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    Please use this identifier to cite or link to this item: http://tkuir.lib.tku.edu.tw:8080/dspace/handle/987654321/60344


    Title: Effect of external recycle on upward-type solar air heaters
    Authors: Yeh, Ho-Ming;Ho, Chii-Dong
    Contributors: 淡江大學化學工程與材料工程學系
    Keywords: Collector;Heat transfer;Heating;Efficiency;Simulation
    Date: 2010-01-01
    Issue Date: 2011-10-13 22:28:07 (UTC+8)
    Publisher: Amsterdam: Elsevier BV
    Abstract: The external recycle effect on the collector efficiency in upward-type flat-plate solar air heaters is theoretically investigated. External-recycling application to solar air heaters has two conflicting effects due to the forced heat convection strength resulting in considerable device heat transfer performance improvement. The first effect is the advantage of decreasing the heat transfer resistance due to increasing fluid velocity. The second disadvantage effect is the remixing at the inlet which decreases the heat transfer transfer-driving force decrement (temperature difference). The theoretical predictions show that considerable improvement in collector efficiency is obtainable if the operation is carried out with external recycling in which the advantage effect overcomes the disadvantage effect. Device performance enhancement increases with increasing recycling ratio, especially when operating at a lower air flow rate with higher inlet air temperature.
    Relation: Journal of the Taiwan Institute of Chemical Engineers 41(1), pp.92–95
    DOI: 10.1016/j.jtice.2009.04.009
    Appears in Collections:[化學工程與材料工程學系暨研究所] 期刊論文

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