1. Determine the phase or phases in a system consisting of H2O at the following conditions and sketch p-y and T-y diagrams showing the location of each state.
(a) p 5 80 lbf/in.2, T 5 312.07°F.
(b) p 5 80 lbf/in.2, T 5 400°F.
(c) T 5 400°F, p 5 360 lbf/in.2
(d) T 5 320°F, p 5 70 lbf/in.2
(e) T 5 10°F, p 5 14.7 lbf/in.2
2. Determine the phase or phases in a system consisting of H2O at the following conditions and sketch p-y and T-y diagrams showing the location of each state.
the specific volume at T 5 220°C, p 5 1.4 MPa, in m3/kg.
3. The following table lists temperatures and specific volumes of ammonia vapor at two pressures:
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p 5 50 lbf/in.2
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p 5 60 lbf/in.2
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T(°F)
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y(ft3/lb)
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T(°F)
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y(ft3/lb)
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100
|
6.836
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100
|
5.659
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120
|
7.110
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120
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5.891
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|
140
|
7.380
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140
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6.120
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Data encountered in solving problems often do not fall exactly on the grid of values provided by property tables, and linear interpolation between adjacent table entries becomes necessary.
Using the data provided here, estimate
(a) the specific volume at T 5 120°F, p 5 54 lbf/in.2, in ft3/lb.
(b) the temperature at p 5 60 lbf/in.2, y 5 5.982 ft3/lb, in °F.
(c) the specific volume at T 5 110°F, p 5 58 lbf/in.2, in ft3/lb.