Thermodynamics of Energy Storage by Melting Due to Conduction or Natural Convection

[+] Author and Article Information
M. De Lucia, A. Bejan

Department of Mechanical Engineering and Materials Science, Duke University, Durham, NC 27706

J. Sol. Energy Eng 112(2), 110-116 (May 01, 1990) (7 pages) doi:10.1115/1.2929642 History: Accepted December 04, 1989; Received December 04, 1989; Online June 06, 2008


This paper describes the most basic thermodynamic aspects of the process of energy storage by melting of a phase change material when the energy source is a stream of hot single-phase fluid. The first part of the paper considers the melting process ruled by pure conduction across the liquid phase, and the second part deals with the quasi-steady melting dominated by natural convection. The paper establishes the relationship between the total irreversibility of the melting process and design parameters such as the number of heat transfer units of the heat exchanger placed between the energy source and the phase change material, the duration of the melting process, and the position of the energy storage process on the absolute temperature scale. It is shown that the exergy transfer to the melting material is maximized when the melting temperature (Tm ) equals the geometric average of the environment temperature (Te ) and the temperature of the energy source (T∞ ) , in other words when Tm =(Te T∞ )1/2 . This conclusion holds for both conduction-dominated melting and convection-dominated melting.

Copyright © 1990 by The American Society of Mechanical Engineers
Your Session has timed out. Please sign back in to continue.





Some tools below are only available to our subscribers or users with an online account.

Related Content

Customize your page view by dragging and repositioning the boxes below.

Related Journal Articles
Related eBook Content
Topic Collections

Sorry! You do not have access to this content. For assistance or to subscribe, please contact us:

  • TELEPHONE: 1-800-843-2763 (Toll-free in the USA)
  • EMAIL: asmedigitalcollection@asme.org
Sign In