A numerical study of building integrated with CaCl2 center dot 6H(2)O/expanded graphite composite phase change material

作者：Ye, Rongda; Lin, Wenzhu; Fang, Xiaoming^*; Zhang, Zhengguo^*

来源：Applied Thermal Engineering, 2017, 126: 480-488.

DOI：10.1016/j.applthermaleng.2017.07.191

• Phase change material
• Heat transfer
• Calcium chloride hexahydrate
• Numerical simulation
• Building energy saving

Integrating phase change material (PCM) into traditional building envelopes can decrease the building energy consumption and improve the indoor thermal comfort by enhancing the heat storage capability. In this work, CaCl2 center dot 6H(2)O/expanded graphite (EG) was employed to fabricate the PCM panels for building envelope as a low-cost PCM. In order to give full play to the role of CaCl2 center dot 6H(2)O/EG, its characteristic in structural insulated panel (SIP) was investigated numerically under different conditions. The enthalpy porosity technique was used for modeling the solidification/melting process and it was validated by experiment. Temperature time lag, temperature decrement factor and energy saving rate were used to evaluate the dynamic thermal characteristics of the building envelope. The results showed that the density and thermal conductivity of PCM had little effect on the thermal performance of building envelope. However, the change of PCM panel thickness, building orientation, climate region and building construction would affect the phase change process of the PCM panels, which would have a certain influence on the room temperature. By analyzing the effect of CaCl2 center dot 6H(2)O/EG on the thermal performance of the building envelope under different influencing factors, it will provide effective guidance for the selection and use of PCM.

• 出版日期2017-11-5
• 单位华南理工大学