Question

1. A feedwater heater operating at steady state has two inlets and one exit. At inlet 1, water vapor enters at p1 = 7 bar, T1 = 200oC with a mass flow rate of 40 kg/s. At inlet 2, liquid water at p2 = 7 bar, T2 = 40oC, density = 992.260 kg/m3 enters through an area A2 = 25 cm2. Liquid water at 7 bar with a density of 902.527 kg/m3 exits at exit 3 with a volumetric flow rate of 0.06 m3/s. Draw the diagram and identify the inputs, output, and the system. Write the general form of Conservation of Mass equation, and simplify it for this case.

a) Determine the mass flow rate at inlet 2, in kg/s.

b) Determine the mass flow rate at the exit, in kg/s.

c) Determine the velocity at inlet 2, in m/s.

Answer #1

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at the exit (C°) and the quality of substance at the exit. Ignore
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a
mixing chamber has 2 inlets, first, steam water enters at 12 bar
and 1173.15 K , then, saturated liquid enters at 12 bar and 80
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Determine the power produced by the turbine, in kW, and the rate of
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(a) the mass flow rate of air, in kg/s.
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(c) the inlet and exit velocities, in m/s

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air)/min....

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