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

Mallow, Anne; Abdelaziz, Omar; Graham, Jr., Samuel

doi:10.1016/j.carbon.2016.08.030

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

Journal Article · Fri Aug 12 00:00:00 EDT 2016 · Carbon

DOI:https://doi.org/10.1016/j.carbon.2016.08.030· OSTI ID:1324191

^[1]; Abdelaziz, Omar ^[2]; Graham, Jr., Samuel ^[1]

Georgia Inst. of Technology, Atlanta, GA (United States)
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)

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.

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Research Organization:: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States). Building Technologies Research and Integration Center (BTRIC)

Sponsoring Organization:: USDOE Office of Energy Efficiency and Renewable Energy (EERE), Energy Efficiency Office. Building Technologies Office

Grant/Contract Number:: AC05-00OR22725

OSTI ID:: 1324191

Alternate ID(s):: OSTI ID: 1396799

Journal Information:: Carbon, Vol. 109, Issue C; ISSN 0008-6223

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 28 works

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High-quality graphene aerogels for thermally conductive phase change composites with excellent shape stability Yang, Jing; Li, Xiaofeng; Han, Shuang Journal of Materials Chemistry A, Vol. 6, Issue 14 https://doi.org/10.1039/c8ta00078f	journal	January 2018
A thermal energy storage composite with sensing function and its thermal conductivity and thermal effusivity enhancement Lei, Hong; Fu, Chunfang; Zou, Yajun Journal of Materials Chemistry A, Vol. 7, Issue 12 https://doi.org/10.1039/c8ta11753e	journal	January 2019
High-Capacity High-Power Thermal Energy Storage Using Solid-Solid Martensitic Transformations Sharar, Darin J.; Leff, Asher C.; Wilson, Adam A. arXiv https://doi.org/10.48550/arxiv.2011.12339	preprint	January 2020

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