Studies on Phase Change Characteristics of Binary Mixtures of Erythritol and MgCl2 centre dot 6H2O

摘要

This study investigated a novel idea of combining an organic component erythritol with an inorganic component MgCl2 centre dot 6H2O to prepare new PCMs suitable for domestic water heating.A DSC analysis indicated that mixtures containing less than 20 wt% MgCl2 centre dot 6H2O have melting temperatures above 353 K and latent heat values greater than 120 kJ/kg.Thermal cycling of erythritol-based PCMs in test tubes showed good stability in terms of nucleation temperature.However,the erythritol-based PCMs were found to undergo supercooling of about 50 K below the melting temperature,similar to erythritol.An analysis of the distribution of the salt hydrate component in the solid phase in a scale-up experiment revealed the salt hydrate's possibility of accumulating at the bottom of the unit.The effect of ultrasonic irradiation on prevention of component segregation was also demonstrated.