Solar cross-quarter energy storage and soil source heat pump coupling heating system

Abstract

The utility model relates to the technical field of energy conservation and environmental protection, in particular to a solar cross-quarter energy storage and soil source heat pump coupling heating system. The system comprises a solar photo-thermal photovoltaic integrated subsystem, a soil source heat pump coupling heat storage system and a heat user terminal system, the solar photo-thermal photovoltaic integrated subsystem comprises a photo-thermal photovoltaic integrated assembly, a heat exchanger, a storage battery and a circulating pump, and the solar photo-thermal photovoltaic integrated subsystem is used for supplying power to electric equipment of the system and collecting heat; the soil source heat pump coupling heat storage system comprises a soil source heat pump unit, a plate heat exchanger and soil serving as a heat storage medium. And a terminal user maintains proper indoor temperature and required hot water through the heat exchanger. Solar energy and geothermal energy are combined, abundant solar energy is converted into heat energy to be stored in soil in the non-heating season, then the heat energy is taken out through the ground source heat pump for heating in the heating season, renewable energy sources are fully utilized, and the current situation that cold and heat loads are uneven due to long-term operation of the soil is effectively prevented; finally, the purposes of high efficiency, energy conservation and emission reduction are achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of building energy conservation and environmental protection, in particular to a solar energy cross-seasonal energy storage and soil source heat pump coupled heating system. Background Art

[0002] The current energy market faces enormous opportunities and challenges, with energy conservation and carbon reduction becoming a hot topic of concern for the entire society. Ground-source heat pumps convert low-grade geothermal energy in the soil into high-quality thermal energy through a heat pump. During the heating season, heat is extracted from the underground soil for heating users. During the non-heating season, when cooling is needed, the heat is transferred to the underground soil. By extracting and releasing heat during the heating and non-heating seasons, ground-source heat pumps can operate stably. However, in high-altitude cold regions, the heat load on buildings is greater than the cooling load in summer, and long-term operation will lead to an imbalance in soil temperature. Finding a widely distributed, stable, continuous, and easily accessible auxiliary heat source to supplement heat to the soil is imperative.

[0003] To this end, this patent uses solar energy as an auxiliary heat source to alleviate the uneven heating and cooling loads of ground-source heat pumps in high-altitude and cold regions. By simultaneously using geothermal and solar energy, two clean energy sources, to provide the building with the required hot water and cooling / heating, it reduces overall system energy consumption and environmental pollution, contributing to the achievement of China's dual carbon goals. Utility Model Content

[0004] The purpose of this utility model is to address the problems existing in the background technology and propose a solar energy cross-seasonal energy storage and soil source heat pump coupling heating system, which improves the system stability and greatly improves the system energy utilization efficiency.

[0005] The technical solution of the utility model is a solar energy cross-seasonal energy storage and soil source heat pump coupled heating system, which includes a solar thermal photovoltaic integrated subsystem, an energy storage subsystem and a user end;

[0006] The integrated solar thermal photovoltaic subsystem is used to power the entire system and store energy for soil heating across seasons;

[0007] The energy storage subsystem is used to exchange heat with the solar thermal photovoltaic integrated subsystem, store thermal energy and supply it to the user end;

[0008] In the non-heating season, the solar thermal photovoltaic integrated subsystem transmits heat to the energy storage subsystem, and the solar energy is converted into thermal energy and stored in the soil;

[0009] During the heating season, the thermal energy stored in the soil is transferred to the user end for use after heat exchange through the energy storage subsystem.

[0010] Preferably, the solar thermal photovoltaic integrated subsystem includes a solar thermal photovoltaic integrated component, an inverter and a battery;

[0011] Thermal energy and electrical energy are generated through integrated solar thermal photovoltaic components; the thermal energy is transmitted to the energy storage subsystem, and the electrical energy is transmitted to the battery for storage through the inverter.

[0012] Preferably, the energy storage subsystem includes a first heat exchanger, a water tank, a first three-way valve, a first circulation pump, a second three-way valve, a second heat exchanger, a second circulation pump, a ground source heat pump, a first buried pipe, a second buried pipe, a boiler, a third circulation pump and a valve;

[0013] The heat generated by the solar thermal photovoltaic integrated component is exchanged with the energy storage subsystem in the first heat exchanger through the water path;

[0014] The first output end of the first heat exchanger is connected to the water tank, and the second output end of the first heat exchanger is transported to the solar thermal photovoltaic integrated assembly through the fourth circulation pump;

[0015] The first output end of the water tank is connected to the first three-way valve, and the second output end is connected to the input end of the first heat exchanger through the valve;

[0016] One end of the first three-way valve is connected to the first end of the second three-way valve via a first circulation pump, and the other end is connected to the boiler via a third circulation pump, and the output end of the boiler is connected to the first end of the second three-way valve;

[0017] The second end of the second three-way valve is connected to the input end of the second heat exchanger, and the third end is connected to the second buried pipe; the first output end of the second heat exchanger is connected to the user end through the second circulation pump; the return pipe of the user end is connected to the input end of the second heat exchanger; the second output end of the second heat exchanger is connected to the second buried pipe; and the return end of the second buried pipe is connected to the input end of the first heat exchanger;

[0018] A circulation loop is formed between the soil source heat pump, the user end and the first buried pipe; in the heating season, heating is provided to the user end through the soil source heat pump and the first buried pipe.

[0019] Preferably, in the non-heating season, when the water temperature in the water tank of the energy storage subsystem does not reach 85°C, the valve is opened, the first three-way valve is closed, and the water in the water tank is continuously heated by the heat exchanger until it reaches 85°C;

[0020] When the water temperature in the water tank of the energy storage subsystem reaches 85°C, the valve closes, the first three-way valve opens to connect the second buried pipe branch, the energy storage system starts to operate, and solar energy is converted into thermal energy and stored in the soil.

[0021] Preferably, the energy storage subsystem provides domestic hot water and the required heat load to the user end during the heating season; close the valve, open the first three-way valve through the branch of the boiler, and the hot water passes through the second heat exchanger to provide domestic hot water to the heat users.

[0022] Preferably, when the temperature of the energy storage subsystem is lower than 0°C during the heating season, the fourth circulation pump is turned on.

[0023] Preferably, the buried depths of the first buried pipe and the second buried pipe are between 50 and 80 m.

[0024] Compared with the prior art, the present invention has the following beneficial technical effects:

[0025] (1) The utility model utilizes solar thermal photovoltaic technology to not only provide heat for the energy storage subsystem, but also power the system's heavy circulation pumps and other electrical equipment, thereby achieving efficient utilization of renewable energy.

[0026] (2) The utility model provides heating and domestic hot water for heat users by coupling solar thermal photovoltaic and soil source heat pump, which helps to balance the cold and heat loads of the soil, maintain the efficient operation of the soil source heat pump throughout the year, and improve the ecological environment.

[0027] (3) By utilizing solar energy and geothermal energy, the utility model can effectively reduce the electricity load and gas load of buildings in extreme weather conditions, thereby reducing the pressure on the power grid while meeting the needs of heat users as much as possible and reducing the impact on the ecological environment. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 This is a schematic diagram of the solar energy cross-seasonal energy storage and soil source heat pump coupled heating system in the present invention.

[0029] Figure numerals: 1. Solar thermal photovoltaic integrated subsystem; 101. Solar thermal photovoltaic integrated component; 102. Inverter; 103. Battery; 104. Fourth circulation pump; 2. Energy storage subsystem; 201. First heat exchanger; 202. Water tank; 203. First three-way valve; 204. First circulation pump; 205. Second three-way valve; 206. Second heat exchanger; 207. Second circulation pump; 208. Soil source heat pump; 209. First buried pipe; 210. Second buried pipe; 211. Boiler; 212. Third circulation pump; 213. Valve; 3. User end. DETAILED DESCRIPTION

[0030] Example 1

[0031] like Figure 1As shown, the utility model proposes a solar energy cross-seasonal energy storage and soil source heat pump coupled heating system, including a solar thermal photovoltaic integrated subsystem 1, an energy storage subsystem 2 and a user end 3; the solar thermal photovoltaic integrated subsystem 1 is used to supply power to the entire system and to perform cross-seasonal energy storage and heating of the soil; the energy storage subsystem 2 is used to exchange heat with the solar thermal photovoltaic integrated subsystem 1, store thermal energy and provide it for use by the user end 3; in the non-heating season, the solar thermal photovoltaic integrated subsystem 1 transmits heat to the energy storage subsystem 2, and the solar energy is converted into thermal energy and stored in the soil; in the heating season, the thermal energy stored in the soil is transmitted to the user end 3 for use after heat exchange through the energy storage subsystem 2.

[0032] In this embodiment, the solar thermal photovoltaic integrated subsystem 1 includes a solar thermal photovoltaic integrated component 101, an inverter 102, and a battery 103; the solar thermal photovoltaic integrated component 101 generates heat energy and electrical energy; the heat energy is transmitted to the energy storage subsystem 2, and the electrical energy is transmitted to the battery 103 for storage through the inverter 102; the energy storage subsystem 2 includes a first heat exchanger 201, a water tank 202, a first three-way valve 203, a first circulation pump 204, a second three-way valve 205, a second heat exchanger 206, a second circulation pump 207, a soil source heat pump 208, a first buried pipe 209, a second buried pipe 210, a boiler 211, a third circulation pump 212, and a valve 213;

[0033] The heat generated by the solar thermal photovoltaic integrated component 101 is exchanged with the energy storage subsystem 2 in the first heat exchanger 201 through the water path; the first output end of the first heat exchanger 201 is connected to the water tank 202, and the second output end of the first heat exchanger 201 is transported to the solar thermal photovoltaic integrated component 101 through the fourth circulation pump 104; the first output end of the water tank 202 is connected to the first three-way valve 203, and the second output end is connected to the input end of the first heat exchanger 201 through the valve 213; one end of the first three-way valve 203 is connected to the first end of the second three-way valve 205 through the first circulation pump 204, and the other end is connected to the boiler 211 through the third circulation pump 212, and the output end of the boiler 211 Connected to the first end of the second three-way valve; the second end of the second three-way valve 205 is connected to the input end of the second heat exchanger 206, and the third end is connected to the second buried pipe 210; the first output end of the second heat exchanger 206 is connected to the user end 3 through the second circulation pump 207; the return pipe of the user end 3 is connected to the input end of the second heat exchanger 206; the second output end of the second heat exchanger 206 is connected to the second buried pipe 210; the return end of the second buried pipe 210 is connected to the input end of the first heat exchanger 201; a circulation loop is formed between the soil source heat pump 208 and the user end 3 and the first buried pipe 209; in the heating season, the user end 3 is heated by the soil source heat pump 208 and the first buried pipe 209.

[0034] In this embodiment, the heating season and the non-heating season are first determined by combining the heating data, time, and ambient temperature of the region; the heating data includes local historical temperature data, heating day data, and heating cycle data; the start and end times of the required heating can be estimated based on the historical temperature data, combined with the heating day data and the heating cycle data, and then, when the start date is approaching, the ambient temperature is combined to determine whether the heating season has begun;

[0035] During the heating season, the valve 213 is closed, and the branch leading to the second buried pipe 210 is closed. The branch leading to the second heat exchanger 206 at the user end 3 through the boiler 211 is opened. The water passing through the solar thermal photovoltaic integrated assembly 101 is further heated by the boiler 211 to provide domestic hot water for the heat users.

[0036] During the heating season, user end 3 uses heat stored in the soil during the non-heating season to provide heating via first buried pipe 209 and ground-source heat pump 208. When the temperature of energy storage subsystem 2 falls below 0°C during the heating season, fourth circulating pump 104 activates, circulating water to prevent freezing damage. This solar inter-seasonal energy storage and ground-source heat pump coupled heating system is primarily suitable for areas with abundant solar thermal resources and good geothermal resources. The first and second buried pipes 209 and 210 are buried at depths between 50 and 80 meters.

[0037] During the non-heating season, the first three-way valve 203 that transmits heat to the soil is closed, and the valve 213 is opened until the water temperature in the water tank rises to 85°C. Then, the valve 213 is closed, and the branch from the first three-way valve 203 to the second buried pipe 210 is opened. Part of the water passing through the solar thermal photovoltaic integrated assembly 101 enters the second heat exchanger 206 to provide domestic hot water for users, and the other part is converted into heat energy and stored in the soil.

[0038] In the non-heating season, when the temperature difference between the outdoor temperature and the indoor temperature reaches 4 degrees Celsius, the ground source heat pump 208 and the first buried pipe 209 are turned on according to the temperature difference between the indoor and outdoor of the building to absorb the heat of the building wall and transfer it to the soil, thereby reducing the cooling demand of the building.

[0039] The embodiments of the present invention are described in detail above with reference to the accompanying drawings, but the present invention is not limited thereto. Various changes can be made within the knowledge scope of those skilled in the art without departing from the purpose of the present invention.

Claims

1. A solar energy storage system coupled with a soil source heat pump for heating, characterized in that: It includes a solar thermal photovoltaic integrated subsystem (1), an energy storage subsystem (2) and a user end (3); The solar thermal photovoltaic integrated subsystem (1) is used to power the entire system and store energy for heating the soil across seasons; The energy storage subsystem (2) is used to exchange heat with the solar thermal photovoltaic integrated subsystem (1), store thermal energy and supply it to the user end (3); In the non-heating season, the solar thermal photovoltaic integrated subsystem (1) transmits heat to the energy storage subsystem (2), and the solar energy is converted into thermal energy and stored in the soil; During the heating season, the thermal energy stored in the soil is transferred to the user end (3) for use by the user after heat exchange through the energy storage subsystem (2).

2. The solar energy storage system for inter-seasonal energy storage and ground source heat pump coupled heating system according to claim 1 is characterized in that: The solar thermal photovoltaic integrated subsystem (1) includes a solar thermal photovoltaic integrated component (101), an inverter (102) and a battery (103); Thermal energy and electrical energy are generated by a solar thermal photovoltaic integrated component (101); the thermal energy is transmitted to an energy storage subsystem (2), and the electrical energy is transmitted to a storage battery (103) for storage via an inverter (102).

3. The solar energy cross-seasonal energy storage and soil source heat pump coupled heating system according to claim 2 is characterized in that: The energy storage subsystem (2) includes a first heat exchanger (201), a water tank (202), a first three-way valve (203), a first circulation pump (204), a second three-way valve (205), a second heat exchanger (206), a second circulation pump (207), a ground source heat pump (208), a first buried pipe (209), a second buried pipe (210), a boiler (211), a third circulation pump (212), and a valve (213); The heat generated by the solar thermal photovoltaic integrated component (101) is exchanged with the energy storage subsystem (2) in the first heat exchanger (201) via a water path; The first output end of the first heat exchanger (201) is connected to the water tank (202), and the second output end of the first heat exchanger (201) is transported to the solar thermal photovoltaic integrated assembly (101) through the fourth circulation pump (104); The first output end of the water tank (202) is connected to the first three-way valve (203), and the second output end is connected to the input end of the first heat exchanger (201) through the valve (213); One end of the first three-way valve (203) is connected to the first end of the second three-way valve (205) via the first circulation pump (204), and the other end is connected to the boiler (211) via the third circulation pump (212), and the output end of the boiler (211) is connected to the first end of the second three-way valve; The second end of the second three-way valve (205) is connected to the input end of the second heat exchanger (206), and the third end is connected to the second buried pipe (210); the first output end of the second heat exchanger (206) is connected to the user end (3) via the second circulation pump (207); the return pipe of the user end (3) is connected to the input end of the second heat exchanger (206); the second output end of the second heat exchanger (206) is connected to the second buried pipe (210); the return end of the second buried pipe (210) is connected to the input end of the first heat exchanger (201); A circulation loop is formed between the soil source heat pump (208), the user end (3) and the first buried pipe (209); in the heating season, the user end (3) is heated via the soil source heat pump (208) and the first buried pipe (209).

4. The solar energy cross-seasonal energy storage and ground source heat pump coupled heating system according to claim 3 is characterized in that: The buried depths of the first buried pipe (209) and the second buried pipe (210) are between 50 and 80 m.

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