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    Please use this identifier to cite or link to this item: http://tkuir.lib.tku.edu.tw:8080/dspace/handle/987654321/55024


    Title: Downward-type solar air heaters with internal recycle
    Authors: Yeh, Ho-ming;Ho, Chii-dong
    Contributors: 淡江大學化學工程與材料工程學系
    Date: 2011-03-01
    Issue Date: 2011-08-09 15:08:52 (UTC+8)
    Publisher: Amsterdam: Elsevier BV
    Abstract: The effect of internal-recycle operation on the collector efficiency in flat-plate solar air heaters has been investigated theoretically. It is found that considerable improvement in collector efficiency is obtainable if the operation is carried out with an internal recycle, where the desirable effect of increasing fluid velocity to decrease the heat transfer resistance compensates for the undesirable effect of decreasing the driving force (temperature difference) of heat transfer, due to the remixing effect at the inlet by recycle operation. The enhancement increases with increasing reflux ratio, especially for operating at lower air flow rate, as well as with higher solar radiation incident and inlet air temperature. Further, the performance in a solar air heater operated with internal recycle overcomes that in the same-size device operated with external recycle.
    Relation: Journal of the Taiwan Institute of Chemical Engineers 42(2), pp.286-291
    DOI: 10.1016/j.jtice.2010.07.005
    Appears in Collections:[Graduate Institute & Department of Chemical and Materials Engineering] Journal Article

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