Collector Efficiency in Downward-Type Double-Pass Solar Air Heaters with Attached Fins and Operated by External Recycle

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Title:	Collector Efficiency in Downward-Type Double-Pass Solar Air Heaters with Attached Fins and Operated by 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;downward type;double pass;external recycle;fins
Date:	2012-06-04
Issue Date:	2012-09-26 11:20:54 (UTC+8)
Publisher:	Basel: M D P I AG
Abstract:	The collector efficiency in a downward-type double-pass external-recycle solar air heater with fins attached on the absorbing plate has been investigated theoretically. Considerable improvement in collector efficiency is obtainable if the collector is equipped with fins and the operation is carried out with an external recycle. Due to the recycling, the desirable effect of increasing the heat transfer coefficient compensates for the undesirable effect of decreasing the driving force (temperature difference) of heat transfer, while the attached fins provide an enlarged heat transfer area. The order of performances in the devices of same size is: double pass with recycle and fins > double pass with recycle but without fins > single pass without recycle and fins.
Relation:	Energies 5(8), pp.2692-2707
DOI:	10.3390/en5082692
Appears in Collections:	[Graduate Institute & Department of Chemical and Materials Engineering] Journal Article

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