The effect of collector aspect ratio and fin density on the thermal performance of rectangular finned absorber solar air heaters

The effect of collector aspect ratio on the thermal performance of solar air heater with plain fins on the absorber plate has been investigated theoretically. With constant collector area, the effect of various parameter such as air temperature rise, efficiency, collector efficiency factor, collector heat removal factor and fin density on aspect ratio have also been investigated. It is seen that either increasing the collector aspect ratio or increasing the fin density will improve the thermal performance.