Energy underground structure energy supply system based on photovoltaic waste heat and installation method

Abstract

The invention discloses an energy underground structure energy supply system based on photovoltaic waste heat and an installation method, the energy underground structure energy supply system comprises a ground source heat pump system, a photovoltaic system, an energy storage system and an intelligent direct current power distribution system, and the ground source heat pump system and electric equipment are connected to the intelligent direct current power distribution system through a voltage adapter; the photovoltaic system and the energy storage system are connected into the intelligent direct-current power distribution system through the photovoltaic converter and the energy storage converter respectively, and the ground source heat pump system is divided into a heat pump unit branch, a heat storage box branch and an underground energy structure branch which are connected through the water collecting and distributing device. According to the ground source heat pump energy supply system based on photovoltaic waste heat and the installation method, the ground source heat pump system and the solar photovoltaic system are combined, the photovoltaic system meets the power requirement of a building, the ground source heat pump system achieves stable heat supply and refrigeration, the intelligent direct-current power distribution system is adopted, the intelligent direct-current power distribution system is arranged, and the energy supply efficiency is improved. Flexible interaction of the electric equipment is achieved, and energy consumption is remarkably reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of comprehensive utilization of solar energy and geothermal energy in buildings, and in particular to an energy underground structure energy supply system based on photovoltaic waste heat and an installation method thereof. Background Art

[0002] As the demand for sustainable energy solutions grows, solar energy and geothermal energy, as two highly efficient and clean energy sources, have been increasingly widely used. Solar photovoltaic technology captures solar energy through photovoltaic modules to generate electricity to meet the daily electricity needs of commercial and residential buildings and industrial facilities. However, during the operation of the photovoltaic system, a large amount of photovoltaic waste heat is generated that is not fully utilized. This not only increases the operating temperature of the photovoltaic modules and reduces the power generation efficiency, but also may accelerate the aging of the system and shorten its service life.

[0003] On the other hand, the ground source heat pump technology used to obtain geothermal energy also has the problem of temperature imbalance in practical applications. Long-term large-scale heat extraction causes thermal interference to the underground environment, affecting the sustainable use of geothermal resources. Therefore, in order to solve the limitations of traditional single technology applications in energy conversion, it is urgent to propose an energy underground energy supply system based on photovoltaic waste heat and its installation method, combining photovoltaic power generation with geothermal energy supply to achieve efficient photovoltaic power generation, provide effective energy supply solutions for buildings, and promote more efficient energy utilization. Summary of the invention

[0004] The purpose of the present invention is to provide an underground structure energy supply system based on photovoltaic waste heat and an installation method. By combining a ground source heat pump system and a solar photovoltaic system, the photovoltaic system meets the power demand of the building, and the ground source heat pump system achieves stable heating and cooling. An intelligent DC power distribution system is adopted and equipped with an intelligent DC power distribution system.

[0005] The present invention provides an energy underground structure energy supply system based on photovoltaic waste heat and an installation method, comprising a ground source heat pump system, a photovoltaic system, an energy storage system and an intelligent DC power distribution system. The ground source heat pump system and electrical equipment are connected to the intelligent DC power distribution system through a voltage adapter, and the photovoltaic system and the energy storage system are connected to the intelligent DC power distribution system through a photovoltaic converter and an energy storage converter, respectively. The ground source heat pump system is divided into a heat pump unit branch, a heat storage tank branch, and an energy underground structure branch, and they are connected through a manifold.

[0006] Preferably, the water collector and water distributor consists of a water collector and a water distributor.

[0007] Preferably, the photovoltaic system consists of a photovoltaic panel, a photovoltaic converter and a heat storage box; the photovoltaic panel includes a photovoltaic cell, an absorption plate, a heat exchange tube, an insulating back plate and an adhesive material, and the heat absorbed by the absorption plate is transferred to the heat storage box for storage through the heat exchange tube; the heat storage box forms a heat collection loop through the heat exchange tube; the adhesive material tightly bonds the photovoltaic cell and the absorption plate.

[0008] Preferably, the energy storage system includes an energy storage converter and an electrochemical battery, and participates in the storage and release of electric energy through different working modes of the energy storage converter.

[0009] Preferably, the intelligent DC power distribution system includes a power supply device, an intelligent monitoring system, a voltage adapter and a DC bus.

[0010] Preferably, the photovoltaic system feeds electrical energy into a DC power distribution circuit via a photovoltaic converter.

[0011] Preferably, the intelligent DC distribution system is connected to the urban power grid through an AC-DC converter; the photovoltaic system and the energy storage system are connected to the DC780V DC bus through the photovoltaic converter and the energy storage converter respectively; the ground source heat pump system and electrical equipment are connected to the DC bus through a voltage adapter that converts the voltage to DC375V or DC48V and then connected to the DC bus.

[0012] Preferably, the intelligent monitoring system includes a voltmeter, a power meter and a shunt meter.

[0013] Preferably, the method comprises the following steps: S1. The energy piles and buried pipes in the energy underground structure branch are connected in parallel to the total inlet and outlet water pipelines; the total inlet and outlet water pipelines are connected to the water distributor and the water collector respectively; S2. The outlet pipe of the heat pump in the branch of the heat pump unit is connected to the water distributor, and the inlet pipe is connected to the water collector; S3, the outlet pipe in the heat storage tank branch is connected to the water distributor, and the inlet pipe is connected to the water collector; S4. Photovoltaic cells are installed as the top layer of photovoltaic panels, and an absorber plate is placed below them; heat exchange tubes are arranged below the absorber plate in a reciprocating manner, and ensure that they form a closed loop with the heat storage tank, and transport the photovoltaic waste heat to the heat storage tank through heat exchange; an insulating back plate is installed at the bottom; S5. The voltmeter is connected to the DC bus, the power meter is connected in series with the photovoltaic converter and then connected to the DC bus, the flow meter in the ground source heat pump system is connected in series with the voltage adapter and then connected to the DC bus; the flow meter of the energy storage system is connected in series with the energy storage converter and then connected to the DC bus.

[0014] Therefore, the present invention adopts the above-mentioned underground structure energy supply system and installation method based on photovoltaic waste heat. By combining the ground source heat pump system and the solar photovoltaic system, the photovoltaic system meets the electricity needs of the building, and the ground source heat pump system realizes stable heating and cooling. An intelligent DC distribution system is adopted and equipped with an intelligent DC distribution system to realize flexible interaction of electrical equipment and significantly reduce energy consumption.

[0015] The technical solution of the present invention is further described in detail below through the accompanying drawings and embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of an underground structure energy supply system based on photovoltaic waste heat and an installation method of the present invention; Figure 2 A schematic diagram of system connection of an underground structure energy supply system and installation method based on photovoltaic waste heat according to the present invention; Figure 3 It is a schematic diagram of the cross-sectional structure of a photovoltaic panel of an underground structure energy supply system and installation method based on photovoltaic waste heat of the present invention.

[0017] Reference numerals 1. Ground source heat pump system; 101. Collector and distributor; 1011. Collector; 1012. Distributor; 103. Heat pump unit branch; 104. Heat storage tank branch; 105. Energy underground structure branch; 1051. Energy pile; 1052. Buried pipe; 1053. Total inlet and outlet water pipeline; 106. Heat pump; 2. Photovoltaic system; 201. Photovoltaic panel; 202. Photovoltaic converter; 2011. Photovoltaic cell; 2012. Absorber; 2013. Heat exchange tube; 2014, thermal insulation backboard; 2015, adhesive material; 203, heat storage box; 3, energy storage system; 301, energy storage converter; 302, electrochemical battery; 4, intelligent DC power distribution system; 401, power supply equipment; 402, power equipment; 403, intelligent detection system; 404, voltage adapter; 405, DC bus; 406, AC-DC converter; 407, urban power grid; 4031, voltmeter; 4032, power meter; 4033, flow meter. DETAILED DESCRIPTION

[0018] The technical solution of the present invention is further described below through the accompanying drawings and embodiments.

[0019] Unless otherwise defined, technical or scientific terms used in the present invention shall have the common meanings understood by one having ordinary skills in the field to which the present invention belongs.

[0020] The words "first", "second" and similar terms used in the present invention do not indicate any order, quantity or importance, but are only used to distinguish different components. Words such as "include" or "comprises" and similar terms mean that the elements or objects appearing before the word include the elements or objects listed after the word and their equivalents, without excluding other elements or objects. Words such as "connect" or "connected" and similar terms are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "Up", "down", "left", "right" and the like are only used to indicate relative positional relationships. When the absolute position of the object being described changes, the relative positional relationship may also change accordingly.

[0021] Embodiment 1 like Figure 1-Figure 3 As shown, the present invention is an energy underground structure energy supply system based on photovoltaic waste heat and an installation method, comprising a ground source heat pump system 1, a photovoltaic system 2, an energy storage system 3, and an intelligent DC power distribution system 4; the ground source heat pump system 1 is divided into a heat pump unit branch 103, a heat storage tank branch 104, and an energy underground structure branch 105, so as to realize the transfer and circulation of heat energy. And connected through a collector and distributor 101, the collector and distributor 101 is composed of a collector 1011 and a distributor 1012; the heat pump unit branch 103 can realize the circulation of heat exchange liquid to ensure that the system always maintains efficient heat exchange performance during operation; the heat storage tank branch 104 transfers the collected waste heat to the heat pump unit branch 103 to increase the thermal energy utilization efficiency in the heating mode; the energy underground structure branch 105 seasonally exchanges heat with the soil to jointly meet the heating and cooling needs of the building.

[0022] The photovoltaic system 2 is composed of a photovoltaic panel 201 made of multi-layer materials, a photovoltaic converter 202 and a heat storage tank 203; the photovoltaic panel 201 includes a photovoltaic cell 2011, an absorption panel 2012, a heat exchange tube 2013, a heat insulation back plate 2014, and a bonding material 2015; the heat absorbed by the absorption panel 2012 is transferred to the heat storage tank 203 for storage through the heat exchange tube 2013; the heat storage tank 203 forms a heat collection loop through the heat exchange tube 2013, so that the residual heat absorbed by the photovoltaic panel 201 can be effectively stored in the heat storage tank 203. The heat collected by the absorption panel 2012 is transferred to the heat storage tank 203 through the heat exchange tube 2013 for storage, so that the heat can be transported to the ground source heat pump system 1 when the heating demand is at a peak, so as to assist in providing the heating demand of the building. The bonding material 2015 tightly bonds the photovoltaic cell 2011 and the absorption panel 2012.

[0023] The energy storage system includes an energy storage converter 301 and an electrochemical battery 302, and participates in the storage and release of electric energy through different working modes of the energy storage converter.

[0024] The intelligent DC power distribution system 4 includes a power supply device 401, an intelligent monitoring system 403, a voltage adapter 404, and a DC bus 405. The ground source heat pump system 1 and the power equipment 402 are connected to the intelligent DC power distribution system through the voltage adapter 404, and the photovoltaic system 2 and the energy storage system 3 are connected to the intelligent DC power distribution system through the photovoltaic converter 202 and the energy storage converter 301 respectively. The photovoltaic system 2 feeds the electric energy into the DC power distribution circuit through the photovoltaic converter 202, and participates in the power consumption of the circuit equipment and the storage of the energy storage system 3.

[0025] The intelligent DC power distribution system 4 is connected to the city power grid 407 through the AC-DC converter 406; the photovoltaic system 2 and the energy storage system 3 are connected to the DC780V DC bus 405 through the photovoltaic converter 202 and the energy storage converter 301 respectively; the ground source heat pump system 1 and the power equipment 402 are connected to the DC bus 405 by converting the voltage to a suitable voltage through the voltage adapter 404. The voltage adapter 404 changes the voltage to DC375V or DC48V and connects to the DC bus 405. The two voltages meet most daily voltage requirements and the power requirements of low-power equipment. The intelligent monitoring system 403 includes a voltmeter 4031, a power meter 4032 and a shunt meter 4033; the voltmeter 4031 is used to monitor the voltage change of the DC bus and adjust the three flexible loads according to the voltage fluctuation, the power meter 4032 monitors the photovoltaic power generation power, and the shunt meter 4033 monitors the power consumption of each power branch.

[0026] The method comprises the following steps: S1, the energy pile 1051 and the buried pipe 1052 in the energy underground structure branch 105 are connected in parallel to the total inlet and outlet water pipe 1053; the total inlet and outlet water pipe 1053 is respectively connected to the water distributor 1012 and the water collector 1011 to form a closed circulation system.

[0027] S2. The water outlet pipe of the heat pump 106 in the heat pump unit branch 103 is connected to the water distributor 1012, and the water inlet pipe is connected to the water collector 1011 to ensure that the water circulates smoothly in the whole system.

[0028] S3, the water outlet pipe in the heat storage tank branch 104 is connected to the water distributor 1012, and the water inlet pipe is connected to the water collector 1011, completing the connection between the heat storage tank and the main circulation system.

[0029] S4. Photovoltaic cell 2011 is installed as the top layer of photovoltaic panel, and absorption plate 2012 is placed below it to absorb photovoltaic waste heat; heat exchange tube 2013 is arranged below the absorption plate in a reciprocating manner, and ensures that it forms a closed loop with heat storage tank 203, and transports photovoltaic waste heat to the heat storage tank through heat exchange; thermal insulation back plate 2014 is installed at the bottom to prevent heat loss.

[0030] S5, the voltmeter 4031 is connected to the DC bus 405 for real-time monitoring of voltage fluctuations; the power meter 4032 is connected in series with the photovoltaic converter 202 and then connected to the DC bus 405 to record power; the flow meter 4033 in the ground source heat pump system 1 is connected in series with the voltage adapter 404 and then connected to the DC bus 405; the flow meter of the energy storage system 3 is connected in series with the energy storage converter 301 and then connected to the DC bus 405 to achieve comprehensive monitoring of the system.

[0031] Embodiment 2 like Figure 1 and 2 As shown, the photovoltaic waste heat energy underground structure energy supply system is mainly composed of a ground source heat pump system 1, a photovoltaic system 2, an energy storage system 3 and an intelligent DC distribution system 4. The ground source heat pump system 1 divides the pipeline into three branches through a manifold: a heat pump unit branch 103, a heat storage tank branch 104 and an energy underground structure branch 105, thereby realizing the transfer and circulation of heat energy. The heat pump unit branch 103 is responsible for the working cycle of the heat exchange liquid to ensure that the system always maintains efficient heat exchange performance during operation; the heat storage tank branch 104 is used to collect the waste heat in the heat storage tank 203 and transfer it to the heat pump unit branch 103 to increase the thermal energy utilization efficiency in the heating mode; the energy underground structure branch 105 seasonally exchanges heat with the soil, which helps the system meet the heating and cooling needs of the building and achieve energy-saving operation throughout the year.

[0032] like Figure 3 As shown, the photovoltaic system 2 is composed of a photovoltaic panel 201, a photovoltaic converter 202 and a heat storage tank 203. The photovoltaic panel 201 is the core component of the system, and is made of multi-layer materials, including a photovoltaic cell 2011, an absorption panel 2012, a heat exchange tube 2013 and a heat insulation back plate 2014. The heat exchange tube 2013 is connected to the heat storage tank 203 to form a heat collection loop, so that the waste heat absorbed by the photovoltaic panel 201 can be effectively stored in the heat storage tank 203. The heat collected by the absorption panel 2012 is transferred to the heat storage tank 203 through the heat exchange tube 2013 for storage, so that the heat can be transported to the ground source heat pump system 1 when the heating demand is peak, so as to assist in providing the heating demand of the building.

[0033] like Figure 2As shown, when the building has a heating demand and the water temperature of the heat storage tank is sufficient, the energy underground structure branch 105 and the heat storage tank branch 104 will jointly provide thermal energy support for the heat pump unit branch 103 to more efficiently meet the heating demand of the building. In this mode, the heat pump unit branch 103, the energy underground structure branch 105 and the heat storage tank branch 104 are all kept open. The fluid medium from the energy pile 1051 and the heat storage tank 203 is mixed in the water collector 1011 and enters the heat pump 106 unit for heat exchange. After the heat exchange is completed, the fluid medium flows back to their respective branches through the water distributor 1012 to form a stable circulation process. In this mode, by integrating photovoltaic waste heat and ground source heat pump system, the heating efficiency is further improved to meet the energy-saving needs of the building.

[0034] Embodiment 3 like Figure 1 and Figure 2 As shown, the photovoltaic waste heat energy underground structure energy supply system is mainly composed of a ground source heat pump system 1, a photovoltaic system 2, an energy storage system 3 and an intelligent DC distribution system 4. The ground source heat pump system 1 divides the pipeline into three branches through a manifold 101: a heat pump unit branch 103, a heat storage tank branch 104 and an energy underground structure branch 105, thereby realizing the transfer and circulation of heat energy. The heat pump unit branch 103 is responsible for the working cycle of the heat exchange liquid to ensure that the system always maintains efficient heat exchange performance during operation; the heat storage tank branch 104 is used to collect the waste heat in the heat storage tank and transfer it to the heat pump unit branch 103 to increase the thermal energy utilization efficiency in the heating mode; the energy underground structure branch 105 seasonally exchanges heat with the soil, which helps the system meet the heating and cooling needs of the building and achieve energy-saving operation throughout the year.

[0035] like Figure 3 As shown, the photovoltaic system 2 is composed of a photovoltaic panel 201, a photovoltaic converter 202 and a heat storage tank 203. The photovoltaic panel 201 is the core component of the system, and is made of multi-layer materials, including a photovoltaic cell 2011, an absorption panel 2012, a heat exchange tube 2013 and a heat insulation back plate 2014. The heat exchange tube 2013 is connected to the heat storage tank 203 to form a heat collection loop, so that the waste heat absorbed by the photovoltaic panel 201 can be effectively stored in the heat storage tank 203. The heat collected by the absorption panel 2012 is transferred to the heat storage tank 203 through the heat exchange tube 2013 for storage, so that the heat can be transported to the ground source heat pump system 1 when the heating demand is peak, so as to assist in providing the heating demand of the building.

[0036] like Figure 2As shown, this mode can be selected when the building does not need heating or cooling and the water temperature of the heat storage tank 203 is sufficient. In this operating mode, the heat pump unit branch 103 remains closed, while the energy underground structure branch 105 and the heat storage tank branch 104 are in the open state. At this time, the fluid medium from the heat storage tank 203 flows to the underground energy structure branch 105 through the water collector 1011, completes the heat exchange in the soil, and then flows back to the heat storage tank 203 through the water distributor 1012. In this mode, by realizing fluid circulation and supplementing heat to the soil, the temperature balance time of the soil is further extended, laying the foundation for the stable operation of the ground source heat pump system during peak demand, thereby improving the overall energy efficiency of the system.

[0037] Therefore, the present invention adopts the above-mentioned underground structure energy supply system and installation method based on photovoltaic waste heat. By combining the ground source heat pump system and the solar photovoltaic system, the photovoltaic system meets the electricity needs of the building, and the ground source heat pump system realizes stable heating and cooling. An intelligent DC distribution system is adopted and equipped with an intelligent DC distribution system to realize flexible interaction of electrical equipment and significantly reduce energy consumption.

[0038] The above embodiments are only used to illustrate the technical solution of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that they can still modify or replace the technical solution of the present invention with equivalents, and these modifications or equivalent replacements cannot cause the modified technical solution to deviate from the spirit and scope of the technical solution of the present invention.

Claims

1. An underground structure energy supply system based on photovoltaic waste heat, characterized in that: It includes a geothermal heat pump system, a photovoltaic system, an energy storage system and an intelligent DC distribution system. The geothermal heat pump system and electrical equipment are connected to the intelligent DC distribution system through a voltage adapter. The photovoltaic system and the energy storage system are connected to the intelligent DC distribution system through a photovoltaic converter and an energy storage converter respectively. The geothermal heat pump system is divided into a heat pump unit branch, a heat storage tank branch and an energy underground structure branch, and they are connected through a manifold.

2. According to claim 1, an underground structure energy supply system based on photovoltaic waste heat is characterized in that: The water collector and water distributor consists of a water collector and a water distributor.

3. According to claim 1, an underground structure energy supply system based on photovoltaic waste heat is characterized in that: The photovoltaic system consists of photovoltaic panels, photovoltaic converters and heat storage boxes; photovoltaic panels include photovoltaic cells, absorption panels, heat exchange tubes, insulation backboards and adhesive materials. The heat absorbed by the absorption panels is transferred to the heat storage box for storage through the heat exchange tubes; the heat storage box forms a heat collection loop through the heat exchange tubes; the adhesive materials tightly bond the photovoltaic cells and absorption panels.

4. According to claim 1, an underground structure energy supply system based on photovoltaic waste heat is characterized in that: The energy storage system includes an energy storage converter and an electrochemical battery, and participates in the storage and release of electrical energy through different working modes of the energy storage converter.

5. According to claim 1, an underground structure energy supply system based on photovoltaic waste heat is characterized in that: The intelligent DC power distribution system includes power supply equipment, intelligent monitoring system, voltage adapter and DC bus.

6. The underground structure energy supply system based on photovoltaic waste heat according to claim 1 is characterized in that: The photovoltaic system feeds electrical energy into the DC distribution circuit through photovoltaic converters.

7. The underground structure energy supply system based on photovoltaic waste heat according to claim 1 is characterized in that: The intelligent DC power distribution system is connected to the urban power grid through an AC-DC converter; the photovoltaic system and the energy storage system are connected to the DC780V DC bus through photovoltaic converters and energy storage converters respectively; the ground source heat pump system and electrical equipment are connected to the DC bus through voltage adapters that convert the voltage to DC375V or DC48V and then connected to the DC bus.

8. The underground structure energy supply system based on photovoltaic waste heat according to claim 1 is characterized in that: The intelligent monitoring system includes voltmeter, power meter and branch meter.

9. An underground structure energy supply system and installation method based on photovoltaic waste heat as described in claims 1-8, comprising the following steps: S1. The energy piles and buried pipes in the energy underground structure branch are connected in parallel to the total inlet and outlet water pipelines; the total inlet and outlet water pipelines are connected to the water distributor and the water collector respectively; S2. The outlet pipe of the heat pump in the branch of the heat pump unit is connected to the water distributor, and the inlet pipe is connected to the water collector; S3, the outlet pipe in the heat storage tank branch is connected to the water distributor, and the inlet pipe is connected to the water collector; S4. Photovoltaic cells are installed as the top layer of photovoltaic panels, and an absorber plate is placed below them; heat exchange tubes are arranged below the absorber plate in a reciprocating manner, and ensure that they form a closed loop with the heat storage tank, and transport the photovoltaic waste heat to the heat storage tank through heat exchange; an insulating back plate is installed at the bottom; S5. The voltmeter is connected to the DC bus, the power meter is connected in series with the photovoltaic converter and then connected to the DC bus, the flow meter in the ground source heat pump system is connected in series with the voltage adapter and then connected to the DC bus; the flow meter of the energy storage system is connected in series with the energy storage converter and then connected to the DC bus.

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