The dissertation marks off air - condition calculating period and heating calculating period by the weather , so ehtv and other factors are mean value to air - condition calculating period and heating calculating period 本文以室外气象条件为依据划分各地空调、采暖计算期, ehtv指标各参数是空调、采西安建筑科技大学博士学位论文暖计算期的平均值。