Research On Energy-saving Renovation Of Existing Building Combinations In Rural Areas Of Southwest China

With the acceleration of globalization,the world energy situation is becoming increasingly tense.China’s building energy consumption accounts for about 46.5% of the country’s total energy consumption,and China’s buildings have the characteristics of large inventory and high energy consumption.In response to the characteristics of Chinese architecture,the country has achieved certain results in energy-saving renovation of existing buildings,but the renovation of buildings is mainly concentrated in cities.With the improvement of rural consumption level,the proportion of building energy consumption in rural areas is increasing day by day,so energy-saving renovation of existing buildings in rural areas is urgent.This article focuses on the characteristics of rural areas in southwestern China,taking a rural house in Nanchong,Sichuan as an example,to study the impact of three main energy-saving transformation forms,passive,active,and adding clean energy,as well as their combined energy-saving transformation on building energy consumption.The optimal combination plan is given by combining the full life cycle cost evaluation model and the dynamic investment return period model.Firstly,This article compares and analyzes common energy consumption simulation software at home and abroad,summarizes the characteristics of each energy consumption simulation software,and selects Energy Plus as the basic software for this study.Then,through experiments and theoretical calculations,the actual heat transfer coefficient of the original building envelope structure is calculated,and brought into the software for simulation.The original building energy consumption is obtained,which is checked against the actual energy consumption.The error rate is 8.547%,controlled within 10%,which proves that the model is effective.Secondly,the three main energy-saving transformation forms of passive,active,and adding clean energy are combined into seven energy-saving transformation schemes.By comparing and analyzing the seven energy-saving transformation schemes mentioned above,it is found that the energy saving rate and total benefits of the scheme including the addition of clean energy are much higher than those of the scheme without the addition of clean energy,and the cost is lower throughout the life cycle.Therefore,in the transformation process,priority should be given to using transformation schemes that add clean energy;In a combined energy-saving renovation scheme that includes the addition of clean energy,when the installed capacity of the solar photovoltaic system is fixed,other additional renovation costs will affect the total life cycle cost of the building.Specifically,the higher the total cost of additional renovation,the higher the total life cycle cost,and the lower the total benefit.Finally,among the combined schemes,the lighting system+solar photovoltaic system transformation is the best scheme in this study,with a minimum life cycle cost of110769.85 yuan,a dynamic payback period of 12.01 years,and a maximum total benefit of 70390.45 yuan.Therefore,based on the above analysis,combined with energy efficiency and economic considerations,the energy-saving renovation plan for existing buildings in the place of Chinese rural southwest should give priority to the lighting system+solar photovoltaic system renovation.Figure[31] Table[39] reference[104]...