Emergy Study On Life Cycle Of Civil Reinforced Concrete Building In China

The sustainability assessment of buildings is one of the primary topics in the field of architecture.It is a major challenge to consider the sustainability of buildings comprehensively.Traditional evaluation methods have different emphases and can’t comprehensively evaluate the sustainability of buildings,such as effective energy method,energy consumption analysis method and carbon emission method.In contrast,emergy theory is a synthetic assessment method in the field of ecology,which can realize quantitative calculation and sustainability assessment,including energy,resources,economy,emissions,labor and transportation for buildings.Based on evaluation completeness,emergy method is superior to the traditional method.Therefore,applies emergy theory was used in the field of building sustainability for the in-depth discussion.The cross study of ecological theory and architecture is a hot topic at present,but it is difficult to utilize the emergy method to the architectural field so as to realize the deep their combination.In order to achieve this goal,the theoretical perfection and innovation of emergy method should be considered carefully in the field of architecture.Taking reinforced concrete buildings as the study object and the localized emergy theory as the basic framework,it focuses on the differences of building sustainability assessment on the basis of the transformity in China,in order to feedback,supplement and improve the theoretical combination and practical application.Firstly,the study summarizes the progress on the intersection of emergy theory and architecture at home and abroad,compares and analyzes the current development situation,and summarizes the key influencing factor--the localization of transformity.In order to solve the core contradiction,the localization transformity exploration of seven types was carried out,which promoted the in-depth combination of emergy theory and architecture,and realized a more reasonable quantitative sustainability evaluation study of the whole life cycle in China.Secondly,in order to achieve accurate transformity localization in China,based on the quota method as the breakthrough point,seven construction elements were calculated by considering renewable energy sources,nonrenewable resources,purchase,fossil energy,human services,transportation,industry pollution emissions,etc.The transformity calculation results are as follows: cement are 2.56×1012sej/kg(wet material)and 2.46×1012sej/kg(dry material);Steel is 2.29×1015sej/t;Concrete is 7.14×1012sej/kg(40MPa);Glass are1.8×1012sej/kg(raw material)and 1.71×1012sej/kg(chemical composition);Brick is 4.23×1012sej/kg;Ceramic is 4.01×1012sej /kg;Water is 3.40×1012sej/m3.Finally,the sustainability effect of reinforced concrete buildings under localized emergy transformity have been studies in China.Meanwhile,compared with two transformities at home and abroad,the sustainability differences of steel-concrete buildings for office,commercial and residential buildings are analyzed,which verifies the study necessity based on the localized transformity in China.According to environmental load rate,emergy generation rate and emergy sustainability,the error ratios caused by steel-concrete office buildings of first case are 27.2%,43%,67% and 13.55%,16.87%,35.38% for second case,respectively.Commercial steel-concrete buildings of first case were 6.47%,6.18%,9.09%and 19.49%,8.82%,26.09% for second case,respectively.Residential steel-concrete buildings of first case were 9.37%,18.62%,11.01% and 10.23%,25.7%,11.52% for second case,respectively.At the same time,in view of the low sustainable efficiency of the three cases,the corresponding improvement strategies have been put forward.The improvement effect has been analyzed,pointing out the direction for the sustainable improvement of steel concrete building in the future.