A phase change solar wall assisted air source heat pump system and indoor heating method

Abstract

The application discloses a phase change solar wall assisted air source heat pump system and an indoor heating method, which comprises a heat pump unit and a phase change solar wall auxiliary unit. The heat pump unit is composed of a compressor, an outdoor air heat exchanger, an indoor air heat exchanger, a phase change wall built-in evaporator, a first throttling component, a second throtting component, a flash vapor separator, a first gas-liquid separator, a second gas-liquid separator, a first electric control valve and a second electric control valve. The phase change solar wall auxiliary unit is composed of a glass cover plate, an air sandwich, a phase change heat storage wall, a solar heat collecting and absorbing plate, a first air valve, a second air valve, a third air valve, a fourth air valve and a sunshade roller shutter. The application realizes single-stage compression heat pump circulation or double-stage compression heat pump circulation by using one compressor, and utilizes low-grade heat energy at different temperatures in stages, thereby improving the energy efficiency ratio of the air source heat pump and saving high-grade electric energy. The application realizes passive and active coupling utilization of solar energy and improves the utilization efficiency of solar energy.

Description

TECHNICAL FIELD

[0001] The present application relates to a heat pump system, in particular to an air source heat pump system assisted by a phase change solar wall. BACKGROUND

[0002] Due to the small solar energy flow density, the intensity of solar radiation is greatly affected by factors such as season, region, weather, orientation, etc., and has the characteristics of volatility and intermittency. The temperature control of traditional solar wall heating and ventilation is poor, and the room temperature of the solar wall passive solar house fluctuates greatly throughout the day. With the improvement of the heat storage system, such as the solar wall with a phase change layer, the room temperature has been improved to some extent, but the room temperature change cannot always reach the stable state of the active solar system, and even the day and night temperature fluctuation phenomenon occurs.

[0003] In order to ensure the all-weather indoor thermal comfort of the solar wall passive solar house, other heat source equipment such as air source heat pump is often needed. Air source heat pump is widely used because of its wide application range, low operating cost, outstanding energy saving effect, easy installation and other advantages, but it also has the disadvantages of being easily affected by outdoor climate change, easy to frost, poor performance when the outdoor air temperature is low, and insufficient heating capacity. Therefore, in cold regions, the performance of air source heat pump decreases sharply or even cannot start running.

[0004] Based on the above, how to overcome the shortcomings of both, improve the utilization efficiency of solar energy and the energy efficiency ratio of air source heat pump in cold climate conditions, and improve the all-weather thermal comfort of the solar wall passive solar house, has become a technical problem that the industry is concerned about and expects to solve. SUMMARY

[0005] The purpose of the present application is to provide a phase change solar wall assisted air source heat pump system and an indoor heating method, which can realize the passive and active coupling utilization of solar energy, improve the utilization efficiency of solar energy and the energy efficiency of air source heat pump, and meet the all-weather thermal comfort requirements of the solar wall passive solar house.

[0006] In order to achieve the above object, the application adopts the following technical scheme: the phase change solar wall assisted air source heat pump system comprises a heat pump unit and a phase change solar wall assisted unit; the heat pump unit is composed of a compressor 1, an outdoor air heat exchanger 2, an indoor air heat exchanger 3, a phase change wall built-in evaporator 4, a first throttling component 5a, a second throttling component 5b, a flash vapor separator 6, a first gas-liquid separator 7a, a second gas-liquid separator 7b, a first electric control valve 8a and a second electric control valve 8b; the compressor 1 is provided with an exhaust port, a high-pressure suction port and a low-pressure suction port; the exhaust port of the compressor 1 is connected with the refrigerant inlet of the indoor air heat exchanger 3; the refrigerant outlet of the indoor air heat exchanger 3, the first throttling component 5a and the inlet of the flash vapor separator 6 are sequentially connected in series; the flash vapor separator 6 is further provided with a gaseous refrigerant outlet and a liquid refrigerant outlet; the gaseous refrigerant outlet of the flash vapor separator 6 is connected with the high-pressure suction port of the compressor through the second gas-liquid separator 7b; the liquid refrigerant outlet of the flash vapor separator 6 is divided into two branches; one branch is connected with the refrigerant inlet of the phase change wall built-in evaporator 4 through the second electric control valve 8b; the refrigerant outlet of the phase change wall built-in evaporator 4 is connected with the high-pressure suction port of the compressor 1 through the second gas-liquid separator 7b; the other branch is connected with the inlet of the second throttling component 5b; the outlet of the second throttling component 5b, the first electric control valve 8a, the outdoor air heat exchanger 2, the first gas-liquid separator 7a and the low-pressure suction port of the compressor 1 are sequentially connected in series; the phase change solar wall assisted unit is composed of a glass cover plate 9, an air sandwich layer 10, a phase change heat storage wall 11, a solar heat collecting and absorbing plate 12, a first air valve 13a, a second air valve 13b, a third air valve 13c, a fourth air valve 13d and a sunshade roller shutter 14.

[0007] The phase change heat storage wall 11 is composed of the solar heat collecting and absorbing plate 12, a load-bearing block layer 11a, a phase change layer 11b and an insulation layer 11c; the phase change wall built-in evaporator 4 is a single-row or multi-row copper pipe or stainless steel heat exchange pipe, the outer pipe is provided with an integral aluminum fin or a stainless steel fin, and is embedded in the phase change layer 11b of the phase change heat storage wall 11.

[0008] The phase change material is an organic phase change material without corrosion to the copper pipe or the stainless steel pipe at a phase change temperature in the range of 10-30℃, and includes paraffin and polyethylene glycol.

[0009] The working medium of the heat pump unit is one of HFC or HC refrigerants such as R22, R134a, R1234yf, R152a and R290; the first throttling component 5a and the second throttling component 5b are any one of a capillary tube, a thermal expansion valve and an electronic expansion valve.

[0010] The first temperature sensor 15a is arranged in the room, and the second temperature sensor 15b is arranged at the center of the inner surface of the phase-change heat storage wall 11. The electrical signal output ends of the first temperature sensor 15a and the second temperature sensor 15b are connected to the control box 16, and the control box 16 is also connected to the electrical signal lines of the first electric control valve 8a, the second electric control valve 8b, the first air valve 13a, the second air valve 13b, the third air valve 13c, the fourth air valve 13d and the compressor 1.

[0011] The indoor heating method of the phase-change solar wall assisted air source heat pump system is as follows: the phase-change solar wall assisted air source heat pump system provides the required indoor heating capacity in the natural ventilation mode or the heat pump circulation heating mode. When there is solar radiation, the first air valve 13a and the second air valve 13b are closed, and the third air valve 13c and the fourth air valve 13d are opened, so that the chimney effect of the phase-change solar wall forms natural ventilation to heat the indoor air, thereby meeting the indoor thermal comfort requirement. When the phase-change solar wall cannot meet the indoor thermal comfort requirement in the natural ventilation mode, the first air valve 13a, the second air valve 13b, the third air valve 13c, the fourth air valve 13d and the first electric control valve 8a are closed, and the second electric control valve 8b is opened, so that the phase-change solar wall heat pump system composed of the compressor 1, the indoor air heat exchanger 3, the phase-change wall built-in evaporator 4, the first throttling component 5a, the flash vapor separator 6, the second gas-liquid separator 7b and the second electric control valve 8b works in the single-stage compression heat pump circulation mode to provide the required indoor heating capacity. When the phase-change solar wall heat pump system cannot meet the indoor thermal comfort requirement in the single-stage compression heat pump circulation mode, the first air valve 13a, the second air valve 13b, the third air valve 13c and the fourth air valve 13d are closed, and the first electric control valve 8a and the second electric control valve 8b are opened, so that the phase-change solar wall heat pump composed of the compressor 1, the indoor air heat exchanger 3, the phase-change wall built-in evaporator 4, the first throttling component 5a, the flash vapor separator 6, the second gas-liquid separator 7b and the second electric control valve 8b works in the high-pressure stage compression heat pump circulation mode, and the air source heat pump composed of the compressor 1, the outdoor air heat exchanger 2, the indoor air heat exchanger 3, the first throttling component 5a, the second throttling component 5b, the flash vapor separator 6, the first gas-liquid separator 7a and the first electric control valve 8a works in the low-pressure stage compression heat pump circulation mode, and the two work together to provide the required indoor heating capacity. When the inner surface temperature of the phase-change heat storage wall is lower than the indoor air temperature, the second electric control valve 8b is closed, and the first electric control valve 8a is opened, so that the air source heat pump composed of the compressor 1, the outdoor air heat exchanger 2, the indoor air heat exchanger 3, the first throttling component 5a, the second throttling component 5b, the flash vapor separator 6, the first gas-liquid separator 7a and the second gas-liquid separator 7b works in the intermediate air supplementing two-stage compression heat pump circulation heating mode to provide the required indoor heating capacity.

[0012] The present application has the advantages that: the present application provides required heat for the indoor by the conversion of the phase change solar wall natural ventilation mode and the heat pump cycle heating mode, realizes the passive and active coupling utilization of the solar energy, and improves the utilization efficiency of the solar energy; a single-stage compression heat pump cycle or a two-stage compression heat pump cycle is realized by using one compressor, different temperature low-grade heat energy is utilized in stages, and the energy efficiency ratio of the air source heat pump is improved, the cost and high-grade electric energy are saved; the phase change wall is arranged to store the latent heat or sensible heat converted from the solar energy, so that the air source heat pump system assisted by the phase change solar wall in the heating mode can work continuously and efficiently at night or on cloudy days, and the problem of insufficient heating of the air source heat pump in a low-temperature environment is solved. BRIEF DESCRIPTION OF DRAWINGS

[0013] Figure 1 is a structural principle diagram of a phase change solar wall assisted air source heat pump system of the present application.

[0014] Figure 1 The hollow arrows in the figure indicate the flow direction of the refrigerant in the pipes connected between the parts of the system.

[0015] The reference signs are as follows: 1-compressor, 2-outdoor air heat exchanger, 3-indoor air heat exchanger, 4-phase change wall built-in evaporator, 5a-first throttling component, 5b-second throttling component, 6-flash vapor separator, 7a-first gas-liquid separator, 7b-second gas-liquid separator, 8a-first electric control valve, 8b-second electric control valve, 9-glass cover plate, 10-air sandwich, 11-phase change heat storage wall, 12-solar heat collecting and absorbing plate, 13a-first air valve, 13b-second air valve, 13c-third air valve, 13d-fourth air valve, 14-sunshade roller shutter, 15a-first temperature sensor, 15b-second temperature sensor, 16-control box. DETAILED DESCRIPTION

[0016] The present application is specifically described below in combination with the embodiments, and it is necessary to point out here that the embodiments are only used for further explanation and illustration of the present application, and cannot be understood as the limitation of the protection scope of the present application, and the skilled in the art can make some non-essential improvements and adjustments according to the content of the above-mentioned application.

[0017] The specific embodiment of the present application is:

[0018] A phase change solar wall assisted air source heat pump system comprises a heat pump unit and a phase change solar wall assisted unit, the heat pump unit is composed of a compressor 1, an outdoor air heat exchanger 2, an indoor air heat exchanger 3, a phase change wall built-in evaporator 4, a first throttling component 5a, a second throttling component 5b, a flash vapor separator 6, a first gas-liquid separator 7a, a second gas-liquid separator 7b, a first electric control valve 8a, and a second electric control valve 8b. The compressor 1 is provided with an exhaust port, a high-pressure suction port, and a low-pressure suction port. The exhaust port of the compressor 1 is connected with the refrigerant inlet of the indoor air heat exchanger 3. The refrigerant outlet of the indoor air heat exchanger 3, the first throttling component 5a, and the inlet of the flash vapor separator 6 are sequentially connected in series. The flash vapor separator 6 is further provided with a gaseous refrigerant outlet and a liquid refrigerant outlet. The gaseous refrigerant outlet of the flash vapor separator 6 is connected with the high-pressure suction port of the compressor through the second gas-liquid separator 7b. The liquid refrigerant outlet of the flash vapor separator 6 is divided into two branches. One branch is connected with the refrigerant inlet of the phase change wall built-in evaporator 4 through the second electric control valve 8b. The refrigerant outlet of the phase change wall built-in evaporator 4 is connected with the high-pressure suction port of the compressor 1 through the second gas-liquid separator 7b. The other branch is connected with the inlet of the second throttling component 5b. The outlet of the second throttling component 5b, the first electric control valve 8a, the outdoor air heat exchanger 2, the first gas-liquid separator 7a, and the low-pressure suction port of the compressor 1 are sequentially connected in series. The first throttling component 5a and the second throttling component 5b are any one of a capillary tube, a thermal expansion valve, or an electronic expansion valve. The working medium of the heat pump unit is one of HFC or HC refrigerants such as R22, R134a, R1234yf, R152a, and R290.

[0019] The phase change solar wall assisted unit is composed of a glass cover plate 9, an air sandwich layer 10, a phase change heat storage wall 11, a solar heat collecting and absorbing plate 12, a first air valve 13a, a second air valve 13b, a third air valve 13c, a fourth air valve 13d, and a sunshade roller shutter 14. The phase change heat storage wall 11 is composed of the solar heat collecting and absorbing plate 12, a load-bearing block layer 11a, a phase change layer 11b, and an insulation layer 11c. The phase change wall built-in evaporator 4 is a single-row or multi-row copper pipe or stainless steel heat exchange pipe, which is covered with an integral aluminum fin or stainless steel fin and is embedded in the phase change layer 11b of the phase change heat storage wall 11.

[0020] The phase change material in the phase change layer 11b is an organic phase change material with no corrosion to copper pipes or stainless steel pipes at a phase change temperature in the range of 10℃ to 30℃, including paraffin and polyethylene glycol.

[0021] The first temperature sensor 15a is arranged indoors, and the second temperature sensor 15b is arranged at the center of the inner surface of the phase change heat storage wall 11. The electrical signal output ends of the first temperature sensor 15a and the second temperature sensor 15b are connected with the control box 16. The control box 16 is also connected with the electrical signal lines of the first electric control valve 8a, the second electric control valve 8b, the first air valve 13a, the second air valve 13b, the third air valve 13c, the fourth air valve 13d and the compressor 1.

[0022] In the present application, a working process of a phase change solar wall assisted air source heat pump system and an indoor heating method are as follows: the phase change solar wall assisted air source heat pump system provides indoor required heat in a phase change solar wall natural ventilation mode or a heat pump circulation heating mode. When there is solar radiation, the phase change solar wall natural ventilation mode heating is realized by opening the third air valve 13c and the fourth air valve 13d, closing the first air valve 13a and the second air valve 13b, and not starting the heat pump system. After the solar radiation through the glass cover plate 9 is absorbed by the solar heat collecting and absorbing plate 12, the temperature of the solar heat collecting and absorbing plate 12 rises. Part of the absorbed heat is transmitted along the phase change heat storage wall 11 and stored in the phase change heat storage wall 11, and part of the heat is used to heat indoor air entering the air layer 10 from the lower air outlet of the phase change heat storage wall 11. After the air in the air layer 10 absorbs the heat transmitted to it by the solar heat collecting and absorbing plate 12 through convective heat transfer, the temperature of the air rises, the density of the air decreases, and the hot air rises under the action of thermal buoyancy. The hot air enters the indoor air from the air outlet at the top of the phase change heat storage wall 11. At this time, only the chimney effect of the phase change solar wall is needed to form natural ventilation to heat the indoor air to meet the indoor thermal comfort requirement. When the phase change solar wall cannot meet the indoor thermal comfort requirement when it runs alone in the natural ventilation mode, that is, when the indoor air temperature detected by the first temperature sensor 15a is lower than the set temperature, the compressor 1 is started, the second electric control valve 8b is opened, the first air valve 13a, the second air valve 13b, the third air valve 13c, the fourth air valve 13d, and the first electric control valve 8a are closed, and the phase change solar wall heat pump system composed of the compressor 1, the indoor air heat exchanger 3, the phase change wall built-in evaporator 4, the first throttling component 5a, the flash vapor separator 6, the second gas-liquid separator 7b, and the second electric control valve 8b works in a single-stage compression heat pump circulation mode to heat, and independently provides the required heating amount of indoor air. At this time, most of the solar radiation absorbed by the solar heat collecting and absorbing plate 12 is transmitted along the phase change heat storage wall 11 and stored in the phase change heat storage wall 11, the temperature of the phase change heat storage wall 11 rises, and the high-temperature and high-pressure gaseous refrigerant at the outlet of the compressor 1 enters the indoor air heat exchanger 3 and then condenses and releases heat to the indoor air, and then becomes high-temperature and high-pressure liquid refrigerant. The liquid refrigerant is throttled and decompressed by the first throttling component 5a, becomes low-temperature and low-pressure wet vapor, and then enters the flash vapor separator 6. The liquid refrigerant separated from the flash vapor separator 6 absorbs the heat of the phase change heat storage wall 11 when passing through the phase change wall built-in evaporator 4, and then becomes gaseous. After the gaseous refrigerant separated from the flash vapor separator 6 is combined with the gaseous refrigerant, it enters the high-pressure suction port of the compressor 1 through the second gas-liquid separator 7b, and completes the single-stage compression heat pump circulation of the phase change solar wall.When the phase change solar wall heat pump system works in the single-stage compression heat pump cycle mode to heat and fails to meet the indoor thermal comfort requirement, i.e. when the indoor air temperature detected by the first temperature sensor 15a is lower than the set temperature, the first electric control valve 8a and the second electric control valve 8b are opened, and the first air valve 13a, the second air valve 13b, the third air valve 13c and the fourth air valve 13d are closed. The phase change solar wall heat pump composed of the compressor 1, the indoor air heat exchanger 3, the phase change wall built-in evaporator 4, the first throttling component 5a, the flash vapor separator 6, the second gas-liquid separator 7b and the second electric control valve 8b works in the high-pressure stage compression heat pump cycle mode to heat, and the air source heat pump composed of the compressor 1, the outdoor air heat exchanger 2, the indoor air heat exchanger 3, the first throttling component 5a, the second throttling component 5b, the flash vapor separator 6, the first gas-liquid separator 7a and the first electric control valve 8a works in the low-pressure stage compression heat pump cycle mode to heat. The two heat pumps work together to provide the required indoor heating capacity. At this time, most of the solar radiation absorbed by the solar heat absorption panel 12 is transferred along the phase change heat storage wall 11 and stored in the phase change heat storage wall 11, and the temperature of the phase change heat storage wall 11 rises. The high-temperature and high-pressure gaseous refrigerant at the outlet of the compressor 1 enters the indoor air heat exchanger 3 and then condenses and releases heat, which is transferred to the indoor air. Then the high-temperature and high-pressure gaseous refrigerant becomes high-temperature and high-pressure liquid refrigerant. The liquid refrigerant is throttled and decompressed by the first throttling component 5a to become low-temperature and low-pressure wet vapor, and then enters the flash vapor separator 6. Part of the liquid refrigerant separated from the flash vapor separator 6 absorbs the heat of the phase change wall through the phase change wall built-in evaporator 4 to become gaseous, and then combines with the gaseous refrigerant separated from the flash vapor separator 6 and enters the high-pressure suction port of the compressor 1. The other part of the liquid refrigerant separated from the flash vapor separator 6 is throttled and decompressed by the second throttling component 5b, absorbs the heat of the outdoor air through the outdoor air heat exchanger 2 to become gaseous, enters the low-pressure suction port of the compressor 1 through the first gas-liquid separator 7a, and completes the double-stage compression heat pump cycle.When the second temperature sensor 15b detects that the temperature of the inner surface of the phase change heat storage wall 11 is lower than the temperature of the indoor air, the first electric control valve 8a is opened, the second electric control valve 8b, the first air valve 13a, the second air valve 13b, the third air valve 13c, and the fourth air valve 13d are closed, and the air source heat pump composed of the compressor 1, the outdoor air heat exchanger 2, the indoor air heat exchanger 3, the first throttling component 5a, the second throttling component 5b, the flash vapor separator 6, the first gas-liquid separator 7a, the second gas-liquid separator 7b, and the first electric control valve 8a works in the intermediate charge two-stage compression heat pump cycle heating mode to provide the required heating capacity, at this time, the high-temperature and high-pressure gaseous refrigerant at the outlet of the compressor 1 enters the indoor air heat exchanger 3 after the condensation heat release, and then becomes high-temperature and high-pressure liquid refrigerant, the liquid refrigerant is throttled and decompressed by the first throttling component 5a to become low-temperature and low-pressure wet vapor, and then enters the flash vapor separator 6, the gaseous refrigerant separated from the flash vapor separator 6 enters the high-pressure suction port of the compressor through the second gas-liquid separator 7b, the liquid refrigerant separated from the flash vapor separator 6 is throttled and decompressed by the second throttling component 5b, and then becomes gaseous when absorbing the heat of the outdoor air through the outdoor air heat exchanger 2, enters the low-pressure suction port of the compressor through the first gas-liquid separator 7a, and completes the intermediate charge two-stage compression heat pump cycle.

[0023] The main features, use method, basic principles, and advantages of the present application are shown and described above. It should be understood by those skilled in the art that the present application is not limited by the above examples, the above examples and the description in the specification are only the principles of the present application, and various changes and improvements can be made according to the actual situation without departing from the spirit and scope of the present application, and these changes and improvements all fall within the scope of the present application. The scope of protection of the present application is defined by the appended claims and their equivalents.

Claims

1. A phase change solar wall assisted air source heat pump system, characterized in that: The phase change solar wall assisted air source heat pump system comprises a heat pump unit and a phase change solar wall auxiliary unit, and the heat pump unit is composed of a compressor (1), an outdoor air heat exchanger (2), an indoor air heat exchanger (3), a phase change wall built-in evaporator (4), a first throttling component (5a), a second throttling component (5b), a flash vapor separator (6), a first gas-liquid separator (7a), a second gas-liquid separator (7b), a first electric control valve (8a) and a second electric control valve (8b). The compressor (1) is provided with an exhaust port, a high-pressure suction port and a low-pressure suction port. The exhaust port of the compressor (1) is connected with a refrigerant inlet of the indoor air heat exchanger (3). The refrigerant outlet of the indoor air heat exchanger (3), the first throttling component (5a) and the inlet of the flash vapor separator (6) are sequentially connected in series. The flash vapor separator (6) is further provided with a gaseous refrigerant outlet and a liquid refrigerant outlet. The gaseous refrigerant outlet of the flash vapor separator (6) is connected with the high-pressure suction port of the compressor through the second gas-liquid separator (7b). The liquid refrigerant outlet of the flash vapor separator (6) is divided into two branches. One branch is connected with the refrigerant inlet of the phase change wall built-in evaporator (4) through the second electric control valve (8b). The refrigerant outlet of the phase change wall built-in evaporator (4) is connected with the high-pressure suction port of the compressor (1) through the second gas-liquid separator (7b). The other branch is connected with the inlet of the second throttling component (5b). The outlet of the second throttling component (5b), the first electric control valve (8a), the outdoor air heat exchanger (2), the first gas-liquid separator (7a) and the low-pressure suction port of the compressor (1) are sequentially connected in series. The phase change solar wall auxiliary unit is composed of a glass cover plate (9), an air sandwich layer (10), a phase change heat storage wall (11), a solar heat collecting and absorbing plate (12), a first air valve (13a), a second air valve (13b), a third air valve (13c), a fourth air valve (13d) and a sunshade roller shutter (14).

2. A phase change solar wall assisted air source heat pump system according to claim 1, wherein The phase change heat storage wall (11) is composed of the solar heat collecting and absorbing plate (12), a load-bearing block layer (11a), a phase change layer (11b) and an insulation layer (11c). The phase change wall built-in evaporator (4) is a single-row or multi-row copper pipe or stainless steel heat exchange pipe, which is provided with an integral aluminum fin or stainless steel fin outside the pipe and is embedded in the phase change layer (11b) of the phase change heat storage wall (11).

3. The phase change solar wall assisted air source heat pump system according to claim 1 or 2, characterized in that: The phase change solar wall adopts an organic phase change material with no corrosiveness to the copper pipe or stainless steel heat exchange pipe at a phase change temperature in the range of 10-30℃, including paraffin and polyethylene glycol.

4. The phase change solar wall assisted air source heat pump system of claim 1, wherein: The working medium of the heat pump unit is one of R22, R134a, R1234yf, R152a and R290 refrigerants.

5. The phase change solar wall assisted air source heat pump system of claim 1, wherein: The first throttling component (5a) and the second throttling component (5b) are any one of a capillary tube, a thermal expansion valve and an electronic expansion valve.

6. A phase change solar wall assisted air source heat pump system according to claim 1, wherein The first temperature sensor (15a) is arranged in the room, the second temperature sensor (15b) is arranged at the center of the inner surface of the phase change heat storage wall (11), the electrical signal output ends of the first temperature sensor (15a) and the second temperature sensor (15b) are connected with the control box (16), and the control box (16) is also connected with the electrical signal lines of the first electric control valve (8a), the second electric control valve (8b), the first air valve (13a), the second air valve (13b), the third air valve (13c), the fourth air valve (13d) and the compressor (1).

7. The method of claim 1, wherein the phase change solar wall assisted air source heat pump system is a system for heating a room. The phase change solar wall assisted air source heat pump system provides indoor heating in the phase change solar wall natural ventilation mode or the heat pump cycle heating mode; when there is solar radiation, the first air valve (13a) and the second air valve (13b) are closed, and the third air valve (13c) and the fourth air valve (13d) are opened, so that the chimney effect of the phase change solar wall forms natural ventilation to heat indoor air, thereby meeting the indoor thermal comfort requirement; when the phase change solar wall alone cannot meet the indoor thermal comfort requirement in the natural ventilation mode, the first air valve (13a), the second air valve (13b), the third air valve (13c), the fourth air valve (13d) and the first electric control valve (8a) are closed, and the second electric control valve (8b) is opened, so that the phase change solar wall heat pump system composed of the compressor (1), the indoor air heat exchanger (3), the phase change wall built-in evaporator (4), the first throttling component (5a), the flash vapor separator (6), the second gas-liquid separator (7b) and the second electric control valve (8b) works in the single-stage compression heat pump cycle mode to provide indoor heating; when the phase change solar wall heat pump system cannot meet the indoor thermal comfort requirement in the single-stage compression heat pump cycle mode, the first air valve (13a), the second air valve (13b), the third air valve (13c) and the fourth air valve (13d) are closed, and the first electric control valve (8a) and the second electric control valve (8b) are opened, so that the phase change solar wall heat pump composed of the compressor (1), the indoor air heat exchanger (3), the phase change wall built-in evaporator (4), the first throttling component (5a), the flash vapor separator (6), the second gas-liquid separator (7b) and the second electric control valve (8b) works in the high-pressure stage compression heat pump cycle mode to provide indoor heating, and the air source heat pump composed of the compressor (1), the outdoor air heat exchanger (2), the indoor air heat exchanger (3), the first throttling component (5a), the second throttling component (5b), the flash vapor separator (6), the first gas-liquid separator (7a) and the first electric control valve (8a) works in the low-pressure stage compression heat pump cycle mode to provide indoor heating, and the two work together to provide indoor heating; when the inner surface temperature of the phase change heat storage wall is lower than the indoor air temperature, the second electric control valve (8b) is closed, and the first electric control valve (8a) is opened, so that the air source heat pump composed of the compressor (1), the outdoor air heat exchanger (2), the indoor air heat exchanger (3), the first throttling component (5a), the second throttling component (5b), the flash vapor separator (6), the first gas-liquid separator (7a) and the second gas-liquid separator (7b) works in the intermediate air supplementing two-stage compression heat pump cycle heating mode to provide indoor heating.

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