Answer to Question #165687 in Mechanical Engineering for Utkarsh Pandey

Question

A Refrigerator produces a refrigerating effect ( i.e heat removed ) of 8.5MJ/min. If the 

COP of the refrigeration system is 3. Determine the power required to run the compressor.

Answer 1

COP = Refrigerating effect / work input

3 = 8.5 x 10⁶ J/min / work input

Work input = 8.5 x 10⁶ J/min / 3 = 2.83 x 10⁶ J/min

Power required = Work input/min / 60 = 2.83 x 10⁶ / 60 = 4.72 x 10⁴ W = 47.2 kW3