Calculation Of Carbon Emission And Economic Analysis Of Building Energy System

Energy is the theme of the international community, and it is also the foundation of the economic and social development of our country. At present, the rapid growth of energy demand and targets of energy saving and emission reduction are not only the pressure of economic development, but also the huge power of carbon emission reduction mechanism and the development of new energy sources. As the major source of building energy consumption, how to evaluate energy consumption,carbon emissions and LCC is important to the development, the scheme selection and operation mode of a building energy system. In this study, we have done the following work to study and to analysis the impact of energy consumption and carbon emission and economy on the social and environmental impact of building energy system:Firstly, based on the LCA and engineering economics, the method of calculating the energy consumption, carbon emission and total life cycle cost of building energy system is optimized. The life cycle is divided into comprehensive production, installation and construction, operation and maintenance and demolition of the disposal of four stages, constructs the building energy system energy consumption and carbon emissions accounting framework; the whole life cycle cost is divided into the initial investment, operation and maintenance costs, the cost of disposal in three parts of the demolition of, construct the economic analysis framework.Then according to the known calculation method and the framework of life cycle cost of each part respectively to establish economic mathematical model analysis, and on building energy system operation maintenance phase of the energy consumption and carbon emissions mathematical model is improved. In model based, the main parameters of optimization selection, determine the efficiency and life expectancy of the building energy system life cycle, the main equipment, carbon emission factor and the discount rate, quantitative analysis of the specific data, on the basis of this, to model the main influencing factors of sensitivity analysis, explore future system development process will appear in the scene mode and corresponding operation mode and strategy.Finally, using established building energy system of carbon emissions and economic analysis model, for building a comprehensive sewage source heat pump system do quantitative calculation and compared with traditional chiller and coal-fired boiler system, analysis of the relationship between the economic benefits and environmental benefits, verified the reliability of the model.The model is based on a reasonable life expectancy, according to our country's energy and economic development,we take 40 years for building energy system contrast analysis, for independent analysis system, such as the sewage source heat pump system, we take 20 years, and cold water+coal-fired units system we take 25 years. For the establishment and analysis of the model, we are known that changes in equipment overhaul and replacement will cause the equipment efficiency, COP changes per 0.2, the operating cost saves about 4.36%, thus affecting the cost of carbon emissions and operation stage; system for external factors, namely energy structure energy price and social discount rate greatly affected the whole life cycle cost and carbon emissions, the electricity price changes per 10%, building energy system and the whole life cycle of the annual cost will increase by 6.85 yuan/m2, building energy system and whole life cycle expenses will increase 93.11 yuan/m2; discount rate increase by 10%, whole life the cycle of annual cost increases year by year, about 1 yuan/m2. Through the comparative analysis of the case, we can know that the sewage source heat pump system can be recovered in 6 years, and has the advantage of long term operation.