Experimental study on performance of composite wall of capillary and phase change material

 In order to obtain the energy storage and release characteristics of the composite wall of capillary and phase change material, an experimental model of the composite phase change wall is established in this paper. The composite unit of air-source heat pump and solar collector is used as the cold and heat sources for the laboratory and the model experiment. The effects of different water supply temperatures and energy storage time length on the phase transformation degree of the composite phase change material and the heat flux of indoor wall surface under winter conditions are studied. The experimental results show that when the mass percentage of expanded graphite is 5%, the composite phase change material has a suitable thermal conductivity and a large latent heat. When the water supply temperature and energy storage time length are 30 ℃, 8 h and 32 ℃, 6 h, respectively, the phase change process of the composite phase change material is completed during heat storage, the energy release effect is better, and the mean heat flux is 40.328 W/m2 and 39.221 W/m2, respectively.