期刊
ENERGY AND BUILDINGS
卷 231, 期 -, 页码 -出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.enbuild.2020.110615
关键词
Latent heat thermal energy storage; Thermal-conductivity enhancement; Shape stability; Sodium acetate trihydrate-potassium chloride-urea composite salt; Expanded graphite
资金
- National Key Research & Development Program of China [2018YFD1101005]
A novel composite phase-change material, SAT-KCl-urea/EG, was developed for energy-efficient heat pump latent heat thermal energy storage systems, demonstrating excellent thermal performance and phase-change properties.
To create an energy-efficient heat pump latent heat thermal energy storage (HPLHTES) system, a novel sodium acetate trihydrate (SAT)-potassium chloride (KCl)-urea/expanded graphite (EG) composite phase-change material (CPCM) was developed in this study. EG was introduced into the base composite salt to prepare the novel CPCM, SAT-KCl-urea/EG. The thermal properties, crystalline phase, and morphology of the resulting CPCM were experimentally characterized. It was found that the SAT-KCl-urea/EG CPCM comprising 9 wt% EG was optimal for affording improved thermal-energy storage performance without compromising phase-change properties. The obtained CPCM exhibits an appropriate melting point of 47.5 degrees C and a high phase-change enthalpy of 200.3 kJ/kg. The thermal conductivity of the SAT-KCl-urea/EG CPCM was 1.48 W/mK, approximately 5.3 times that of the SAT-KCI-urea composite salt (0.28 W/mK). The required phase-change duration of the SAT-KCl-urea/EG CPCM was approximately 30% less than that of the SAT-KCI-urea composite salt. After 100 thermal-cycle tests, the SATKCl-urea/9 wt% EG CPCM retained a desirable phase-change temperature of 45.9 degrees C, high latent heat of 190.8 kJ/kg, and an acceptable supercooling degree of 1.56 degrees C. These thermal feature results showed that the SAT-KCl-urea/9 wt% EG CPCM exhibited great potential for use in the HPLHTES systems. (C) 2020 Elsevier B.V. All rights reserved.
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