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RESEARCH PAPERS

The Second Law Quality of Energy Transformation in a Heat Exchanger

[+] Author and Article Information
D. P. Sekulic

Department of Mechanical Engineering and Materials Science, Duke University, Durham, NC 27706

J. Heat Transfer 112(2), 295-300 (May 01, 1990) (6 pages) doi:10.1115/1.2910375 History: Received December 12, 1988; Online May 23, 2008

Abstract

This paper presents the entropy generation (irreversibility) concept as a convenient method for estimating the quality of the heat exchange process in heat exchanger analysis. The entropy generation caused by finite temperature differences, scaled by the maximum possible entropy generation that can exist in an open system with two fluids, is used as the quantitative measure of the quality of energy transformation (the heat exchange process). This measure is applied to a two-fluid heat exchanger of arbitrary flow arrangement. The influence of different parameters (inlet temperature ratio, fluid flow heat capacity rate ratio, flow arrangements) and the heat exchanger thermal size (number of heat transfer units) on the quality of energy transformation for different types of heat exchangers is discussed. In this analysis it is assumed that the contribution of fluid friction to entropy generation is negligible.

Copyright © 1990 by The American Society of Mechanical Engineers
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