70. An electric heater is used to heat a room of volume 62
Chapter 18, Problem 70(choose chapter or problem)
70. An electric heater is used to heat a room of volume 62 m3. Air is brought into the room at 5CC and is completely-replaced twice per hour. Heat loss through the walls amounts to approximately 850 keal/h. If the air is to be maintained at 20C. what minimum wattage must the heater have? (The specific heat of air is about 0.17 kcal/kg-C.)
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