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Unformatted text preview: K . 3. (50) Consider the Rankine cycle below. ind boiler turbine condenser 3 4 1 2 P 3 = 15 MPa T 3 = 400 C P 4 = 10 kPa x 4 = 1 P 1 = 10 kPa x 1 = 0 m = 100 kg/s . cold lake water in warm lake water out, T = 20 C pump P 2 = 15 MPa T 2 = 60 C heat loss from nonadiabatic turbine = 5000 kW (a) the heat transfer rate to the boiler ( kW ), (b) the power output of the turbine ( kW ), (c) the overall thermal eciency, (d) the thermal eciency of a Carnot cycle operating between the same temperature limits, (e) an accurate sketch of the cycle on a Ts diagram, (f) the mass ow rate of external lake cooling water to exchange heat with the condenser if the lake cooling water temperature rise is designed to be 20 C ....
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