Energy Conversion Improvement Study of A Solar Chimney

• Main Authors: Chun-Hung Chen, 陳俊宏
• Other Authors: Shih-Hsiung Chen
• Format: Others
• Language: zh-TW
• Published: 2008
• Online Access: http://ndltd.ncl.edu.tw/handle/08568351758237130272

碩士 === 國立成功大學 === 航空太空工程學系碩博士班 === 96 === The purpose of this study is to investigate experimentally the internal flow temperature and flow pattern distribution inside a solar chimney. Factors that affect the chimney outlet velocity and hence improvements for better mass flow are discussed to increase the power generation efficiency of the solar chimney. Different geometries of the chimney tower and various means of solar thermal collection are tested to determine the influence on the flow rate. The study of flow entrance height , ranging from 1, 3, 5, and 10cm, suggests a clearance of 5 cm can be the best for available apparatus. The increase of the heat transfer area by installing fins upon the heating plate for different mass flow rate and internal temperature shows an increase in internal temperature but no significant effect in outlet velocity. A further study was to block the chimney heat loss with insulation. However, the experiment shows that the insulation bids no benefits in either temperature difference or the outlet velocity. For chimney tower geometry effect, the original acrylic chimney tower was replaced by divergent metal ones, bearing divergent angle of 2°, 6°, and 8°. The experimental results suggest significant increase in internal flow velocity in each case, while the best performance lays in the 6° case.