Research On Thermal Performance Of Residential Building Parapet Wall In Severe Cold Area

With the large-scale construction of residential buildings and the increase in building energy consumption,today’s society has launched a series of studies on how to reduce building energy consumption.Energy conservation is the top priority of sustainable development.The roof is an important part of the building envelope.As the uppermost part of the entire building system,the energy consumption of the roof parapet cannot be ignored.The parapet thermal bridge will not only increase the overall energy consumption of the building,leading to an increase in the overall heat transfer coefficient of the roof,but also a series of effects of the parapet thermal bridge will increase the overall heat transfer of the roof and affect the surface temperature of the indoor wall.Therefore,the roof daughter The wall node thermal bridge is very necessary to reduce the overall building energy consumption.First of all,from the perspective of the thermal comfort environment of the building,the reasons for the mold on the inner surface of the wall and the disadvantages to the human body are analyzed,and the concept of mold temperature is proposed,which compares the dew point temperature in my country with the mold temperature used in more advanced countries in the field of building energy conservation.The difference between the mold temperature point is used as a measure of the simulation experiment of this paper.Secondly,the thermal performance of the roof parapet node is analyzed.The study shows that changes in heat transfer coefficient,heat preservation method,and thermal bridge will directly affect the heat transfer of the parapet node,leading to changes in the surface temperature of the building’s indoor corners,thus causing the wall.get mouldy.In addition,the geometric thermal bridge generated by the parapet node will affect the inner surface temperature of the wall corner.Thirdly,in order to study the best method of residential building roof parapet wall suitable for climatic conditions in severe cold regions of my country,starting from adjusting the insulation method,height of parapet wall and thickness of insulation layer,combined with my country’s thermal engineering related regulations,the two-dimensional steady-state method,namely Heat2,is used.Thermal bridge simulation software calculates the inner corner surface temperature and actual heat flow distribution of the parapet node under different climate zones(severe cold zone ABC),and compares it with the moldy temperature point when the indoor relative humidity is60%.Finally,combined with the simulation results of the software Heat2,when the parapet wall in severe cold areas of my country is selected as the all-inclusive insulation method,the thermal performance of the node is better than that of the half-cladding insulation method,and the inner surface temperature at the corner of the parapet wall is higher.The heat preservation method,combined with the mildew temperature point,proposes the parapet height and insulation layer thickness suitable for residential buildings in severe cold areas in my country,and the parapet height and insulation thickness suitable for areas A,B,and C in severe cold areas are different.It not only reduces the energy consumption of the building roof envelope structure,but also guarantees the indoor thermal comfort of the building.