Abstract
A kind of PEG8000 hydrogels as shape-stabilized phase change materials (SSPCMs) were prepared by using a simple sol-gel technique. Their thermal characteristics were studied under the modified mass ratio of PEG and water. The optimized PEG hydrogel (PEGH) was placed at high temperature of 70°C to remove excess liquid water. This temperature was less than the apparent melting temperature (74±1°C) but over its phase transition temperature of about 9°C. Obtained PEG gel displayed an excellent thermal energy density of 154.2J/g, and the value was twice that of reported form-stable composite PCM in literature. Therefore, it can be remarkably noted that the PEG hydrogel provides a new way for the preparation of SSPCMs, and has an important potential for heating/cooling applications in buildings.
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