Improvement on Device Performance in Multi-Pass Heat Transfer through a Parallel-Plate Channel with External Recycle

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Title:	Improvement on Device Performance in Multi-Pass Heat Transfer through a Parallel-Plate Channel with External Recycle
Authors:	何啟東;Ho, Chii-dong;Tsai, Yu-chuan;Tu, Jr-wei
Contributors:	淡江大學化學工程與材料工程學系
Keywords:	Heat exchangers;Conjugated Graetz problems;Multi-pass operations;External recycle
Date:	2007-11-01
Issue Date:	2010-08-09 18:19:40 (UTC+8)
Publisher:	Elsevier
Abstract:	A new external-recycle device of multi-pass heat exchangers with uniform wall temperature, resulting in a considerable heat-transfer efficiency improvement, has been designed and studied theoretically. The theoretical analysis on the temperature profile and heat-transfer efficiency improvement has been developed by using an eigenfunction expansion in power series. The analytical predictions are represented graphically and compared with that in single-pass devices and the previous work [C.D. Ho, H.M. Yeh, Y.C. Tsai, Improvement in performance of multi-pass laminar counterflow heat exchangers with external refluxes, Int. J. Heat Mass Transfer 45 (2002) 3529–3547]. A substantial heat-transfer efficiency improvement is obtained by employing such a new recycle type with a suitable adjustment of the impermeable-sheet position and recycle ratio, instead of using the single-pass device without external recycle for Gz>10 and the recycle type of the previous study for Gz>30.
Relation:	International Journal of Heat and Mass Transfer 50(23-24), pp.4805-4811
Appears in Collections:	[Graduate Institute & Department of Chemical and Materials Engineering] Journal Article

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