Energy storage air conditioner

Abstract

The utility model provides an energy storage air conditioner. 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, the utility model provides a connecting framework which can be switched to operate under a refrigeration 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; 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 utility model belongs to the technical field of air conditioners, and particularly relates to an energy storage air conditioner. Background Art

[0002] Energy storage air conditioner technology stores cooling capacity or heat during the off-peak electricity period at night and releases the cooling capacity or heat during the peak electricity consumption period during the day, which can balance the power grid load. Users can save the air conditioner operation cost by using the peak-valley electricity price difference, and it has been more and more widely applied in large central air conditioning systems. However, due to the complex system and many auxiliary devices, it is hardly applied in household and small air conditioning systems.

[0003] Existing energy storage air conditioners, as Figure 1 shown, the ice storage devices only have a single cooling storage function. If heat storage is required, a heat storage tank must be set separately; when making ice, the dual-condition host transfers the cooling capacity from the refrigerant to ethylene glycol, and the cooling capacity is transferred to the ice storage device to make ice through the circulation of the ethylene glycol pump; when refrigerating, the dual-condition host needs to transfer the cooling capacity from the refrigerant to ethylene glycol, and the cooling capacity is transferred to the chilled water through the circulation of the ethylene glycol pump via a plate heat exchanger, and then the cooling capacity is transferred to the indoor air through the circulation of the chilled water pump through the terminal fan coil unit; when melting ice for cooling, the cooling capacity in the ice storage device is taken out through the circulation of the ethylene glycol pump and transferred to the chilled water through a plate heat exchanger. In the above cooling capacity transmission process, both the ethylene glycol pump and the chilled water pump consume a large amount of energy; when the above ethylene glycol pump and chilled water pump transport the cooling capacity, they both transport sensible heat, with a large transport flow rate and high energy consumption; the cooling capacity is transferred from the refrigerant to ethylene glycol, then to chilled water, and finally to the indoor air. Each transfer requires a temperature difference, and during the transfer process, the quality of the cooling capacity gradually decreases. To obtain the same comfortable indoor environment, the dual-condition host needs to provide a higher-quality cooling capacity, thereby reducing the efficiency of the dual-condition host. Summary of the Utility Model

[0004] The purpose of the utility model is to provide an energy storage air conditioner.

[0005] To this end, the above object of the utility model is achieved by the following technical solutions:

[0006] An energy storage air conditioner includes a compressor, an outdoor heat exchanger, an indoor heat exchanger, and an expansion valve, and is characterized in that: it further 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;

[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 through the first four-way valve, and the compressor is connected to the sixth control valve through the first compressor;

[0008] The first control valve, the energy storage tank, and the third control valve are connected in series and are 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 are 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 through a second four-way valve, the refrigerant pump is connected to the fifth control valve through a 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 utility model can also adopt or combine the following technical solutions:

[0012] As a preferred technical solution of the present utility model: 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.

[0013] As a preferred technical solution of the present utility model: 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.

[0014] As a preferred technical solution of the present utility model: the energy storage tank is composed of a heat preservation shell, heat exchange coils inside the heat preservation shell, energy storage medium inside the heat preservation shell, and several sensors.

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

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

[0017] As a preferred technical solution of the present utility model: the sensors are temperature sensors, pressure sensors, and liquid level sensors;

[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 preservation shell or the inner side of the top of the heat preservation shell.

[0020] The present utility model provides an energy storage air conditioner. First, a connection structure is provided that can switch and operate under the working conditions of a refrigeration mode, a chilled water storage mode, a heating mode, a heat storage mode, a chilled water release mode of the energy storage tank, and a heat release mode of the energy storage tank. In addition, all operating mode conditions transfer energy in the form of the latent heat of the refrigerant, reducing the energy consumption of the ethylene glycol pump and the chilled water pump. The transmission energy consumption is about one percent of the sensible heat transmission energy consumption. The energy transfer reduces intermediate links such as ethylene glycol and chilled water, reduces the sacrifice of energy quality during the energy transfer process, and improves the refrigeration and heating efficiency of the compressor. In addition, the same energy storage tank is used to meet the dual requirements of chilled water storage and heat storage.

[0021] In addition, the connection structure provided by the present utility model is simple. Only an energy storage tank, a refrigerant pump, two four-way valves, six control valves, and auxiliary equipment such as a liquid storage tank and a gas-liquid separator need to be added on the basis of a conventional air conditioner. In addition, a control system is added, and equipment such as an ethylene glycol pump, a chilled water pump, and a plate heat exchanger do not need to be added. Brief Description of the Drawings

[0022] Figure 1 It is a structural diagram of an existing ice storage air conditioner.

[0023] Figure 2 It is a structural diagram of the energy storage air conditioner provided by the present utility model.

[0024] Figure 3 It is a diagram of the energy storage air conditioner provided by the present utility model under the working condition of the refrigeration mode.

[0025] Figure 4 It is a diagram of the energy storage air conditioner provided by the present utility model under the working condition of the chilled water storage mode.

[0026] Figure 5 It is a diagram of the energy storage air conditioner provided by the present utility model under the working condition of the heating mode.

[0027] Figure 6 It is a diagram of the energy storage air conditioner provided by the present utility model under the working condition of the heat storage mode.

[0028] Figure 7 It is a diagram of the energy storage air conditioner provided by the present utility model under the working condition of the chilled water release mode of the energy storage tank.

[0029] Figure 8 It is a diagram of the energy storage air conditioner provided by the present utility model under the working condition of the heat release mode of the energy storage tank.

[0030] 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 of the Embodiment

[0031] The present utility model will be further described in detail with reference to the accompanying drawings and specific embodiments.

[0032] An energy storage air conditioner includes a compressor 1, an indoor heat exchanger 4, an expansion valve 7, and an outdoor heat exchanger 8, and further includes a first four-way valve 2, an energy storage tank 3, a refrigerant pump 5, a second four-way valve 6, and first control valves V1, second control valves V2, third control valves V3, fourth control valves V4, fifth control valves V5, and sixth control valves V6.

[0033] 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 through the first four-way valve 2, and the compressor 1 is connected to the sixth control valve V6 through the first compressor 1.

[0034] The first control valve V1, the energy storage tank 3, and the third control valve V3 are connected in series and are 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.

[0035] The first control valve V1, the energy storage tank 3, and the third control valve V3 are connected in series and are in parallel with the second control valve V2, the indoor heat exchanger 4, and the fourth control valve V4.

[0036] The refrigerant pump 5 is connected to the second control valve V2 through the second four-way valve 6, the refrigerant pump 5 is connected to the fifth control valve V5 through the second four-way valve 6, and the fifth control valve V5 is connected to the energy storage tank 3.

[0037] In addition, some conventional auxiliary devices are also included, such as a liquid storage tank, a gas-liquid separator, etc. In addition, a control system is also included 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.

[0038] The energy storage air conditioner provided by the present utility model can store the cooling capacity in the energy storage tank 3 during the low electricity period at night in summer through the switching of the refrigerant pipeline. During the peak electricity price period during the day, the refrigerant pump 5 circulates to release the cooling capacity in the energy storage tank 3 for cooling; during the low electricity period at night in winter, the heat pump system or electric auxiliary heating can be used to store the heat in the energy storage tank 3. During the peak electricity price period during the day, the refrigerant pump 5 circulates to release the heat in the energy storage tank 3 for heating.

[0039] In this embodiment, the port a of the first four-way valve 2 is connected to the sixth control valve V6, the ports b and d of the first four-way valve 2 are respectively connected to the compressor 1, and the port c of the first four-way valve 2 is connected to the outdoor heat exchanger 8.

[0040] In this embodiment, port a of the second four-way valve 6 is communicated with the fifth control valve V5, ports b and d of the second four-way valve 6 are respectively communicated with the refrigerant pump 5, and port c of the second four-way valve 6 is communicated with the second control valve V2.

[0041] In this embodiment, the energy storage tank 3 is composed of a heat preservation housing, a heat exchange coil pipe located inside the heat preservation housing, an energy storage medium located inside the heat preservation housing, and several sensors.

[0042] In this embodiment, the energy storage medium is water. In summer, the latent heat of water freezing is mainly used for energy storage, and in winter, the sensible heat of water temperature rise is mainly used for energy storage. In other embodiments, other phase change materials can also be used.

[0043] In this embodiment, the sensors are temperature sensors, pressure sensors, and liquid level sensors;

[0044] The pressure sensor and the temperature sensor are arranged at the inlet and outlet of the heat exchange coil pipe;

[0045] The liquid level sensor is arranged on the inner side wall of the heat preservation housing or the inner side of the top of the heat preservation housing.

[0046] Specifically, the above energy storage air conditioner performs condition control in the following manner:

[0047] Table 1 Control Table for Different Operating Modes

[0048] Operation mode Refrigeration Heating Cool storage Heat storage Cool release 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 Heat storage Stop Stop First four-way valve a-d, b-c c-d, b-a a-d, b-c c-d, b-a / / Second four-way valve / / / / a-d, b-c c-d, b-a Control valve V1 Closed Closed Open Open Closed Closed Control valve V2 Open Open Closed Closed Open Open Control valve V3 Closed Closed Open Open Open Open Control valve V4 Open Open Closed Closed Open Open Control valve V5 Closed Closed Closed Closed Open Open Control valve V6 Open Open Open Open Closed Closed

[0049] Refrigeration mode condition: The high-temperature and high-pressure refrigerant gas at the compressor outlet enters the outdoor heat exchanger through the first four-way valve (b-c), condenses into a medium-temperature and high-pressure refrigerant liquid in the outdoor heat exchanger, becomes a 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 a low-temperature refrigerant gas, passes through the control valve V4 and then returns to the compressor through the first four-way valve (a-d). In the compressor, the refrigerant is compressed into a high-temperature and high-pressure gas.

[0050] Cool storage mode condition: The high-temperature and high-pressure refrigerant gas at the compressor outlet enters the outdoor heat exchanger through the first four-way valve (b-c), condenses into a medium-temperature and high-pressure refrigerant liquid in the outdoor heat exchanger, becomes a low-temperature and low-pressure refrigerant through the expansion valve, enters the energy storage tank through the control valve V1, and the refrigerant in the heat exchange coil pipe in the energy storage tank absorbs the heat of the energy storage medium water in the energy storage tank to freeze the water. The refrigerant evaporates into a low-temperature refrigerant gas, passes through the control valve V3 and then returns to the compressor through the first four-way valve (a-d). In the compressor, the refrigerant is compressed into a high-temperature and high-pressure gas.

[0051] Heating mode operating condition: The high-temperature and high-pressure refrigerant gas at the compressor outlet passes through the first four-way valve (b-a), enters the indoor heat exchanger through the control valve V4. In the air-conditioned room, the refrigerant in the indoor heat exchanger releases heat to raise the temperature of the air-conditioned room, and the refrigerant condenses into a medium-temperature and high-pressure refrigerant liquid. Then it 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, and the refrigerant evaporates into a low-temperature refrigerant gas and returns to the compressor through the first four-way valve (c-d). In the compressor, the refrigerant is compressed into a high-temperature and high-pressure gas.

[0052] Heat storage mode operating condition: The high-temperature and high-pressure refrigerant gas at the compressor outlet passes through the first four-way valve (b-a) and enters the heat storage tank through the control valve V3. In the heat storage tank, the refrigerant releases heat to heat the heat storage medium water in the heat storage tank, and condenses into a medium-temperature and high-pressure refrigerant liquid. Then it passes through the control valve V1 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, and the refrigerant evaporates into a low-temperature refrigerant gas and returns to the compressor through the first four-way valve (c-d). In the compressor, the refrigerant is compressed into a high-temperature and high-pressure gas.

[0053] Heat storage tank cold release mode operating condition: The low-temperature and low-pressure refrigerant liquid in the heat storage tank passes through the control valve V5, then through the second four-way valve (a-d), through the refrigerant pump, then through the second four-way valve (b-c), 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 heat from the room to cool the room, and the refrigerant evaporates into a low-temperature refrigerant gas and returns to the heat storage tank through the control valve V4 and the control valve V3. The heat storage medium ice in the heat storage tank melts to release cold energy to condense the low-temperature refrigerant gas into a low-temperature refrigerant liquid.

[0054] Heat storage tank heat release mode operating condition: The medium-temperature and medium-pressure refrigerant liquid in the indoor heat exchanger passes through the control valve V2, the second four-way valve (c-d), the refrigerant pump, the second four-way valve (b-a), and enters the heat storage tank through the control valve V5. In the heat storage tank, the refrigerant in the coil absorbs heat from the heat storage medium water in the heat storage tank, and the refrigerant evaporates into a 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 raise the temperature of the air-conditioned room, and the refrigerant gas condenses into a medium-temperature refrigerant liquid.

[0055] The above specific embodiments are used to explain the present invention, and are only the preferred embodiments of the present invention, rather than limiting the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and protection scope of the claims of the present invention 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.

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