Solar panels at 25 ℃ maximum efficiency of work, then it will decline with increasing temperature, the University of Kansas researchers to think about when the temperature is too high, how to extract the heat from the panel, in comparison After three kinds of roofing materials, they found that the panels installed on 'green roof' worked best, with an average increase of 1.4% conversion energy compared to white or black roofs.
Most of the solar panels are installed on the roof of the house and must experience the wind, sun and rain tests. Although they are sunshine, they suffer from the sun. When the panel temperature exceeds 25 ℃, the performance It will gradually decline, so that the manufacturing cost of solar panels popularization of the road challenged.
To solve this heat problem, two Ph.D. students from the University of Kansas School of Architecture and Design now find the best panels for their experiments.
They compare the three types of roofing materials most commonly laid by solar panels: a highly reflective white roof, the most traditional and common black roof, and a green roof planted with vegetation.The green roof is made up of a series of layers, from top to bottom Usually: vegetation, cover, matrix (growth medium), filter, drainage layer and waterproof membrane laid on the roof structure of the building.
Mohammed Alshayeb, one of the PhD students, installed solar panel monitoring systems, temperature / humidity / light sensors and even weather stations for wind speed on three roofs that record data every five minutes, Time is one year and Alshayeb analyzes it.
The solar industry's belief is that white roofs are the most friendly to solar panels because they reflect sunlight, but researchers have found that white roofs actually reflect heat to the solar panels rather than black roofs, which in turn leads to The panel efficiency is slightly reduced.
If compared to a green roof, then the slight difference between the black and white roofs is almost negligible because the solar panels installed on the green roof perform the best, with an average increase of 1.4% of the conversion energy.
However, Jae Chang, an associate professor of architecture and design at the University of Kansas, said the study is more comprehensive and the next step will be to test the effect of increasing the height of a solar panel on the roof .
