Thermal properties of composite PCM wallboard in low-temperature hot Water radiant system

Low-temperature hot water radiant system is widely applied due to its energy saving, providing comfortable environment and low heating temperature requirement. Here, based on the research on the phase change material (PCM) wallboard radiant system, a new kind of composite PCM wallboard is put forward, in order to improve the efficiency of energy storage. Heat transfer model of composite PCM wallboard is set up, and then the storage and release energy processes are conducted with the CFD software. The influence of composite PCM on the room environment is compared with that of the wallboard without PCM layer. Moreover, the influences of phase change temperature, the thickness of composite PCM layer on the wallboard surface temperature and heat flux are studied to account for the heat transfer process in the composite PCM wallboard. The results presented here can provide a theoretical fundamental for improving a comfortable heating system, and give a technology support to develop the application of low-grade energy.