Plate glass at 600 °C is cooled by passing air over its surface. To prevent cracking, it is known that the temperature gradient must not exceed 15 °C/mm at any point in the glass during the cooling process. If the thermal conductivity of the glass is 1.4 W/m.K, its surface emissivity is 0.8, the total heat flux is 21000 W/m² and the temperature of the air that can be used for the cooling is 345 °C, what is the convection heat transfer coefficient? Assume that the tempeature of the air equals that the surroundings.
Plate glass at 600 °C is cooled by passing air over its surface. To prevent cracking, it is known that the temperature gradient must not exceed 15 °C/mm at any point in the glass during the cooling process. If the thermal conductivity of the glass is 1.4 W/m.K, its surface emissivity is 0.8, the total heat flux is 21000 W/m² and the temperature of the air that can be used for the cooling is 345 °C, what is the convection heat transfer coefficient? Assume that the tempeature of the air equals that the surroundings.
Elements Of Electromagnetics
7th Edition
ISBN:9780190698614
Author:Sadiku, Matthew N. O.
Publisher:Sadiku, Matthew N. O.
ChapterMA: Math Assessment
Section: Chapter Questions
Problem 1.1MA
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Transcribed Image Text:Plate glass at 600 °C is cooled by passing air over its surface. To prevent
cracking, it is known that the temperature gradient must not exceed 15
°C/mm at any point in the glass during the cooling process. If the thermal
conductivity of the glass is 1.4 W/m.K, its surface emissivity is 0.8, the
total heat flux is 21000 W/m² and the temperature of the air that can be
used for the cooling is 345 °C, what is the convection heat transfer
coefficient? Assume that the tempeature of the air equals that the
surroundings.
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