Water is contained in a closed, rigid 0.2 m 3 tank at an initial pressure of 5 bar and a quality of 50%. Heat transfer occurs until the tank contains only saturated vapor. Determine the final mass of vapor in the tank, in kg, and the final pressure, in bar.

Question

Howard Chang

Physics

30 June, 13:16

Water is contained in a closed, rigid 0.2 m 3 tank at an initial pressure of 5 bar and a quality of 50%. Heat transfer occurs until the tank contains only saturated vapor. Determine the final mass of vapor in the tank, in kg, and the final pressure, in bar.

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Answers (1)

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Andy Mays · Answer 1

Final mass=0.89kg

Final pressure=5.6bar

Explanation:

To find mass, m=v/v1

But v1=vf + x (vg-vf)

Vf = 0.001093m^3/kg

Vg = 0.3748m^3/kg

V1 = 0.001093+0.5 (0.3748-0.001093)

V1 = 0.225m^3/kg

M = 0.20/0.225 = 0.89kg

Final pressure will be:

V/V1 = P/P1

Cross multiply

VP1=V1P

P1 = 0.225*5/0.2

P1=:5.6 bar