Q.A Carnot refrigerator operates between 250K and 300K. Calculate its coefficient of performance.

Refrigerators and heat pumps are heat engines run in reverse: rather than converting a flow of heat into useful work, they CONSUME mechanical work in order to force heat to flow 'uphill' — from a colder region to a hotter one — something that never happens spontaneously on its own. This is typically achieved using a refrigerant fluid that is repeatedly forced to evaporate (absorbing heat from the cold region) and condense (releasing that heat to the hot region) by cyclically decreasing and increasing its pressure, via a compressor, expansion valve, and closed refrigerant tubing. …