While the concept of minimum irreversibility is associated with the maximum energy efficiency for energy conversion processes in thermal systems, we have found that it is not quite applicable to the heat exchanger analysis. We have shown that the heat exchanger effectiveness can be maximum, having an intermediate value or minimum at the maximum irreversibility operating point depending on the flow arrangement of the two fluids. Similarly, the heat exchanger effectiveness can be minimum or maximum at the minimum irreversibility operating point. The objective of this paper is to illustrate and discuss such heat exchanger performance and irreversibility trends by combining the temperature difference irreversibility with the results for complex flow arrangements.
Entropy Generation Extrema and Their Relationship With Heat Exchanger Effectiveness—Number of Transfer Unit Behavior for Complex Flow Arrangements
This paper was presented at the Fifth ISHMT/ASME Heat and Mass Transfer Conference in Calcutta, India, and published in Heat and Mass Transfer 2002, Proc. 5th ISHMT-ASME Heat Mass Transfer Conf., Tata McGraw-Hill Pub. Co. Ltd., New Delhi, India, pp. 910–919, 2002. Reprinted with permission. ©2002, Tata McGraw-Hill Publishing Company, Ltd., 7 West Patel Nagar, New Delhi 110008, India.. Manuscript received by the Heat Transfer Division November 27, 2002; revision received August 28, 2003. Associate Editor: M. K. Jensen.
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Shah, R. K., and Skiepko, T. (January 26, 2005). "Entropy Generation Extrema and Their Relationship With Heat Exchanger Effectiveness—Number of Transfer Unit Behavior for Complex Flow Arrangements ." ASME. J. Heat Transfer. December 2004; 126(6): 994–1002. https://doi.org/10.1115/1.1846694
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