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Water Turbine Efficiency
The water turbine efficiency can be evaluated using following efficiency formula:
where 
denotes the efficiency, 
is the torque, 
is the angular velocity, 
is the volume flow rate and 
is the specific enthalpy which can be evaluated as follows:
 | (6.2) |
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.