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Title: Development of graphite foam infiltrated with MgCl 2 for a latent heat based thermal energy storage (LHTES) system

Abstract

Thermal energy storage (TES) systems that are compatible with high temperature power cycles for concentrating solar power (CSP) require high temperature media for transporting and storing thermal energy. To that end, TES systems have been proposed based on the latent heat of fusion of the phase change materials (PCMs). However, PCMs have relatively low thermal conductivities. In this paper, use of high-thermal-conductivity graphite foam infiltrated with a PCM (MgCl2) has been investigated as a potential TES system. Graphite foams with two porosities were infiltrated with MgCl2. The infiltrated composites were evaluated for density, heat of fusion, melting/freezing temperatures, and thermal diffusivities. Estimated thermal conductivities of MgCl2/graphite foam composites were significantly higher than those of MgCl2 alone over the measured temperature range. Furthermore, heat of fusion, melting/freezing temperatures, and densities showed comparable values to those of pure MgCl2. Results of this study indicate that MgCl2/graphite foam composites show promise as storage media for a latent heat thermal energy storage system for CSP applications.

Authors:
; ; ; ;
Publication Date:
Research Org.:
Argonne National Lab. (ANL), Argonne, IL (United States)
Sponsoring Org.:
USDOE Office of Energy Efficiency and Renewable Energy (EERE) - Office of Solar Energy Technology (SETO) - SunShot Initiative
OSTI Identifier:
1391670
DOE Contract Number:
AC02-06CH11357
Resource Type:
Journal Article
Resource Relation:
Journal Name: Renewable Energy; Journal Volume: 94; Journal Issue: C
Country of Publication:
United States
Language:
English
Subject:
25 ENERGY STORAGE; 36 MATERIALS SCIENCE; concentrated solar power; infiltration; latent thermal energy storage; phase change material

Citation Formats

Singh, Dileep, Kim, Taeil, Zhao, Weihuan, Yu, Wenhua, and France, David M. Development of graphite foam infiltrated with MgCl 2 for a latent heat based thermal energy storage (LHTES) system. United States: N. p., 2016. Web. doi:10.1016/j.renene.2016.03.090.
Singh, Dileep, Kim, Taeil, Zhao, Weihuan, Yu, Wenhua, & France, David M. Development of graphite foam infiltrated with MgCl 2 for a latent heat based thermal energy storage (LHTES) system. United States. doi:10.1016/j.renene.2016.03.090.
Singh, Dileep, Kim, Taeil, Zhao, Weihuan, Yu, Wenhua, and France, David M. Mon . "Development of graphite foam infiltrated with MgCl 2 for a latent heat based thermal energy storage (LHTES) system". United States. doi:10.1016/j.renene.2016.03.090.
@article{osti_1391670,
title = {Development of graphite foam infiltrated with MgCl 2 for a latent heat based thermal energy storage (LHTES) system},
author = {Singh, Dileep and Kim, Taeil and Zhao, Weihuan and Yu, Wenhua and France, David M.},
abstractNote = {Thermal energy storage (TES) systems that are compatible with high temperature power cycles for concentrating solar power (CSP) require high temperature media for transporting and storing thermal energy. To that end, TES systems have been proposed based on the latent heat of fusion of the phase change materials (PCMs). However, PCMs have relatively low thermal conductivities. In this paper, use of high-thermal-conductivity graphite foam infiltrated with a PCM (MgCl2) has been investigated as a potential TES system. Graphite foams with two porosities were infiltrated with MgCl2. The infiltrated composites were evaluated for density, heat of fusion, melting/freezing temperatures, and thermal diffusivities. Estimated thermal conductivities of MgCl2/graphite foam composites were significantly higher than those of MgCl2 alone over the measured temperature range. Furthermore, heat of fusion, melting/freezing temperatures, and densities showed comparable values to those of pure MgCl2. Results of this study indicate that MgCl2/graphite foam composites show promise as storage media for a latent heat thermal energy storage system for CSP applications.},
doi = {10.1016/j.renene.2016.03.090},
journal = {Renewable Energy},
number = C,
volume = 94,
place = {United States},
year = {Mon Aug 01 00:00:00 EDT 2016},
month = {Mon Aug 01 00:00:00 EDT 2016}
}