Pump Efficiency

The pump efficiency can be evaluated using following efficiency formula:

(6.3)

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:

(6.4)

Subscript in means averaged quantities at the inlet, whereas subscript out denotes averaged quantities at the outlet. The evaluation of pump efficiency for different patches is also possible.