sixth control valve, open the third control valve and the fourth control valve, the low-temperature and low-pressure refrigerant gas enters the heat exchange coil of the energy storage tank through the fourth control valve and the third control valve, the energy storage medium in the energy storage tank releases the cold to the refrigerant in the heat exchange coil of the energy storage tank, and condenses the low-temperature and low-pressure refrigerant gas into low-temperature and low-pressure refrigerant liquid; 6) When the energy storage tank is in heat release mode: Close the sixth control valve, open the third control valve and the fourth control valve, the medium-temperature and medium-pressure refrigerant gas in the energy storage tank enters the indoor heat exchanger through the third control valve and the fourth control valve, the medium-temperature refrigerant gas releases heat and condenses into medium-temperature refrigerant liquid, close the first control valve, open the second control valve and the fifth control valve, the medium-temperature refrigerant liquid enters the heat exchange coil of the energy storage tank through the second control valve, the second four-way valve, the refrigerant pump and the fifth control valve, the refrigerant in the heat exchange coil of the energy storage tank absorbs the heat of the energy storage medium in the energy storage tank and evaporates into medium-temperature refrigerant gas.

9. The control method of the energy storage air conditioner according to claim 8, characterized in that: In the heat storage mode or the energy storage tank heat release mode, electric auxiliary heating is used to provide heat to the energy storage tank.

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