Question

In a steam power plant operating on an ideal Rankine cycle, superheated steam enters the turbine at 3 MPa and 350⁰C. The condenser pressure is 75 kPa. The thermal efficiency of the cycle is __________ percent.

Given data:

For saturated liquid, at P = 75 kPa,

$h_{f}=384.39KJ/Kg,v_{f}=0.001037m^{3}/kgs_{f}=1.213KJ/Kg-kat 75kPa,h_{fg}=2278.6KJ/kgs_{fg}=6.243KJ/kg-k$

At P = 3 MPa and

T = 350⁰C

h = 3115.3 kJ/kg, s = 6.7428 kJ/kg-K