Research On The Transformation Of Existing Multi-storey Residence In Xuzhou Under The Guidance Of Low-carbon Thought

Among the existing urban buildings,there are a large number of residential buildings with high carbon emissions,and low-carbon transformation of them will help to achieve the’double carbon’goal.Therefore,this thesis takes the existing multi-storey residential buildings in Xuzhou as the research object to study how to reduce the carbon emissions of multi-storey residential buildings.Firstly,this thesis investigates 52 multi-storey residential communities in Xuzhou urban area.On the basis of investigation,five multi-storey residential communities are selected for questionnaire survey and two multi-storey residential communities are measured on site for 7 days.（1）Through the analysis of SPSS software,the reliability coefficient of the questionnaire is 0.831,and the validity KMO value is 0.823.The results of the questionnaire show that 64%of the residents agree with the improvement of photovoltaic panel shading and envelope structure performance.In terms of renewable energy options,86.8%of residents chose solar energy.（2）The measured results show that the outdoor temperature of the existing multi-storey residential quarters in Xuzhou can reach about 43°C in summer,the average outdoor temperature is about 35°C,and the average indoor temperature is about 30°C.It shows that multi-storey residential indoors need a lot of energy consumption to provide refrigeration in summer;the average thermal comfort PMV of the south bedroom of the multi-storey house is about 1.6,which does not meet the requirements of indoor thermal comfort.Secondly,this thesis summarizes and compares the evaluation criteria of building energy consumption and carbon emission in the existing research,and clarifies the evaluation criteria adopted in this thesis.Finally,the comprehensive energy saving rate of building power consumption and the reduction rate of carbon emission during the whole year of building operation are used as the main quantitative indicators.Thirdly,the software model is established and the relevant parameters are set by using the GBSWARE series software.Quantitative simulation analysis is carried out around the renovation of multi-storey residential envelope structure,mainly studying five influencing factors:roof insulation materials,external wall insulation materials,external window glass materials,residential shading renovation and residential window-wall ratio renovation.According to the orthogonal test,the best combination is that the roof insulation layer is 80 mm thick extruded polystyrene board,the outer wall insulation layer is 60 mm thick extruded polystyrene board,the outer window glass selects the high transmittance Low-e double-layer insulating glass,the south sunshade is 400 mm and the south window wall ratio is 0.55.Under this combination,the average comprehensive power consumption of residential buildings is 40.88 k Wh/m²,the annual carbon emission of buildings is 30.680t CO₂,and the carbon emission per unit area during operation is 18.92 Kg CO₂/m².From the perspective of renewable energy utilization,the software simulation shows that when the tilt angle of the solar photovoltaic panel is 20°and the orientation angle is 20°south by west,the maximum solar radiation received by the photovoltaic panel in one year is about 4589MJ/m².On this basis,it is concluded that the annual power generation per square meter of photovoltaic panel is 138.8 k Wh and the carbon emission reduction is 0.08 t CO₂/a.Finally,taking Xuzhou Ziwei Huayuan community as an example,the low-carbon transformation design practice of multi-storey residential buildings is carried out.the comprehensive power consumption of the residential building after the transformation is 36.9 k Wh/m²,and the comprehensive energy saving rate is 50.6%.The annual operating carbon emissions are 26.960 t CO₂,the carbon emissions per unit area of the residential operation stage are 16.63 Kg CO₂/m²,and the carbon emission reduction rate is 48.6%.The results show that there is a good low-carbon energy saving effect after the reconstruction of existing multi-storey residential buildings in Xuzhou area.