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Experimental investigations of porous materials in high temperature thermal energy storage systems

Authors
Journal
Solar Energy
0038-092X
Publisher
Elsevier
Publication Date
Volume
85
Issue
7
Identifiers
DOI: 10.1016/j.solener.2011.03.021
Keywords
  • Phase Change Materials
  • Sodium Nitrate (Nano3)
  • Metal Foam
  • Expanded Graphite

Abstract

Abstract In this paper, the feasibility of using porous materials such as metal foams and expanded graphite to enhance the heat transfer capability of PCMs in high temperature thermal energy storage system is experimentally investigated. Experimental results showed that the heat transfer rate can be enhanced through addition of the porous materials by 2.5 times compared to that of pure NaNO 3 in the heating process from 250–300 °C. However the heat transfer rate could be reduced by half in the liquid region since the natural convection can be severely suppressed by the porous structures. In an attempt to further reveal the natural convection effect in PCMs embedded in porous materials, two heating methods (boundary conditions) are examined. Finally the issue of corrosion process is briefly discussed.

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