Title: Two non-dimensional exergy transfer performance parameters of heat exchanger

Authors: Shuang-Ying Wu, Xiao-Feng Yuan, You-Rong Li

Addresses: College of Power Engineering, Chongqing University, Chongqing 400044, PR China. ' College of Power Engineering, Chongqing University, Chongqing 400044, PR China. ' College of Power Engineering, Chongqing University, Chongqing 400044, PR China

Abstract: A new non-dimensional performance parameter, exergy transfer units number, which is in conjunction with exergy transfer effectiveness, is proposed to evaluate exergy transfer performance of heat exchangers operating above/below the surrounding temperature. The analytical expressions of exergy transfer units number are derived, and the relationship between exergy transfer effectiveness and exergy/heat transfer units number is further established. The impacts of heat transfer units number, the ratio of heat capacity of cold fluids to that of hot fluids and flow patterns on exergy transfer units number, as well as the dependence of exergy transfer units number on exergy transfer effectiveness, are systematically discussed.

Keywords: heat exchangers; exergy transfer units number; exergy transfer effectiveness; heat transfer; performance evaluation.

DOI: 10.1504/IJEX.2010.029619

International Journal of Exergy, 2010 Vol.7 No.1, pp.130 - 145

Published online: 30 Nov 2009 *

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