Ultrathin envelope thermal performance improvement of prefab house by integrating with phase change material

Owing to lack of ventilation and air conditioning equipments in prefab house under general circumstances, the condition of its indoor thermal environment are mainly determined by the heat preservation and insulation performance of ultrathin envelope. In order to improve the thermal performance of ultrathin envelope, the combination of ultrathin envelope with phase change material (PCM) was chosen in this study. The heat transfer model of ultrathin envelope integrated with phase change material was established and verified. According to the climatic conditions of Chengdu city, the thermal performance of this new type ultrathin envelope was analyzed and evaluated by aid of numerical simulation for different PCM parameters, including PCM heat conductivity coefficient, phase change latent heat, phase-transition temperature and PCM layer position.