4-12 Astack of common building brick 1 m high, 3 m long, and 0.5 m thick leaves an oven, where it has been heated to a uniform temperature of 300°C. The stack is allowed to cool in a room at 35°C with an air-convection coefficient of 15 W/m² . °C. The bottom surface of the brick is on an insulated stand. How much heat will have been lost when the bricks cool to room temperature? How long will it take to lose half this amount, and what will the temperature at the geometric center of the stack be at this time?

Elements Of Electromagnetics
7th Edition
ISBN:9780190698614
Author:Sadiku, Matthew N. O.
Publisher:Sadiku, Matthew N. O.
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4-12 Astack of common building brick 1 m high, 3 m long, and 0.5 m thick leaves an oven,
where it has been heated to a uniform temperature of 300°C. The stack is allowed
to cool in a room at 35°C with an air-convection coefficient of 15 W/m2.°C. The
bottom surface of the brick is on an insulated stand. How much heat will have been
lost when the bricks cool to room temperature? How long will it take to lose half
this amount, and what will the temperature at the geometric center of the stack be
at this time?
Transcribed Image Text:4-12 Astack of common building brick 1 m high, 3 m long, and 0.5 m thick leaves an oven, where it has been heated to a uniform temperature of 300°C. The stack is allowed to cool in a room at 35°C with an air-convection coefficient of 15 W/m2.°C. The bottom surface of the brick is on an insulated stand. How much heat will have been lost when the bricks cool to room temperature? How long will it take to lose half this amount, and what will the temperature at the geometric center of the stack be at this time?
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