8.

5.46 Two kilograms of water execute a Carnot power cycle.

During the isothermal expansion, the water is heated until it is

a saturated vapor from an initial state where the pressure is 40

bar and the quality is 15%. The vapor then expands adiabati-

cally to a pressure of 1.5 bar while doing 491.5 kJ/kg of work.

(a) Sketch the cycle on p-v coordinates.

(b) Evaluate the heat and work for each process, in kJ.

(c) Evaluate the thermal efficiency.