Study On The Performance Of A Double Shape-stabilized Phase Change Materials Wallboard In Climate Area With Hot Summer And Cold Winter

Shape-stabilized phase change material(SSPCM) is a new energy storage material with high energy storage density that could maintain shape unchanged during process of phase transition. The PCM integrated into buildings materials becomes a hot spot of building energy saving recently in the word, it could improve the thermal properties of building structure, improving indoor thermal comfort and decreasing energy consumptions.A new wall system was that of a three-layer sandwich-type panel with external/internal layer consisting of shape-stabilized phase change material(SSPCM) wallboard and middle layer consisting of conventional concrete. The external layer with a high value of a melting point was active in hot seasons, it could absorb heat during the day and delay the heat transmit into indoor. It release heat during the night and cool the external layer passively. The internal layer with a melting point near indoor set point temperature for heating was active in cold seasons. It could storage the redundant heat when the indoor temperature higher than the set point and release heat when the indoor temperature lower than set point. The SSPCM wall increases the indoor thermal comfort and attenuates the indoor temperature fluctuations all over a year.This paper developed a phase change heat transfer model and study the thermal characteristics and energy performance of SSPCM wall. Annual energy savings and peak load reductions for cooling/heating was studied numerically. Recommended optimum thickness and melting temperature ranges of double SSPCM layers were analyzed and given in this paper. It could provide more realistic results and confirm the technical feasibility.For the composite wall system incorporating phase change materials, the influences of the composite wall on indoor thermal environment, including indoor temperature, wall temperature and heat flux, were analyzed.Finally, the effects of double shape-stabilized phase change materials wallboard used in rooms with and without split variable/constant frequency air-conditioners were investigated. According to the energy saving percentage of air conditioning system, suitable air conditioning system could be obtained for the composite wall.Thermal characteristic and the energy saving potential of new SSPCM wall were analyzed in this paper. It could provide more realistic results and confirm the technical feasibility for phase change material wallboard used in climate area with hot summer and cold winter. It promotes the development of new building materials in building enclosure structure energy saving.