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Q8. In a regenerative steam power plant, steam enters the turbine at a pressure of 120 bar and a temperature of 520°C. It expands to 0.05 bar with an isentropic efficiency of 80%. Some steam is bled from the turbine at a pressure of 2 bar and supplied to a direct mixing feed heater. There is no undercooling in the condenser, and the feed water leaves the feed heater at the saturation temperature of the bled steam.

(a) Sketch a line diagram of the plant. (3)

(b) On Worksheet Q4, plot the expansion process. To estimate the bled steam condition, it may be assumed that the process line on the h-s chart is straight. (5)

(c) Estimate the thermal efficiency of the cycle. The work required to drive the feed pump may be disregarded. (8)