Benefit evaluation of building energy-saving renovation projects based on BWM weighting method

Abstract The energy-saving renovation (ESR) of existing residential buildings is regarded as a pivotal strategy to reduce energy consumption and achieve energy-saving and emission-reduction goals. However, there are many difficulties in implementing these ESR projects in practice. In order to address these issues, this study is on the foundation of the characteristics of existing residential building ESR. Through in-depth analysis of functional and cost indicators for evaluating the benefits of ESR, combined with expert research and statistical analysis, a ESR benefit indicator system consisting of two subsystems: function and cost has been constructed. The study selects the best worst-case method with high reliability and simple calculation to determine the weights of various indicators and adopts a fuzzy comprehensive evaluation method to achieve quantitative integration of evaluation information. The ESR benefit evaluation model based on value engineering has been applied to the evaluation of an ESR project in Qingdao. The experimental results show that the value coefficient of the evaluation is 0.991, and the weighted evaluation value of renovation cost is 0.219, which is significantly higher than the weighted value of management cost of 0.178. This fully proves the effectiveness and accuracy of the existing evaluation index system for ESR benefits of residential buildings on the foundation of value engineering. These results have a certain value in the construction project benefit evaluation and can serve as technical references.