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problem1) Given and Compute:

a) R-134a at T = 60°C and v = 0.072 m3/kg. Compute P and h.

b) Ammonia at P = 8 bar and v = 0.005 m3/kg. Compute T and u.

c) R-22 at T = -10°C and u = 200 kJ/kg. Compute P and v.

problem2) Given: R-134a is compressed with no heat transfer in piston-cylinder assembly from 30 lbf/in2, 20oF to 160 lbf/in2. Mass of refrigerant is 0.04 lbm. For refrigerant as system, W = -0.56 Btu. Kinetic and potential energy changes might be neglected.

Compute: final temperature (°F).

problem3) Given: Saturated water vapor is contained in the closed rigid tank. The water is cooled to a temperature of 110°C. At this temperature masses of saturated vapor and liquid are each 1000 kg.

Compute: The heat transfer for the process (kJ).

problem4) Given: 0.5 kg of R-22 is contained in the piston-cylinder assembly, initially saturated vapor at 5 bar. Refrigerant undergoes the  process for which pressure-specific volume relationship is Pv = C to the final pressure of 20 bar. Kinetic and potential energy effects could be neglected.

Compute:

a) Work (kJ) and

b) heat transfer (kJ) for the process.

problem5) Given: A gallon of milk at 68°F is placed in a refrigerator. Energy is removed from milk at a constant rate of 0.08 Btu/s a the milk cools. Specific heat, cp,milk = 0.94 Btu/lbmoR and density, rmilk = 64 lbm/ft3.

Compute: How many minutes would it take for the milk to cool to 48°F? How many minutes to cool another 10°F to 38°F?

Mechanical Engineering, Engineering

  • Category:- Mechanical Engineering
  • Reference No.:- M93958

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