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Hydro Turbine Efficiency

The water turbine efficiency can be evaluated using following efficiency formula: img94 2 where $ \eta$ denotes the efficiency, $ M$ is the torque, $ \omega$ is the angular velocity, $ Q$ is the volume flow rate and $ h$ is the specific enthalpy which can be evaluated as follows: img97 2 Subscript in means averaged quantities at the inlet, whereas subscript out denotes averaged quantities at the outlet. The evaluation of turbine efficiency for different patches is also possible.