Pvt heat pump based on a cross-seasonal thermal storage tank

Abstract

This invention discloses a PVT heat pump based on a cross-seasonal hot water storage tank, comprising a compressor, a first throttling valve, a heat exchanger, a second throttling valve, a photovoltaic module, a four-way reversing valve, a third throttling valve, a fourth throttling valve, a fifth throttling valve, a circulation pump, and a cross-seasonal hot water storage tank, forming four circulation paths. The first circulation path supplies heat from the cross-seasonal hot water storage tank to the user; the second circulation path supplies heat generated by the photovoltaic module to the user; the third circulation path stores heat generated by the photovoltaic module in the cross-seasonal hot water storage tank; and the fourth circulation path stores heat generated during the cooling process for the user in the cross-seasonal hot water storage tank. This application stores the heat energy in the PVT through the cross-seasonal hot water storage tank, reducing the temperature of the PVT and thus improving its power generation efficiency. It also recovers the heat generated during the user's cooling process, improving energy utilization.

Description

Technical Field

[0001] This invention relates to the field of cross-seasonal thermal storage technology, and more specifically to a PVT heat pump based on a cross-seasonal hot water storage tank. Background Technology

[0002] Solar energy is widely distributed and is a clean, pollution-free, and renewable energy source. Combining it with building energy needs aligns with current trends in building energy conservation and low-carbon development strategies, and is also an effective way to utilize solar energy on a large scale. Photovoltaic power generation (PVT) is a system that combines solar photovoltaic (PV) and solar thermal energy, consisting of two main components: photovoltaic and solar thermal. It combines solar energy with solar collectors to convert light energy into electrical energy through the photoelectric effect, while also generating some heat energy. Research has found that this heat energy has twice the energy of electrical energy, and recovering this heat energy can also improve the power generation efficiency of PVT. Due to the intermittent and seasonal nature of solar energy and the conflict with users' stable energy needs, how to recover, store, and rationally utilize solar energy has become an urgent problem to be solved.

[0003] Transseasonal thermal energy storage is a technology that utilizes seasonal differences to store thermal energy. It offers advantages such as efficient energy utilization, reduced energy costs, environmental friendliness, sustainable development, flexibility, and stability.

[0004] Chinese patent application number 201710653981.3 discloses a PVT heat pump system that can utilize solar radiation to achieve day and night-time thermoelectric cooling and heating. This system uses photovoltaic power generation technology and PVT heat pump technology to provide heating to users. However, this system only has one heat source, PVT, so its reliability cannot be guaranteed, and it does not consider cross-seasonal heat storage.

[0005] Chinese patent application number 202110934457.X discloses a heating system combining a PVT heat pump and a water source heat pump. This system provides heating while generating electricity, and supplements the heat when the heat supply is insufficient using an air source heat pump. It meets the heating needs during the heating season and the hot water needs during the non-heating season, achieving the effect of solar combined heat and power. However, the system's function is too limited, only providing heating and not cooling, and it does not consider cross-seasonal heat storage. Summary of the Invention

[0006] The purpose of this invention is to provide a PVT heat pump based on a cross-seasonal hot water storage tank, which adopts a direct connection method, can quickly provide heating and cooling, and also recovers the heat generated by the user's cooling process, thereby improving energy utilization and realizing cross-seasonal heat storage.

[0007] To achieve the above objectives, the technical solution of this application is as follows: a PVT heat pump based on a cross-seasonal hot water storage tank, comprising a compressor, a first throttle valve, a heat exchanger, a second throttle valve, a photovoltaic module, a four-way reversing valve, a third throttle valve, a fourth throttle valve, a fifth throttle valve, a circulation pump, and four circulation paths consisting of a cross-seasonal hot water storage tank;

[0008] The first circulation path connects the compressor, four-way reversing valve, user, first throttle valve, heat exchanger, circulation pump, inter-seasonal hot water storage tank, heat exchanger, fifth throttle valve, four-way reversing valve, and compressor in sequence to form a closed loop, supplying the heat in the inter-seasonal hot water storage tank to the user.

[0009] The second circulation path connects the compressor, four-way reversing valve, user, first throttle valve, second throttle valve, photovoltaic module, fourth throttle valve, fifth throttle valve, four-way reversing valve, and compressor in sequence to form a closed loop, supplying the heat generated in the photovoltaic module to the user.

[0010] The third circulation path connects the compressor, four-way reversing valve, third throttle valve, heat exchanger, circulation pump, inter-seasonal hot water storage tank, heat exchanger, fourth throttle valve, photovoltaic module, second throttle valve, and compressor in sequence to form a closed loop, storing the heat generated in the photovoltaic module through the inter-seasonal hot water storage tank.

[0011] The fourth circulation path connects the compressor, four-way reversing valve, fifth throttle valve, heat exchanger, inter-seasonal hot water storage tank, circulation pump, heat exchanger, first throttle valve, user, four-way reversing valve, and compressor in sequence to form a closed loop, which stores the heat generated during the cooling process for the user through the inter-seasonal hot water storage tank.

[0012] Furthermore, the heat exchanger, the inter-seasonal hot water storage tank, and the circulating pump are connected in sequence to form a circulating water loop.

[0013] Furthermore, when solar energy cannot be used at night or on cloudy days, the refrigerant provides the heat needed for daily life to users through the first circulation path: when the refrigerant passes through the heat exchanger, it absorbs heat from the inter-seasonal hot water storage tank through the circulation pump. Then, the refrigerant enters the compressor to increase its temperature and pressure before entering the user to supply heat to the user.

[0014] Furthermore, when there is sufficient solar radiation, the heat required for daily life is provided to users through a second circulation path: the refrigerant in the second circulation path absorbs heat as it passes through the photovoltaic modules, and then the refrigerant enters the compressor to increase its temperature and pressure before entering the user to supply heat for the user's use.

[0015] Furthermore, during the non-heating season, when users require less heat, the heat in the photovoltaic modules is stored through a third circulation path: the refrigerant in the third circulation path absorbs heat as it passes through the photovoltaic modules, and then the refrigerant enters the compressor to increase its temperature and pressure before entering the heat exchanger to release heat. The heat in the heat exchanger is then stored in the inter-seasonal hot water storage tank by a circulation pump.

[0016] Furthermore, when the weather is hot and cooling is needed, the heat generated during the cooling process is stored through the fourth circulation path: the refrigerant in the fourth circulation path absorbs heat from the user, then enters the compressor to increase its temperature and pressure before entering the heat exchanger to release heat, and the heat in the heat exchanger is stored in the cross-seasonal hot water storage tank through the circulation pump.

[0017] Furthermore, when the first circulation path is working, the first throttle valve and the fifth throttle valve are in the open state, while the second throttle valve, the third throttle valve, and the fourth throttle valve are in the closed state.

[0018] Furthermore, when the second circulation path is working, the first throttle valve, the second throttle valve, the fourth throttle valve, and the fifth throttle valve are in the open state, while the third throttle valve is in the closed state.

[0019] Furthermore, when the third circulation path is in operation, the third throttle valve, the fourth throttle valve, and the second throttle valve are in the open state, while the first throttle valve and the fifth throttle valve are in the closed state.

[0020] Furthermore, when the fourth circulation path is in operation, the fifth throttle valve and the first throttle valve are in the open state, while the third throttle valve, the fourth throttle valve, and the second throttle valve are in the closed state.

[0021] By adopting the above technical solution, the present invention can achieve the following technical effects:

[0022] 1. By recovering and utilizing the heat in the PVT, the temperature of the PVT is reduced, thereby improving the power generation efficiency of the PVT.

[0023] 2. The heat generated during the user's cooling process is stored in the cross-seasonal hot water storage tank, making full use of thermal energy and improving energy efficiency.

[0024] 3. The system has two heat sources, which resolves the contradiction between the intermittency and seasonality of solar energy and the stable energy demand of users.

[0025] 4. By storing the heat in the PVT through a cross-seasonal hot water storage tank and supplying it to users, a large temperature difference heating system can be achieved.

[0026] 5. The system uses a direct connection method, which can achieve rapid heating and cooling. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the PVT heat pump structure based on a cross-seasonal hot water storage tank.

[0028] The numbers in the diagram are explained as follows: 1. Compressor; 2. User; 3. First throttle valve; 4. Heat exchanger; 5. Second throttle valve; 6. Photovoltaic module; 7. Four-way reversing valve; 8. Third throttle valve; 9. Fourth throttle valve; 10. Fifth throttle valve; 11. Circulation pump; 12. Cross-seasonal hot water storage tank. Detailed Implementation

[0029] The principles of this disclosure will now be described with reference to several exemplary embodiments illustrated in the accompanying drawings. While preferred embodiments of this disclosure are shown in the drawings, it should be understood that these embodiments are described only to enable those skilled in the art to better understand and implement this disclosure, and are not intended to limit the scope of this disclosure in any way.

[0030] The term “comprising” and its variations, as used herein, indicate open inclusion, meaning “including but not limited to”. Unless otherwise stated, the term “or” means “and / or”. The term “based on” means “at least partially based on”. The terms “first,” “second,” “third,” “fourth,” “fifth,” etc., may refer to different or the same objects. Other explicit and implicit definitions may also be included below.

[0031] This embodiment provides a PVT heat pump based on a cross-seasonal hot water storage tank, which mainly includes four circulation paths consisting of a compressor 1, a user 2, a first throttle valve 3, a heat exchanger 4, a second throttle valve 5, a photovoltaic module 6, a four-way reversing valve 7, a third throttle valve 8, a fourth throttle valve 9, a fifth throttle valve 10, a circulation pump 11, and a cross-seasonal hot water storage tank 12.

[0032] First circulation path: The outlet of compressor 1 is connected to the CD inlet of four-way reversing valve 7, the CD outlet of four-way reversing valve 7 is connected to the inlet of user 2, the outlet of user 2 is connected to the inlet of first throttle valve 3, the outlet of first throttle valve 3 is connected to the inlet of heat exchanger 4, the outlet of heat exchanger 4 is connected to the inlet of circulating pump 11, the outlet of circulating pump 11 is connected to the inlet of inter-seasonal hot water storage tank 12, the outlet of inter-seasonal hot water storage tank 12 is connected to the inlet of heat exchanger 4, the outlet of heat exchanger 4 is connected to the inlet of fifth throttle valve 10, the outlet of fifth throttle valve 10 is connected to the AB inlet of four-way reversing valve 7, and the AB outlet of four-way reversing valve 7 is connected to the inlet of compressor 1. At this time, first throttle valve 3 and fifth throttle valve 10 are in the open state, and second throttle valve 5, third throttle valve 8, and fourth throttle valve 9 are in the closed state.

[0033] The second circulation path: The outlet of compressor 1 is connected to the CD inlet of four-way reversing valve 7; the CD outlet of four-way reversing valve 7 is connected to the inlet of user 2; the outlet of user 2 is connected to the inlet of first throttle valve 3; the outlet of first throttle valve 3 is connected to the inlet of second throttle valve 5; the outlet of second throttle valve 5 is connected to the inlet of photovoltaic module 6; the outlet of photovoltaic module 6 is connected to the inlet of fourth throttle valve 9; the outlet of fourth throttle valve 9 is connected to the inlet of fifth throttle valve 10; the outlet of fifth throttle valve 10 is connected to the AB inlet of four-way reversing valve 7; and the AB outlet of four-way reversing valve 7 is connected to the inlet of compressor 1. At this time, first throttle valve 3, second throttle valve 5, fourth throttle valve 9, and fifth throttle valve 10 are in the open state, and third throttle valve 8 is in the closed state.

[0034] The third circulation path: The outlet of compressor 1 is connected to the CD inlet of four-way reversing valve 7; the CD outlet of four-way reversing valve 7 is connected to the inlet of third throttle valve 8; the outlet of third throttle valve 8 is connected to the inlet of heat exchanger 4; the inlet of heat exchanger 4 is connected to the inlet of circulating pump 11; the outlet of circulating pump 11 is connected to the inlet of inter-seasonal hot water storage tank 12; the outlet of inter-seasonal hot water storage tank 12 is connected to the inlet of heat exchanger 4; the outlet of heat exchanger 4 is connected to the inlet of fourth throttle valve 9; the outlet of fourth throttle valve 9 is connected to the inlet of photovoltaic module 6; the outlet of photovoltaic module 6 is connected to the inlet of second throttle valve 5; and the outlet of second throttle valve 5 is connected to the inlet of compressor 1. At this time, third throttle valve 8, fourth throttle valve 9, and second throttle valve 5 are in the open state, while first throttle valve 3 and fifth throttle valve 10 are in the closed state.

[0035] Fourth circulation path: The outlet of compressor 1 is connected to the AD inlet of four-way reversing valve 7; the AD outlet of four-way reversing valve 7 is connected to the inlet of fifth throttle valve 10; the outlet of fifth throttle valve 10 is connected to the inlet of heat exchanger 4; the outlet of heat exchanger 4 is connected to the inlet of inter-seasonal hot water storage tank 12; the outlet of inter-seasonal hot water storage tank 12 is connected to the inlet of circulating pump 11; the outlet of circulating pump 11 is connected to the inlet of heat exchanger 4; the outlet of heat exchanger 4 is connected to the inlet of first throttle valve 3; the outlet of first throttle valve 3 is connected to the inlet of user 2; the outlet of user 2 is connected to the BC inlet of four-way reversing valve 7; and the BC outlet of four-way reversing valve 7 is connected to the inlet of compressor 1. At this time, fifth throttle valve 10 and first throttle valve 3 are in the open state, while third throttle valve 8, fourth throttle valve 9, and second throttle valve 5 are in the closed state.

[0036] The aforementioned PVT heat pump stores heat energy in the PVT through a cross-seasonal hot water storage tank, reducing the PVT's temperature and thus improving its power generation efficiency. This system has two heat sources, resolving the conflict between the intermittent and seasonal nature of solar energy and the stable energy needs of users. By directly connecting these sources, it enables rapid heating and cooling, and also recovers heat generated during the user's cooling process, improving energy utilization and aligning with the current low-carbon development strategy.

[0037] The above description is merely an optional embodiment of this disclosure and is not intended to limit this disclosure. Various modifications and variations can be made to this disclosure by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this disclosure should be included within the scope of protection of this disclosure.

[0038] Although the claims in this application have been formulated for specific combinations of features, it should be understood that the scope of this disclosure also includes any novel feature or any novel combination of features, whether express or implied or generalized herein, whether or not it relates to the same scheme in any of the claims currently claimed.

Claims

1. A PVT heat pump based on a cross-seasonal thermal storage tank, characterized in that, It includes four circulation paths consisting of a compressor, a first throttle valve, a heat exchanger, a second throttle valve, a photovoltaic module, a four-way reversing valve, a third throttle valve, a fourth throttle valve, a fifth throttle valve, a circulating pump, and a cross-seasonal hot water storage tank; First circulation path: The compressor outlet is connected to the CD inlet of the four-way reversing valve, the CD outlet of the four-way reversing valve is connected to the user's inlet, the user's outlet is connected to the inlet of the first throttle valve, the outlet of the first throttle valve is connected to the inlet of the heat exchanger, the outlet of the heat exchanger is connected to the inlet of the circulating pump, the outlet of the circulating pump is connected to the inlet of the inter-seasonal hot water storage tank, the outlet of the inter-seasonal hot water storage tank is connected to the inlet of the heat exchanger, the outlet of the heat exchanger is connected to the inlet of the fifth throttle valve, the outlet of the fifth throttle valve is connected to the AB inlet of the four-way reversing valve, and the AB outlet of the four-way reversing valve is connected to the compressor inlet. At this time, the first and fifth throttle valves are in the open state, and the second, third, and fourth throttle valves are in the closed state. Second circulation path: The compressor outlet is connected to the CD inlet of the four-way reversing valve, the CD outlet of the four-way reversing valve is connected to the user's inlet, the user's outlet is connected to the inlet of the first throttle valve, the outlet of the first throttle valve is connected to the inlet of the second throttle valve, the outlet of the second throttle valve is connected to the inlet of the photovoltaic module, the outlet of the photovoltaic module is connected to the inlet of the fourth throttle valve, the outlet of the fourth throttle valve is connected to the inlet of the fifth throttle valve, the outlet of the fifth throttle valve is connected to the AB inlet of the four-way reversing valve, and the AB outlet of the four-way reversing valve is connected to the compressor inlet; at this time, the first, second, fourth, and fifth throttle valves are in the open state, and the third throttle valve is in the closed state; The third circulation path: The compressor outlet is connected to the CD inlet of the four-way reversing valve; the CD outlet of the four-way reversing valve is connected to the inlet of the third throttle valve; the outlet of the third throttle valve is connected to the inlet of the heat exchanger; the inlet of the heat exchanger is connected to the inlet of the circulating pump; the outlet of the circulating pump is connected to the inlet of the inter-seasonal hot water storage tank; the outlet of the inter-seasonal hot water storage tank is connected to the inlet of the heat exchanger; the outlet of the heat exchanger is connected to the inlet of the fourth throttle valve; the outlet of the fourth throttle valve is connected to the inlet of the photovoltaic module; the outlet of the photovoltaic module is connected to the inlet of the second throttle valve; and the outlet of the second throttle valve is connected to the inlet of the compressor. At this time, the third, fourth, and second throttle valves are in the open state, while the first and fifth throttle valves are in the closed state. Fourth circulation path: The compressor outlet is connected to the AD inlet of the four-way reversing valve; the AD outlet of the four-way reversing valve is connected to the inlet of the fifth throttle valve; the outlet of the fifth throttle valve is connected to the inlet of the heat exchanger; the outlet of the heat exchanger is connected to the inlet of the inter-seasonal hot water storage tank; the outlet of the inter-seasonal hot water storage tank is connected to the inlet of the circulating pump; the outlet of the circulating pump is connected to the inlet of the heat exchanger; the outlet of the heat exchanger is connected to the inlet of the first throttle valve; the outlet of the first throttle valve is connected to the user's inlet; the user's outlet is connected to the BC inlet of the four-way reversing valve; and the BC outlet of the four-way reversing valve is connected to the compressor inlet. At this time, the fifth throttle valve and the first throttle valve are in the open state, while the third throttle valve, the fourth throttle valve, and the second throttle valve are in the closed state.

2. The PVT heat pump based on a cross-seasonal hot water storage tank according to claim 1, characterized in that, The heat exchanger, the seasonal hot water storage tank, and the circulating pump are connected in sequence to form a circulating water loop.

3. The PVT heat pump based on a cross-seasonal hot water storage tank according to claim 1, characterized in that, When solar energy cannot be used at night or on cloudy days, the refrigerant provides the heat needed for daily life to users through the first circulation path: when the refrigerant passes through the heat exchanger, it absorbs heat from the inter-seasonal hot water storage tank through the circulation pump. Then the refrigerant enters the compressor to increase the temperature and pressure before entering the user to supply heat to the user.

4. The PVT heat pump based on a cross-seasonal hot water storage tank according to claim 1, characterized in that, When there is sufficient solar radiation, the refrigerant provides the heat needed for daily life to users through a second circulation path: the refrigerant in the second circulation path absorbs heat as it passes through the photovoltaic modules, and then enters the compressor to increase its temperature and pressure before entering the user to supply heat for the user's use.

5. A PVT heat pump based on a cross-seasonal hot water storage tank according to claim 1, characterized in that, During the non-heating season, when users require less heat, the heat in the photovoltaic modules is stored through a third circulation path: the refrigerant in the third circulation path absorbs heat as it passes through the photovoltaic modules, and then the refrigerant enters the compressor to increase its temperature and pressure before entering the heat exchanger to release heat. The heat from the heat exchanger is then stored in the inter-seasonal hot water storage tank through a circulation pump.

6. A PVT heat pump based on a cross-seasonal hot water storage tank according to claim 1, characterized in that, When the weather is hot and cooling is needed, the heat generated during the cooling process is stored through the fourth circulation path: the refrigerant in the fourth circulation path absorbs heat from the user, then enters the compressor to increase the temperature and pressure, and then enters the heat exchanger to release heat. The heat in the heat exchanger is stored in the cross-seasonal hot water storage tank through the circulation pump.

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