The influence of wall orientation and exterior surface solar absorptivity on time lag and decrement factor

摘要

In this work,an analysis and numerical study have been carried out in order to determine how time lag and decrement factor are affected by wall orientation and exterior surface solar absorptivity for specific climatic conditions in Budongquan station of Qinghai-Tibet railway.The model employing a dynamic thermal-network simulates heat transfer through the wall according to the measured data.The time lag and decrement factor with different wall orientation and surface absorptivity are investigated based on the hourly heat flow density from outside to inside of building wall.The results of present study are useful for reducing the energy load demands by predicting the thermal reaction of building.