Cost Increment Analysis Of The Fourth Step Energy Saving Standard For Residential Buildings In Cold C District

In order to effectively reduce the energy consumption of residential buildings in27 counties and cities in the severe cold C region of Xinjiang,comprehensively promote the orderly development of "coal to gas" work,speed up the pace of air pollution control in Xinjiang,improve the energy-saving design level of new residential buildings in the severe cold C region of Xinjiang,and improve the indoor thermal environment of residential buildings,the Housing and Urban and Rural Construction Department of Xinjiang Uygur Autonomous Region has continuously improved the building energy-saving standards,in April 2014.The fourth energy-saving standard,Energy-saving Design Standard for Residential Buildings in Cold C Zone(XJJ/T063-2014),was promulgated and implemented on July 14(hereinafter referred to as the fourth energy-saving standard).It has been nearly five years since the implementation of the fourth step standard,but there is no specific analysis on the cost increment of the fourth step energy saving standard at this stage.Through analysis and demonstration,this paper hopes to get the situation of incremental cost,energy saving and emission reduction and comprehensive economy compared with the implementation of the second step energy saving standard,so as to provide a better application of the fourth step energy saving standard in residential construction practice in cold C district.Certain technical support.By consulting literature,investigating market prices,consulting relevant experts,comparative analysis and demonstration,this paper analyses the reasons for the incremental cost change of each part of the envelope structure under the requirements of two-step energy-saving standard thermal design index and the incremental cost resulting therefrom,and obtains the changes of the incremental cost of the envelope structure under the requirements of two-step energy-saving standard,and also gives the periphery of each part.Sensitivity analysis of incremental cost of protective structure is carried out and corresponding conclusions are drawn.By analyzing the combustion of standard coal,the emission of carbon dioxide,sulfur dioxide,nitrogen oxides and other greenhouse gases in the two-step energy-saving standard under thecorresponding heat consumption index limit requirements,the energy-saving and emission reduction situation under the two-step energy-saving standard requirements was calculated.Taking a residential building in Urumqi as an example,this paper uses the theory of value engineering to analyze and implement the optimal scheme of two-step energy-saving design standard,and calculates its static investment payback period and dynamic investment payback period,so as to provide a basis for better implementation of building energy-saving design standard for residential buildings in cold C district.Through the analysis of this paper,it can be concluded that under the requirements of two-step energy-saving design standard,the incremental cost of the external envelope structure increases with the decrease of heat consumption index.Through sensitivity analysis,it is concluded that the incremental cost of the external window has the greatest impact on the incremental cost of the external envelope structure,while the incremental cost of the external insulation material on the surrounding ground has the least impact on the incremental cost of the external envelope structure.The lower the building heat consumption index,the greater the reduction of standard coal combustion and the greater the reduction of greenhouse gas emissions.Based on the theory of value engineering,the method of calculating dynamic and static payback periods of investment,it is concluded that it is feasible to implement the fourth step energy-saving design standard scheme in residential buildings in Urumqi.