Study on Heat Storage and Release Characteristics of Embedded Capillary Dual-Effect Phase Change Plate Based on Sky Radiation Cooling and Solar Heat Collection

The utilization of natural energy and continuous building thermal environment regulation are often not synchronized. However, phase change envelope structures possess strong energy storage characteristics, enabling the migration and utilization of natural energy in both time and space. Nevertheless, conventional phase change envelope structures typically employ a single phase change material, making it difficult to adapt to both winter and summer operating conditions. This paper proposes an active heating and cooling system for embedded capillary dual-effect phase change top plate based on natural energy. Firstly, the thermal properties of the dual-effect phase change material are investigated, followed by the ANSYS simulation of the energy storage and release processes for both single phase change plates and the dual-effect phase change top plate under summer and winter conditions. Furthermore, an analysis of the energy-saving characteristics of the phase change plate is conducted. The results indicate that the dual-effect phase change top plate exhibits a balanced and longer cooling in summer and heating in winter, surpassing the energy-saving performance of a single phase change top plate throughout the year. The research findings of this paper can provide theoretical support for further studying the simplified model of the embedded capillary dual-effect phase change top plate and improving its energy consumption and indoor environmental characteristics in practical applications.