Analysis Of Energy Consumption And Life Cycle Assessment Of Environmental Impact Of Air Conditioning Cold And Heat Source

Energy is an important physical basis for human life and social progress and in the mean time energy consumption has become a major source of environmental contamination. In recent years, with the rapid development of our country's economy, the proportion of the building energy consumption and the Heating, Ventilating and Air Conditioning energy consumption in particular is becoming larger and larger, and therefore energy consumption and environment problems are getting worse and worse. Among them, the environmental impact brought by air conditioning cold and heat source has aroused a strong concern among the professionals.This essay tries to make some analysis and comparison over three frequently used plans of air conditioning cold and heat source based on an actual design. First, by using BIN, the annual energy consumpution of the above three plans is analyzed and then computed and compared are the technical and economical indicators of primary energy consumption, utilization rate of primary energy consumption, seasonal performance factor and annual performance factor of the three plans. Comparing annual primary energy consumption of the three plans, a conclusion can be made: the quantity of energy consumption of natural gas direct-fired lithium-bromide absorption chiller/heater is the largetest. The amount of the ASHP(air source heat pump) chiller is litter. The amount of electric screw water chiller plus gas boiler is the least, which has significant impact on saving energy. Comparing PER of the three plans, a conclusion can be made: considering the energy consumption of external system, PER of electric screw water chiller is the highest of the three plans, direct-fired absorption chiller/heater is litter, the ASHP chiller is the least in summer. In winter, PER of the ASHP chiller is the largetest, boiler is litter, direct-fired absorption chiller/heater gas is the least.Then, from the direction of the life cycle of the air conditioning cold and heat source, using 1GWh as a functional unit and a basis of selective plans to measure input and output, a system boundary under simplified and hypothetical conditions and a model frame are built; the environmental impact assessment is made according to environmental impact of the life cycle ofproducts. Environmental exhaust is transformed to environmental load in accordance with the characterized model while normalization and valuation or weighting are also made. A model of life cycle impact assessment is built and the computing process is given so as to describe the environmental impact of the life cycle of products according to their environmental impact load. From the direction of life cycle, an assessment is made on the potential impact of these three plans over the air. A conclusion can be made: natural gas direct-fired lithium-bromide absorption chiller/heater makes the least impact on environment; electric screw water chiller plus gas boiler makes less and the ASHP chiller makes the most.