Please use this identifier to cite or link to this item: http://hdl.handle.net/11455/44814
標題: Performance of a serpentine heat exchanger: Part I - Effectiveness and heat transfer characteristics
作者: San, J.Y.
沈君洋
Lin, G.S.
Pai, K.L.
關鍵字: Serpentine heat exchanger
Effectiveness
Stanton number
Darcy friction
factor
pressure-drop
condensation
number
fin
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.
URI: http://hdl.handle.net/11455/44814
ISSN: 1359-4311
文章連結: http://dx.doi.org/10.1016/j.applthermaleng.2009.04.007
Appears in Collections:機械工程學系所

文件中的檔案:

取得全文請前往華藝線上圖書館



Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.