Study On Incremental Cost And Economy Of Water Saving And Reuse System In Green Building District

With the development of resource economizing social, the building energy conservation is in the ascendant. As the most potential part of building energy conservation, green building is being paid more attention at present. Therefore, it also offered wider development space for the green building's water saving and water reusetechnology which is the one of most important part of green buildings.At present, the obstacle of accepting the green building concept is the fuzzy understanding of the main public to the green building, which will inevitably bring the increased cost by a large of margin in building, operating the green buildings. However, the fact is not actually like this. So, the life cycle assessment in whole life and the comprehensive analysis of economic performance should be put in practice in order to obtain the actual incremental cost which could help to build the new cost-benefit view. So, the basic data was drawn from the water saving and water reuseof 1st phase low energy consumption district demonstration system in Wuhan, which aimed to reaserch the characteristic of cost and calculation index. According to those steps, we try to obtain the data to consult on the investment decision in green building's water saving and water reusetechnology. The main research contents and result are as follows:â‘ Lacking of basic initial cost data, other parallel designs was made to compare the existing design parts of water saving and water reuse technology, which ensures to get the firsthand initial incremental cost data.â‘¡Monte Carlo simulation often used in risk investment and predicts is introduced, which can carry on effective analysis and weakening in uncertainty produced in life cycle. And the cost function and parameter variable system are also set up. On the basis of that, can realize through crystal ball software the whole life cycle cost relevant uncertainty analysis.â‘¢According to the parallel simulation design of traditional building, we carried through budgetary estimate of the system, and obtain the results as followed: green building's water saving and water reuse system will increase overall on the amount of system built, and the incremental cost of building is 3,136,400 Yuan, incremental of construction area is 50.26 Yuan/m2 under the scale of 38,000m2 floor space, 42,000 m2 construction area and 900 residents.â‘£According to the basic data gathered, through predicting models, we obtain the the net present value (NPV) cost in the green building's water saving and water reuse system. As the result, we also obtain that 13.42 year is the incremental cost payback period of investment, and the index of payback period of investment is feasible. The profit mean net present value (NPV) of the increment in life cycle is 4,543,800 Yuan and cost/profit ratio is 1:2.34, which direct economic benefits are remarkable and fesible.At a certain extent, this dissertation research results supplement the basic data of life cycle cost and incremental cost in green building's water saving and water reuse system. And it will be able to offer reference and technical support for the things that water saving and water reuse systems'investment and management in green buildings.