Abstract：To solve the problem that the single phase change material (PCM) in buildings could not meet the requirements of energy conservation and comfort throughout the year, the double layers PCM with different phase transition temperatures were simultaneously filled into a multilayer flat wall to form a doublelayer PCM wall. The sensible heat capacity method was used to analyze the heat transfer process of PCM, and the mathematical model was discretized by finite difference method. The MATLAB software program was used to calculate and analyze the doublelayer PCM wall structure with different structures under typical hot summer and cold winter climate conditions. Through the attenuation multiple, the theoretical PCM optimal phase change temperature zone was explored, and the PCM with thermal property parameter close to the theoretical optimal value was selected from the PCM used in the actual building envelope structure. The thermal performance of PCM wall was verified near to that of ideal PCM wall. The results show that when the double layers PCM are located in the middle of wall, the attenuation multiple is the largest with the most stable temperature on the inner surface of envelope structure. The utilization ratios of the low phase change temperature PCM in winter and the high phase transition temperature PCM in summer are both between 0 and 100%, which can make the wall maintain high thermal performance.
张源, 吴志伟, 葛凤华, 李维孝. 夏热冬冷地区双层相变材料墙体热工性能分析[J]. 江苏大学学报（自然科学版）, 2019, 40(4): 465-471.
ZHANG Yuan, WU Zhi-Wei, GE Feng-Hua, LI Wei-Xiao.
Thermal performance analysis of a doublelayer phase change
material wall in hot summer and cold winter area[J]. Journal of Jiangsu University(Natural Science Eidtion)
, 2019, 40(4): 465-471.
2019, Vol. 40 
