Using the appropriate tables determine the change in...

Using the appropriate tables, determine the change in specific entropy between the specified states, in Btu/lb · °R. (a) water, p1 = 10 lbf/in.2, saturated vapor; p2 = 500 lbf/in.2, T2 = 1000°F. (b) ammonia, p1 = 140 lbf/in.2, T1 = 160°F; T2 = -10°F, h2 = 100 Btu/lb. (c) air as an ideal gas, T1 = 80°F, p1 = 1 atm; T2 = 340°F, p2 = 15 atm. (d) oxygen as an ideal gas, T1 = T2 = 520°R, p1 = 10 atm, p2 = 5 atm.

Employing the ideal gas model, determine the change in specific entropy between the indicated states, in $\mathrm{kJ} / \mathrm{kg} \cdot \mathrm{K}$. Solve three ways: Use the appropriate ideal gas table, $I T$, and a constant specific heat value from Table A-20. (a) air, $p_{1}=100 \mathrm{kPa}, T_{1}=20^{\circ} \mathrm{C}, p_{2}=100 \mathrm{kPa}, T_{2}=$ $100^{\circ} \mathrm{C} .$ (b) air, $p_{1}=1$ bar, $T_{1}=27^{\circ} \mathrm{C}, p_{2}=3$ bar, $T_{2}=377^{\circ} \mathrm{C}$. (c) carbon dioxide, $p_{1}=150 \mathrm{kPa}, T_{1}=30^{\circ} \mathrm{C}, p_{2}=300 \mathrm{kPa}$, $T_{2}=300^{\circ} \mathrm{C}$ (d) carbon monoxide, $T_{1}=300 \mathrm{~K}, v_{1}=1.1 \mathrm{~m}^{3} / \mathrm{kg}, T_{2}=500 \mathrm{~K}$, $v_{2}=0.75 \mathrm{~m}^{3} / \mathrm{kg}$ (e) nitrogen, $p_{1}=2 \mathrm{MPa}, T_{1}=800 \mathrm{~K}, p_{2}=1 \mathrm{MPa}$, $T_{2}=300 \mathrm{~K}$

Fundamentals of Engineering Thermodynamics SI VERSION

Using Entropy

Problems: Developing Engineering Skills

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