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As the global demand for energy grows, numerous studies in the field of   energy efficiency are stimulated, and one of them is certainly the use of   pumps in turbine operating mode. In order to reduce time necessary to   determine pump characteristic in turbine operating mode problem was studied   by computational fluid dynamics approach. The paper describes various   problems faced during modeling (pump and turbine mode) and the approaches   used to resolve the problems. Since in the majority of applications, the   turbine is a pump running in reverse, many attempts have been made to predict   the turbine performance from the known pump performance, but only for best   efficiency point. This approach does not provide reliable data for the design   of the system with maximum energy efficiency and does not allow the   determination of the head for a wide range of flow rates. This paper presents   an example of centrifugal norm pump operating in both (pump and turbine)   regime and comparison of experimentally obtained results and computational   fluid dynamics simulations. [Projekat Ministarstva nauke Republike Srbije,   br. TR33040: Revitalization of existing and designing new micro and mini   hydropower plants (from 100 to 1000 kW) in the territory of South and   Southeast Serbia

Pumps used as turbines power recovery, energy efficiency, CFD analysis