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A refrigerator is thermally equivalent to a box of corkboard 90mm thick and 6m2 in inner surface area, the thermal conductivity of cork being 0.05 W/mK, the motor of the refrigerator runs 15% of the time while the door is closed. The inside wall of the door, when it is closed, is kept, on an average, 22∘C below the temperature of the outside wall. The rate at which heat is taken from the interior wall while the motor is running is |
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Answer» A refrigerator is thermally equivalent to a box of corkboard 90mm thick and 6m2 in inner surface area, the thermal conductivity of cork being 0.05 W/mK, the motor of the refrigerator runs 15% of the time while the door is closed. The inside wall of the door, when it is closed, is kept, on an average, 22∘C below the temperature of the outside wall. The rate at which heat is taken from the interior wall while the motor is running is |
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