Abstract
High temperature composite form-stable phase change material is a promising technology to promote and utilize renewable energy and improve the system efficiency. The hygroscopic property of Na2CO3-K2CO3-based composite form-stable phase change material was studied. This study focuses on the effects of material modification and surface treatment on the moisture absorption properties of phase change materials. Experimental results show that the methods of doping zeolite, silica gel and modified magnesium oxide have limited influence on the hygroscopicity of phase change materials. Some methods are not practical because of the limitation of operating temperature. The surface treatment methods can effectively suppress the hygroscopicity of the phase change material. Especially, when the metal film is wrapped, the moisture absorption of the material can be effectively controlled. The combination of coating and wrapping can further protect the material from the moisture as in long-term experiments, the weight gain by moisture absorption is no more than 5%.
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