Study On Energy Saving Potential Of The Double Shape-Stabilized Phase Change Material Wallboard Using In The Major Climate Zones Of China

Research on shape-stabilized phase change materials(SSPCMs) wallboard is becoming a hot spot recently. It is a new building envelope used for energy-saving currently. This study proposes a new wallboard structure – double shape-stabilized phase change materials wallboard, which has traditional wallboard in the middle, the external SSPCM layer active in summer and the internal SSPCM layer active in winter. The structure could improve the indoor thermal comfort and reduce the building energy consumption. This paper aims to analyze the energy saving potential of this structure using in the five typical climate zones in China.Paraffin as the main material was used in this study, and expanded graphite was added to improve the thermal conductivity, and then mixing it with high-density polyethylene to keep its shape without leakage when melting. The phase change temperatures of paraffin range form-5 to 66℃, and we can get the specific phase change material by mixing paraffin with different melting temperatures.In this paper, dynamic heat transfer model of PCM building and reference building was developed by TRNSYS software. Meteorological data in typical cities(Harbin, Beijing, Wuhan, Guangzhou, Kunming) of each climate zone were selected for simulating. The phase change temperature and thickness of SSPCM were optimized in PCM building. The energy consumption and thermal performance of SSPCM building and the reference building were compared.The effect of the double SSPCM wallboard used in each typical climate zone was analyzed in this paper. The optimal thickness and phase change temperature of each wallboard were obtained while the potential of energy saving percentage was maximal. The relationship between the energy saving potential and the climate was summarized. It might be helpful for engineering application of the double SSPCM in each typical climate zone of China.