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Unformatted text preview: pistoncylinder device from
100 kPa and 17°C to 800 kPa in a reversible, adiabatic process.
Determine the final temperature and the work done during this
process, assuming (a) constant specific heats and (b) variable
specific heats for air.
Answers: (a) 525.3 K, 171.1 kJ/kg; (b) 522.4 K, 169.3 kJ/kg 7–71 Reconsider Prob. 7–70. Using EES (or other)
software, evaluate and plot the work done and final temperature during the compression process as functions of
the final pressure for the two cases as the final pressure varies
from 100 kPa to 800 kPa.
7–72 Helium gas is compressed from 90 kPa and 30°C to
450 kPa in a reversible, adiabatic process. Determine the final
temperature and the work done, assuming the process takes
place (a) in a pistoncylinder device and (b) in a steadyflow
compressor. 7–75E Air enters an adiabatic nozzle at 60 psia, 540°F, and
200 ft/s and exits at 12 psia. Assuming air to be an ideal gas
with variable specific heats and disregarding any irreversibilities, determine the exit velocity of the air.
7–76 Air enters a...
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 Spring '09

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