Tailored Review on the Research in the Electric-Energy Efficiency of Transport Processes (Part 1): Bulk Materials and Fluids

The adequate evaluation of the energy efficiency is an existing problem that needs to be solved. In this article, a new comparative study is presented covering published developments in a defined area of transportation processes provided with electrical energy. The methodology of this research consists of three stages: review of the existing developments; analysis on the used energy efficiency indicators; formulation of recommendations for improving these indicators. A widely accepted and universal indicator for evaluating energy efficiency has been identified, namely the total electrical energy consumed. A relatively common indicator is the efficiency coefficient indicator. It is characterized by the advantage of separating the useful and non-useful part of the energy, but the research done shows that it is limited, mainly for micro-climatic pump systems and oil wells, and less often for water supply systems. The application of this indicator should be expanded by developing generalized determination methods for a wide range of transportation processes provided with electrical energy.