Research On Methods Of Daylight Simulation In Winter City Based On Regional Sky Luminance Distribution Measurement

Daylight is an important part of people’s production and life.In recent years,Daylighting simulation of architecture based on regional daylight climate has gradually attracted people’s attention and been used widely.China has a vast territory,and therefore daylight climate turned to be different between different areas.For the severe cold regions,there are still some gaps in the measurement and research of daylight climate.To obtain and use the real regional daylight climatic conditions rationally is of great significance to improve the daylight simulation of building.Based on the above background,this paper first analyzes the related concepts of local daylight climate,and combs the method of daylight climate simulation,and then analyzes the factors which affect the accuracy of the daylight simulation,which provides a theoretical basis for later research.Secondly,according to the current situation of the lack of daylight climate data in severe cold regions,annual regional daylight climate measurement has been carried out.Furthermore,according to the relevant theory of daylight climate classification,the observed sky luminance data is calculated and classified to the appropriate sky type.The distribution of regional daylight climate was analyzed and discussed at different levels.According to regional daylight climate distribution,a typical sky model based on measured daylight climate was proposed,and the daylight climate database was further constructed.The daylight extraction simulation environment input conditions of the regional building realized the optimization of the input of daylight climate data input in the daylighting simulation,and further optimized the process of the daylighting simulation method,and constructed the daylight simulation method based on the regional daylight climate.In order to verify the effectiveness of the method,a test was designed for verifying the building daylighting performance simulation.From the perspective of illuminance level,the comparison of the simulation value and actual measurement was carried out for discussion,the three conditions of cloudy sky,intermediate sky,and clear sky were selected for the actual daylight measurement and computer daylight simulation of building lighting.Based on the comparative analysis of indoor and outdoor illumination levels,the applicability of the proposed simulation method in this paper is confirmed to be appropriate to the severe cold region.The research on the daylighting simulation method of building in the severe cold region based on regional sky luminance measurement could help the architects to improve the accuracy and efficiency of the daylight performance prediction of building in the daylight designing or predicting process.It is of great significance for improving the building simulation process.