Research On The Indoor Light And Thermal Environment Of Building Filled PCM Glass Curtain Wall With Insulation In Cold Region

As a commonly used form of enclosure structure in modern architectural engineering,glazed curtain walls merit advantages in aesthetic and lighting.However,with the poor thermal insulation and high transmittance of solar radiation,traditional glass curtain walls possess deficiency in architectural applications such as high energy consumption,large fluctuations in room temperature,and inferior indoor light and thermal environment.Therefore,a new type of glazed curtain wall structure that is the three-layer glass curtain wall system combining silica aerogels and phase change material(TGCW+SA+PCM)is proposed in this paper.The indoor light and thermal environment of buildings with the new type of glazed curtain wall structure is studied in the cold region.The indoor environment is comprehensively evaluated based on the two indoor comprehensive evaluation indicators,the indoor environmental quality index(EQI),and the building quality index(BQI).The research results of this paper is to provide theoretical support for the engineering application of thermal insulation phase change glazed curtain walls in cold regions buildings.The specific research content is as follows:1.A numerical model that is the indoor thermal environment of multi-layer glazed curtain walls is established.The indoor thermal environment of three-layer glass curtain wall system combining silica aerogels and phase change materials(TGCW+SA+PCM),the three-layer glass curtain wall system combining air and phase change materials(TGCW+Air+PCM),and the three-layer glass curtain wall system combining air(TGCW+Air+Air)is compared and analyzed under sunny and cloudy conditions.The research shows that the three-layer glass curtain wall system combining silica aerogels and phase change materials has better effect in improving the indoor thermal environment,and the advantages are more significant in sunny conditions.2.The influence of phase change temperature and interior wall temperature on the indoor thermal environment are studied.The PMV and PPD are used as evaluation indexes.And the thermal comfort environment is assessed by the comfort time.The results show that the thermal comfort environment is influenced by phase change temperature and interior wall temperature.The indoor comfort time can be extended by 4h when phase change temperature increases from 10°C to 16°C.The indoor comfort time can be extended by 12 h when interior wall temperature increases from 18°C to 27°C.3.A numerical model of the indoor light environment model of multi-layer glazed curtain walls is established,and the indoor light environment of the three-layer glass curtain wall system combining silica aerogels and phase change materials and three-layer glass curtain wall system combining air is compared and analyzed under sunny and cloudy conditions.And the light environment evaluation index is constructed to evaluate the indoor light environment.The research shows that the indoor light environment of the two types of glass curtain walls is more comfortable at 15:00 in sunny conditions,and the structure of the three-layer glass curtain wall system combining silica aerogels and phase change material has better effect in reducing indoor glare and indoor light environment.Under cloudy conditions,the indoor light environment comfort time of two types of glass curtain walls can reach 5h.However,in order to meet the requirements of indoor light environment,it can be improved by lighting 16:00 later.4.Combined with the light and thermal environment,the indoor comprehensive evaluation index is constructed.The indoor light and thermal environment of different types of glass curtain walls are evaluated comprehensively.The results show that the three-layer glass curtain wall system combining silica aerogels and phase change material is more comfortable than the indoor environment of other structures.The EQI of the three-layer glass curtain wall system combining silica aerogels and phase change material is 9.5% and 8.10%higher than that of the three-layer glass curtain wall system combining air in sunny and cloudy conditions,respectively.From the perspective of light and thermal comfort,the three-layer glass curtain wall system combining silica aerogels and phase change material is more suitable than the three-layer glass curtain wall system combining air in cold areas.