Research On The Life-cycle Economic Benefit Evaluation Of Energy-saving Residential Building In Dalian Area

In recent years, with the development of our country's total building amount and people's increasing requirement of comfort, building energy consumption has been increased rapidly and accounted for more than 30% in total social energy consumption. It has been reputed "tri-giant" of energy consumption as well as the industrial and transport energy consumption. Due to the current situation and developing trend of building energy consumption in our country, it's an inevitable choice to develop energy-saving building in order to achieve sustainable development and build a resource-saving, environment-friendly society.Energy-saving building in our country is not only urgent but also has great potential, especially the residential building which accounts for more than 60% of total building floor area, is the key field of energy saving. But all the time, people lack the correct concept to recognize energy-saving building and its economic benefit in the view of the life-cycle cost, they don't know how much energy it can save and how much economic benefit it can bring. Because of these, the development of energy-saving building in our country faces great difficulty. It is essential to carry out the study of energy-saving building's life-cycle economic benefit evaluation. This paper mainly selects a typical energy-saving residential building in Dalian area and does some research as follows:Firstly, this article introduces the meanings, composition, characteristics and analytic time of energy-saving house's life-cycle cost. A dynamic and opening life-cycle cost estimation model is established, then breakdown and code the life-cycle cost of energy-saving building.Secondly, by introducing the idea of life cycle cost analysis and the method of cash flow analysis, this article sets up the calculation model of energy-saving house's life-cycle economic evaluating index. By applying the DeST-h energy consumption simulation software to imitate energy-saving house and non energy-saving house's energy consumption, we can calculate these economical index including: annual energy-saving benefit, increment net present value, investment recovery period, life cycle cost , etc, then conduct sensitivity analysis on them.Thirdly, through the comparison of two current appraisal index systems, the viewpoint of using capability appraisal index is put forward. Aimed at this system's defects, detail solving methods are put forward. Furthermore, based on the method of entropy proportion, the best selecting model of appraisal decision is established and does well in practice. Finally, this article compares the life-cycle cost of energy-saving house with non energy-saving house by studying a case of Dalian area. The results show that: the energy-saving house has good economic benefit, and applying the multi-goal method based on entropy proportion in choosing the energy-saving design can unify the energy-saving and economic.