Experimental Study on Heat Storage/Release Performances of Composite Phase Change Thermal Storage Heating Wallboards Based on Photovoltaic Electric-Thermal Systems

The rapid development of photovoltaic technology provides more possibilities for the efficient application solar energy in buildings. This research proposed a phase change material (PCM) heat storage wall system with “four-layer” structure. A performance test platform using low voltage DC was built to study mechanism electric thermal conversion graphene electrothermal film and transfer characteristics As shown experimental results, under voltages 24 V, 32 V 42 (1) increase voltage, temperature increases, while its efficiency decreases from 85% 75%; (2) during process, because latent characteristics, PCM wallboard is 3~5 °C lower than that cement wallboard, but effective increases by 59~65%; (3) release 41–78%, maximum 98%; (4) at can completely phase. theoretical calorific value equivalent hourly power generation 1.45 m2 modules. results provide basic data integration their