標題: On the heat transfer correlation for membrane distillation
作者: Wang, Chi-Chuan
機械工程學系
Department of Mechanical Engineering
關鍵字: Membrane distillation;Heat transfer coefficient;Wilson plot
公開日期: 1-Apr-2011
摘要: The present study examines the heat transfer coefficients applicable for membrane distillation. In the available literatures, researchers often adopt some existing correlations and claim the suitability of these correlations to their test data or models. Unfortunately this approach is quite limited and questionable. This is subject to the influences of boundary conditions, geometrical configurations, entry flow conditions, as well as some influences from spacer or support. The simple way is to obtain the heat transfer coefficients from experimentation. However there is no direct experimental data for heat transfer coefficients being reported directly from the measurements. The main reasons are from the uncertainty of permeate side and of the comparatively large magnitude of membrane resistance. Additional minor influence is the effect of mass transfer on the heat transfer performance. In practice, the mass transfer effect is negligible provided the feed side temperature is low. To increase the accuracy of the measured feed side heat transfer coefficient, it is proposed in this study to exploit a modified Wilson plot technique. Through this approach, one can eliminate the uncertainty from permeate side and reduce the uncertainty in membrane to obtain a more reliable heat transfer coefficients at feed side from the experimentation. (C) 2010 Elsevier Ltd. All rights reserved.
URI: http://dx.doi.org/10.1016/j.enconman.2010.11.014
http://hdl.handle.net/11536/9083
ISSN: 0196-8904
DOI: 10.1016/j.enconman.2010.11.014
期刊: ENERGY CONVERSION AND MANAGEMENT
Volume: 52
Issue: 4
起始頁: 1968
結束頁: 1973
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