Problem # p012

Actual vs. reversible Refrigerator Cycle

At steady state, a refrigerator whose coefficient of performance is 2.5 ( = heat removed from cold reservoir divided by work needed ) removes heat from its freezer compartment at 0oC at a rate of 6000 kJ/h and discharges heat to the surrounding at 20o.

Please answer the following questions :

  1. Determine the actual power input to the refrigerator.
  2. Determine the necessary power inpout if you could operate a reversible refrigerator cycle between the same temperatures and removing again 6000 kJ/h from the freezer compartment.