A multi-energy complementary integrated energy system

Abstract

The application discloses a multi-energy complementary comprehensive energy system, which is composed of a photovoltaic panel, two circulating pumps, four three-way valves, a heat storage tank, a liquid storage tank, an air source heat exchanger, a water source heat exchanger, a four-way reversing valve, a compressor, an air cooler, a thermoelectric cooler (TEC), two expansion valves, a flasher, a check valve, a manual regulating valve, an MPPT controller, a storage battery and an inverter. The system realizes stable operation of the driving heat pump compressor and the multiple circulating water pumps through the cooperation of the PV photovoltaic panel and the inverter. The hot water generated by the light-heat circuit of the system is stored in the heat storage tank and can be used as user hot water or a heat pump heat source. The flasher of the system generates medium-pressure steam during the operation of the system and introduces the medium-pressure steam into the air supplementing inlet of the compressor through an air supplementing pipeline to form an air supplementing path. The multi-energy complementary comprehensive energy system has the characteristics of energy efficient coupling, good season adaptability and multi-energy complementation and is suitable for distributed energy system scenes.

Description

Technical Field

[0001] This invention belongs to the field of energy utilization and energy conservation technology, and specifically designs a multi-energy complementary integrated energy system. Background Technology

[0002] With increasing environmental pollution and a worsening energy crisis, the development of new energy sources and the efficient utilization of traditional energy have become a focus of global engineering applications. Solar energy, as a clean and safe renewable energy source, has become a key pathway for the global energy system to shift from a fossil fuel-based model to one dominated by renewable energy. Photovoltaic heat pump systems, due to their use of energy-saving technologies and clean renewable energy, can better promote energy transformation and comprehensive energy conservation and emission reduction in the building sector, and have significant practical and engineering value in achieving low-carbon and zero-carbon buildings.

[0003] However, existing solar photovoltaic / heat pump systems still have some problems. Firstly, they cannot operate under specific conditions, such as insufficient sunlight causing the photovoltaic system to malfunction, high summer temperatures preventing complete heat dissipation from the photovoltaic panels, and significant increases in heat pump exhaust temperature at low temperatures, affecting the overall system performance and operational stability. Secondly, most designs fail to meet the multi-energy integration requirements of combined heat, power, and cooling systems in building scenarios; most systems only consider winter heating or domestic hot water supply, neglecting summer cooling. Finally, regarding the performance degradation of CO2 heat pump systems at low temperatures, enthalpy enhancement through gas injection should be used to improve system performance under low-temperature conditions. Therefore, it is necessary to design a multi-energy complementary integrated energy system to solve the above technical problems. Summary of the Invention

[0004] To address the above problems, this invention provides a multi-energy complementary integrated energy system, which has the advantages of high energy efficiency, strong seasonal adaptability, and multi-energy complementarity, and is suitable for distributed energy system scenarios.

[0005] The purpose of this invention is achieved through the following technical solution: a multi-energy complementary integrated energy system, which comprises: a photovoltaic panel (1), a circulating pump 1 (2), a solenoid valve (3), a thermal storage tank (4), a liquid storage tank (5), a circulating pump 2 (6), an air source heat exchanger (7), a three-way valve (8), a water source heat exchanger (9), a three-way valve (10), a three-way valve (11), a three-way valve (12), a compressor (13), a one-way valve (14), a manual regulating valve (15), a four-way reversing valve (16), an expansion valve 1 (17), a flash generator (18), an expansion valve 2 (19), an air cooler (20), a TEC (21), an MPPT controller (22), a battery (23), and an inverter (24).

[0006] This invention relates to a multi-energy complementary integrated energy system. The photovoltaic panel (1) is used for solar photovoltaic conversion. It is connected to the battery (23) through the MPPT controller (22) to store electrical energy and supplies power to the compressor (13) through the inverter (24). The photovoltaic system circulates through the circulation pump 1 (2) to transfer the heat energy received by the PV photovoltaic panel (1) to the heat storage tank (4). The cold fluid in the heat storage tank (4) returns to the photovoltaic panel (1) through the solenoid valve (3). When the heat storage tank (4) needs to release heat, the liquid storage tank (5) supplies cold fluid to discharge the hot fluid in the heat storage tank (4) for use on the user side and for heat exchange with the refrigerant in the water source heat exchanger (9).

[0007] This invention relates to a multi-energy complementary integrated energy system. When the system is in heating mode, the manual regulating valve (15) is closed, the three-way valve (12) port a is connected to the water source heat exchanger (9), the three-way valve (8) port c is connected to the three-way valve (11) port b, the three-way valve (11) port a is connected to the three-way valve (10) port b, the three-way valve (10) port b is connected to the four-way reversing valve (16), and the four-way reversing valve (16) is adjusted to connect the exhaust port of the compressor (13) to the air cooler (20). The refrigerant flows in a cycle through the compressor (13), the four-way reversing valve (16), the air cooler (20), the expansion valve 2 (19), the flash evaporator (18), the expansion valve 1 (17), the three-way valve (12), the water source heat exchanger (9), the three-way valve (8), the three-way valve (11), the three-way valve (10), the four-way reversing valve (16), and the compressor (13).

[0008] This invention relates to a multi-energy complementary integrated energy system. When the system is in low-temperature heating mode, the manual regulating valve (15) and the one-way valve (14) are opened, the three-way valve (12) is connected to the water source heat exchanger (9) and the three-way valve (11) is closed. The refrigerant undergoes gas-liquid separation in the direction of sequential flow through the compressor (13), the four-way reversing valve (16), the air cooler (20), the expansion valve 2 (19), and the flash evaporator (18). The gaseous refrigerant flows in the direction of sequential flow through the manual regulating valve (15), the one-way valve (14), and the compressor (13), while the liquid refrigerant flows in the direction of sequential flow through the expansion valve 1 (17), the three-way valve (12), the water source heat exchanger (9), the three-way valve (8), the air source heat exchanger (7), the three-way valve (10), the four-way reversing valve (16), and the compressor (13).

[0009] This invention relates to a multi-energy complementary integrated energy system. When the system is in cooling mode, the manual regulating valve (15) is closed, the b port of the three-way valve (10) is connected to the a port of the three-way valve (11), the b port of the three-way valve (11) is connected to the c port of the three-way valve (8), the b port of the three-way valve (8) is connected to the water source heat exchanger (9), and the four-way reversing valve (16) is adjusted so that the discharge port of the compressor (13) is connected to the c port of the three-way valve (10). The refrigerant circulates in the following order: compressor (13), four-way reversing valve (16), three-way valve (10), three-way valve c (11), three-way valve (8), water source heat exchanger (9), three-way valve (12), expansion valve 1 (17), flash evaporator (18), expansion valve 2 (19), TEC (21), air cooler (20), four-way reversing valve (16), and compressor (13).

[0010] This invention relates to a multi-energy complementary integrated energy system. In the case of insufficient sunlight, the system uses a liquid storage tank (5) to pump cold fluid into a heat storage tank (4) via a circulation pump (6). The heat stored in the heat storage tank is then exchanged between the fluid and the refrigerant in the water source heat exchanger (9) for subsequent heat pump system circulation. Alternatively, the three-way valve (10) is connected to port a with the air source heat exchanger (7), the three-way valve (8) is connected to port c with port b with the three-way valve (11), and the three-way valve (11) is connected to port c with port b with the three-way valve (12). The refrigerant flows sequentially through the compressor (13), four-way reversing valve (16), three-way valve (10), air source heat exchanger (7), three-way valve (8), three-way valve (11), three-way valve (12), expansion valve 1 (17), flash evaporator (18), expansion valve 2 (19), and TEC. (21), air cooler (20), four-way reversing valve (16), compressor (13) circulate in the direction of flow.

[0011] Compared with the prior art, the beneficial effects of the present invention are: the multi-energy complementary integrated energy system;

[0012] (1) Deeply couple the flash gas replenishment technology with the PV / T heat pump system, and combine the multi-source synergy mechanism of photovoltaic, photothermal, refrigeration and heat pump. Through the control and switching of three-way valve, four-way reversing valve and manual regulating valve, the system can achieve flexible switching of multiple modes, adaptability to multiple working conditions and efficient energy coupling, and adapt to dynamic changes in cold and heat load.

[0013] (2) Introduce energy storage branch in photovoltaic system to couple photovoltaic system with heat pump system, so that heat generated by photovoltaic system is converted into heat required to provide water for users and heat pump system, so as to improve the photoelectric conversion efficiency of photovoltaic panel while making efficient use of energy.

[0014] (3) The system introduces a flash evaporator and a gas replenishment circuit. By using secondary throttling and medium-pressure gas replenishment, the compressor efficiency is improved, the throttling process is optimized, and the expansion efficiency is improved. This can significantly enhance the cooling / heating performance of the heat pump under partial load and low temperature conditions. Attached Figure Description

[0015] Figure 1 A process flow diagram for a multi-energy complementary integrated energy system;

[0016] Figure 2 A schematic diagram of the heating operation of a multi-energy complementary integrated energy system;

[0017] Figure 3 A schematic diagram of the low-temperature heating operation of a multi-energy complementary integrated energy system;

[0018] Figure 4 A schematic diagram of the cooling operation of a multi-energy complementary integrated energy system;

[0019] Figure 5 A schematic diagram of a multi-energy complementary integrated energy system operating under no-light conditions;

[0020] In the diagram: 1-Photovoltaic panel, 2-Circulation pump 1, 3-Electromagnetic, 4-Energy storage tank, 5-Liquid storage tank, 6-Circulation pump 2, 7-Air source heat exchanger, 8-Three-way valve, 9-Water source heat exchanger, 10-Three-way valve, 11-Three-way valve, 12-Three-way valve, 13-Compressor, 14-Check valve, 15-Manual regulating valve, 16-Four-way reversing valve, 17-Expansion valve 1, 18-Flash generator, 19-Expansion valve 2, 20-Air cooler, 21-TEC, 22-MPPT controller, 23-Battery, 24-Inverter. Detailed Implementation

[0021] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0022] The multi-energy complementary integrated energy system of the present invention, such as Figure 1As shown, the system comprises: a photovoltaic panel (1), a circulating pump 1 (2), a solenoid valve (3), a thermal storage tank (4), a liquid storage tank (5), a circulating pump 2 (6), an air source heat exchanger (7), a three-way valve (8), a water source heat exchanger (9), a three-way valve (10), a three-way valve (11), a three-way valve (12), a compressor (13), a check valve (14), a manual regulating valve (15), a four-way reversing valve (16), an expansion valve 1 (17), a flash generator (18), an expansion valve 2 (19), an air cooler (20), a TEC (21), an MPPT controller (22), a battery (23), and an inverter (24).

[0023] The multi-energy complementary integrated energy system of the present invention includes a photovoltaic panel (1) for solar photovoltaic conversion, which is connected to a battery (23) via an MPPT controller (22) to store electrical energy and supplies power to a compressor (13) via an inverter (24). The photovoltaic system circulates through a circulation pump 1 (2) to transfer the heat energy received by the PV photovoltaic panel (1) to a heat storage tank (4). The cold fluid in the heat storage tank (4) returns to the photovoltaic panel (1) through a solenoid valve (3). When the heat storage tank (4) needs to release heat, a liquid storage tank (5) supplies cold fluid to discharge the hot fluid in the heat storage tank (4) for use on the user side and for heat exchange with the refrigerant in the water source heat exchanger (9). The heat storage tank (4) in the photovoltaic system plays the role of storing the heat required for cooling the photovoltaic panel (1), which improves the photovoltaic conversion efficiency of the photovoltaic panel (1) while making efficient use of energy.

[0024] The multi-energy complementary integrated energy system of the present invention, such as Figure 2 As shown, when the system is in heating mode, the manual regulating valve (15) is closed, the three-way valve (12) port a is connected to the water source heat exchanger (9), the three-way valve (8) port c is connected to the three-way valve (11) port b, the three-way valve (11) port a is connected to the three-way valve (10) port b, the three-way valve (10) port b is connected to the four-way reversing valve (16), and the four-way reversing valve (16) is adjusted to connect the exhaust port of the compressor (13) to the air cooler (20). The refrigerant flows in the following order: compressor (13), four-way reversing valve (16), air cooler (20), expansion valve 2 (19), flash evaporator (18), expansion valve 1 (17), three-way valve (12), water source heat exchanger (9), three-way valve (8), three-way valve (11), three-way valve (10), four-way reversing valve (16), and compressor (13). The flash generator (18) acts as a buffer for the working fluid in the heating mode.

[0025] The multi-energy complementary integrated energy system of the present invention, such as Figure 3 As shown, when the system is in low-temperature heating mode, open the manual regulating valve (15) and the one-way valve (14), adjust the three-way valve (12) a port to connect to the water source heat exchanger (9), and close the three-way valve (11). The refrigerant undergoes gas-liquid separation in the order of flowing through the compressor (13), the four-way reversing valve (16), the air cooler (20), the expansion valve 2 (19), and the flash evaporator (18). The gaseous refrigerant flows in the order of flowing through the manual regulating valve (15), the one-way valve (14), and the compressor (13), while the liquid refrigerant flows in the order of flowing through the expansion valve 1 (17), the three-way valve (12), the water source heat exchanger (9), the three-way valve (8), the air source heat exchanger (7), the three-way valve (10), the four-way reversing valve (16), and the compressor (13). The flash evaporator (18) plays a role in gas-liquid separation in low-temperature heating mode, and improves compression efficiency through secondary throttling and medium-pressure gas replenishment. The air source heat exchanger (7) plays a role in increasing the superheat of the compressor inlet in the low-temperature heating mode, thereby improving the energy efficiency of the heat pump system.

[0026] The multi-energy complementary integrated energy system of the present invention, such as Figure 4 As shown, when the system is in cooling mode, the manual regulating valve (15) is closed, the three-way valve (12) port a is connected to the water source heat exchanger (9), the water source heat exchanger (9) is connected to the three-way valve (8) port b, the three-way valve (11) port a is connected to the three-way valve (10) port b, the three-way valve (10) port c is connected to the four-way reversing valve (16), and the three-way valve (10) port c is connected to the four-way reversing valve (16). The refrigerant flows in a cycle through the compressor (13), four-way reversing valve (16), three-way valve (10), three-way valve c (11), three-way valve (8), water source heat exchanger (9), three-way valve (12), expansion valve 1 (17), flash evaporator (18), expansion valve 2 (19), TEC (21), air cooler (20), four-way reversing valve (16), and compressor (13). TEC (21) plays the role of thermoelectric subcooling in the cooling mode, ensuring that the refrigerant entering the expansion valve is completely liquid, avoiding flash gas and improving system efficiency.

[0027] The multi-energy complementary integrated energy system of the present invention, such as Figure 5As shown, under insufficient light conditions, the liquid storage tank (5) uses the circulating pump 2 (6) to introduce cold fluid into the heat storage tank (4), and the heat stored in the heat storage tank is exchanged with the refrigerant in the water source heat exchanger (9) through the fluid for subsequent heat pump system circulation; or the three-way valve (10) port a is connected to the air source heat exchanger (7), the three-way valve (8) port c is connected to the three-way valve (11) port b, and the three-way valve (11) port c is connected to the three-way valve (12) port b. The refrigerant flows sequentially through the compressor (13), four-way reversing valve (16), three-way valve (10), air source heat exchanger (7), three-way valve (8), three-way valve (11), three-way valve (12), expansion valve 1 (17), flash evaporator (18), expansion valve 2 (19), TEC (21), air cooler (20), four-way reversing valve (16), and compressor (13). The air flows in a cyclical manner. The air source heat exchanger (7) functions as an evaporator in a heat pump system when the photovoltaic system is unavailable. Anything not described in detail in this specification is prior art known to those skilled in the art.

[0028] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A multi-energy complementary integrated energy system, comprising: The system consists of a photovoltaic panel (1), a circulating pump 1 (2), a solenoid valve (3), a thermal storage tank (4), a liquid storage tank (5), a circulating pump 2 (6), an air source heat exchanger (7), a three-way valve (8), a water source heat exchanger (9), a three-way valve (10), a three-way valve (11), a three-way valve (12), a compressor (13), a check valve (14), a manual regulating valve (15), a four-way reversing valve (16), an expansion valve 1 (17), a flash generator (18), an expansion valve 2 (19), an air cooler (20), a TEC (21), an MPPT controller (22), a battery (23), and an inverter (24).

2. The multi-energy complementary integrated energy system according to claim 1, characterized in that, The photovoltaic panel (1) is used for solar photovoltaic conversion. It is connected to the battery (23) through the MPPT controller (22) to store electrical energy and to supply power to the compressor (13) through the inverter (24). The photovoltaic system circulates through the circulation pump 1 (2) to transfer the heat energy received by the PV photovoltaic panel (1) to the heat storage tank (4). The cold fluid in the heat storage tank (4) returns to the photovoltaic panel (1) through the solenoid valve (3). When the heat storage tank (4) needs to release heat, the liquid storage tank (5) supplies cold fluid to discharge the hot fluid in the heat storage tank (4) for use on the user side and for heat exchange with the refrigerant in the water source heat exchanger (9).

3. The multi-energy complementary integrated energy system according to claim 1, characterized in that, When the system is in heating mode, the manual regulating valve (15) is closed, the three-way valve (12) port a is connected to the water source heat exchanger (9), the three-way valve (8) port c is connected to the three-way valve (11) port b, the three-way valve (11) port a is connected to the three-way valve (10) port b, the three-way valve (10) port b is connected to the four-way reversing valve (16), and the four-way reversing valve (16) is adjusted so that the exhaust port of the compressor (13) is connected to the air cooler (20). The refrigerant flows in a cycle through the compressor (13), the four-way reversing valve (16), the air cooler (20), the expansion valve 2 (19), the flash evaporator (18), the expansion valve 1 (17), the three-way valve (12), the water source heat exchanger (9), the three-way valve (8), the three-way valve (11), the three-way valve (10), the four-way reversing valve (16), and the compressor (13).

4. The multi-energy complementary integrated energy system according to claim 1, characterized in that, When the system is in low-temperature heating mode, open the manual regulating valve (15) and the one-way valve (14), adjust the three-way valve (12) a port to connect to the water source heat exchanger (9), close the three-way valve (11), and the refrigerant will undergo gas-liquid separation in the direction of flowing through the compressor (13), the four-way reversing valve (16), the air cooler (20), the expansion valve 2 (19), and the flash evaporator (18). The gaseous refrigerant flows in the direction of flowing through the manual regulating valve (15), the one-way valve (14), and the compressor (13), while the liquid refrigerant flows in the direction of flowing through the expansion valve 1 (17), the three-way valve (12), the water source heat exchanger (9), the three-way valve (8), the air source heat exchanger (7), the three-way valve (10), the four-way reversing valve (16), and the compressor (13).

5. The multi-energy complementary integrated energy system according to claim 1, characterized in that, When the system is in cooling mode, the manual regulating valve (15) is closed, the b port of the three-way valve (10) is connected to the a port of the three-way valve (11), the b port of the three-way valve (11) is connected to the c port of the three-way valve (8), the b port of the three-way valve (8) is connected to the water source heat exchanger (9), and the four-way reversing valve (16) is adjusted so that the discharge port of the compressor (13) is connected to the c port of the three-way valve (10). The refrigerant flows in the following order: compressor (13), four-way reversing valve (16), three-way valve (10), three-way valve c (11), three-way valve (8), water source heat exchanger (9), three-way valve (12), expansion valve 1 (17), flash evaporator (18), expansion valve 2 (19), TEC (21), air cooler (20), four-way reversing valve (16), and compressor (13).

6. The multi-energy complementary integrated energy system according to claim 1, characterized in that, In the case of insufficient light, the system uses a liquid storage tank (5) to pump cold fluid into a heat storage tank (4) via a circulation pump (6). The heat stored in the heat storage tank is then exchanged with the refrigerant in the water source heat exchanger (9) through the fluid for subsequent heat pump system circulation. Alternatively, the three-way valve (10) port a is connected to the air source heat exchanger (7), the three-way valve (8) port c is connected to the three-way valve (11) port b, and the three-way valve (11) port c is connected to the three-way valve (12) port b. The refrigerant circulates sequentially through the compressor (13), four-way reversing valve (16), three-way valve (10), air source heat exchanger (7), three-way valve (8), three-way valve (11), three-way valve (12), expansion valve 1 (17), flash evaporator (18), expansion valve 2 (19), TEC (21), air cooler (20), four-way reversing valve (16), and compressor (13).

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