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An electric heater is used to heat a room of volume 62m3 . Air is brought into the room at 50 and its completely replaced twice perhour. Heat loss through the walls amounts to approximately 850kcal/h. If the air is to be maintained at 20o C, what minimum wattage must the heater have? (The specific heat of air is about .17 kcal/kg.Co . )

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