jailcd2019-076: Thermal Performance of PCM Wallboard for Building Energy Saving

Abstract

Two kinds of diatomite-based phase change wallboards with different phase transition temperature were prepared, and the wallboards were attached to the exterior surface of the wall from a test small room for experimental  study. The effect of the wallboard location, the type of materials and the phase transition temperature on the thermal performance of the insulation of the wallboards were analysed. The phase change wallboards have the advantages of thermal storage performance. But the thermal resistance of the phase change wallboards was too small to reduce the indoor cooling load in summer when used on the exterior surface of the wall compared with the conventional polystyrene insulation board. The phase transition temperature suitable for the wallboard on the east wall and west wall was different from each other. In this study, the exterior surface temperature of the west wall was generally lower than that of the east wall, but the interior surface temperature of the MG35 board was lower than that of the MG42 board  when applied on the east wall. Therefore,  the  optimal  phase  transition  temperature  is  not  just  positively  correlated  with  the  outdoor meteorological conditions, but also relevant to the scenarios applied.