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RESEARCH PAPERS

Thermodynamic Analysis of Latent Heat Storage in a Shell-and-Tube Heat Exchanger

[+] Author and Article Information
Ch. Charach, A. Zemel

Center for Energy and Environmental Physics, J. Blaustein Institute for Desert Research, Ben Gurion University of the Negev, Sede-Boqer Campus 84990, Israel

J. Sol. Energy Eng 114(2), 93-99 (May 01, 1992) (7 pages) doi:10.1115/1.2929995 History: Received April 04, 1991; Revised October 18, 1991; Online June 06, 2008

Abstract

This work addresses the entropy generation aspects of a latent heat storage in which the energy delivered by a hot gas flowing through a cylindrical tube induces melting of the material surrounding the tube. The heat transfer for conduction-dominated melting is analyzed, taking into account the two-dimensional effects. The storage process irreversibilities associated with both the gas flow and the heat transfer (including entropy generation in the melted layer) are considered. The number of entropy generation units, which is a measure of the thermodynamic imperfection of the energy storage process, is expressed as a function of the main design parameters of the system. Analytic bounds and simplified asymptotic expressions for this quantity are derived. The results are compared with earlier one-dimensional studies.

Copyright © 1992 by The American Society of Mechanical Engineers
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