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The effect of collector aspect ratio on the collector efficiency of baffled solar air heaters has been investigated theoretically. With constant collector area, the collector efficiency increases when the collector aspect ratio increases. This is the same results as those obtained in the previous work for flat-plate solar air heaters without fins and baffles. Although the collector efficiency of...
The collector efficiencies of solar air heaters can be improved by operating several subcollectors in series in place of a single collector with the same total area. The improvement increases with increasing insolation and a decrease in flow rate or collector aspect ratio. The subcollector area for maximum efficiency is unity.
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