SHEET (4)

1- Complete the following property table for HzO. Also locate the states on

a I;s diagram (qualitativelY).

i 100 .2O0'i

2- For H2O, locate (qualitatively) the following states on a T-s and a p-v

diagram, Siate-1: P=100 kPa, t=500C; State-2: p=5 kPa, T=500C; State-

3: p=5gg kPa, x=50o/o.

3- For H2O, locate (qualitatively) the following states on a I-s and a p-vdiagram. Siate-1: p=10 kPa, saturated liquid; State-2: p=1 MPa, h=hriState-3: e=gz, T=5000C; State-4: P=?t, saturated vapor'

4- A sealed rigid tank contains saturated steam at 100 kPa. As the tankcools down to the temperature of the surrounding atmosphere, the qualityof the steam drops to 5olo. Using a I-s diagram, explain why the pressure

in the tank must decrease drastically to satisfy thermodynamiceq uilibrium.

5- A tank contains 1 L of saturated liquid and 99 L of saturated vapor ofwaterat 200 kPa. Determine the (a) mass (b) quality and (c) storedenergy of the steam.

6- A tank contains 20 kg of water at B5oC. If half of it (by mass) is in the

liquid phase and the rest in vapor phase, determine (a) the volumetricquality, and the stored energy in the (b) liquid and (c) vapor phases,

V- In orderto test the applicability of the ideal gas equation of state tocalculate the density of saturated steam, compare the specific volume ofsaturated steam obtained from the steam table with the prediction from theideal gas equation for the following conditions: (a) 50 kPa (b) 500 kPa and(c) critical point. Express the comparisons as percentage errors/ using thesteam table results as benchmarks.

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