The black grille on the back of a refrigerator has a surface temperature of 35C with a total surface area of 1 m2. Heat transfer

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The black grille on the back of a refrigerator has a surface temperature of 35°C with a total surface area of 1 m2. Heat transfer to the room air at 20°C takes place with an average convective heat transfer coefficient of 15 W/m2 K. How much energy can be removed during 15 minutes of operation?

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