Optimisation of thermal characteristics of buried composite phase change energy storage walls

Improving the thermal insulation performance of building walls is the most effective way to save energy in buildings. In this paper, multiple construction forms of embedded composite phase change energy storage wall are proposed to study the heat transfer characteristics of the wall and its influence on the indoor thermal environment. The heat transfer law and mechanism of wall influence on indoor thermal environment are revealed. The results show that the error between the measured results and the numerical simulation results is less than 10%, which verifies the feasibility of studying the heat transfer performance of the phase-change wall by numerical simulation method. Under the condition that water does not flow, the temperature difference at the base of ordinary wall, S font, U font and back font phase change energy storage wall is 8.70℃, 8.80℃, 8.83℃ and 8.94℃, respectively. Under the working condition of water flow, the temperature difference of S-font, U-font and back-font phase change energy storage wall base is 5.00℃, 5.18℃ and 6.51℃, respectively. The smaller the coil spacing, the better the heat storage performance of the phase change wall. The phase-change energy storage wall can reduce the maximum indoor air temperature by 3.2℃, and effectively improve the indoor thermal comfort.