Investigation and analysis of current indoor thermal environment in northern urban residences with centralized heating

This study conducts a questionnaire survey from January 16 to October 30, 2020 to investigate and analyse the current situation of residential thermal environment with centralized heating in winter in North, Northwest, Northeast and some typical cities in Central and East China. The survey mainly involves the general situation of heat users’ buildings, heating methods and their charging methods, indoor ambient temperature, family members, personnel clothing, countermeasures when the room temperature is low, etc. The survey results show that more than 60% of the investigated heat users in Northeast and Northwest China have room heating temperatures of more than 22 ℃, more than 40% of the investigated heat users in North China have room heating temperatures of more than 22 ℃, and most of the investigated heat users are dressed in late spring and early autumn. The clothing style of indoor personnel under the acceptable “mild cold exposure” temperature in winter is further studied, in order to provide a reference for the proposal of green low-carbon heating mode to meet the simple and comfortable thermal environment.