Title: Airside performance of fin-and-tube heat exchangers in dehumidifying conditions - Data with larger diameter
Authors: Liu, Young-Chang
Wongwises, Somchai
Chang, Wen-Jeng
Wang, Chi-Chuan
機械工程學系
Department of Mechanical Engineering
Keywords: Fin-and-tube heat exchanger;Plain fin;Dehumidification
Issue Date: 1-Mar-2010
Abstract: This study presents the airside performance of the fin-and-tube heat exchangers having plain fin geometry with a larger diameter tube (D(c) = 15.88 mm) under dehumidifying condition. A total of nine samples of heat exchangers subject to change of the number of tube row and fin pitch are made and tested. It is found that the effect of fin pitch on the sensible j factor is, in general, diminished with the rise of tube row. However, there is a unique characteristic of fin pitch at a shallow tube row, the heat transfer performance is first increased at a wider pitch but a further increase of fin pitch lead to a falloff of heat transfer performance due to interactions amid flow development and bypass flow. The influence of tube row on the airside performance is rather small for both heat transfer and frictional characteristics at a fin pitch of 2.1 mm and when the Reynolds number is less than 4000. A slight deviation of this effect is encountered when fin pitch is increased to 2.54 mm or 3.1 mm due to condensate adhered phenomena. (C) 2009 Elsevier Ltd. All rights reserved.
URI: http://dx.doi.org/10.1016/j.ijheatmasstransfer.2009.12.015
http://hdl.handle.net/11536/5760
ISSN: 0017-9310
DOI: 10.1016/j.ijheatmasstransfer.2009.12.015
Journal: INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
Volume: 53
Issue: 7-8
Begin Page: 1603
End Page: 1608
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