Incorporation of Phase-Change Materials Into a Ground Thermal Energy Storage System: Theoretical Study

[+] Author and Article Information
Y. Rabin, E. Korin

Department of Chemical Engineering, Ben-Gurion University of the Negev, P. O. Box 653, Beer-Sheva 84105, Israel

J. Energy Resour. Technol 118(3), 237-241 (Sep 01, 1996) (5 pages) doi:10.1115/1.2793868 History: Received September 15, 1995; Revised April 18, 1996; Online December 05, 2007


An investigation of a ground thermal energy storage system, which includes storage units containing phase-change materials (PCM), is presented. This study is related to a large-diameter helical heat exchanger, which is placed vertically in the ground. The PCM storage units under consideration have a cylindrical shell shape and are located inside and/or outside the helix. A modified numerical scheme for the Solution of heat transfer in the ground, in the PCM units, and within the heat exchanger pipe, is presented. The theoretical results show that the thermal diffusivity of the PCM dominates the thermal performance of the system. Incorporation of PCM storage units containing paraffin wax results in a reduction of the thermal efficiency in comparison with a system not containing these units. However, incorporation of PCM having the same thermal diffusivity as of the soil results in a significant improvement of the thermal performance.

Copyright © 1996 by The American Society of Mechanical Engineers
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