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This research aims to analyze the effect of phase change energy storage wall  on the internal thermal environment in high-sunshine passive solar  residential buildings. The residential buildings in Lhasa are taken as  research objects, and the differences in indoor and outdoor thermal  environments of the residential buildings in winter are first evaluated.  Then, the energy storage wall model based on phase change material is  constructed, the meteorological data of the winter solstice day is used to  simulate, and the changes of the thermal environment in the room are  detected. The results showed that the average solar radiation intensity of  the dwellings in Lhasa is 441.8 W/m2, and the average scattering intensity  is 156.3W/m2. The average humidity and temperature of outdoor air are 24.4%  and 1.54°C, respectively. The temperature difference of the indoor south and  north bedrooms is 3.3°C, the internal temperatures of the indoor south and  north walls are 13.4°C and 7.9°C respectively, and the temperature  difference is 5.5°C. After the adoption of phase change energy storage  materials, the indoor temperatures of the south and north walls on the  winter solstice day are 16.75°C and 16.52°C respectively, with a temperature  difference of 0.23°C. The inner surface temperatures of the south wall and  the north wall increase by 25.0% and 109.1% respectively after adopting the  phase change energy storage wall, indicating that applying the phase change  energy storage wall to the passive solar residential buildings in Lhasa can  effectively improve the indoor thermal environment.

Analysis of thermal energy storage system for energy saving reconstruction of building in region with heating provision and high sunshine