Q2. In a regenerative steam power plant, steam enters the turbine at a pressure of 40 bar and a temperature of 480°C. It expands to 0.12 bar and a dryness fraction of 0.92. Some steam is bled from the turbine at a pressure of 2.5 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.
(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.
(c) Determine, with the aid of the worksheet, the thermal efficiency of the cycle. The work required to drive the feed pump may be disregarded.
(d) Determine the isentropic efficiency of the turbine.
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