Question

A freezer has a coefficient of performance of 2.40. The freezer is to convert 1.80 kg of water at

25.0°C to 1.80 kg of ice at -5.0°C in one hour. (a) What amount of heat must be removed from the

water at 25.0°C to convert it to ice at -5.0°C (b) How much electrical energy is consumed by the

freezer during this hour? (c) How much wasted heat is delivered to the room in which the freezer

sits?

Answer 1

a)

$E=2.1~MJ,$

b)

$W=4.2~MJ,$

c)

$E_1=1.1~MJ.$