| In 2020,the energy consumption of China’s construction industry will account for33.3% of the total social consumption,becoming the most energy consuming field in China.The existing office buildings have become the most serious subject of energy consumption in public buildings due to the low level of energy conservation stipulated in national standards and specifications,insufficient maintenance measures for building energy conservation,and the designers’ weak awareness of energy conservation.In order to curb the unlimited consumption of energy,energy-saving transformation of existing buildings has become a major problem to be solved in the current society.Shanghai is located in a hot summer and cold winter area.It is extremely hot in summer,cold and humid in winter,and there is no central heating and cooling.In order to ensure an appropriate indoor temperature,the energy consumption of heating and cooling by using a single air conditioner in winter and summer is large.Based on the regional climate characteristics of Shanghai,this paper selects an existing office building in Shanghai as the research object,simulates building energy consumption through PKPM software,discusses the factors affecting building energy consumption,and aims to optimize the technical scheme suitable for energy-saving transformation of existing office buildings in this area.The paper combs the general situation of the existing office buildings in Shanghai,analyzes the different materials and structural characteristics of the enclosure structure,calculates the thermal performance parameters,summarizes the current situation and existing problems of the existing office buildings in the area,and lays a foundation for the subsequent research through field research,technical drawings collection,etc;Build a typical office building model,and use PKPM energy consumption simulation software to simulate and analyze the monthly cooling and heating loads and annual energy consumption of the office building.At the same time,use the control variable method to simulate and compare the energy consumption of single enclosure structure transformation measures,and respectively study 1)exterior wall insulation technology;2)The influence of heat transfer coefficient,air tightness and shading coefficient of external windows on building energy consumption;3)The influence of the thickness of roof insulation materials on building energy consumption;4)The influence of shading form on building energy consumption;5)The influence of lighting system transformation on building energy consumption.The following conclusions are drawn from the systematic analysis of this study: 1)When the external wall is transformed into a single energy-saving project,the internal insulation technology,self insulation blocks and lightweight composite materials should be preferred;2)In the single energy-saving transformation of external windows,strengthening the air tightness has obvious effects on reducing building energy consumption,and reducing the heat transfer coefficient of external windows has extremely obvious effects on reducing the energy consumption of air conditioning and heating in winter.Reducing the shading coefficient of external windows has opposite effects on the unit heating energy consumption in winter and the unit air-conditioning energy consumption in summer of existing office buildings,and has more effects on the reduction of air conditioning energy consumption in summer;3)When the single energy-saving transformation of the roof is carried out,the XPS board inverted insulation roof should be preferred.When the XPS board thickness is about 50 ㎜,the energy-saving effect is good and economic;4)For single energy-saving transformation of sunshade,movable shutter sunshade should be preferred;5)For energy-saving reconstruction of lighting system,300 mm * 300 mm LED light strip is preferred.Figure[45] Table[25] Reference[51]... |
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