Have you heard that photovoltaic power plants are installed on the roof, which not only cools down the temperature, but also provides free electricity.
It's summer, and the average temperature in some areas is 35°C. However, after the installation of photovoltaic power station systems, in the hottest weather, the temperature of the top room will drop by about 6°C. The use of photovoltaic power plants not only saves the electricity purchased from the grid, but also saves the energy consumption of the air conditioner by cooling, achieving the effect of double energy saving!
Let’s first look at the experiment of a set of photovoltaic power plants
Recently, someone braved the heat to make a series of measured data.
Under the high temperature of 35℃, at 12 noon, the roof temperature is as high as 68.5℃.
1) Surface temperature of photovoltaic modules
Because the photovoltaic modules in the photovoltaic power station convert solar energy into electricity, the surface temperature of the photovoltaic modules is only 57.5℃, which is 11℃ lower than the roof temperature.
2) Surface temperature of the back panel of the photovoltaic group
Photovoltaic power plants generate heat when they convert solar energy into electrical energy; at the same time, because they are installed on the roof and the backplane is poorly ventilated, the temperature of the backplane of the module will be higher than the surface temperature of the module, reaching 63℃. But it is still 5.5°C lower than the roof temperature.
3) The temperature of the roof under the photovoltaic module
Under the photovoltaic module, the temperature of the roof without direct sunlight is 48℃, which is 20.5℃ lower than that of the unshielded roof!
It can be seen that photovoltaic modules use solar energy to reduce the heating of the top roof, thereby indirectly lowering the temperature in the top room.
Don't believe it? Let's take a look at this again!
The secretary of the committee said: “In the summer, when the sun is shining, the house is a'steamer', but this year we are installing photovoltaic power plants on the roof of our house. The direct effect is that the roof is not as hot as it is. The installation of photovoltaic power stations also has a thermal insulation effect on the building, especially in the case of high temperature in summer and low temperature in winter, the cooling effect on the two-story house is more obvious, which is equivalent to adding a thick layer on the roof Curtains.'
The engineer said: 'The photovoltaic power station is'covered' on the roof, which is more obvious for cooling. The photovoltaic power station can absorb 80% of the light heat, and this part of the heat is concentrated on the photovoltaic power station and is transmitted through the heat transfer channel. On the tiles below, instead of the sunlight directly shining on the tiles. In addition, the heat energy is dissipated upwards, which makes the heat conduction to the roof more limited. Once the solar photovoltaic power station generates power, the thermal energy of the photovoltaic panel is 20% The left and right are directly converted into electric energy, and the heat energy that can be transferred to the roof will be less, and the cooling effect will be better in high temperature days.'
'A layer of photovoltaic power station is ‘covered’ on the roof, which also prevents the roof tiles from being exposed to wind, rain and sun. It also has a certain effect on the protection of the roof.'
It is understood that after photovoltaic power stations are installed on the roofs of most of the houses in the village, the photovoltaic power station project will be officially launched. At that time, the village can generate 250,000 kilowatt-hours of electricity a year, while the total electricity consumption of the villagers in a year is only 100,000 degrees. Villagers can use electricity for free, and the excess will be converted into the village's economic income.
Rooftop photovoltaic is a new type of power source with broad prospects, with three major advantages of permanence, cleanliness and flexibility. Due to its own environmental protection and energy saving features and external state subsidy policy support, it deserves to be a trend in rural cities. Hope that you with a roof will not miss this trend.