Numerical simulation and experiment on efficiency for the solar thermal energy due to falling dust

• Main Authors: Peng-Siang Hong, 洪鵬翔
• Other Authors: Jiann-Lin Chen
• Format: Others
• Language: zh-TW
• Published: 2016
• Online Access: http://ndltd.ncl.edu.tw/handle/37677811296130481244

碩士 === 義守大學 === 機械與自動化工程學系 === 104 === The solar radiation, which is the main energy source of the Earth, irradiates on earth and the solar energy becomes to the most important renewable energy. However it is easy to take, but not convenient to be used, and changed environments often influence the radiation energy. In Taiwan, the air pollution is serious, with relatively heavy falling dust existing. For this reason, this study used the solar simulator to provide the artificial daylight upon the falling-dust sample glass, thereafter the irradiance and temperature on the test plane were observed. We used the CFD technology to simulate the radiated thermal field by the light on and the radiant heat was reflected to the observation plane by reflector. Moreover, the diffuse fractions of the simulated glasses were adjusted to represent falling dust quantities for physical parametric analysis as compared with simulated and experimental results. In other aspect, based on the sample glass installed on the distiller, we applied solar energy on self-made distillers to measure the temperature and distilled water volume, also calculated their efficiencies. According to our experimental results, the irradiance decreased 51W/m2 and water efficiency decreased 50% if distilled by self-made distillers, after sample glasses exposed to outdoor environments in nine days.