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FirsrLawProbs - ME 201 Thermodynamics First Law Practice...

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1 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. Refrigerant-134a 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 Refrigerant-134a as saturated vapor at 100 kPa. There is heat transfer to the tank of 66 kJ/kg. Determine the final temperature and pressure.
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