Construction Of Ultra-low-energy Residential Buildings In The Western Grassland Of Inner Mongolia Based On Economic Efficiency And Thermal Environment Optimization

In recent years,China's urbanization process has accelerated,and the energy demand for building heating has increased,making China face huge challenges in terms of resources and environment.The grasslands in the western part of Inner Mongolia are located deep in the interior of northern China,in a severely cold area.The local residential buildings are simple in form,with problems such as poor thermal performance of the envelope structure,poor indoor thermal environment quality,high building energy consumption and low clean energy utilization efficiency.With the continuous development of the local economy,in order to increase the indoor temperature,residents generally adopt the method of increasing energy consumption.However,although this method can improve the indoor thermal environment,it will cause an increase in building energy consumption,increased pollutant emissions,and increased environmental pollution,so it is not the optimal solution.Therefore,how to solve the existing problems in residential houses through related technical means is a difficult problem to be solved urgently.This study first sorts out the domestic and foreign research progress on ultra-low-energy buildings,summarizes the ultra-low-energy building theory,and on this basis,selects the appropriate survey area to conduct research to obtain the grassland residential enclosure structure,living status,and energy consumption.Basic data such as other aspects,then select a representative typical residential house,and conduct indoor thermal environment test,in order to explain the problems in the residential house.After that,a typical grassland residential building model is constructed according to the selected typical residential houses,and the thermal environment and energy consumption analysis are carried out,and the foundation for subsequent research is laid.Secondly,several factors affecting the indoor thermal environment of the grassland dwellings in western Inner Mongolia were analyzed,and the influence of each factor on the indoor thermal environment was obtained.Through analysis,the better value of each factor is obtained.Then use the results obtained to build an ultra-low-energy building envelope structure scheme,and perform performance simulation and comprehensive benefit analysis on this scheme.The results show that compared with the typical residential building model,the natural room temperature is increased by 7.85?,7.61?and 7.77?,the energy consumption is reduced by 12 320.47 kW·h,the annual incremental cost is 1 599.6 yuan,and the annual incremental benefit is 2 969.99 yuan.After that,the heating system of the ultra-low-energy grassland dwellings was configured,and on the basis of the above envelope structure scheme,the theoretical performance and comprehensive benefit calculation of the heating system were performed.Through calculation,the clean energy heating capacity provided by the wind-solar hybrid power generation system during the heating period is 1 968.01 kW·h,the annual incremental cost is 1 787.34 yuan,and the annual incremental benefit is 1 989.85 yuan.The overall cost-effectiveness ratio of the ultra-low energy building is 1.438.Finally,through calculation,the heating required by non-clean energy is 2 295.64 kW·h,and the energy consumption converted into unit area is 29.18 kW·h/(m~2·a),which meets the ultra-low energy building target requirements.The research results of this paper provide an idea for constructing ultra-low-energy buildings in the western grasslands of Inner Mongolia,and improve the research on ultra-low-energy buildings in the western grasslands of Inner Mongolia from the perspective of theory and application,and provide assistance for the development of local building energy efficiency.