Study On Energy Saving Scheme Of Rural Residential Building Envelope In Hot Summer And Cold Winter Area

For the past few years,with the concept of energy conservation and emission reduction,carbon neutrality deeply rooted in the hearts of the people,China ’s building energy conservation work is accelerating.The implementation of the rural revitalization strategy has greatly improved the economic level of rural areas,the requirements of rural residents for living environment have gradually increased,and the building energy consumption of rural houses has also increased.However,due to the lack of energysaving technical guidance in the early stage of construction,the enclosure structure generally lacks thermal insulation measures,and the thermal performance is poor.It is not only difficult to meet the requirements of residents for thermal comfort,but also will bring energy loss.The current situation needs to be improved.This paper takes rural housing in Anqing as the research object.The advantages,disadvantages and adaptability of common thermal insulation measures of enclosure structure were compared and analyzed.The representative typical residential buildings were selected for the thermal environment test in winter and summer and the heat transfer coefficient calculation of enclosure structure.The results show that the thermal environment of rural houses in the region is poor,the heat transfer coefficient of the enclosure structure is too large,and the energy saving potential is huge.De ST-h software is used to simulate and analyze the external wall,roof and external window respectively,and the following results are obtained : Extruded polystyrene board(XPS)is suitable for exterior wall insulation,and the thickness of insulation layer should be controlled within60 mm.Polyurethane foam(PU)inverted roof was selected and the thickness of insulation layer was controlled within 50 mm.The outer window can reduce the heat transfer coefficient and energy consumption by selecting plastic steel window frame,double glass,increasing the thickness of glass hollow layer,coating on glass and reducing the transmittance of coating.The relationship between total load and thickness of exterior insulation layer,thickness of roof insulation layer and heat transfer coefficient of exterior window is fitted by formula.In order to achieve the maximum energy saving effect,the thickness of external wall insulation layer,roof insulation layer and the type of external window were designed by orthogonal experiment.Using static investment payback period to evaluate the economy of each scheme,the best combination scheme of enclosure structure is obtained : The external wall is selected as 30 mm XPS external insulation,the roof is selected as 30 mm PU inverted insulation,and the external window is selected as Low-e membrane hollow(high permeability)window.The static investment recovery period of this scheme is 4.75 years,and the energy saving rate is 45 %.Finally,in order to verify the feasibility of this optimal scheme,whether condensation occurs in the external wall which is prone to condensation is judged.The calculation results show that on each tectonic interface,the actual water vapor pressure is smaller than the saturated water vapor pressure,and the actual water vapor pressure line and the saturated water vapor pressure line basically do not intersect.So there will be no condensation inside this enclosure structure.The research results have a good guiding significance for the energy saving design of rural residential buildings in hot summer and cold winter areas.Figure[30]Table[21]Reference[78]...