Preparation and hygrothermal performance of composite phase change material wallboard with humidity control based on expanded perlite/diatomite/paraffin

Abstract

Phase change material (PCM) can reduce the indoor temperature fluctuation and humidity control material can adjust relative humidity used in buildings. In this study, a kind of composite phase change material particles (CPCMPs) were prepared by vacuum impregnation method with expanded perlite (EP) as supporting material and paraffin as phase change material. Thus, a PCM plate was fabricated by mould pressing method with CPCMPs and then composite phase change humidity control wallboard (CPCHCW) was prepared by spraying the diatom mud on the surface of PCM plate. The composition, thermophysical properties and microstructure were characterized using X-ray diffraction instrument (XRD), differential scanning calorimeter (DSC) and scanning electron microscope (SEM). Additionally, the hygrothermal performance of CPCHCW was characterized by temperature and humidity collaborative test. The results can be summarized as follows: (1) CPCMPs have suitable phase change parameters with melting/freezing point of 18.23 °C/29.42 °C and higher latent heat of 54.66 J/g/55.63 J/g; (2) the diatom mud can control the humidity of confined space with a certain volume; (3) the combination of diatom mud and PCM plate in CPCHCW can effectively adjust the indoor temperature and humidity. The above conclusions indicate the potential of CPCHCW in the application of building energy efficiency.

Keywords

thermal storage / humidity control / phase change material / paraffin / expanded perlite / diatom mud

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