THERMAL SCIENCE

International Scientific Journal

Gui Xiaohong

,

Li Tie

,

Liang Shiqiang

,

Yuan Dazhong

,

Tang Dawei

INFLUENCE OF VOID RATIO ON PHASE CHANGE OF THERMAL ENERGY STORAGE FOR HEAT PIPE RECEIVER

ABSTRACT
In this paper, influence of void ratio on phase change of thermal storage unit for heat pipe receiver under microgravity is numerically simulated. Accordingly, mathematical model is set up. A solidification-melting model upon the enthalpy-porosity method is specially provided to deal with phase changes. The liquid fraction distribution of thermal storage unit of heat pipe receiver is shown. The fluctuation of melting ratio in PCM canister is indicated. Numerical results are compared with experimental ones in Japan. The results show that void cavity prevents the process of phase change greatly. PCM melts slowly during sunlight periods and freezes slowly during eclipse periods as void ratio increases. The utility ratio of PCM during both sunlight periods and eclipse periods decreases obviously with the improvement of void ratio. The thermal resistance of void cavity is much higher than that of PCM canister wall. Void cavity prevents the heat transfer between PCM zone and canister wall.
KEYWORDS
void ratio, phase change, thermal energy storage, heat pipe receiver
PAPER SUBMITTED: 2013-06-27
PAPER REVISED: 2013-07-31
PAPER ACCEPTED: 2013-09-08
PUBLISHED ONLINE: 2013-09-22
DOI REFERENCE: https://doi.org/10.2298/TSCI130627135X
CITATION EXPORT: view in browser or download as text file
THERMAL SCIENCE YEAR 2015, VOLUME 19, ISSUE Issue 3, PAGES [967 - 976]
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Influence of void ratio on phase change of thermal energy storage for heat pipe receiver

© 2024 Society of Thermal Engineers of Serbia. Published by the Vinča Institute of Nuclear Sciences, National Institute of the Republic of Serbia, Belgrade, Serbia. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution-NonCommercial-NoDerivs 4.0 International licence