The Research Of Thermal Characteristic Of Phase Change Wall Room Base On Solar Hot Air

In recent years, the renewable energy development and utilization have become a hotspot issue of our country building energy conservation field study. Improving the utilization of renewable energy and saving the traditional energy are an effective way to reduce our country continuous higher heating energy consumption. This topic applied solar energy hot-air to replace the traditional energy for heating and put phase change materials on building interior. The compound heating system can solve this problem that in the night or cloudy days heating ability of the solar energy air heating system is zero.The research significance of the solar energy hot-air and phase change wall composite heating is expounded. We researched further its structure and properties.The considerable research value of both combination in renewable energy development and utilization is explained.The experimental object of study was in the residence of the old construction headquarter of Shenyang Jianzhu University. The jagged solar energy air collector was established on the south exterior wall lateral of the ground floor of the building. The low melting point common melting substance of Capric acid and Laurel acid is the best PCM for this research, which is both appropriate melting point and larger heat of fusion under continuous heating condition. The mixture ratio (quality ratio) of the common melting substance is 66:34. The sealed PCMs by DN20 PE pipe mounted on the western interior wall lateral of the test room and made phase change wall. By experimental method, we studied the indoor thermal environment of solar energy hot-air and phase change wall composite heating system.Using computational fluid simulation software and finite element analysis simulation software, the heat transfer process of solar energy air collector and the temperature distribution of thermal surface on phase change wall are analyzed. The absorption or release heat of phase change materials in melting or solidification process is simulated. The temperature fluctuations of phase change wall are analyzed in this period of time. Results: The temperature field distribution in collector is equality. The temperature range of which is between 30 centi-degree and 70 centi-degree. The experimental data and simulation data are coincident. The simulation results verified the reliability. But the supply air temperature difference is big in a single system and indoor temperature fluctuates significantly. Using solar energy hot-air and phase change wall heating room, indoor temperature fluctuation is small than the indoor temperature fluctuation of the single solar energy hot-air room solar and with external conditions change defects of solar energy hot-air heating were improved.According to the experiment research, theoretic analysis and numerical simulation, it can be seen that the solar energy hot-air and phase change wall composite heating is an effective way of absorption and utilization of solar energy transient heat. Solar energy provide heating load. In daytime it provides direct heating. In heating night, the phase change wall can release heat that it was stored by phase change materials, maintain indoor temperature, have time delay function and reduce indoor temperature fluctuations. Finally, the heating energy-saving of the solar energy hot-air is realized. It will have certain economic benefits. The composite heating mean will have a good application prospect.