Efficient power-generating building photovoltaic system

Abstract

The invention discloses an efficient power-generating building photovoltaic system. The system comprises a photovoltaic panel arranged on a roof in an inclined manner, a dripping device, a water power-on / off structure, an electromagnetic valve and an automatic power-on / off system; the water power-on / off structure is arranged at a contact part of a right side of a lower insulating frame and an upper surface of a photovoltaic panel body; the automatic power-on / off system comprises a thermoelectric power generation system, a power supply device, a first power-on / off structure and a second power-on / off structure; the thermoelectric power generation system comprises a first thermoelectric power generation structure and a second thermoelectric power generation structure which are respectively arranged on a power connecting line of the power supply device and the electromagnetic valve; the water power-on-off structure is arranged on a wire connecting line of the second thermoelectric power generation structure and the second power-on / off structure, and the second thermoelectric power generation structure is in wire connection with the second power-on / off structure. The system disclosed bythe invention is simple in structure, and the application cost and the running energy consumption for cooling by the building photovoltaic system can be greatly reduced.

Description

technical field [0001] The invention relates to the field of building photovoltaics, in particular to a building photovoltaic system for high-efficiency power generation. Background technique [0002] The photoelectric conversion rate of photovoltaic modules is 8% to 17% under standard conditions, and more than 70% of the solar energy is not used, and the temperature of photovoltaic modules has a great impact on its power generation efficiency. As the temperature of the module itself increases, its power generation decreases. For example, for crystalline silicon solar cells, the output power decreases by 0.4% to 0.6% for every 1 °C increase in temperature. Therefore, reducing the working stability is very important to improve the power generation efficiency of photovoltaic modules. On the other hand, photovoltaic modules are outdoors all year round, and a lot of dust will accumulate on the surface, which will reduce the power generation efficiency of photovoltaic modules. ...

AI Technical Summary

Problems solved by technology

[0004] At present, although the surface water cooling technology of photovoltaic modules can significantly reduce the temperature of photovoltaic panels, the application cost and operating energy consumption of this technology are high, and it cannot be applied in many occasions. A drip device needs to be installed, and a recovery device for recycling cleaning water needs to be installed at the lower part, and the water pump needs to continuously transport the water in the recovery device to the drip device on the top of the photovoltaic panel during operation

In addition, since the water on the surface of the photovoltaic panel has been circulating, the heat absorption effect of this part in a short period of time is average, resulting in high energy consumption for the operation of the water pump

According to relevant information, the total cost of installing an ordinary rural rooftop photovoltaic project is more than 20,000 yuan, and its estimated annual power generation is 4,000 degrees. Assuming that the photovoltaic panel cooling technology can increase the power generation by 5%, it can generate 200 degrees more electricity , based on the current daytime electricity price of 0.6 yuan / kWh, about 120 yuan of economic benefits will be generated. Considering the application cost and the energy consumption of water pump operation, the photovoltaic cooling technology with too high cost will be difficult to be really applied

[0005] In addition, since the temperature of photovoltaic panels varies under different weather conditions, in order to effectively reduce the temperature of photovoltaic panels in the existing technology, temperature monitoring systems and control devices are often installed during use. Although these devices can better control the cooling system Reduce the temperature of photovoltaic panels, but the application cost in distributed photovoltaic projects is very high, and a single solar pyranometer costs thousands, and because it is installed outdoors, it is prone to failure after long-term use, and maintenance is more troublesome. For example, an ordinary The total investment of rural rooftop photovoltaic projects is more than 20,000 yuan. If monitoring systems and control devices are added, the investment costs will increase significantly

[0006] At present, the existing technology still lacks surface water cooling technology that can automatically improve the power generation efficiency and power generation of building photovoltaic systems with low cost and low energy consumption.

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