Home Up Contact Us


Job Hotline
Engineering Dictionary
Fireman Exams
Q & A Steam Turbines
Engineering Exams
Test YourSelf
Learning Center
Energy Tips
Steam Turbines
Free Energy Stuff
Trade Books
Trade Links
Local Vendors


Isentropic Efficiency of a Steam Condensing Turbine




The Isentropic efficiency of a turbine is a comparison of the actual power output with the Isentropic case. Typical Isentropic efficiencies range from 70-90%.

ttur1.gif (588bytes)


tuequa.gif (1519bytes)


To calculate these enthalpy changes, you need to know the initial and final states, for example, temperature and pressure, of the working fluid for both the actual and isentropic cases. In the isentropic case, h2s is found from P2 and (S1 = S2s).

A typical Ts diagram for a steam turbine is shown below. turbin.gif (6k)


REFERENCES : Jones, J. B., & R. E. Dugan. Engineering Thermodynamics.