The condenser pressure of the turbine in P3.2 is reduced to 0.15 bar. Calculate the same parameters for this cycle as in the previous example. Why have the parameters improved so much? [28.97\%; 32.65\%; \(744.8 \mathrm{~kW} /(\mathrm{kg} / \mathrm{s})]\)

P3.2 

A steam power plant operating on a basic Rankine cycle has the following parameters: maximum (boiler) pressure 20 bar; minimum (condenser) pressure 0.5 bar. Calculate the thermal efficiency of the cycle, and compare it to that of a Carnot cycle operating between the same temperature limits (see P3.1). Calculate the specific power output and the back work ratio (defined as \(\dot{w}_{\mathrm{P}} / \dot{w}_{\mathrm{T}}\) ) for the cycle in this question and that in P3.1. Comment on the results obtained.

(Assume the pump and turbine operate isentropically.)

[24.26\%;27.0\%;598.5 kW/(kg/s); 0.34\%; 14.7\%]