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ME 201
Thermodynamics
First Law Practice Problems
1. Consider a balloon that has been blown up inside a building and has been allowed
to come to equilibrium with the inside temperature of 25°C and inside pressure of
100 kPa. The diameter of the balloon is measured and found to be 0.13 m. The
balloon is then taken outside and allowed to come to equilibrium with the outside
temperature of 5°C and outside pressure of 100 kPa. Determine the boundary
work, heat transfer, and final balloon diameter.
2. Air at 1800 K and 800 kPa enters an ideal turbine at 2.3 kg/s. The power output
required of this turbine is 700 kW. Determine the exhaust temperature and
pressure.
3. Refrigerant134a as saturated liquid at 32°C enters a valve and exits at 0.16 MPa.
What is the fluid phase at the exit?
4. A tank contains Refrigerant134a as saturated vapor at 100 kPa. There is heat
transfer to the tank of 66 kJ/kg. Determine the final temperature and pressure.
5. Consider a 300 gallon hot water heater which is to provide water a 180°F and 20
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 Spring '06
 SOMERTON

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