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RESEARCH PAPERS

Heat Transfer Enhancement in a Paraffin Wax Thermal Storage System

[+] Author and Article Information
J. Eftekhar, A. Haji-Sheikh, D. Y. S. Lou

Department of Mechanical Engineering, University of Texas at Arlington, Arlington, Texas 76019

J. Sol. Energy Eng 106(3), 299-306 (Aug 01, 1984) (8 pages) doi:10.1115/1.3267599 History: Received April 01, 1983; Online November 11, 2009

Abstract

Heat transfer enhancement in a thermal storage system consisting of vertically arranged fins between a heated and cooled horizontal finned-tube arrangement is reported. The high thermal expansion coefficient and low viscosity of paraffin wax, at temperatures above 50°C, are utilized to induce natural convection in the liquid phase even at small thicknesses. The experimental data on the rate of production of liquid as a function of time and temperature of the hot surface is presented. The photographs of the melted zone indicate a naturally buoyant flow induced in the neighborhood of the vertical fins causes a rapid melting of the solid wax and a downdraft along the cooler solid phase surface. The heat transfer coefficient at the interface is calculated from experimentally determined instantaneous locations of the moving boundary.

Copyright © 1984 by ASME
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