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Thermal conductivity enhancement of a sodium acetate trihydrate–potassium chloride–urea/expanded graphite composite phase–change material for latent heat thermal energy storage
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Highlights An EG-based SAT-KCl-urea composite with improved thermal properties was prepared. The thermal conductivity of the resulting novel CPCM was enhanced to 1.48 W/m·K. The CPCM exhibited a desirable melting point of 47.5 °C and better shape stability. The phase-change period of the novel CPCM was 30% less than that of SAT-KCl-urea. The novel SAT-KCl-urea/EG CPCM showed great potential for latent energy storage.
Abstract 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 °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/m·K, approximately 5.3 times that of the SAT–KCl–urea composite salt (0.28 W/m·K). The required phase–change duration of the SAT–KCl–urea/EG CPCM was approximately 30% less than that of the SAT–KCl–urea composite salt. After 100 thermal–cycle tests, the SAT–KCl–urea/9 wt% EG CPCM retained a desirable phase–change temperature of 45.9 °C, high latent heat of 190.8 kJ/kg, and an acceptable supercooling degree of 1.56 °C. These thermal feature results showed that the SAT–KCl–urea/9 wt% EG CPCM exhibited great potential for use in the HPLHTES systems.
Thermal conductivity enhancement of a sodium acetate trihydrate–potassium chloride–urea/expanded graphite composite phase–change material for latent heat thermal energy storage
Graphical abstract Display Omitted
Highlights An EG-based SAT-KCl-urea composite with improved thermal properties was prepared. The thermal conductivity of the resulting novel CPCM was enhanced to 1.48 W/m·K. The CPCM exhibited a desirable melting point of 47.5 °C and better shape stability. The phase-change period of the novel CPCM was 30% less than that of SAT-KCl-urea. The novel SAT-KCl-urea/EG CPCM showed great potential for latent energy storage.
Abstract 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 °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/m·K, approximately 5.3 times that of the SAT–KCl–urea composite salt (0.28 W/m·K). The required phase–change duration of the SAT–KCl–urea/EG CPCM was approximately 30% less than that of the SAT–KCl–urea composite salt. After 100 thermal–cycle tests, the SAT–KCl–urea/9 wt% EG CPCM retained a desirable phase–change temperature of 45.9 °C, high latent heat of 190.8 kJ/kg, and an acceptable supercooling degree of 1.56 °C. These thermal feature results showed that the SAT–KCl–urea/9 wt% EG CPCM exhibited great potential for use in the HPLHTES systems.
Thermal conductivity enhancement of a sodium acetate trihydrate–potassium chloride–urea/expanded graphite composite phase–change material for latent heat thermal energy storage
Jin, Xin (author) / Xiao, Qiuke (author) / Xu, Tao (author) / Huang, Gongsheng (author) / Wu, Huijun (author) / Wang, Dengjia (author) / Liu, Yanfeng (author) / Zhang, Hongguo (author) / Lai, Alvin C.K. (author)
Energy and Buildings ; 231
2020-11-09
Article (Journal)
Electronic Resource
English
| British Library Online Contents | 2018
| British Library Online Contents | 2018
| British Library Online Contents | 2018
| British Library Online Contents | 2018