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The paper presents firstly an overview of various definitions/concepts of energy efficiency and their related applications in different contexts, especially in industrial sectors. Each definition/concept is analyzed and recommended for different decision-making levels. Then a multi-level approach is described in detail for evaluating energy efficiency indicator of an industrial process. The evolution of this indicator with regards to system degradation is studied leading to propose a novel concept named remaining energy-efficient lifetime (REEL). In addition, the paper discusses potential prognostic approaches in order to forecast energy efficiency indicator for calculating this REEL by underlining also difficulties and opportunities to implement such approaches. Finally, a case study on TELMA e-maintenance platform is introduced to illustrate energy efficiency concepts and the added value of the prognostics to predict energy efficiency evolution and REEL.
energy efficiency, maintenance, prognostic, decision indicators, multi-component system
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