The Optimum Design of Improved Flat-Plate Solar Air Heaters

• Main Authors: Chi-Yen Lin, 林其諺
• Other Authors: Ho-Ming Yeh
• Format: Others
• Language: zh-TW
• Published: 1995
• Online Access: http://ndltd.ncl.edu.tw/handle/92150131281856006605

碩士 === 淡江大學 === 化學工程研究所 === 83 === The main applications of solar air heaters are drying and space heating. Many designs of solar air heaters have been i- nvestigated in improving the efficiency. There are many fact- ors influencing solar air heaters efficiency, such as the co- figation of absorber and the design of air duct. This study investigates the effects of aspect ratio of a rectangular flat- plate collector and area ratio of a divided collector on the collector efficiency, under constant collec- tor area and constant flow rate. Five collector types were considered in this study. They are the collectors (a)with fl- ow over absorber, (b)with downward fin, (c)with upward fin, (d)with downward fin attached by baffles, and (e)with upward fin attached by baffles. In first section, the results indicated that the collect- or efficiency increases when collector aspect ratio increases . In second section, it was found that the efficiency is imp- roved when the collector is divided into two component and t- he optimum area ratio is unity.