Experimental study on the thermal performance of water-heating wallboard with phase change material

In this paper, a simple model of composite phase change material (PCM) wallboard with hot-water heating system was made. The heat transfer performance and thermal storage property of this model were studied. A proper ratio of paraffin mixture was selected and jointed into the wallboard, with a phase change temperature of 27.8 V. According to the PCM´s property of thermal storage, hot water for heating can be supplied for only 8 hours a day, and then stop the hot-water. During this process, the changing values of heat flux and temperatures on wallboard´s surface were measured all the time. The results show that jointing the PCM into active water heating building envelope can maintain the heat flux in the wallboard to a certain degree so as to avoid indoor temperature and wallboard surface temperature fluctuate effectively after hot-water supply was stopped for a relatively long period of time; PCM wallboard can be a effective method of reducing heating and saving energy used in intermittent heating; when water supplied are kept at 45 V and 55°C, PCM wallboard can release lots of heat flux to meet heating needs. Maintenance structure has a certain impact on the heat storage and release. The results in this paper can provide references and basis for the heat transfer enforcement of phase change materials used in the wall.