Study On The Heat Transfer Performance Of A Phase Change Energy Storage Wall With Air Layer

Energy plays an important role in people's life.The rapid development of human society leads to the rapid consumption of energy.Energy conservation and emission reduction has become an arduous and urgent task in front of human beings.One of the ways to achieve building energy saving is to enhance the thermal performance of the building envelope.The high thermal storage of phase change materials(PCM)can significantly improve the thermal capacity of the envelope and reduce the indoor load.In order to make better use of latent heat of phase change materials to improve indoor thermal comfort,according to the theory of phase change heat transfer,this paper combs the scholars' research on all aspects of phase change wall in recent years.In this paper,a phase change wall with air layer is studied by combining experimental research and numerical simulation.The specific research contents are as follows:(1)Based on the optimization of the wall structure,a building wall structure with phase change materials is designed,and the actual phase change room model is built in the experimental plant.At the same time,this paper uses FLUENT software to simulate the heat transfer performance of three different PCM tube distribution positions,analyzes their differences,and finds out the best PCM tube distribution position.The results show that the heat storage and release performance of phase change wall is closely related to the indoor heat source temperature and heat source duration.(2)The heat transfer performance of three different PCM tube locations was simulated by FLUENT software,and the differences were analyzed to find the best PCM tube location.The results show that the PCM pipe is evenly arranged in the middle of the air layer,which has a good effect on the heat transfer of the wall.(3)According to the actual temperature parameters of winter and summer in Hengyang area,the regulation of indoor thermal environment by different phase change temperature is studied,and the best phase change temperature suitable for winter and summer is found,so as to select the best phase change temperature to maximize the latent heat utilization of phase change materials.The results show that it is better to choose phase change materials with 17 ? in winter and 29 ? in summer.(4)Taking the winter working condition as an example,the indoor thermal environment regulation of the phase change wall in this paper and the general phase change wall is simulated and compared.The results show that the indoor average temperature fluctuation of the phase change wall with air layer is smaller,and finally the minimum temperature difference is 0.2 ?.In general,the phase-change wall with air layer can make the indoor thermal environment better maintain comfortable state.