You are working as an appliance salesperson during the summer. One day, your phy

Question

You are working as an appliance salesperson during the summer. One day, your physics professor comes into your store to buy a new refrigerator. Wanting to buy the most efficient refrigerator possible, she asks you about the efficiencies of the available models. She decides to return the next day to buy the most efficient refrigerator. To make the sale, you need to provide her with the following estimates. (Assume that the temperature on the inside of the refrigerator is 0° C and the room temperature to be 19° C.)

(a) the highest COP possible for a household refrigerator

_____

(b) the highest rate possible for the heat to be released by the interior of the refrigerator if the refrigerator uses 628 W of electrical power.
______kW

Explanation / Answer

(a)Highest posible Co-effieicient Of Performance,

C.O.P = Tc/(Th-Tc) =(0+273)/(19-0) =14.37

(b)C.O.P = Qc/W

W =628 W (given)

Qc=628*14.37 =9024 W =9.024 kW (Heat released by interior of refrigerator)

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