Analysis Of The Potential Of Thermal Performance Of Envelope Structure For Building Energy Saving In Hot Summer And Cold Winter Climate

As my country has built a well-off society in an all-round way and continues to accelerate the construction of public infrastructure,building area and energy consumption continue to increase,and building energy consumption accounts for 35% of the world’s terminal energy consumption.Due to the complexity and diversity of public buildings,the energy intensity per unit area ranks first among all building types.From 2001 to 2018,the energy intensity per unit area increased from 17kgce/m2 to 26kgce/m2.As the part of the building that directly contacts the external environment,the envelope structure is an important factor that affects the heat transfer between indoor and outdoor and thus the energy-saving potential of the building.This paper selects the Chongqing area,a typical city in the hot summer and cold winter area,to explore the building energy-saving potential of the thermal performance of the public building envelope,so as to guide the energy-saving design of public buildings in the hot summer and cold winter area.Through the actual investigation of 90 public buildings in Chongqing area,the basic information of public buildings in Chongqing area,specific methods of envelope structure,and thermal performance level were obtained,and the weak links of current envelope structure and the gap between the energy-saving standards of national buildings and related national buildings were analyzed.,And at the same time provide actual data support for the energy consumption simulation in the following text.Next,a typical office building under actual investigation was selected as the research object.Based on the actual investigation method of the envelope structure,vertical fiber rock wool board was used as the external wall insulation material,and the flame-retardant extruded polystyrene board(XPS)was used as the roof insulation material.,Adopting 9 different structural forms of whole windows as the external window simulation program,constructing a "reference building" that meets the minimum requirements of the thermal performance of the envelope structure in the national public building energy-saving standards,and improving the thermal performance of the envelope structure on this basis,Using Designbuilder software to analyze the impact of the thermal performance of the envelope structure on the building from the two perspectives of energy saving rate and sensitivity coefficient,obtain the energy consumption change trend,energy saving potential and sensitivity coefficient under different thermal parameters,and comprehensively analyze the surrounding The priority order of the energy-saving design of the protective structure is: exterior window> exterior wall> roof.According to the single energy-saving effect of the envelope structure analyzed by the energy consumption simulation analysis,four reasonable levels of the exterior wall,exterior window,and roof are selected,and the energy-saving analysis of the envelope structure combination scheme is carried out through the orthogonal experiment design method,and 16 combinations of the schemes are obtained.Building energy consumption and comprehensive energy saving rate,respectively,obtain the envelope structure combination scheme with the lowest energy consumption for air conditioning in summer,heating energy in winter,and total energy consumption throughout the year.Finally,using the full life cycle cost analysis(LCCA)method,a comprehensive analysis of 16 combination schemes is carried out,and the optimal combination scheme of envelope structure for public buildings in hot summer and cold winter areas is proposed from the two dimensions of energy saving rate and economy.