skip to main content
DOE PAGES title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: Thermal charging study of compressed expanded natural graphite/phase change material composites

Abstract

The thermal charging performance of paraffin wax combined with compressed expanded natural graphite foam was studied for different graphite bulk densities. Constant heat fluxes between 0.39 W/cm2 and 1.55 W/cm2 were applied, as well as a constant boundary temperature of 60 °C. Thermal charging experiments indicate that, in the design of thermal batteries, thermal conductivity of the composite alone is an insufficient metric to determine the influence of the graphite foam on the thermal energy storage. By dividing the latent heat of the composite by the time to end of melt for each applied boundary condition, the energy storage performance was calculated to show the effects of composite thermal conductivity, graphite bulk density, and latent heat capacity. For the experimental volume, the addition of graphite beyond a graphite bulk density of 100 kg/m3 showed limited benefit on the energy storage performance due to the decrease in latent heat storage capacity. These experimental results are used to validate a numerical model to predict the time to melt and for future use in the design of heat exchangers with graphite-foam based phase change material composites. As a result, size scale effects are explored parametrically with the validated model.

Authors:
ORCiD logo [1];  [2];  [1]
  1. Georgia Inst. of Technology, Atlanta, GA (United States)
  2. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Publication Date:
Research Org.:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Building Technologies Research and Integration Center (BTRIC)
Sponsoring Org.:
USDOE Office of Energy Efficiency and Renewable Energy (EERE), Energy Efficiency Office. Building Technologies Office
OSTI Identifier:
1324191
Alternate Identifier(s):
OSTI ID: 1396799
Grant/Contract Number:  
AC05-00OR22725
Resource Type:
Accepted Manuscript
Journal Name:
Carbon
Additional Journal Information:
Journal Volume: 109; Journal Issue: C; Journal ID: ISSN 0008-6223
Publisher:
Elsevier
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE

Citation Formats

Mallow, Anne, Abdelaziz, Omar, and Graham, Jr., Samuel. Thermal charging study of compressed expanded natural graphite/phase change material composites. United States: N. p., 2016. Web. https://doi.org/10.1016/j.carbon.2016.08.030.
Mallow, Anne, Abdelaziz, Omar, & Graham, Jr., Samuel. Thermal charging study of compressed expanded natural graphite/phase change material composites. United States. https://doi.org/10.1016/j.carbon.2016.08.030
Mallow, Anne, Abdelaziz, Omar, and Graham, Jr., Samuel. Fri . "Thermal charging study of compressed expanded natural graphite/phase change material composites". United States. https://doi.org/10.1016/j.carbon.2016.08.030. https://www.osti.gov/servlets/purl/1324191.
@article{osti_1324191,
title = {Thermal charging study of compressed expanded natural graphite/phase change material composites},
author = {Mallow, Anne and Abdelaziz, Omar and Graham, Jr., Samuel},
abstractNote = {The thermal charging performance of paraffin wax combined with compressed expanded natural graphite foam was studied for different graphite bulk densities. Constant heat fluxes between 0.39 W/cm2 and 1.55 W/cm2 were applied, as well as a constant boundary temperature of 60 °C. Thermal charging experiments indicate that, in the design of thermal batteries, thermal conductivity of the composite alone is an insufficient metric to determine the influence of the graphite foam on the thermal energy storage. By dividing the latent heat of the composite by the time to end of melt for each applied boundary condition, the energy storage performance was calculated to show the effects of composite thermal conductivity, graphite bulk density, and latent heat capacity. For the experimental volume, the addition of graphite beyond a graphite bulk density of 100 kg/m3 showed limited benefit on the energy storage performance due to the decrease in latent heat storage capacity. These experimental results are used to validate a numerical model to predict the time to melt and for future use in the design of heat exchangers with graphite-foam based phase change material composites. As a result, size scale effects are explored parametrically with the validated model.},
doi = {10.1016/j.carbon.2016.08.030},
journal = {Carbon},
number = C,
volume = 109,
place = {United States},
year = {2016},
month = {8}
}

Journal Article:

Citation Metrics:
Cited by: 4 works
Citation information provided by
Web of Science

Save / Share:

Works referenced in this record:

Paraffin/porous-graphite-matrix composite as a high and constant power thermal storage material
journal, July 2001

  • Py, Xavier; Olives, Régis; Mauran, Sylvain
  • International Journal of Heat and Mass Transfer, Vol. 44, Issue 14
  • DOI: 10.1016/S0017-9310(00)00309-4

Curbing global warming with phase change materials for energy storage
journal, February 2013


Review on thermal transport in high porosity cellular metal foams with open cells
journal, June 2012


Performance enhancement in latent heat thermal storage system: A review
journal, December 2009

  • Jegadheeswaran, S.; Pohekar, Sanjay D.
  • Renewable and Sustainable Energy Reviews, Vol. 13, Issue 9, p. 2225-2244
  • DOI: 10.1016/j.rser.2009.06.024

Phase Change Heat Transfer Enhancement Using Copper Porous Foam
journal, May 2008

  • Siahpush, Ali; O’Brien, James; Crepeau, John
  • Journal of Heat Transfer, Vol. 130, Issue 8
  • DOI: 10.1115/1.2928010

Carbon foam matrices saturated with PCM for thermal protection purposes
journal, August 2006


Thermal conductivity enhancement of phase change materials using a graphite matrix
journal, October 2006


Preparation and thermal characterization of expanded graphite/paraffin composite phase change material
journal, August 2010


An in situ small angle neutron scattering study of expanded graphite under a uniaxial stress
journal, June 2013


High performance storage composite for the enhancement of solar domestic hot water systems
journal, May 2011


High performance storage composite for the enhancement of solar domestic hot water systems
journal, January 2012


Heat transfer enhancement of paraffin wax using compressed expanded natural graphite for thermal energy storage
journal, January 2010


A review on phase-change materials: Mathematical modeling and simulations
journal, January 2011

  • Dutil, Yvan; Rousse, Daniel R.; Salah, Nizar Ben
  • Renewable and Sustainable Energy Reviews, Vol. 15, Issue 1
  • DOI: 10.1016/j.rser.2010.06.011

A work procedure of utilising PCMs as thermal storage systems based on air-TES systems
journal, January 2014


Numerical and experimental investigation of melting and freezing processes in phase change material storage
journal, March 2004


    Works referencing / citing this record:

    High-quality graphene aerogels for thermally conductive phase change composites with excellent shape stability
    journal, January 2018

    • Yang, Jing; Li, Xiaofeng; Han, Shuang
    • Journal of Materials Chemistry A, Vol. 6, Issue 14
    • DOI: 10.1039/c8ta00078f

    A thermal energy storage composite with sensing function and its thermal conductivity and thermal effusivity enhancement
    journal, January 2019

    • Lei, Hong; Fu, Chunfang; Zou, Yajun
    • Journal of Materials Chemistry A, Vol. 7, Issue 12
    • DOI: 10.1039/c8ta11753e