Question

Consider a steam turbine power plant operating near critical pressure, As a first approximation, it may be assumed that the turbine and the pump processes are reversible and adiabatic. Neglecting any changes in kinetic and potential energies, calculate

a.  The specific turbine work output and the turbine exit state

b.  The pump work input and enthalpy at the pump exit state

c.  The thermal efficiency of the cycle

Answer 1

P₁ = P₄ = 20 MPa

T₁ = 700 °C 

P₂ = P3 = 20 kPa 

T₃ = 40 °C 

(a) State 1: (P, T)   h₁ = 3809.1 kJ/kg, s₁ = 6.7993 kJ/kg K

C.V. Turbine.