3. A refrigerator with a power of 450W and a COP of 1.5 is used to cool 5 watermelons of 11kg each at 8°C. If the watermelons are initially at 28°C, determine how long it will take the refrigerator to chill them. Watermelons can be treated like water with a specific heat of 4.2kJ/kg°C. Discuss whether your answer is realistic or optimistic. Hint: Use the temperature difference of the watermelons and the heating value to determine the energy required to remove them in KJ.

Elements Of Electromagnetics
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Author:Sadiku, Matthew N. O.
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3. A refrigerator with a power of 450W and a COP of 1.5 is used to cool 5 watermelons of 11kg each at 8°C. If the watermelons are initially at 28°C, determine how long it will take the refrigerator to chill them. Watermelons can be treated like water with a specific heat of 4.2kJ/kg°C. Discuss whether your answer is realistic or optimistic.

Hint: Use the temperature difference of the watermelons and the heating value to determine the energy required to remove them in KJ.

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