# 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.

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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 =...

Types of Heating & Cooling Systems

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Chapter 10 / Lesson 9
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You can choose from a number of different heating and cooling systems to make your home comfortable to live in. Watch this video to learn about the advantages and disadvantages of forced air, radiant heat, baseboard heat and geothermal systems.