Automatic water-cooled photovoltaic system

Abstract

The invention discloses an automatic water-cooled photovoltaic system. The automatic water-cooled photovoltaic system comprises a first photovoltaic panel, a waste heat recovery system and an automatic power on-off system. The first photovoltaic panel comprises a light-transmitting structure, a lower photovoltaic panel body and an aluminum frame, wherein a hollow layer is arranged between the lower photovoltaic panel body and the light-transmitting structure. The waste heat recovery system comprises a first water pipe, a normally closed solenoid valve, a second water pipe, a normally open solenoid valve and a water storage tank. The automatic power on-off system comprises a second photovoltaic panel arranged on the aluminum frame, a power supply device arranged on one side of the first photovoltaic panel and a power on-off structure, wherein the power on-off structure is used for communicating when the generating power of the second photovoltaic panel is greater than a preset generating power, and is further used for being disconnected when the generating power of the second photovoltaic panel is less than or equal to the preset generating power. The automatic water-cooled photovoltaic system is simple in structure, and the waste heat recovery effect and power generation efficiency of photovoltaic modules can be improved at the same time.

Description

technical field [0001] The invention relates to the fields of photovoltaic and photothermal, in particular to an automatic water-cooled photovoltaic system. Background technique [0002] Under standard conditions, the photoelectric conversion rate of photovoltaic modules is 8% to 17%, and more than 70% of 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. [0003] In order to reduce the temperature of photovoltaic modules and improve their power generation efficiency, the existing technology adopts a waste heat recovery system (water cooling system or air cooling system) on the back of photovoltaic modules to reduce the temperature on the back of photovoltaic modules. Although this method ca...

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Problems solved by technology

In fact, the temperature of the front side of the photovoltaic module is much higher than that of the back side during power generation. Reducing the temperature of the front side of the photovoltaic panel has a greater effect on improving the power generation efficiency of the photovoltaic module. In order not to affect the power generation of the front side of the photovoltaic panel, the existing technology can only reduce the heat on the back side of the photovoltaic module. Reduce the temperature of photovoltaic modules, so that the operating energy consumption of photovoltaic modules is higher and the heat recovery effect is poor when recovering waste heat from photovoltaic modules

[0004] In the case of the same solar radiation intensity, the power generation efficiency of photovoltaic modules is not only related to temperature, but also related to the angle of sunlight. The more vertical the sunlight is to the surface of photovoltaic modules, the higher the power generation efficiency and power. In order to fully Using sunlight, the existing technology mostly adopts the angle adjustment structure to adjust the angle of the photovoltaic module to improve the power generation efficiency and power generation function of the photovoltaic module. Although the application effect of this technology is good, the application cost and maintenance cost are relatively high

[0005] In addition, since the temperature of photovoltaic panels varies under different weather conditions, in order to effectively recover the heat of photovoltaic panels in the existing technology, temperature monitoring systems and control devices are often installed during use. Although these devices can better control waste heat recovery The system recycles the heat of photovoltaic panels, but the application cost is very high in distributed photovoltaic projects. 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, a The total investment of ordinary 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 the technology to automatically improve the power generation efficiency and power generation of photovoltaic modules at low cost without affecting the power generation of photovoltaic modules.

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