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    Please use this identifier to cite or link to this item: http://tkuir.lib.tku.edu.tw:8080/dspace/handle/987654321/58177

    Title: Heat-transfer enhancement of double-pass solar air heaters with external recycle
    Authors: Yeh, Ho-ming;Ho, Chii-dong
    Contributors: 淡江大學化學工程與材料工程學系
    Keywords: Solar air heater;Collector efficiency;Double-pass operation;External recycle
    Date: 2011-09-01
    Issue Date: 2011-09-30 09:30:13 (UTC+8)
    Publisher: Amsterdam: Elsevier BV
    Abstract: The effects of double-pass and external-recycle operations on the collector efficiency in solar air heaters have been investigated theoretically. It is found that considerable improvement in collector efficiency is obtainable if the operation is carried out with an external 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 at the inlet by recycle operation. The enhancement increases with increasing reflux ratio, especially for operating at lower air flow rate. Moreover, performance of double-pass solar air heater with recycling device is better in comparison to single-pass solar air heater of the same size.
    Relation: Journal of the Taiwan Institute of Chemical Engineers 42(5), pp.793-800
    DOI: 10.1016/j.jtice.2011.02.010
    Appears in Collections:[Graduate Institute & Department of Chemical and Materials Engineering] Journal Article

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