Calculate IAPWS R7-97 steam turbine or steam engine power from temperature, pressure and mass flow rate.
The turbine power is calculated from the change of enthalpy between the inlet and outlet conditions. The enthalpy change is negative for a turbine (postive work). Heat losses from the turbine, phase changes, fluid velocity and elevation are ignored. Check the phase of the inlet and outlet fluid.
The maximum work power corresponds to an isentropic process with delta specific entropy = 0 (isentropic efficiency = 100%). Check that the delta specific entropy is ≥ 0. Negative changes in specific entropy are not thermodynamically valid. The turbine efficiency factor E accounts for the mechanical efficiency of the turbine only. It does not include the isentropic efficiency.
Note : There is an anomaly in the steam calculation for region 3 between the saturated vapour line, the region 2/3 boundary, and the critical pressure. Refer to the region 3 anomaly help page for more details (click the utility button on the data bar). IAPWS R7-97 is intended for industrial use, and is a simplified version of IAPWS R6-95 for scientific use. IAPWS R7-97 was developed as an improvement of the IFC-67 model.
Reference : IAPWS R7-97 Industrial Formulation for thermodynamic Properties of Water and Steam
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