Preparation and thermal energy storage properties of building material-based composites as novel form-stable PCMs

In this study, ten kinds of composite phase change materials (PCMs) were prepared by impregnation of xylitol penta palmitate (XPP) and xylitol penta stearate (XPS) esters into gypsum, cement, diatomite, perlite and vermiculite via vacuum adsorption method. The form-stable composite PCMs were characterized by using SEM and FT-IR, DSC and TG analysis techniques. The maximum impregnation ratio of both XPP and XPS into gypsum, cement, perlite, diatomite, and vermiculite were found to be 22, 17, 67, 48 and 42 wt%, respectively. The DSC results showed that the melting temperatures and latent heat capacities of the composite PCMs varied from 20 °C to 35 °C and from 38 J/g to 126 J/g. TG investigations revealed that the composite PCMs had excellent thermal durability above their working temperature ranges. The thermal cycling test also exhibited that the composite PCMs had good thermal reliability and chemical stability. In addition, thermal conductivities of the composite PCMs were increased by addition of EG in mass fraction of 10%. All of the conclusions indicated that among the prepared composite PCMs, especially perlite and diatomite based-PCMs are potential candidates for energy storage applications such as solar heating and cooling in buildings since they had relatively higher latent heat capacity.

The present study is focused on the investigation of thermal energy storage potential of ten kinds of form-stable composite PCMs prepared by impregnation of XPP and XPS esters with gypsum, cement, diatomite, perlite and vermiculite via vacuum adsorption method. The form-stable PCMs were characterized structurally and morphologically by using SEM and FT-IR techniques. Thermal energy storage properties, thermal reliability and thermal durability of the composite PCMs were determined by using DSC and TG analysis techniques. In addition, thermal conductivity of the composite PCMs was increased by addition of EG in mass fractions of 10%. The results showed that the prepared ten kinds of composite PCMs had important thermal energy storage potential for solar space heating and cooling applications in buildings.Figure optionsDownload as PowerPoint slideHighlights
► Ten kinds of building composites were prepared as novel form-stable PCMs.
► The composite PCMs were characterized by FT-IR, SEM, DSC and TG techniques.
► The results indicated that the composite PCMs had good energy storage properties.
► The PCMs also had important potential for solar space heating and cooling applications in buildings.