Development of highly conductive KNO3/NaNO3 composite for TES (thermal energy storage)

Y.J. Zhao, R.Z. Wang, L.W. Wang and N. Yu

Energy, 2014, vol. 70, issue C, 272-277

Abstract: PCM (phase change material) is one of the most popular media in TES (thermal energy storage) system for its high energy storage density and suitable melting temperature. However, its low heat transfer performance leads to low rate of heat stored and released. In this paper, a highly thermal conductive additive of ENG-TSA (expanded natural graphite treated with sulfuric acid) had been used to improve the thermal conductivity of the KNO3/NaNO3 nitrate mixture. Composite samples with different densities and mass fractions of ENG-TSA were produced by the cold-compression method. The thermal conductivities, phase transition properties, thermal stability and micro structures of different samples were evaluated, and results showed that the highest effective thermal conductivity of composite PCM was 50.78 W/(mK), which was 110 times higher than that of salt powder. The additive of ENG-TSA in the PCM caused a slight decrease in latent heat, but there was no remarkable variation in phase change temperature. The salt segregation from the consolidated composite PCM blocks could be controlled at a small value when the densities and mass fractions of ENG-TSA were optimized.

Keywords: PCM (phase change material); ENG (expanded natural graphite); Latent heat storage; Thermal properties (search for similar items in EconPapers)
Date: 2014
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (15)

Downloads: (external link)
http://www.sciencedirect.com/science/article/pii/S0360544214004083
Full text for ScienceDirect subscribers only

Related works:
This item may be available elsewhere in EconPapers: Search for items with the same title.

Export reference: BibTeX RIS (EndNote, ProCite, RefMan) HTML/Text

Persistent link: https://EconPapers.repec.org/RePEc:eee:energy:v:70:y:2014:i:c:p:272-277

DOI: 10.1016/j.energy.2014.03.127

Access Statistics for this article

Energy is currently edited by Henrik Lund and Mark J. Kaiser

More articles in Energy from Elsevier
Bibliographic data for series maintained by Catherine Liu ().