A Studyon On Experiment And Energy Conservation Simulation For The Performance Of Paraffin-based Building Phase Change Material Wallbpard

With the increasing demand for indoor thermal comfort,building energy consumption has gradually increased in recent years.So the development of energy saving materials and the effective utilization of renewable energy has become a hot issue in the field of building energy saving in China.In this paper,a system of solar energy coupling phase change material wallboard was designed,which can not only achieve the purpose of transferring load,but also improve the utilization rate of solar energy,achieving the better energy saving effect.In this study,a new type of enclosure structure—phase change material wallboard was prepared by using the vacuum adsorption method,with paraffin as phase change material,expanded vermiculite and expanded perlite as the supporting materials respectively.According to the DSC,SEM,thermal conductivity and thermal performance tests conducted on it,the lightweight expanded perlite phase change material wallboard with higher latent heat value was coupled with the trough solar collector for heating.In the daytime,the phase change material stored the heat supplied by the solar energy in the phase change material wallboard;in the night,the phase change material released the stored heat,raising the indoor temperature at night and saving the use of auxiliary heat source.The building model of phase change material wallboard coupled solar energy and its contrast model—solar building model were established in TRNSYS.Two kinds of mathematical analysis methods,error analysis and Bland-Altman consistency analysis,were used to analyze the experimental values and simulated values.The results show that the average relative error is less than 10%,and the point outside the conformance boundary is less than 5%.Based on the validated models,the area of solar collector,pump flow rate and thickness of phase change energy storage plate were optimized,and the best optimization value was obtained through comparative analysis of indoor thermal environment.The results show that the condition,under which the collector area is 4m~2,the flow rate is80kg/h,and the thickness of phase change material wallboard is 40mm,is the best.At the same time,the operation results of three solar radiation type days(sunny type,cloudy type,overcast type)were respectively analyzed,and the system showed more excellent thermal performance in the sunny day.In order to study the application effect of phase change material wallboard in the system,the operation results under two cases with and without auxiliary heat source separately were comparatively analyzed.The results indicate that the application of phase change material wallboard can effectively smooth the indoor temperature fluctuations,and significantly reduce the power consumption of auxiliary heat source,which decreased by43%in the simulation time.Besides,the economic analysis of the phase change material wallboard system coupled with solar energy was carried out.Compared with the air-conditioning system and the radiator system,this system was featured with high initial investment and low running cost.Its static investment recovery period is 2.34 years relative to the air conditioning system,and 4.87 years relative to the radiator system.Although the static investment recovery period of the system is relatively long,its benefits in energy saving and environmental protection is prominent,worth further research.