Unformatted text preview: , obtain Eq. 7–43. 120 L 7–58C What are Pr and υr called? Is their use limited to isentropic processes? Explain. FIGURE P7–49
Determine the final equilibrium temperature and the total
entropy change for this process. 7–59C Can the entropy of an ideal gas change during an
isothermal process? 7–50 A 12kg iron block initially at 350°C is quenched in an
insulated tank that contains 100 kg of water at 22°C. Assuming
the water that vaporizes during the process condenses back in
the tank, determine the total entropy change during this
process. 7–60C An ideal gas undergoes a process between two specified temperatures, first at constant pressure and then at constant
volume. For which case will the ideal gas experience a larger
entropy change? Explain. 7–51 A 20kg aluminum block initially at 200°C is brought
into contact with a 20kg block of iron at 100°C in an insulated
enclosure. Determine the final equilibrium temperature and the
total entropy change for this process.
Answers: 168.4°C,...
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 Spring '09
 Thermodynamics, Energy, Entropy, entropy change

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