Solve Problem 15.7 if all specified
conditions remain the same but radiant energy exchange from glass to the
surroundings at the air temperature is also considered.
Plate glass, , initially at 850
K, is cooled by blowing air past both surfaces with an effective surface
coefficient of 5 W/m2 K: It is necessary, in order that the glass
does not crack, to limit the maximum temperature gradient in the glass to 15
K/mm during the cooling process. At the start of the cooling process, what is
the lowest temperature of the cooling air that can be used?
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