Heat utilization system for rooftop photovoltaic power stations

Abstract

The invention relates to a heat utilization system for rooftop photovoltaic power stations, and belongs to the field of photovoltaic power generation and waste heat utilization. The system comprises a photovoltaic power generation assembly, wherein the back surface of the photovoltaic power generation assembly is provided with a heat collector; the heat collector is provided with a circulating waterway of a No.1 heat exchange sheet connected to the inside of a water-tank heat exchanger; the circulating waterway is provided with a water pump; the water-tank heat exchanger is provided with an automatic water filling valve and an automatic water drain valve; the circulating waterway is provided with a No.1 temperature sensor; a No.2 temperature sensor is arranged in the water-tank heat exchanger; the No.1 temperature sensor and the No.2 temperature sensor are in signal connection with a controller; and the controller controls the opening and closing of the water pump, the automatic water filling valve and the automatic water drain valve. The system is simple in structure and low in cost, and especially applicable to remote areas or roof photovoltaic power stations, and can effectively guarantee the photovoltaic power generation efficiency and provides domestic water, and therefore, the system has popularization and application values.

Description

technical field [0001] The invention relates to a photovoltaic power generation system, in particular to a heat utilization system of a rooftop photovoltaic power station, which belongs to the field of waste heat utilization of photovoltaic power generation. Background technique [0002] Photovoltaic power generation is one of the ways of large-scale utilization of clean energy in the future. In addition to large-scale ground power station power generation in China, the construction and development of rooftop power stations are regarded as the main installation place for photovoltaic power generation in relatively developed areas, especially photovoltaic building integration. The transformation can significantly improve the utilization efficiency of solar energy for buildings, reduce the consumption of fossil energy and the emission of greenhouse gases. Currently, the most suitable photovoltaic cells for building integrated photovoltaics are amorphous silicon thin-film solar ...

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Problems solved by technology

[0002] Photovoltaic power generation is one of the ways of large-scale utilization of clean energy in the future. In addition to large-scale ground power station power generation in China, the construction and development of rooftop power stations are regarded as the main installation place for photovoltaic power generation in relatively developed areas, especially photovoltaic building integration. The transformation can significantly improve the utilization efficiency of solar energy for buildings, reduce the consumption of fossil energy and the emission of greenhouse gases. Currently, the most suitable photovoltaic cells for building integrated photovoltaics are amorphous silicon thin-film solar cells. This type of battery converts electricity The efficiency is below 13%, and more than 80% of the solar energy is wasted as other forms of energy. Even at present, the conversion efficiency of the large-scale power station crystalline silicon cells that can be used on the roof is below 20%, and most of the solar energy is consumed by other forms of energy. Most of the wasted energy is converted into heat energy. This part of heat energy is not only unusable, but also accumulates on the solar cell, causing the temperature of the photovoltaic module to rise. Because the best working temperature of the solar cell is generally 25 degrees Celsius Left and right, the rise in temperature will lead to a decrease in the power generation efficiency of solar cell components, leading to an increase in the cost of power generation of the system. At the same time, this repeated temperature rise and fall will also have a certain negative impact on the life of solar cell components. The cost of photovoltaic power generation is increased. If the rooftop power station is built in a remote area, the use of heat energy will be more practical to improve the lives of residents. Therefore, the use of heat energy conversion and utilization devices to make photovoltaic modules work in a certain temperature range can not only ensure photovoltaic power generation. The power generation efficiency of the modules can also improve the comprehensive utilization rate of solar energy

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