Application Design And Optimization Analysis Of Phase Change Energy Storage Enclosure Wall In Hot-summer And Cold-winter Area

The rapid development of society is inseparable from energy.With the further acceleration of social development,energy consumption is getting faster and faster.The energy currently used is generally non-renewable energy.Therefore,the development,recovery and reuse of energy are still the focus of future economic development and scientific research.In the global energy consumption,building energy consumption accounts for about 30%,so energy-saving design for buildings is very important.In the vast territory of China,the hot summer and cold winter area is one of the five major climate regions,covering a large area,and the climatic conditions in winter and summer are relatively harsh,so the heating/cooling energy consumption in the hot summer and cold winter area is huge.At present,measures aimed at building energy saving include external insulation of external walls,internal insulation of external walls,and internal wall insulation.In recent years,there have been more and more researches on combining phase change materials with building envelopes and using the special properties of phase change materials for energy-saving design.The combined use of phase change materials and building envelope structure can improve the thermal characteristics of the envelope structure,improve the indoor thermal comfort,and reduce the energy consumption of building operation.It is a research hotspot for energy conservation of building envelope structures at home and abroad.In this paper,Nanjing area is taken as a typical research area of hot summer and cold winter area.The meteorological data of Nanjing area are analyzed.The analysis results show that the Nanjing area is damp and hot in summer and cold in winter.The demand for comfort,especially for the thermal comfort in summer,so the design of the building enclosure wall should pay more attention to summer heat insulation.Based on the one-dimensional heat conduction model of the phase change enclosure wall,this paper analyzes the thermal performance parameters of the phase change material with the best temperature adjustment performance in summer and winter in passive buildings.Good temperature regulation performance,based on the theory of effective energy maximization,has proposed optimization schemes of different combined phase change materials.The research results show that the use of three-layer combined phase change materials can play a better temperature regulation role throughout the year The annual thermal comfort time is extended by 910 hours.Then,in order to study the energy-saving effect of phase-change materials in active buildings,this paper establishes a civil building model in Nanjing through EnergyPlus software,and first calculates the phase change temperature and phase change with the best energy-saving effect in summer and winter through simulation Based on the material thickness,nine optimization measures were proposed.From the results obtained from multi-angle analysis,the best combined phase change material was selected,and then the energy saving effect at different installation positions was analyzed.The results of the study show that considering multiple factors,the annual energy saving effect when using the four-layer combined phase change material is better.Compared with the ordinary envelope structure,the power saving rate can reach 26.97%.