| Summary: | 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.
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