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    题名: External recycle on upward-type double-pass solar air heaters
    作者: Yeh, Ho-ming
    贡献者: 淡江大學化學工程與材料工程學系
    关键词: Air heating;Double pass;Solar collector;Upward type
    日期: 2011-05
    上传时间: 2011-08-09 15:09:57 (UTC+8)
    出版者: Philadelphia: Taylor & Francis Group
    摘要: The external recycle effect on collector efficiency in an upward-type double-pass flat-plate solar air heater is investigated theoretically. Application of recycle to a solar air heater has two conflicting effects: the desirable effect of increasing the heat transfer coefficient and the undesirable effect of decreasing the heat transfer driving force (temperature difference). The theoretical predictions show that more than 150% improvement in collector efficiency is obtainable if external recycling is carried out in a way that the advantage effect compensates for the disadvantage effect. The collector performance improvement increases with increasing recycling ratio, especially when operating at a lower airflow rate with higher inlet air temperature. The collector efficiency obtained with a double-pass device with recycling improves the efficiency obtained with a single-pass device of the same size with recycling.
    關聯: Chemical Engineering Communications 198(5), pp.652-667
    DOI: 10.1080/00986445.2011.532734
    显示于类别:[化學工程與材料工程學系暨研究所] 期刊論文


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