The Comparison of the Value Engineering Method and Hydraulic Method on Water Distribution Systems Performance Evaluation

摘要

Value engineering is an evaluation method to assess the matching degree on performance and its cost of water distribution systems from the point of function achievement characteristics, which had been published from 2006 in some journal. The scientific of Value engineering method had been confirmed by a large number of facts in other applications, but in the evaluation of water distribution systems is still a new topic. The correctness, accuracy of its evaluation results is very crucial taking into account the complexity of water distribution network; therefore, we should use another mature method for checking its correctness and accuracy. Hydraulic evaluation method of water distribution systems was built on the basis of hydraulic calculation; theory is relatively mature, which is one of achiever way of water distribution systems functional assessment. Therefore, it can be used to check the conclusions of value engineering evaluation. In this paper, hydraulic evaluation methods include two contents: first is the overall performance evaluation by using total performance index of water network, which includes selection of state variables associated with different evaluation system, rendering performance curve for the calibration standard service level performance element variation of state variables, select inductive element level performance evaluation function to expand the pipe network by the performance index. Second, component's performance evaluation which is based on the optimization calculation of water distribution systems, and use the hydraulic parameters ad the basic evaluation indicators. Last, pointed out the advantages and disadvantages of the hydraulic evaluation method and value engineering method by compare and analyze their respective results, drew the conclusion that value engineering method is better than hydraulic evaluation method.