Study on Thermal Insulation with Phase Change Material in Building Skin(II)——Theory and Method for Thermal Insulation Design with Phase Change Material in Building

In this paper,the theory and method for determining the phase transition temperature and amount of phase change material(PCM) in thermal insulation design were firstly introduced.And then,taking the ordinary roof in Xiamen as an example,the application of the presented design method for thermal insulation with PCM was illustrated.The calculated results indicated that when PCM was used in building envelope for thermal insulation,only several millimeters were required.Moreover,because its thermal resistance could be neglected,the thermal insulation design with PCM could be carried out based on the assumption that PCM layer was not exist.Furthermore,the determination of PCM's type and its amount was associated with thermal effects of indoor and outdoor,material structures of envelope and the position of PCM layer,it should be selected based on the calculation.In addition,the indoor thermal effect,such as room ventilation,had very small impact on exterior surface temperature and heat flux,when the PCM was located on the exterior surface,the phase transition temperature and amount could be calculated only based on the outdoor thermal effect,therefore,the thermal insulation design with PCM became relatively simple.