Solar phase change energy storage heat pump system for agricultural greenhouse

Abstract

The utility model discloses a solar energy phase change energy storage heat pump system for an agricultural greenhouse, which comprises a solar energy storage system formed by a solar heat collection unit and a phase change energy storage unit which are connected with each other to form energy storage circulation, and the solar heat collection unit absorbs solar irradiation energy in the daytime, converts the solar irradiation energy into heat energy and stores the heat energy in the phase change energy storage unit; the water source heat pump is connected with the solar heat collection unit and the phase change energy storage unit to form a heat pump heating system, and the water source heat pump supplies heat to the greenhouse by extracting heat in the phase change energy storage unit at night; and switching between energy storage and heating is achieved through the control unit. By means of the mode, the solar phase change energy storage heat pump system for the agricultural greenhouse integrates the solar heat collection technology, the phase change heat storage technology and the water source heat pump technology, the surplus heat in the greenhouse in the daytime can be heated and stored in the phase change heat storage box, and the requirement for increasing the temperature of the agricultural greenhouse at night is met; the water source heat pump is used for extracting heat for greenhouse heat supply, and energy consumption can be greatly reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of solar phase change energy storage and water source heat pump heating, in particular to a solar phase change energy storage heat pump system for agricultural greenhouses. Background Art

[0002] The large-scale construction of greenhouses in the cold northern regions not only solves the supply of fresh fruits and vegetables for local residents, but also solves the diversified development of the rural economy (such as greenhouse breeding, seedling cultivation, etc.), providing strong support for the revitalization of the rural economy.

[0003] The "Encyclopedia of Chinese Agriculture: Vegetable Volume" describes the suitable production temperatures for different vegetables as follows: general vegetable crops grow slowly at 5℃~10℃; grow normally at 10℃~20℃; grow faster at 20℃~35℃; when the temperature exceeds 35℃ and is below 5℃, the growth of vegetable crops will be impaired; the suitable growth temperature is between 20℃~30℃.

[0004] Therefore, in cold northern regions, the air temperature in greenhouses must not be lower than a certain temperature (10°C) at night and in rainy, snowy and cloudy weather, which is the key to ensure the normal growth of plants. To ensure the temperature in the greenhouse, a heat source must be provided, which consumes a certain amount of energy.

[0005] At present, the main heat sources for greenhouse heating are coal-fired, gas-fired boilers and air source heat pumps. Coal-fired and gas-fired boilers consume a large amount of fossil energy and cause serious pollution to the environment. Air source heat pumps do not require heating in the high-efficiency area of ​​the greenhouse during the day, but the heating load required in the low-efficiency area at night is very large, resulting in large investment and high operating costs.

[0006] The characteristic of greenhouses is that during the day, the soil and plants absorb solar energy to generate heat, which creates a greenhouse effect in the greenhouse, with the temperature reaching 20℃ or even above 30℃; at night, due to the lack of solar energy supplement, the heat dissipation of the enclosure structure causes the temperature in the greenhouse to drop continuously. Therefore, how to move the abundant heat during the day to the night and maintain the temperature in the greenhouse at night is the key to solving the problem. Utility Model Content

[0007] The main technical problem solved by the utility model is to provide a solar phase change energy storage heat pump system for agricultural greenhouses, which integrates solar energy collection, phase change heat storage and water source heat pump technology. It can raise the temperature of the abundant heat in the greenhouse during the day and store it in the phase change heat storage box to meet the needs of agricultural greenhouses to increase temperature at night. The water source heat pump is used to extract the heat in the phase change energy storage unit. Only a small amount of electricity is needed to raise the temperature for greenhouse heating. The energy consumption during operation is extremely low, which can greatly reduce energy consumption.

[0008] In order to solve the above technical problems, a technical solution adopted by the utility model is: to provide a solar phase change energy storage heat pump system for agricultural greenhouses, including:

[0009] A solar energy storage system, comprising a solar thermal collection unit and a phase change energy storage unit interconnected to form an energy storage cycle, wherein during the day, the solar thermal collection unit absorbs solar radiation energy and converts it into heat energy which is stored in the phase change energy storage unit;

[0010] The heat pump heating system includes a water source heat pump, which is connected to a solar heat collection unit and a phase change energy storage unit. At night, the water source heat pump heats the greenhouse by extracting heat from the phase change energy storage unit.

[0011] A control unit is electrically connected to the solar thermal collection unit, the phase change energy storage unit and the water source heat pump, and the switching between energy storage and heating is achieved through the control unit.

[0012] In a preferred embodiment of the present invention, the control unit includes a controller, a first temperature sensing probe, a second temperature sensing probe and a third temperature sensing probe, wherein the first temperature sensing probe, the second temperature sensing probe and the third temperature sensing probe are electrically connected to the controller.

[0013] The first temperature sensing probe is placed in the solar thermal collection unit, the second temperature sensing probe is placed in the phase change energy storage unit, and the third temperature sensing probe is placed in the greenhouse one meter above the ground.

[0014] In a preferred embodiment of the utility model, the control unit also includes a first circulating water pump, a second circulating water pump, a first electric valve, a second electric valve, a third electric valve, a fourth electric valve and a fifth electric valve, and the controller is electrically connected to the first electric valve, the second electric valve, the third electric valve, the fourth electric valve, the fifth electric valve, the first circulating water pump, the second circulating water pump and the water source heat pump.

[0015] In a preferred embodiment of the utility model, the outlet of the solar thermal collection unit is connected to the inlet of the first circulating water pump, the outlet of the first circulating water pump is connected to the inlet of the phase change energy storage unit through the fourth electric valve, and the outlet of the phase change energy storage unit is connected to the inlet of the solar thermal collection unit through the first electric valve;

[0016] The outlet of the first circulating water pump is also connected to the inlet of the condenser in the water source heat pump, the outlet of the evaporator in the water source heat pump is connected to the inlet of the second circulating water pump, and the outlet of the second circulating water pump is connected to the inlet of the phase change energy storage unit. The outlet of the phase change energy storage unit is connected to the inlet of the evaporator in the water source heat pump through the third electric valve, and the outlet of the condenser in the water source heat pump is connected to the inlet of the solar collector through the second electric valve.

[0017] In a preferred embodiment of the utility model, the solar thermal collection unit includes a solar thermal collector array and a connecting pipeline, the solar thermal collector array includes a plurality of solar thermal collector panels arranged in series, the solar thermal collector panel group is composed of a plurality of solar thermal collector panels connected in parallel, and the solar thermal collector panel includes a working fluid inlet end and a working fluid outlet end of a heat exchange working fluid:

[0018] The working fluid outlet end of the upper solar collector panel group is connected to the working fluid inlet end of the adjacent next solar collector panel group, the working fluid inlet end of the first solar collector panel group is connected to the system's water supply pipe, and the working fluid outlet end of the last solar collector panel group is connected to the system's return water pipe.

[0019] In a preferred embodiment of the present invention, the phase change energy storage unit comprises a phase change energy storage box, a heat exchange tube and a phase change energy storage material.

[0020] The phase change energy storage box forms an outer protective structure of the phase change energy storage unit, a heat exchange tube is arranged inside the phase change energy storage box, and a phase change energy storage material is filled in the gap between the inside of the phase change energy storage box and the outside of the heat exchange tube.

[0021] In a preferred embodiment of the utility model, the water source heat pump comprises a compressor, a water-fluorine shell and tube evaporator, a water-fluorine shell and tube condenser and a throttle valve connected in series to form a loop.

[0022] The tube-side heat exchange working medium of the water-fluorine shell and tube evaporator is fluorine, the shell-side heat exchange working medium is water, the water channel inlet end of the evaporator is connected to the working medium outlet end of the phase change energy storage unit, the water channel outlet end of the evaporator is connected to the second circulating water pump, and the second circulating water pump is connected to the working medium inlet end of the phase change energy storage unit;

[0023] The tube-side heat exchange working fluid of the water-fluorine shell and tube condenser is fluorine, and the shell-side heat exchange working fluid is water. The condenser water circuit inlet end is connected to the first circulating water pump outlet end, the working fluid outlet end of the solar thermal collection unit is connected to the first circulating water pump inlet end, and the condenser water circuit outlet end is connected to the working fluid inlet end of the solar thermal collection unit, thereby forming a circulating pipeline system.

[0024] In a preferred embodiment of the utility model, it also includes an auxiliary heat source, which is connected in parallel between the solar thermal collection unit and the phase change energy storage unit. A fifth electric valve is arranged on the connecting pipeline of the auxiliary heat source, and the fifth electric valve is electrically connected to the controller.

[0025] The beneficial effects of the utility model are as follows: it integrates solar energy collection, phase change heat storage and water source heat pump technology into one, and can heat up the abundant heat in the greenhouse during the day and store it in the phase change heat storage box to meet the needs of nighttime warming of the agricultural greenhouse; it completes the cross-time transfer of energy, and while increasing the nighttime temperature of the agricultural greenhouse, it realizes peak shaving and valley filling of solar energy; it uses a water source heat pump to extract heat from the phase change energy storage unit, and only consumes a small amount of electric energy to raise the temperature for greenhouse heating, and the energy consumption during operation is extremely low, which can greatly reduce energy consumption. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative work, among which:

[0027] Figure 1 It is a structural schematic diagram of a solar phase change energy storage heat pump system for agricultural greenhouses of the utility model;

[0028] Figure 2 This is a control principle diagram of the solar phase change energy storage heat pump system for agricultural greenhouses of the utility model;

[0029] Figure 3 This is a schematic diagram of the application structure of a preferred embodiment of the solar phase change energy storage heat pump system for agricultural greenhouses of the utility model;

[0030] The markings of the components in the accompanying drawings are as follows:

[0031] 1. First electric valve, 2. Second electric valve, 3. Third electric valve, 4. Fourth electric valve, 5. Fifth electric valve, 6. First circulating water pump, 7. Second circulating water pump, 8. Auxiliary heat source, 9. Water source heat pump, 10. Phase change energy storage unit, 11. Solar thermal collection / heating unit. DETAILED DESCRIPTION

[0032] In order to make the purpose, technical scheme and advantages of the embodiments of the utility model clearer, the technical scheme in the embodiments of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiments of the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Generally, the components of the embodiments of the utility model described and shown in the drawings here can be arranged and designed in various different configurations.

[0033] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the present invention to be protected, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0034] The utility model relates to a preferred embodiment of a solar energy phase change energy storage heat pump system for agricultural greenhouses, which couples solar energy collection, phase change energy storage and water source heat pumps for energy storage, realizes different operation modes through circulating water pumps and electric valves, and meets the needs of nighttime heating of agricultural greenhouses.

[0035] See also Figure 1-3 The solar phase change energy storage heat pump system for agricultural greenhouses includes a solar energy storage system, a heat pump heating system and a control unit:

[0036] The solar energy storage system comprises a solar thermal collection unit 11 and a phase change energy storage unit 10 which are interconnected to form an energy storage cycle. During the day, the solar thermal collection unit 1 absorbs solar radiation energy and converts it into heat energy which is stored in the phase change energy storage unit 10.

[0037] The heat pump heating system includes a water source heat pump 9, which is connected to a solar energy collection unit 11 and a phase change energy storage unit 10. At night, the water source heat pump 9 extracts heat from the phase change energy storage unit 10 to heat the greenhouse.

[0038] The control unit is electrically connected to the solar thermal collection unit 11, the phase change energy storage unit 10 and the water source heat pump 9, and the switching between energy storage and heating is achieved through the control unit.

[0039] The utility model adopts a water source heat pump 9 to raise the temperature. The operation efficiency of the water source heat pump 9 is relatively high, especially when the ambient temperature is low, such as in winter, because the water temperature is higher than the air temperature, so the circulation evaporation temperature and energy efficiency ratio of the water source heat pump 9 will be improved. In this way, when the water source heat pump extracts the heat in the phase change energy storage unit, only a small amount of electric energy is consumed to raise the temperature for greenhouse heating. This process consumes very little energy, which can greatly reduce energy consumption.

[0040] In an exemplary embodiment, the solar thermal collection unit 11 includes a solar thermal collector array and connecting pipelines, the solar thermal collector array includes a plurality of solar thermal collector panels arranged in series, the solar thermal collector panel group is composed of a plurality of solar thermal collector panels connected in parallel, and the solar thermal collector panel includes a working fluid inlet end and a working fluid outlet end of a heat exchange working fluid:

[0041] The working fluid outlet end of the upper solar collector panel group is connected to the working fluid inlet end of the adjacent next solar collector panel group, the working fluid inlet end of the first solar collector panel group is connected to the system's water supply pipe, and the working fluid outlet end of the last solar collector panel group is connected to the system's return water pipe.

[0042] In an exemplary embodiment, the phase change energy storage unit 10 includes a phase change energy storage box, a heat exchange tube and a phase change energy storage material. The phase change energy storage box forms an outer protective structure of the phase change energy storage unit. The phase change energy storage box is provided with a heat exchange tube, and the phase change energy storage material is filled in the gap between the inside of the phase change energy storage box and the outside of the heat exchange tube. Preferably, the heat exchange tube is made of HDPE / PP plastic material, and the phase change point of the phase change energy storage material is 35-48°C.

[0043] In an exemplary embodiment, the water source heat pump 9 includes a compressor, a water-fluorine shell and tube evaporator, a water-fluorine shell and tube condenser and a throttle valve connected in series to form a loop.

[0044] The tube-side heat exchange working medium of the water-fluorine shell and tube evaporator is fluorine, the shell-side heat exchange working medium is water, the water channel inlet end of the evaporator is connected to the working medium outlet end of the phase change energy storage unit, the water channel outlet end of the evaporator is connected to the second circulating water pump, and the second circulating water pump is connected to the working medium inlet end of the phase change energy storage unit;

[0045] The tube-side heat exchange working fluid of the water-fluorine shell and tube condenser is fluorine, and the shell-side heat exchange working fluid is water. The condenser water circuit inlet end is connected to the first circulating water pump outlet end, the working fluid outlet end of the solar thermal collection unit is connected to the first circulating water pump inlet end, and the condenser water circuit outlet end is connected to the working fluid inlet end of the solar thermal collection unit, thereby forming a circulating pipeline system.

[0046] In an exemplary embodiment, the control unit includes a controller, a first temperature sensing probe, a second temperature sensing probe and a third temperature sensing probe, wherein the first temperature sensing probe, the second temperature sensing probe and the third temperature sensing probe are electrically connected to the controller, wherein the first temperature sensing probe is placed in the solar thermal collection unit 11, the second temperature sensing probe is placed in the phase change energy storage unit 10, and the third temperature sensing probe is placed in the greenhouse one meter above the ground.

[0047] Furthermore, the control unit also includes a first circulating water pump 6, a second circulating water pump 7, a first electric valve 1, a second electric valve 2, a third electric valve 3, a fourth electric valve 4 and a fifth electric valve 5, and the controller is electrically connected to the first electric valve 1, the second electric valve 2, the third electric valve 3, the fourth electric valve 4, the fifth electric valve 5, the first circulating water pump 6, the second circulating water pump 7 and the water source heat pump 9, wherein the fifth electric valve 5 is an electric three-way valve.

[0048] Furthermore, the outlet of the solar thermal collection unit 11 is connected to the inlet of the first circulating water pump 6, the outlet of the first circulating water pump 6 is connected to the inlet of the phase change energy storage unit 10 through the fourth electric valve 4, and the outlet of the phase change energy storage unit 10 is connected to the inlet of the solar thermal collection unit 11 through the first electric valve 1;

[0049] The outlet of the first circulating water pump 6 is also connected to the inlet of the condenser in the water source heat pump 9, the outlet of the evaporator in the water source heat pump 9 is connected to the inlet of the second circulating water pump 7, and the outlet of the second circulating water pump 7 is connected to the inlet of the phase change energy storage unit 10. The outlet of the phase change energy storage unit 10 is connected to the inlet of the evaporator in the water source heat pump 9 through the third electric valve 3, and the outlet of the condenser in the water source heat pump 9 is connected to the inlet of the solar collector through the second electric valve 2.

[0050] The solar energy phase change energy storage heat pump system for agricultural greenhouses of the utility model includes a solar energy storage system and an auxiliary heat source 8, which is connected in parallel between the solar heat collection unit 11 and the phase change energy storage unit 10. A fifth electric valve 5 is provided on the connecting pipeline of the auxiliary heat source 8, and the fifth electric valve 5 is electrically connected to the controller. When the phase change energy storage unit 10 cannot meet the temperature increase and heating of the water source heat pump 9, the auxiliary heat source 8 is started for auxiliary heating.

[0051] The solar energy phase change energy storage heat pump system for agricultural greenhouses of the utility model includes a control process of the solar energy storage system: including three operating modes: energy storage mode, heating mode and auxiliary energy heating mode:

[0052] Assume that the core temperature of the solar collector is T b , set the temperature to T o (generally set to 25-35℃), the air temperature in the greenhouse is T i ,

[0053] Assume the temperature inside the phase change energy storage box is T h , the set temperature of the phase change energy storage box is T1 (generally set to 35-45℃),

[0054] The controller controls the start and stop of the first electric valve 1, the second electric valve 2, the third electric valve 3, the fourth electric valve 4, the fifth electric valve 5 (electric three-way valve), the first circulating water pump 6, the second circulating water pump 7 and the water source heat pump 9 according to the temperature signals of each temperature probe;

[0055] 1. Energy storage mode:

[0056] T b -T o>ΔT1 (where ΔT1 is the starting temperature difference set for solar thermal collector), start the first circulating water pump 6, open the first electric valve 1, open the fourth electric valve 4, close the second electric valve 2, and close the third electric valve 3. At this time, the solar thermal collector absorbs solar radiation energy and converts it into heat energy and stores it in the phase change energy storage unit;

[0057] When T h >T1 (where T1 is the upper temperature limit set in the phase change energy storage box), turn off the first circulating water pump 6, close the first electric valve 1 and the fourth electric valve 4, and stop energy storage;

[0058] 2. Heating mode:

[0059] When T i <T2 (where T2 is the lower limit of the air temperature in the greenhouse in heating mode, such as 10°C), the first circulating water pump 6 is turned on, the second circulating water pump 7 is turned on, the second electric valve 2 is opened, the third electric valve 3 is opened, the first electric valve 1 is closed, and the fourth electric valve 4 is closed. At this time, the water source heat pump 9 extracts heat from the phase change energy storage tank and uses a small amount of electric energy to heat the greenhouse.

[0060] When T i >T2 (where T2 is the upper limit of the air temperature in the greenhouse in the heating mode, such as 15°C), turn off the first circulating water pump 6 and the second circulating water pump 7 to stop heating;

[0061] 3. Auxiliary energy heating mode:

[0062] When T h When <T3 (where T3 is the lower limit of the temperature setting in the phase change heat storage tank, such as 10°C), the first circulating water pump 6 is turned on, the second electric valve 2 is opened, the fifth electric valve 5 is opened (the electric valve body is opened to connect the auxiliary heat source pipeline), the first electric valve 1 is closed, the third electric valve 3 is closed, the fourth electric valve 4 is closed, the second circulating pump 7 is closed, and the auxiliary energy 8 heating system is turned on to supply heat to the greenhouse. The auxiliary energy 8 can be a gas water heater and an electric water heater.

[0063] The beneficial effects of the solar phase change energy storage heat pump system used in agricultural greenhouses of the utility model are:

[0064] The technology of solar energy collection, phase change heat storage and water source heat pump is integrated into one, which can heat up the greenhouse during the day and store it in the phase change heat storage tank to meet the need of nighttime heating in agricultural greenhouses.

[0065] The energy transfer across time is completed, which not only increases the temperature of agricultural greenhouse at night, but also realizes the peak shifting and valley filling of solar energy.

[0066] By using a water source heat pump to extract heat from the phase change energy storage unit, only a small amount of electricity is needed to raise the temperature for greenhouse heating. The energy consumption during operation is extremely low, which can greatly reduce energy consumption.

[0067] The above description is only an embodiment of the present invention, and does not limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made using the contents of the present invention specification, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A solar phase change energy storage heat pump system for agricultural greenhouses, characterized in that: include: A solar energy storage system, comprising a solar thermal collection unit and a phase change energy storage unit interconnected to form an energy storage cycle, wherein during the day, the solar thermal collection unit absorbs solar radiation energy and converts it into heat energy which is stored in the phase change energy storage unit; The heat pump heating system includes a water source heat pump, which is connected to a solar heat collection unit and a phase change energy storage unit. At night, the water source heat pump heats the greenhouse by extracting heat from the phase change energy storage unit. A control unit is electrically connected to the solar thermal collection unit, the phase change energy storage unit and the water source heat pump, and the switching between energy storage and heating is achieved through the control unit.

2. The solar phase change energy storage heat pump system for agricultural greenhouses according to claim 1 is characterized in that: The control unit includes a controller, a first temperature sensing probe, a second temperature sensing probe and a third temperature sensing probe, wherein the first temperature sensing probe, the second temperature sensing probe and the third temperature sensing probe are electrically connected to the controller. The first temperature sensing probe is placed in the solar thermal collection unit, the second temperature sensing probe is placed in the phase change energy storage unit, and the third temperature sensing probe is placed in the greenhouse one meter above the ground.

3. The solar phase change energy storage heat pump system for agricultural greenhouses according to claim 2 is characterized in that: The control unit also includes a first circulating water pump, a second circulating water pump, a first electric valve, a second electric valve, a third electric valve, a fourth electric valve and a fifth electric valve, and the controller is electrically connected to the first electric valve, the second electric valve, the third electric valve, the fourth electric valve, the fifth electric valve, the first circulating water pump, the second circulating water pump and the water source heat pump.

4. The solar phase change energy storage heat pump system for agricultural greenhouses according to claim 3 is characterized in that: The outlet of the solar thermal collection unit is connected to the inlet of the first circulating water pump, the outlet of the first circulating water pump is connected to the inlet of the phase change energy storage unit through the fourth electric valve, and the outlet of the phase change energy storage unit is connected to the inlet of the solar thermal collection unit through the first electric valve; The outlet of the first circulating water pump is also connected to the inlet of the condenser in the water source heat pump, the outlet of the evaporator in the water source heat pump is connected to the inlet of the second circulating water pump, and the outlet of the second circulating water pump is connected to the inlet of the phase change energy storage unit. The outlet of the phase change energy storage unit is connected to the inlet of the evaporator in the water source heat pump through the third electric valve, and the outlet of the condenser in the water source heat pump is connected to the inlet of the solar collector through the second electric valve.

5. The solar phase change energy storage heat pump system for agricultural greenhouses according to claim 3 is characterized in that: The solar thermal collection unit includes a solar thermal collector array and connecting pipelines. The solar thermal collector array includes a plurality of solar thermal collector panels arranged in series. The solar thermal collector panel group is composed of a plurality of solar thermal collector panels connected in parallel. The solar thermal collector panel includes a working medium inlet end and a working medium outlet end of a heat exchange working medium: The working fluid outlet end of the upper solar collector panel group is connected to the working fluid inlet end of the adjacent next solar collector panel group, the working fluid inlet end of the first solar collector panel group is connected to the system's water supply pipe, and the working fluid outlet end of the last solar collector panel group is connected to the system's return water pipe.

6. The solar phase change energy storage heat pump system for agricultural greenhouses according to claim 3 is characterized in that: The phase change energy storage unit comprises a phase change energy storage box, a heat exchange tube and a phase change energy storage material. The phase change energy storage box forms an outer protective structure of the phase change energy storage unit, a heat exchange tube is arranged inside the phase change energy storage box, and a phase change energy storage material is filled in the gap between the inside of the phase change energy storage box and the outside of the heat exchange tube.

7. The solar phase change energy storage heat pump system for agricultural greenhouses according to claim 3 is characterized in that: The water source heat pump comprises a compressor, a water-fluorine shell and tube evaporator, a water-fluorine shell and tube condenser and a throttle valve connected in series to form a loop. The tube-side heat exchange working medium of the water-fluorine shell and tube evaporator is fluorine, the shell-side heat exchange working medium is water, the water channel inlet end of the evaporator is connected to the working medium outlet end of the phase change energy storage unit, the water channel outlet end of the evaporator is connected to the second circulating water pump, and the second circulating water pump is connected to the working medium inlet end of the phase change energy storage unit; The tube-side heat exchange working fluid of the water-fluorine shell and tube condenser is fluorine, and the shell-side heat exchange working fluid is water. The condenser water circuit inlet end is connected to the first circulating water pump outlet end, the working fluid outlet end of the solar thermal collection unit is connected to the first circulating water pump inlet end, and the condenser water circuit outlet end is connected to the working fluid inlet end of the solar thermal collection unit, thereby forming a circulating pipeline system.

8. The solar phase change energy storage heat pump system for agricultural greenhouses according to claim 3 is characterized in that: It also includes an auxiliary heat source, which is connected in parallel between the solar thermal collection unit and the phase change energy storage unit. A fifth electric valve is arranged on the connecting pipeline of the auxiliary heat source, and the fifth electric valve is electrically connected to the controller.

Images