Test1_Problem_solving_Summer2012.pdf

# Test1_Problem_solving_Summer2012.pdf

• Test Prep
• 1

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Problem solving (70 points) 1. Consider an ideal gas which undergoes the following sequence of mechanically reversible processes in a closed system: Step 1 to 2: Pressure decreases from 10 bar to 3 bar isothermally at 600 K. Step 2 to 3: Pressure decreases at constant volume to 2 bar. Step 3 to 4: Volume decreases at constant pressure. Step 4 to 1: Gas returns adiabatically to initial state, from T 4 = 378.83 K to T 1 =600 K. Calculate Q, W, U and H for steps 2-3 and 3-4. Additional information for problem 1 : C V =(5/2) R R =8.314 J.mol -1 .K -1 2. Refrigerant-134a is throttled in a pipe from 1200 kPa and 40 ºC to 200 kPa. Heat is lost from the refrigerant in the amount of 0.75 kJ/kg to the surroundings at 25ºC. Determine the entropy generation during this process.
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• Winter '15
• Thermodynamics, Pitzer, Molecular weight of refrigerant-134a

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