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標題: Performance of a serpentine heat exchanger: Part I - Effectiveness and heat transfer characteristics
作者: San, J.Y.
Lin, G.S.
Pai, K.L.
關鍵字: Serpentine heat exchanger
Stanton number
Darcy friction
期刊/報告no:: Applied Thermal Engineering, Volume 29, Issue 14-15, Page(s) 3081-3087.
摘要: This work deals with the heat transfer performance of a cross-flow serpentine heat exchanger for waste heat recovery. The heat exchanger is made of rectangular tubes which afford a narrow spacing for the flow outside the tubes (channel flow). In the analysis, the channel flow and the tube flow were considered as an unmixed flow and a mixed flow, respectively. The effectiveness of the heat exchanger (epsilon) was presented as a function of number of transfer units (Ntu), ratio of heat capacity rates (C(t)*) and number of rectangular tubes (N). For a set of C(t)* and N values, the epsilon value initially increases with the Ntu value. As the Ntu value is large, the epsilon value would slightly decrease with an increase of the Ntu value. The heat transfer and friction data on the channel-flow side of a small-scale prototype of the serpentine heat exchanger were measured. The heat exchanger is composed of 15 rectangular SUS-304 stainless-steel tubes. The channel-flow spacing is 1.4 mm. For the Reynolds number in the range 200-1188, the measured Darcy friction factors (f) and heat transfer data were successfully correlated as: f = 40.17Re(-0.876) and (St) over bar Pr(2/3) = 1.071Re(-0.682), respectively. (C) 2009 Elsevier Ltd. All rights reserved.
ISSN: 1359-4311
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