Research on comprehensive evaluation model of energy efficiency for fossil power plants

Integrated energy efficiency evaluation is conducted for 17 fossil power units with the capacity of 1000 MW. The integrated energy efficiency is calculated based on three sub-indicators, namely coal consumption per unit power generated, service power rate, and comprehensive water consumption rate. Firstly, weights for the three sub-indicators are assigned based on subjectively Analytic Hierarchy Process (AHP) and objectively Entropy-Weighting Method. Secondly, Extensive Mater-Element Model and Technique for Order Preference by Similarity to an Ideal Solution (TOPSIS) are employed to judge energy efficiency grades and rank energy efficiency for the power units. For representative power units, evaluation results of these two methods agree with theoretically analysis result. More comprehensive evaluation results can be obtained if we combined the Extensive Matter-Element Model and the TOPSIS.