The air conditioning (A/C) unit of a car is operating on a summer day when the
The air conditioning (A/C) unit of a car is operating on a summer day when the temperature is
30°C. It cools the air to 6°C using 2.5 kW of power output. The A/C has a COP of 3. Find the mass
flow rate of the cold air that the A/C unit can provide on that particular day.
(b) A building freezer that is used to freeze vegetables requires 30 tons of refrigeration to keep the
food frozen. The temperature of the freezer is -35°C and the ambient temperature outside the
building is 30°C. If the performance of the freezer is 25% of the theoretical best possible cycle,
what is the power required to run the freezer. 1 ton of refrigeration is equivalent to 210 kJ/min.
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