Question

in a vapor compression cycle of an effective refrigerator, the coefficient of performance: a. is typically much larger than 1. b. does not depend on the ambient (environmental) temperature. c. will show that electrical energy input to the compressor will be much more than the heat absorbed from the refrigerated space. d. can be determined by the ratio of heat rejected from the condenser coils to electrical work input at the compressor.

Answer 1

The correct answer is b. The coefficient of performance (COP) is a measure of the efficiency of cooling appliances. Typically, the COP of a refrigeration cycle is much larger than 1, meaning that the appliance uses less energy to produce a unit of cooling than it would take to produce the same amount of heat. This efficiency is especially true of vapor compression refrigerators, which rely on the phase change of a refrigerant to achieve these results. The COP of a refrigeration cycle is also not dependent on the ambient temperature, as the efficiency comes from the physical process itself.