Question

1.

A) Argon contained in a closed, rigid tank, initially at 36.3°C, 2.8 bar, and a volume of 1.4 m3, is heated to a final pressure of 9.9 bar. Assuming the ideal gas model with k = 1.53 for the argon, determine the heat transfer, in kJ.

B) Nitrogen (N2) contained in a piston–cylinder arrangement, initially at 6 bar and 435 K, undergoes an expansion to a final temperature of 300 K, during which the pressure–volume relationship is pV1.5 = constant. Assuming the ideal gas model for the N2, determine the heat transfer in kJ/kg.

C) Water vapor contained in a piston–cylinder assembly undergoes an isothermal expansion at 239°C from a pressure of 5.6 bar to a pressure of 3.4 bar. Evaluate the work, in kJ/kg.

D)A piston–cylinder assembly contains air, initially at 2.5 bar, 258 K, and a volume of 4 m3. The air undergoes a process to a state where the pressure is 1 bar, during which the pressure–volume relationship is pV = constant. Assuming ideal gas behavior for the air, determine the mass in kg.

Answer 1