Question

The formation of frost on cooling coils in a refrigerator:

• A. improves C.O.P. of the system
• B. increases power consumption
• C. reduces power consumption
• D. increases heat transfer

Answer 1

The correct option is B increases power consumption

The effect of frost formation on the performance evaporator coils typically found in domestic refrigerator-freezers. The effect of fin spacing on evaporator performance was also studied. The study was carried out by setting the conditions of air inlet temperature, air inlet relative humidity, and refrigerant inlet temperature, and by varying the volumetric airflow rate over a wide range to study its effect on the evaporator overall heat transfer coefficient and the evaporator pressure drop. These values were monitored while frost accumulated on the evaporator over a ten hour period. The data was modeled using a least-squares curve fit where the heat transfer coefficient and the pressure drop were taken to be functions of the airflow rate and the mass of accumulated frost

The formation of frost on cooling coils in a refrigerator increases power consumption