Preparation and performance of modified expanded graphite/eutectic salt composite phase change cold storage material

•The K2HPO4·3H2ONaH2PO4·2H2ONa2S2O3·5H2OH2O eutectic salt has large latent heat.•Na2B4O7·10H2O can effectively reduce the supercooling degree of the eutectic salt.•The adsorption capacity of modified expanded graphite reaches up to 80.71 wt%.•Modified expanded graphite enhances the thermal conductiv...

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Bibliographic Details
Published in:International journal of refrigeration 2020-02, Vol.110, p.178-186
Main Authors: Xie, Ning, Li, Zhongping, Gao, Xuenong, Fang, Yutang, Zhang, Zhengguo
Format: Article
Language:English
Subjects:
Adsorption
Air conditioners
Air conditioning
Cold energy storage
Cold storage
Composite PCM
Cooling
Energy storage
Eutectic salt
Eutectic temperature
Graphite
Graphite expansé modifié
Latent heat
Logistics
Modified expanded graphite
PCM composite
Phase change materials
Phase transitions
Potassium phosphates
Refrigeration
Salt
Sel eutectique
Sodium phosphate
Sodium thiosulfate
Stockage d’énergie froide
Supercooling
Supply chains
Thermal conductivity
Thermodynamic properties
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Summary:•The K2HPO4·3H2ONaH2PO4·2H2ONa2S2O3·5H2OH2O eutectic salt has large latent heat.•Na2B4O7·10H2O can effectively reduce the supercooling degree of the eutectic salt.•The adsorption capacity of modified expanded graphite reaches up to 80.71 wt%.•Modified expanded graphite enhances the thermal conductivity of eutectic salt. Cold energy storage technologies using phase change materials (PCM) have received increasing attention these years. In this work, we develop a novel kind of composite PCM using modified expanded graphite (MEG) to adsorb K2HPO4·3H2O–NaH2PO4·2H2O–Na2S2O3·5H2O–H2O eutectic salt by impregnation method. Within 120 min, the adsorption capacity of MEG for eutectic salt is 75.33% higher than that of unmodified expanded graphite (EG). The composite PCM has a phase change temperature of −5.30 °C, a large latent heat of 161.8 kJ kg−1, and a low supercooling degree of 1.83 °C. The thermal conductivity of the composite PCM is 13.3 times as large as that of the eutectic salt. Moreover, the thermal cycle tests demonstrated excellent thermal reliability. These outstanding thermal properties endow K2HPO4·3H2O–NaH2PO4·2H2O–Na2S2O3·5H2O–H2O eutectic salt/MEG composite PCM with broad application prospects in the fields of beer industry, air conditioning refrigeration, refrigerator refrigeration and cold chain logistics.
ISSN:0140-7007
1879-2081
DOI:10.1016/j.ijrefrig.2019.10.008