[China Glass Network] 38 ° C, 38 ° C ... continuous high temperature, constantly refreshing the high temperature record of Ningbo since this summer. What the Ningbo citizens are talking about is where to go to the cold, is to go to the library? go to the museum? Or the water world? For the villagers in Zhangjia Village, Datun Town, Fenghua City, it seems that this summer is still cooler than in previous years. What is the matter?
Installing photovoltaic panels on the roof
The temperature of the weather forecast shows that Fenghua has been ranked second in the country's high temperature in recent days, and the temperature is not lower than in previous years. Then why do the residents of Fenghua Zhangjiacun say that they were not hot this year?
From the structure of Zhangjiacun's buildings, there are more than 100 households in Zhangjiacun, and the 15 buildings in the village building are the most striking. This three-story house, the first floor is the kitchen, the living room, and the second and third floors are accommodation. On the third floor is a cement prefabricated board with half stacks of debris, which is the tile on the fourth floor. The villager Zhang Donghong lived in the room on the third floor all the year round. He told reporters that in the summer of last year, the third floor was particularly hot. When he slept at night, he was too hot to sleep on the ground, or could not stop sweating. This summer is also strange, although the outside temperature exceeds 38 ° C, but not so hot at night to sleep, do not need to open the air conditioner, you can sleep in bed.
“After the summer, the sun is shining, this half is a 'steamer', and the room that directly affects the third floor will be very hot. But this year we are installing photovoltaic panels on the roof of the house in Zhangjiacun. These days, workers They are braving the heat to install a solar photovoltaic power station on the roof. The direct effect is that the third floor is not so hot.†​​Zhang Dingfei, director of the Zhangjiacun Village Committee, told reporters that because the photovoltaic panels are placed on the front half of the roof, the fourth floor The temperature between the first half and the second half is very different, and the first half is cool. Zhang Dingfei said that in fact, the installation of solar energy on the roof also has 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 the roof. Added a thick curtain.
PV power plant will be officially operated in September
"The roof 'cover' on the photovoltaic panel, for the cooling is more obvious, the photovoltaic panel can absorb 80% of the light heat, and this part of the heat is collected on the photovoltaic panel, through the heat to the underlying tiles, and It is not the direct sunlight shining on the tiles. In addition, the heat is radiated upwards, which makes the heat transferred to the roof more limited.†The staff responsible for the installation of the solar photovoltaic power station in Zhangjiacun told reporters that once the solar photovoltaic power station generates electricity, the photovoltaic About 20% of the heat energy on the board is directly converted into electric energy, and the heat energy that can be transferred to the roof will be less, and the effect of cooling down on a high temperature day will be better.
“The roof is covered with a layer of photovoltaic panels, and the roof tiles are also protected from the wind and rain. It also has a certain effect on the protection of the roof.†The staff added that cooling, “protecting†the roof is just photovoltaic The "side effects" of the panel, the real role of photovoltaic panels is to generate electricity and convert solar energy into electricity.
It is understood that after the photovoltaic panels are installed on the roof of most houses in Zhangjiacun, the photovoltaic project will be officially launched. At that time, Zhangjiacun can issue 250,000 kWh of electricity a year, and the villagers use only 100,000 kWh of electricity a year. . Villagers can use electricity for free, and the excess will be converted into economic income in the village. Zhang Decun instructor Feng Delin, who introduced the solar power project, said that in September, the solar photovoltaic power station will be officially opened. By then, the village appearance of Zhangjiacun will be completely new.
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