8.20 water is the working fluid in an ideal rankine cycle with reheat. superheated vapor enters the turbine at 10 mpa, 320°c, and the condenser pressure is 8 kpa. steam expands through the first-stage turbine to 1 mpa and then is reheated to 320°c. determine for the cycle a. the heat addition, in kj per kg of steam entering the first-stage turbine. b. the thermal efficiency. c. the heat transfer from the working fluid passing through the condenser to the cooling water, in kj per kg of steam entering the first-stage turbine.

Agas contained within a piston-cylinder assembly e end nation about same energy states, 1 and 2, where pi 10 bar, v undergoes two processes, a and b, between the sam 0.1 m3, ui-400 kj and p2 1 bar, v2 1.0 m2, u2 200 kj: process a: process from 1 to 2 during which the pressure- volume relation is pv constant process b: constant-volume process from state 1 to a pressure of 2 bar, followed by a linear pressure-volume process to +20 0 state 2 kinetic and potential energy effects can be ignored. for each of the processes a and b, (a) sketch the process on p-v coordinates, (b) evaluate the work, in kj, and (c) evaluate process the heat transfer, in kj