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Question: steadystate operating data are shown in the figure below for...

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Steady-state operating data are shown in the figure below for an open feedwater heater where 0.7 kg/s and 45%. Heat transfer from the feedwater heater to its surroundings occurs at an average outer surface temperature of 50°C at a rate of 100 kW. Ignore the effects of motion and gravity and let T0 = 25°C, p0 = 1 bar.

n12 2- 1 bar T2 400°C V8 1 bar Ti-40°C i3,23 P3-1 bar Feedwater heater

Determine:

(a) the ratio of the incoming mass flow rates, m˙1/m˙2.

(b) the rate of exergy destruction, in kW

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