Research On Potential Overheating Risk In Residential Buildings And Related External Wall Construction Optimal Design In The Severe Cold Region Of China

With the global warming,summer temperatures in the Severe Cold Region of China are gradually rising,and the potential risk of overheating is also increasing year by year.As one of the main places for daily activities of residents,the summer indoor thermal comfort of residential buildings has gradually attracted attention in recent years.Relevant studies domenstrated that there is a risk of overheating in summer housing in regions with the same latitude or even higher latitude than the Severe Cold Region of China.The external wall is one of the main ways of indoor and outdoor heat exchange,and its thermal performance directly affects the indoor thermal environment.At present,the exterior wall design in the Severe Cold Region of China is still focused on meeting the thermal insulation requirements in winter,and the influence of the existing wall structure on the indoor thermal environment in summer is still unknown.This paper takes Harbin,a typical city in the Severe Cold Region of China,as an example to verify if there is a risk of overheating in residential buildings in summer.On this basis,the influence of existing wall construction on the indoor thermal environment of residential buildings in summer is studied.Firstly,this paper selects typical residential layout and exterior wall construction to build simulation model,and continuously simulates the summer indoor temperature of residential buildings.It shows that there are three obvious overheating periods of residential buildings in summer.Secondly,this paper builds the same external wall model in the laboratory as in the simulation stage,and continuously monitors the temperature changes of the internal and external surface of the wall during the selected overheating period.It is found that the wall is an important radiation source of the indoor thermal environment in summer,which will have a negative impact on the indoor thermal comfort.Finally,by comparing the performance of different insulation methods,wall materials,insulation materials and insulation layer thickness of wall structure,this paper proposes the optimal design atlas of wall construction that is more conducive to indoor thermal comfort of residential buildings in summer on the basis of meeting the requirements of winter insulation.