Research Of Building Energy System Carbon Emissions Accounting Base On LCA

Buildings energy system as the town’s infrastructure is an important source of building energy consumption and carbon emissions. Along with the promotion of national energy conservation and emissions reduction policy, more and more new and renewable energy technology are used in building field. How the environment impact of these techniques from the perspective of global warming need a reasonable evaluation. The main work of this research including:Firstly, determined the carbon emission calculation method in different stages through the division of carbon source, based on the LCA evaluation theory. And set up the energy consumption and CO2emissions calculation models with the equipment materials production, installation, running maintenance and dismantle disposal phase respectively.Secondly, optimization the main parameters of the model, the selected parameters including the carbon emission factors of energy, the embodied energy and carbon emission factors of equipment composition materials, such as steel, copper, aluminum and plastic, etc,and the carbon emission factors of cargo transportation.Thirdly, established the CO2emissions database of the chiller, water pump, fan coil, heating pipeline, PVC-U feedwater pipe, valves and other equipment production or construction phase, through the analysis of energy and material consumption in equipment manufacturing and installation stage of the main building equipmentFinally, the energy, carbon emissions and economy of2residential building district heating systems and9public buildings heating and cooling systems from dalain are quantitative analysis, the conclusion is as follows:(1) In the life cycle, the energy consumption and carbon emissions will account for86%-94%in running stage, and the embodied energy consumption and carbon emissions will reach6%-14%.(2) B01and B02life cycle carbon emissions were743.60kg/m2,633.03kg/m2, cost respectively were371.58yuan/m2,488.37yuan/m2.B03～B11life cycle carbon emissions were800.15-1296.44kg/m2, the cost were756.60～1121.50yuan/m2.(3) In cold area of china, the heating and cooling system application renewable energy compared with the traditional system, can achieve a certain effect of energy conservation and emissions reduction, but the carbon reduction cost in the life cycle is much higher than carbon tax of china. Main factors of the problem including power energy structure, energy prices and the efficiency of the equipment, improve alone one can reduce the cost, it is hard to recover the investment within the life cycle.(4) The influence factors weight of the carbon reduction cost are power price, equipment efficiency and the carbon emission factor of power. Current,some renewable energy application in the building field in cold area of china, when under the situation of the equipment running efficiency increased by20%, commercial electricity prices reduce20%and10%lower power carbon emission factor, can recover the carbon reduction cost within the life cycle.