Research On Indoor Inhomogeneous Radiation Field Under The Influence Of Solar Radiation

Solar radiation has a significant impact on indoor radiant environment,and the part acting on indoor personnel causes change on human radiant heat gain and radiant asymmetry,affecting the overall and local heat comfort.At present,most of the studies calculated indoor human solar radiant heat gain through numerical derivation,lack of experimental verification,and complicated,not applicable to engineering applications.In addition,less research focuses on the impact of asymmetric radiant environment on the human body under solar radiation.This paper first compares the indoor solar radiant intensity by Daylight Coefficient（DC）Method and experiment.The results show that DC Method has great accuracy.Besides,based on result of DC Method,diffuse part of Solar Cal（SC）Method has been modified and its accuracy is improved.Then indoor humanΔMRT under solar radiation is calculated through modified SC Method.Then,based on the regression analysis of the me asured data,this paper puts forward a method for predicting indoor solar radiation intensity under solar direct area（R²=0.8671）and non-solar direct area（R²=0.8671）.The results show that using indoor solar illuminance can predict indoor solar radiant intensity well.Besides,indoor humanΔMRT under solar radiation is calculated through illuminance predicting method,and the results are compared with SC Method.At the same time,a method for calculatingΔT_pr based on simplified human model through DC Method has been put forward,and the influence of the inner surface temperature of different envelope on the results is analyzed.Besides,ΔT_pr is calculated based on solar illuminance,and results are compared with DC Method.Finally,based on the historical meteorological data of Changsha,the annual hourly PMV and PD_solar at 1m and 3m from the south outer window of th e building are calculated,and indoor radiant environment comfort is evaluated.The results show that solar radiation has an obvious influence on indoor radiant thermal environmen t and comfort level,and the influence of solar radiation on indoor com fort is closely related to the distance from the outer window.In summary,this paper proposes two methods to study the heat gain characteristics and asymmetric radiation effects of sol ar radiation on the indoor human,and the research on the indoor radiant heat environment is improved.This paper will provide reference for the study of human thermal comfort in building radiation environment.