Solar thermal storage multi-split air conditioning system

Abstract

This utility model belongs to the field of air conditioning technology, specifically relating to a solar-powered multi-split air conditioning system with thermal storage. It includes a solar collector, a thermal storage device, a compressor, an expansion valve, an air-cooled evaporator, a temperature detection device, a multi-split outdoor unit, a multi-split indoor unit, a first electric regulating valve, a second electric regulating valve, a third electric regulating valve, and a fourth electric regulating valve. The solar collector and the thermal storage device are connected via a closed-loop heat transfer pipeline. The solar radiation absorbed by the solar collector is transferred to the thermal storage device via a heat-conducting medium. The thermal storage device stores heat by transferring heat from the heat-absorbing medium to the internal thermal storage medium through indirect heat exchange. In use, the temperature detection device, linked to the electric regulating valves, monitors the temperature of the air-cooled evaporator in real time, precisely adjusting the refrigerant flow rate. This prevents the outdoor unit from frosting and freezing under low-temperature conditions, ensuring continuous and efficient heat exchange by the heat exchanger and improving system energy efficiency.

Description

Technical Field

[0001] This utility model belongs to the field of air conditioning technology, specifically, it relates to a solar-powered multi-split air conditioning system with thermal storage. Background Technology

[0002] In low-temperature winter conditions, traditional multi-split air conditioner outdoor units are prone to frost and freezing, severely affecting heat exchanger efficiency and system energy efficiency, leading to large indoor temperature fluctuations and poor heating comfort. Existing defrosting methods mainly include:

[0003] Four-way reversing valve reverse cycle defrosting: defrosting is achieved by switching the refrigerant flow direction, but the system switches to cooling mode during defrosting, resulting in heating interruption and affecting indoor comfort.

[0004] Hot gas bypass defrosting: Bypassing the high-temperature refrigerant discharged from the compressor to the outdoor evaporator can maintain the continuity of heating, but the defrosting speed is slow and it will reduce the indoor heating.

[0005] Furthermore, the uncontrolled discharge of defrosting water from outdoor units can easily cause dripping in winter, affecting the building's appearance and posing a safety hazard to residents. Current technologies struggle to efficiently solve the frosting problem while ensuring heating stability, and they also fail to adequately utilize renewable energy sources. Utility Model Content

[0006] In view of the deficiencies in the existing technology, the purpose of this utility model is to provide a solar thermal storage multi-split air conditioning system.

[0007] According to the present invention, a solar thermal storage multi-split air conditioning system includes a solar thermal collector, a thermal storage device, a compressor, an expansion valve, an air-cooled evaporator, a temperature detection device, a multi-split outdoor unit, a multi-split indoor unit, a first electric regulating valve, a second electric regulating valve, a third electric regulating valve, and a fourth electric regulating valve.

[0008] The solar collector and the heat storage device are connected by a closed-loop heat transfer pipeline. The solar radiation heat absorbed by the solar collector is transferred to the heat storage device through a heat transfer medium. The heat storage device transfers the heat of the heat-absorbing medium to the internal heat storage medium through indirect heat exchange to achieve heat storage and provide heat backup for the air conditioning system.

[0009] The outdoor unit of the multi-split air conditioner integrates a compressor, expansion valve, air-cooled evaporator, temperature detection device, first electric regulating valve, second electric regulating valve, third electric regulating valve and fourth electric regulating valve, and the components are connected by refrigerant pipes.

[0010] The indoor unit of the multi-split system is connected to the outdoor unit of the multi-split system through refrigerant pipes to form a "one-to-many" structure. The indoor unit of the multi-split system forms a closed loop with the compressor and expansion valve of the outdoor unit of the multi-split system through gas pipes and liquid pipes.

[0011] In a preferred embodiment, the solar thermal collector can be replaced by a low-temperature heat source such as industrial waste heat, sewage waste heat, or condensation waste heat from a refrigeration system. Low-temperature hot water can be prepared by setting up a small-capacity, ultra-low temperature air-cooled heat pump unit as a backup heat source for the heat storage device, thus meeting the requirements of multi-split units for non-frost and continuous heating.

[0012] In a preferred embodiment, the heat storage device and the multi-split outdoor unit are designed as an integrated or separate unit to suit different usage scenarios.

[0013] In a preferred embodiment: the heat storage device contains a heat exchange coil, which indirectly exchanges heat with the refrigerant pipes of the multi-split outdoor unit.

[0014] In a preferred embodiment: the heat storage device is filled with a heat storage medium, which includes water, ethylene glycol solution or phase change heat storage material.

[0015] In a preferred embodiment: the two ends of the air-cooled evaporator are connected to the expansion valve outlet and the compressor suction port respectively through refrigerant pipes. The air-cooled evaporator is equipped with a first electric regulating valve and a second electric regulating valve. The first electric regulating valve is installed in the main refrigerant flow channel between the expansion valve and the air-cooled evaporator, and the second electric regulating valve is installed in the bypass flow channel between the expansion valve and the heat storage device.

[0016] In a preferred embodiment: the temperature detection device is disposed on the surface of the air-cooled evaporator to provide real-time temperature data, and the temperature detection device serves as the basis for the opening degree of the first electric regulating valve and the second electric regulating valve.

[0017] In a preferred embodiment: the expansion valve is connected in series in the refrigerant pipeline. The expansion valve is located downstream of the compressor and upstream of the air-cooled evaporator. It is used to reduce the pressure of the refrigerant and throttle it, so as to provide conditions for the air-cooled evaporator to absorb heat.

[0018] In a preferred embodiment: the pipe from the compressor to the indoor unit of the multi-split air conditioner is equipped with a fourth electric regulating valve, and the pipe from the compressor to the outdoor unit is equipped with a third electric regulating valve, which can be connected to the heat exchange coil of the heat storage device to achieve supplemental heating of the heat storage medium.

[0019] In a preferred embodiment: the indoor unit of the multi-split system is connected to the outdoor unit of the multi-split system via refrigerant pipes, and can be flexibly added or removed to adapt to different spaces.

[0020] Compared with the prior art, the present invention has the following beneficial effects:

[0021] When in use, this utility model uses a temperature detection device linked with an electric regulating valve to monitor the temperature of the air-cooled evaporator in real time and precisely adjust the refrigerant flow. This fundamentally prevents the outdoor unit from frosting and freezing under low-temperature conditions, ensuring continuous and efficient heat exchange of the heat exchanger and improving system energy efficiency. At the same time, it eliminates the need to rely on traditional defrosting methods, thus preventing heating interruptions and heat loss during defrosting, ensuring stable indoor temperature, improving heating comfort, and eliminating the impact of unorganized defrosting water discharge on building appearance and personnel safety.

[0022] When in use, this utility model utilizes renewable energy sources such as solar energy and industrial waste heat for heating, and stores heat through a heat storage device, reducing dependence on traditional energy sources and achieving efficient energy utilization. Combined with the integrated design and intelligent control of the system, it further improves the overall performance of multi-split air conditioners in winter conditions and makes up for the shortcomings of existing technologies in the insufficient utilization of renewable energy. Attached Figure Description

[0023] Other features, objects, and advantages of this invention will become more apparent from the following detailed description of non-limiting embodiments with reference to the accompanying drawings:

[0024] Figure 1 This is a schematic diagram of the structure of this utility model;

[0025] Detailed Implementation

[0026] The present invention will now be described in detail with reference to specific embodiments. These embodiments will help those skilled in the art to further understand the present invention, but do not limit the present invention in any way. It should be noted that those skilled in the art can make several changes and improvements without departing from the concept of the present invention. These all fall within the protection scope of the present invention.

[0027] In the description of this application, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0028] like Figure 1As shown, this utility model discloses a solar thermal storage multi-split air conditioning system, including a solar thermal collector 1, a thermal storage device 2, a compressor 3, an expansion valve 4, an air-cooled evaporator 5, a temperature detection device 6, a multi-split outdoor unit 7, a multi-split indoor unit 8, a first electric regulating valve 9, a second electric regulating valve 10, a third electric regulating valve 11, and a fourth electric regulating valve 12.

[0029] The solar collector 1 and the heat storage device 2 are connected by a closed-loop heat transfer pipeline. The solar radiation heat absorbed by the solar collector 1 is transferred to the heat storage device 2 through a heat transfer medium. The heat storage device 2 transfers the heat of the heat absorption medium to the internal heat storage medium through indirect heat exchange to store heat and provide backup energy for the air conditioning system. The solar collector 1 can be replaced by a low-temperature heat source such as industrial waste heat, sewage waste heat or condensation waste heat from the refrigeration system. Low-temperature hot water can be prepared by setting up a small-capacity, ultra-low temperature air-cooled heat pump unit as a backup heat source for the heat storage device 2 to meet the requirements of multi-split systems for non-frost and continuous heating.

[0030] The heat storage device 2 and the multi-split outdoor unit 7 are designed as an integrated or separate unit to suit different usage scenarios. The heat storage device 2 is filled with a heat storage medium, which may include water, ethylene glycol solution or phase change heat storage material. The heat storage device 2 contains a heat exchange coil, which exchanges heat indirectly with the refrigerant pipes of the multi-split outdoor unit 7.

[0031] The multi-split outdoor unit 7 includes a compressor 3, an expansion valve 4, an air-cooled evaporator 5, a temperature detection device 6, a first electric regulating valve 9, a second electric regulating valve 10, a third electric regulating valve 11, and a fourth electric regulating valve 12. All components are connected by refrigerant pipes.

[0032] The air-cooled evaporator 5 is connected to the outlet of the expansion valve 4 and the suction port of the compressor 3 through refrigerant pipes at both ends. The air-cooled evaporator 5 is equipped with a first electric regulating valve 9 and a second electric regulating valve 10. The first electric regulating valve 9 is installed in the main refrigerant flow channel between the expansion valve 4 and the air-cooled evaporator 5, and the second electric regulating valve 10 is installed in the bypass flow channel between the expansion valve 4 and the heat storage device 2. The temperature detection device 6 is set on the surface of the air-cooled evaporator 5 to provide real-time temperature data. The temperature detection device 6 serves as the basis for the opening degree of the first electric regulating valve 9 and the second electric regulating valve 10.

[0033] Expansion valve 4 is connected in series with the refrigerant pipeline. Expansion valve 4 is located downstream of compressor 3 and upstream of air-cooled evaporator 5. It reduces the pressure and throttles the refrigerant to prepare for heat absorption by air-cooled evaporator 5. The pipeline from compressor 3 to multi-split indoor unit 8 is equipped with a fourth electric regulating valve 12. The pipeline from compressor 3 to outdoor heat exchange is equipped with a third electric regulating valve 11, which can be connected to the heat exchange coil of heat storage device 2 to achieve heat replenishment of the heat storage medium.

[0034] As the terminal equipment of the system, the multi-split indoor unit 8 is connected to the multi-split outdoor unit 7 through refrigerant pipes to form a "one-to-many" structure, which can be flexibly added or removed to adapt to different spaces. The multi-split indoor unit 8 forms a closed loop with the compressor 3 and expansion valve 4 of the multi-split outdoor unit 7 through gas pipes and liquid pipes to realize the circulation of refrigerant, receive temperature commands and provide feedback on the operating status.

[0035] Working principle

[0036] In use, the solar collector 1 absorbs heat to heat the heat transfer medium and transfers it to the heat storage device 2 for storage. During winter heating, the high-temperature and high-pressure gaseous refrigerant discharged by the compressor 3 becomes liquid after releasing heat through the indoor unit. It is then depressurized by the expansion valve 4. The temperature detection device 6 monitors the surface temperature of the air-cooled evaporator 5 and automatically adjusts the electric regulating valve to allow some of the low-temperature and low-pressure liquid refrigerant to enter the air-cooled evaporator 5 to absorb heat from the outdoor air, controlling the flow rate and preventing frost. The other part enters the heat storage device 2 to absorb heat from the heat storage medium. The two parts of gaseous refrigerant are then combined and drawn into the compressor 3 for circulation. When the temperature of the heat storage medium is insufficient, the electric regulating valve is adjusted to allow some of the high-temperature and high-pressure gaseous refrigerant to enter the heat storage device 2 for supplemental heating. In addition, the system can be connected to low-temperature heat sources such as industrial waste heat or configured with a backup heat source. In summer, cooling is achieved by switching through a four-way reversing valve. Efficient anti-frost heating is achieved through dual heat source synergy, intelligent flow control, and multi-energy coupling.

[0037] The specific embodiments of this utility model have been described above. It should be understood that this utility model is not limited to the specific embodiments described above, and those skilled in the art can make various changes or modifications within the scope of the claims, which do not affect the substantive content of this utility model. Unless otherwise specified, the embodiments and features described in this application can be arbitrarily combined with each other.

Claims

1. A solar-powered multi-split air conditioning system with thermal storage, characterized in that, It includes a solar thermal collector (1), a thermal storage device (2), a compressor (3), an expansion valve (4), an air-cooled evaporator (5), a temperature detection device (6), a multi-split outdoor unit (7), a multi-split indoor unit (8), a first electric regulating valve (9), a second electric regulating valve (10), a third electric regulating valve (11), and a fourth electric regulating valve (12). The solar collector (1) and the heat storage device (2) are connected by a closed-loop heat transfer pipeline. The solar radiation heat absorbed by the solar collector (1) is transferred to the heat storage device (2) through the heat transfer medium. The heat storage device (2) transfers the heat of the heat-absorbing medium to the internal heat storage medium through indirect heat exchange to achieve heat storage and provide heat for the air conditioning system. The multi-split outdoor unit (7) integrates a compressor (3), an expansion valve (4), an air-cooled evaporator (5), a temperature detection device (6), a first electric regulating valve (9), a second electric regulating valve (10), a third electric regulating valve (11), and a fourth electric regulating valve (12), and each component is connected through a refrigerant pipeline. The indoor unit (8) of the multi-split system is connected to the outdoor unit (7) of the multi-split system through a refrigerant pipe to form a "one-to-many" structure. The indoor unit (8) of the multi-split system is connected to the compressor (3) and expansion valve (4) of the outdoor unit (7) of the multi-split system through gas pipe and liquid pipe to form a closed loop.

2. The solar thermal storage multi-split air conditioning system according to claim 1, characterized in that, The solar thermal collector (1) can be replaced by a low-temperature heat source such as industrial waste heat, sewage waste heat or condensation waste heat from a refrigeration system. Low-temperature hot water can be prepared by setting up a small-capacity, ultra-low temperature air-cooled heat pump unit as a backup heat source for the heat storage device (2) to meet the requirements of multi-split units without frost and continuous heating.

3. The solar thermal storage multi-split air conditioning system according to claim 1, characterized in that, The heat storage device (2) and the multi-split outdoor unit (7) are designed as an integrated or separate unit to suit different usage scenarios.

4. The solar thermal storage multi-split air conditioning system according to claim 3, characterized in that, The heat storage device (2) contains a heat exchange coil, which indirectly exchanges heat with the refrigerant pipe of the multi-split outdoor unit (7).

5. The solar thermal storage multi-split air conditioning system according to claim 4, characterized in that, The heat storage device (2) is filled with a heat storage medium, which includes water, ethylene glycol solution or phase change heat storage material.

6. The solar thermal storage multi-split air conditioning system according to claim 1, characterized in that, The air-cooled evaporator (5) is connected at both ends to the outlet of the expansion valve (4) and the suction port of the compressor (3) through refrigerant pipes. The air-cooled evaporator (5) is equipped with a first electric regulating valve (9) and a second electric regulating valve (10). The first electric regulating valve (9) is installed in the main refrigerant flow channel between the expansion valve (4) and the air-cooled evaporator (5), and the second electric regulating valve (10) is installed in the bypass flow channel between the expansion valve (4) and the heat storage device (2).

7. The solar thermal storage multi-split air conditioning system according to claim 6, characterized in that, The temperature detection device (6) is installed on the surface of the air-cooled evaporator (5) to provide real-time temperature data. The temperature detection device (6) serves as the basis for the opening degree of the first electric regulating valve (9) and the second electric regulating valve (10).

8. The solar thermal storage multi-split air conditioning system according to claim 1, characterized in that, The expansion valve (4) is connected in series with the refrigerant pipeline. The expansion valve (4) is located downstream of the compressor (3) and upstream of the air-cooled evaporator (5). It is used to reduce the pressure of the refrigerant and throttle it to provide conditions for the air-cooled evaporator (5) to absorb heat.

9. The solar thermal storage multi-split air conditioning system according to claim 1, characterized in that, The pipe from the compressor (3) to the indoor unit (8) of the multi-split system is equipped with a fourth electric regulating valve (12), and the pipe from the compressor (3) to the outdoor heat exchanger is equipped with a third electric regulating valve (11), which can be connected to the heat exchange coil of the heat storage device (2) to achieve heat replenishment of the heat storage medium.

10. The solar thermal storage multi-split air conditioning system according to claim 9, characterized in that, The indoor unit (8) of the multi-split system is connected to the outdoor unit (7) of the multi-split system through a refrigerant pipe, and can be flexibly added or removed to adapt to different spaces.

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