example 5-1 - Example 5-1 In a toaster oven heat escapes...

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Example 5-1 In a toaster oven, heat escapes through a glass viewing window. The glass pane is 1.5 cm thick, 8 cm high and 12 cm wide. The inside surface of the glass is at 200°C and the air in the room is at 25°C. Heat is transferred by conduction through the glass and natural convection to the air. If the heat transfer coefficient is 4 W/m 2 ·K, find the rate of heat loss through the window. Solution: cond conv Q Q = ± ± ( ) ( ) 1 2 2 3 kA T T hA T T L = ( ) ( ) 1 2 2 3 k T T h T T L = ( ) ( ) ( ) o 2 o 2 2 W 1.4 200 C W m K 4 2 m K 1m 1.5cm 100cm T T =
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