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TECHNICAL BRIEFS

Thermodynamics of Phase-Change Storage in Series With a Heat Engine

[+] Author and Article Information
C. Charach

Center for Energy and Environmental Physics, J. Blaustein Institute for Desert Research, Ben Gurion University of the Negev, Sede Boqer Campus, 44990, Israel

M. Conti

Dipartimento di Mathematica e Fisica, Universita di Camerino, Camerino 62032, Italy

C. Bellecci

Dipartimento di Fisica, Universita della Calabria, Rende 87030, Italy

J. Sol. Energy Eng 117(4), 336-341 (Nov 01, 1995) (6 pages) doi:10.1115/1.2847888 History: Received July 01, 1994; Revised March 01, 1995; Online February 14, 2008

Abstract

This paper addresses thermodynamics of phase-change storage elements in series with heat engines. It is assumed that the duration of the heat storage and the discharge are equal. It is also assumed that the same heat transfer fluid (HTF) with a constant flow rate is used for the whole cycle. The major constraint imposed on these systems is the stability of the temperature of the HTF supplied to the engine during the storage-discharge cycle. It is shown, for this setup, that the freezing point of the phase-change material (PCM) is defined by the First Law. Maximal stability corresponds to the freezing point equal to the arithmetic mean of the inlet temperatures of the hot and the cold streams. An analytic expression is developed for the Second Law efficiency of the heat storage-removal cycle for the phase-change element in series with an engine. It yields maximal entropy production in the absolute stability limit. Two analytically tractable models of a phase-change storage in series with a heat engine are studied in detail. One involves a PCM slab, and the second involves a PCM tube-and-shell heat exchanger.

Copyright © 1995 by The American Society of Mechanical Engineers
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