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During its manufacture process, a plate glass at 640°C is cooled by passing air over its surface such that the convectio
Posted: Sun Jul 10, 2022 11:37 am
by answerhappygod
- During Its Manufacture Process A Plate Glass At 640 C Is Cooled By Passing Air Over Its Surface Such That The Convectio 1 (285.6 KiB) Viewed 42 times
During its manufacture process, a plate glass at 640°C is cooled by passing air over its surface such that the convection heat transfer coefficient is 12 W/m² K. To prevent cracking, it is known that the temperature gradient must not exceed 12°C/mm at any point in the glass during the cooling process. If the thermal conductivity of the glass is 1.45 W/m K and its surface emissivity is 0.75, what is the lowest temperature of the air that can initially be used for cooling? Assume that the temperature of the air equals that of the surroundings