Effects of Expanded Graphite Compound of Different Sizes on Thermal Properties of NaNO3–NaCl/Expanded Graphite

Effects of Expanded Graphite Compound of Different Sizes on Thermal Properties of NaNO3–NaCl/Expanded Graphite

The rational use of energy is of great significance for the long-term stable development of the economy. However, energy such as solar energy and industrial waste heat are difficult to be utilized stably. The development of thermal storage technology can alleviate the instability of energy. In this...

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Bibliographic Details
Published in:International journal of thermophysics Vol. 45; no. 1
Main Authors: Li, Yan, Ma, Kunqiang, Jiang, Sile, Zhu, Qunzhi
Format: Journal Article
Language:English
Published: New York Springer US 2024
Springer Nature B.V
Subjects:
Classical Mechanics
Condensed Matter Physics
Conduction heating
Conductive heat transfer
Energy consumption
Geophysics
Graphite
Heat storage
Industrial Chemistry/Chemical Engineering
Industrial wastes
Latent heat
Particle size
Phase change materials
Physical Chemistry
Physics
Physics and Astronomy
Solar energy
Supercooling
Technical services
Thermal conductivity
Thermal storage
Thermodynamic properties
Thermodynamics
Expanded graphite
Latent heat
Thermal conductivity
Expanded graphite powder
Phase change heat storage
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Summary:The rational use of energy is of great significance for the long-term stable development of the economy. However, energy such as solar energy and industrial waste heat are difficult to be utilized stably. The development of thermal storage technology can alleviate the instability of energy. In this paper, 96 wt% NaNO 3 -4 wt% NaCl (NN) was used as the thermal storage material and expanded graphite (EG) was used to adsorb NN binary phase change material (PCM). The effect of EG with different particle sizes on the thermal performance of NaNO 3 –NaCl/EG composite phase change material (CPCM) was studied. The results showed that the addition of EG reduced the supercooling degree of NN from 4.7 °C to 1.1 °C. The addition of EG powder increased the contact probability between fillers and provided more adsorption positions for PCM, increasing the latent heat of composites. The addition of 32 mesh EG–EG powder greatly increased the thermal conductivity of NN from 1.24 W·m −1 ·K −1 to 5.43 W·m −1 ·K −1 . It is because the pores of large particle size EG are filled with EG powder, which is easy to form chain or network structure, forming more heat conduction pathways. The research provides some technical support for the application of phase change heat storage technology.
ISSN:0195-928X
1572-9567
DOI:10.1007/s10765-023-03306-y