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A household refrigerator that has a power input of 450 W and a COP of 1.5 is to cool 5 large...

Question:

A household refrigerator that has a power input of 450 W and a COP of 1.5 is to cool 5 large watermelons, 10 kg each, to 8C. If the watermelons are initially at 28{eq}^{\circ} {/eq}C, determine how long it will take for the refrigerator to cool them. The watermelons can be treated as water whose specific heat is {eq}4.2 kJ/kg\cdot^{\circ} C {/eq}. Is your answer realistic or optimistic? Explain{eq}^{\circ} {/eq}

Refrigerator:

The refrigerator is a device that runs through electricity, which replaces the heat from the system by the use of refrigeration cycles. It is used to maintain temperature lower than that of atmospheric temperature. A refrigerator is commonly known as a fridge.

Answer and Explanation:

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Given Data


  • Input power, {eq}{\dot W_{in}} = 450\;{\rm{W}} {/eq}.
  • COP of refrigerator, {eq}CO{P_R} = 1.5 {/eq}.
  • Number of watermelons, {eq}N =...

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