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    題名: Solar air heaters with external recycle
    作者: Yeh, Ho-Ming;Ho, Chii-Dong
    貢獻者: 淡江大學化學工程與材料工程學系
    關鍵詞: Solar air heater;Collector efficiency;External recycle
    日期: 2009-06
    上傳時間: 2011-10-21 16:34:02 (UTC+8)
    出版者: Kidlington: Pergamon
    摘要: The effect of external recycle on the collector efficiency in solar air heaters has been investigated theoretically. The application of external-recycle operation to solar air heaters actually has two conflict effects. One is the desirable effect of increasing fluid velocity to decrease the heat transfer resistance. The other is the undesirable effect of decreasing the driving force (temperature difference) of heat transfer, due to the remixing at the inlet. 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 overcomes the undesirable effect. The enhancement increases with increasing reflux ratio, especially for operating at lower air flow rate with higher inlet air temperature.
    關聯: Applied Thermal Engineering 29(8–9), pp.1694–1701
    DOI: 10.1016/j.applthermaleng.2008.07.027
    顯示於類別:[化學工程與材料工程學系暨研究所] 期刊論文

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