Problem 4: 1
A simple Rankine cycle using water as the working fluid operates
between the pressure limits of 7.5 kPa and 1800 kPa. Determine:

(a)  thermal efficiency = 30.7% 
(b)  steam rate = 4.46 kg/kWh 
Problem 4: 2
A reheat Rankine cycle using water as the working fluid operates
between the pressure limits of 7.5 kPa and 17.0 MPa. Steam is
superheated to 550 ^{o}C before it
is expanded to the reheat pressure of 4.0 MPa. Steam is reheated
to a final temperature of 550 ^{o}C.
Determine:
(a)
the cycle thermal efficiency;
(b)
the steam rate (specific steam consumption);
Answer:
(a)
thermal efficiency = 40.52%
(b)
steam rate = 2.34 kg/kWh
Problem 921
Calculate the thermal efficiency of a simple Rankine cycle for which steam
leaves the boiler as saturated vapor at 3 x 10^{6}
N/m^{2} and is condensed to saturated liquid at
7000 N/m^{2}. The pump and turbine have isentropic
efficiencies of 0.6 and 0.8, respectively. The pump inlet is saturated liquid.
Answer: n_{t}= 26.7%