Photovoltaic and photo-thermal dual-source heat pump water heating system

Abstract

The utility model belongs to new energy technology field, concretely is a kind of photovoltaic photo-thermal dual-source heat pump hot water system, including PV / T photovoltaic photo-thermal plate, PV / T hot water storage tank, dual-source heat pump unit, hot water tank and PV / T source side circulating water pump, the water outlet of PV / T photovoltaic photo-thermal plate and the water inlet of PV / T hot water storage tank are connected by PV / T heat exchange water pump, the water inlet of PV / T photovoltaic photo-thermal plate is connected with the water outlet of PV / T hot water storage tank, the water outlet of PV / T hot water storage tank and the water inlet of dual-source heat pump unit are connected by PV / T source side circulating water pump, the water outlet of dual-source heat pump unit and the water inlet of hot water tank are connected by hot water circulating water pump.The utility model system combines multiple energy-saving technologies, integrates hot water production and photovoltaic power generation functions into an integrated device, improving the utilization rate of the device. This device has intelligent control, allowing users to control according to their needs, has high degree of intelligence and is easy to operate.

Description

Technical Field

[0001] This utility model relates to the field of new energy technology, and in particular to a dual-source heat pump hot water system based on photovoltaic and solar thermal energy. Background Technology

[0002] Currently, buildings require significant amounts of energy for heating, air conditioning, lighting, and electricity use, with cooling and heating consuming the largest share. As global emphasis on environmental protection and sustainable development grows, the application of renewable energy in the building sector will become increasingly widespread. Global environmental issues have made reducing buildings' energy demands a crucial topic. By adopting energy-saving technologies, promoting sustainable building materials, and developing renewable energy, we can reduce building energy consumption and environmental impact, thus promoting sustainable energy development.

[0003] Currently, the application of solar low-temperature hot water systems and solar photovoltaic power generation systems has developed rapidly. In some regions, the economic benefits and energy-saving effects of domestic solar hot water systems have already become apparent. While stand-alone and grid-connected photovoltaic power generation systems are technically relatively mature...

[0004] However, current photovoltaic and solar thermal systems are susceptible to instability due to climate change and day-night cycles, which can affect daily life. Furthermore, high temperatures in photovoltaic and solar thermal systems can lead to a decrease in photoelectric conversion efficiency. On the other hand, air source heat pumps also suffer from performance degradation due to a drop in ambient temperature. Utility Model Content

[0005] The purpose of this invention is to solve the problem mentioned in the background art that the current photovoltaic and solar thermal systems are unstable due to climate change and day-night cycles, which affects daily life. Therefore, this invention proposes a dual-source heat pump system for photovoltaic and solar thermal water heating.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] A photovoltaic-thermal dual-source heat pump hot water system includes a PV / T photovoltaic thermal panel, a PV / T hot water storage tank, a dual-source heat pump unit, a hot water tank, and a PV / T source-side circulating water pump. The outlet end of the PV / T photovoltaic thermal panel is connected to the inlet end of the PV / T hot water storage tank via a PV / T hot water exchange pump. The inlet end of the PV / T photovoltaic thermal panel is connected to the outlet end of the PV / T hot water storage tank. The outlet end of the PV / T hot water storage tank is connected to the inlet end of the dual-source heat pump unit via a PV / T source-side circulating water pump. The outlet end of the dual-source heat pump unit is connected to the inlet end of the hot water tank via a hot water circulating water pump.

[0008] Preferably, the PV / T photovoltaic thermal panel and the PV / T hot water exchange pump are connected to the PV / T hot water storage tank via a third electric valve and a fourth electric valve.

[0009] Preferably, the PV / T photovoltaic thermal panel and the PV / T hot water pump are connected to the hot water tank via a first electric valve and a second electric valve.

[0010] Preferably, a partition is provided in the middle of the hot water tank to divide the hot water tank into a preheating water tank and a constant temperature water tank, and the preheating water tank has a built-in spiral heat exchange tube.

[0011] Preferably, the PV / T hot water storage tank, the preheating water tank, and the constant temperature water tank are all equipped with temperature sensors.

[0012] Preferably, the dual-source heat pump unit uses a PV / T plate hot water storage tank and an air source as heat sources, and switches between the two sources according to their respective temperatures.

[0013] Compared with the prior art, the present invention has the following beneficial effects:

[0014] This invention utilizes solar energy to generate electricity. The electricity generated by the solar photovoltaic thermal system can be used to power the system or the daily needs of users, reducing the system's reliance on traditional grid electricity and reducing the amount of coal combustion required for thermal power generation, thus significantly reducing environmental pollution. The photovoltaic thermal panels are cooled by a cold PV. / T heat exchange circulation pump, thereby reducing the temperature of the photovoltaic thermal panels and improving the efficiency of photovoltaic power generation. The main unit can produce hot water to meet the hot water and heating needs of users.

[0015] This invention detects the temperature of the photovoltaic thermal panel and uses a backplate heat exchanger to monitor it, preventing excessively high temperatures from causing a decrease in photoelectric conversion efficiency. Simultaneously, the heat from the photovoltaic thermal water is used to heat the user's hot water tank. Compared to existing systems that rely solely on air heat sources for hot water heating, this avoids the performance degradation of air source heat pumps caused by temperature drops due to climate change and day-night cycles. This operating method ensures optimal power generation efficiency while storing excess energy for user-side heating, resulting in more stable system operation and significant energy savings.

[0016] This utility model system combines multiple energy-saving technologies, integrating hot water production and photovoltaic power generation into a single device, thereby improving the utilization rate of the equipment. This device features intelligent centralized control, allowing users to control it according to their needs. It has a high degree of intelligence and is easy to operate. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of a photovoltaic and photothermal dual-source heat pump hot water system proposed in this utility model.

[0018] In the diagram: 1 PV / T photovoltaic thermal panel, 2 PV / T hot water storage tank, 3 PV / T hot water exchange pump, 4 PV / T source-side circulating water pump, 5 dual-source heat pump water heater, 6 hot water circulating water pump, 7 hot water tank, 8 cold water supply pipe, 9 hot water return pipe, 10 hot water delivery pump, 11 spiral heat exchanger tube, 12 electric valve, 13 electric valve, 14 electric valve, 15 electric valve. Detailed Implementation

[0019] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0020] Reference Figure 1 A photovoltaic and solar thermal dual-source heat pump hot water system includes a PV / T photovoltaic solar thermal panel 1, a PV / T hot water storage tank 2, a dual-source heat pump unit 5, a hot water tank 7, and a PV / T source-side circulating water pump 4. The water outlet of the PV / T photovoltaic solar thermal panel 1 is connected to the water inlet of the PV / T hot water storage tank 2 through a PV / T hot water exchange pump 3.

[0021] In this embodiment, the PV / T photovoltaic thermal panel 1 and the PV / T hot water pump 3 are connected to the PV / T hot water storage tank 2 via a third electric valve 14 and a fourth electric valve 15. The inlet end of the PV / T photovoltaic thermal panel 1 is connected to the outlet end of the PV / T hot water storage tank 2.

[0022] In this embodiment, the PV / T photovoltaic thermal panel 1 and the PV / T hot water pump 3 are connected to the hot water tank 2 through the first electric valve 12 and the second electric valve 13. The outlet of the PV / T hot water storage tank 2 is connected to the inlet of the dual-source heat pump unit 5 through the PV / T source-side circulating water pump 4. The dual-source heat pump unit 5 uses the PV / T panel hot water storage tank and the air source as heat sources, and the heat source is switched according to the temperature of the two sources.

[0023] In this embodiment, the outlet of the dual-source heat pump unit 5 is connected to the inlet of the hot water tank 7 through a hot water circulation pump 6. A partition is installed in the middle of the hot water tank 7 to divide the hot water tank 7 into a preheating water tank and a constant temperature water tank. The preheating water tank has a built-in spiral heat exchange tube. Temperature sensors are installed inside the PV / T hot water storage tank 2, the preheating water tank and the constant temperature water tank.

[0024] In this embodiment, in the hot water production mode of the photovoltaic-thermal dual-source heat pump system, electric valves 14 and 15 are opened, and electric valves 12 and 13 are closed. The PV / T photovoltaic thermal panel stores the heat from the back plate of the PV / T photovoltaic thermal panel in the PV / T hot water storage tank through the PV / T hot water exchange pump.

[0025] In this embodiment, when the temperature of the PV / T hot water storage tank reaches the set value, the electric valves 14 and 15 are closed and the electric valves 12 and 13 are opened. The PV / T hot water pump stores the heat from the back plate of the PV / T photovoltaic thermal panel in the hot water tank (7) preheating tank.

[0026] In this embodiment, the dual-source heat pump water heater unit 5 starts producing hot water by first activating the PV / T source-side circulating water pump 4 and the hot water circulating water pump 6 to heat the constant-temperature water tank 7 to the target value of 55°C. If the heat from the PV / T storage tank 2 is insufficient, the dual-source heat pump water heater unit 5 directly switches to air-source mode to produce hot water.

[0027] In this embodiment, the constant temperature water tank of hot water tank 7 is delivered to the user end by hot water delivery pump 10. When the water level of the constant temperature water tank of hot water tank 7 is lower than the set value, water is replenished to the constant temperature water tank of hot water tank 7 through the preheating water tank of hot water tank 7.

[0028] In this embodiment, in power generation mode, the system can use the electricity generated by the solar photovoltaic and solar thermal system to power the system operation or the daily needs of users by turning on the inverter and bidirectional meter.

[0029] In this embodiment, solar power generation is utilized. The electricity generated by the solar photovoltaic thermal system can power the system or the daily needs of users, reducing the system's reliance on traditional grid electricity and the need for coal combustion in thermal power generation, thus significantly reducing environmental pollution. A cold PV / T heat exchange circulation pump cools the photovoltaic thermal panels, thereby lowering their temperature and improving photovoltaic power generation efficiency. The main unit can then produce hot water to meet the hot water and heating needs of users.

[0030] In this embodiment, the temperature of the photovoltaic thermal panel is detected and controlled using a backplate heat exchanger to prevent excessively high temperatures from causing a decrease in photoelectric conversion efficiency. Simultaneously, the heat from the photovoltaic thermal water is used to heat the user's hot water tank. Compared to existing methods that rely solely on air heat sources for hot water heating, this solution avoids the performance degradation of air-source heat pumps caused by temperature drops due to climate change and day-night cycles. This application's operating method ensures optimal power generation efficiency while storing excess energy for user-side heating, resulting in more stable system operation and significant energy savings.

[0031] In this embodiment, the system combines multiple energy-saving technologies, integrating hot water production and photovoltaic power generation into a single unit, thus improving equipment utilization. This equipment features intelligent centralized control, allowing users to control it according to their needs; it boasts a high degree of intelligence and is easy to operate.

[0032] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. A photovoltaic-thermal dual-source heat pump hot water system, comprising a PV / T photovoltaic thermal panel (1), a PV / T hot water storage tank (2), a dual-source heat pump unit (5), a hot water tank (7), and a PV / T source-side circulating water pump (4), characterized in that: The outlet of the PV / T photovoltaic thermal plate (1) is connected to the inlet of the PV / T hot water storage tank (2) via a PV / T hot water exchange pump (3). The inlet of the PV / T photovoltaic thermal plate (1) is connected to the outlet of the PV / T hot water storage tank (2). The outlet of the PV / T hot water storage tank (2) is connected to the inlet of the dual-source heat pump unit (5) via a PV / T source-side circulating water pump (4). The outlet of the dual-source heat pump unit (5) is connected to the inlet of the hot water tank (7) via a hot water circulating water pump (6).

2. The photovoltaic-thermal dual-source heat pump hot water system according to claim 1, characterized in that: The PV / T photovoltaic thermal panel (1) and the PV / T hot water pump (3) are connected to the PV / T hot water storage tank (2) through a third electric valve (14) and a fourth electric valve (15).

3. The photovoltaic-thermal dual-source heat pump hot water system according to claim 1, characterized in that: The PV / T photovoltaic thermal panel (1) and the PV / T hot water pump (3) are connected to the hot water tank (2) through the first electric valve (12) and the second electric valve (13).

4. A photovoltaic-thermal dual-source heat pump hot water system according to claim 1, characterized in that: The hot water tank (7) is divided into a preheating water tank and a constant temperature water tank by a partition in the middle. The preheating water tank has a built-in spiral heat exchange tube.

5. A photovoltaic-thermal dual-source heat pump hot water system according to claim 4, characterized in that: Temperature sensors are installed inside the PV / T hot water storage tank (2), the preheating water tank, and the constant temperature water tank.

6. A photovoltaic-thermal dual-source heat pump hot water system according to claim 1, characterized in that: The dual-source heat pump unit (5) uses a PV / T plate hot water storage tank and an air source as heat sources, and switches between the two sources according to their temperature.

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