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. 15.7 Plate glass, k = 1.35 W/m K, 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 not crack, to limit the maximum temperature gradient in the glass to 15 K/cm during the cooling process. At the start of the cooling process, what is the lowest temperature of the cooling air that can be used?

. 15.7 Plate glass, k = 1.35 W/m K, 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 not crack, to limit the maximum temperature gradient in the glass to 15 K/cm during the cooling process. At the start of the cooling process, what is the lowest temperature of the cooling air that can be used?

Introduction to Chemical Engineering Thermodynamics
Introduction to Chemical Engineering Thermodynamics
8th Edition
ISBN:9781259696527
Author:J.M. Smith Termodinamica en ingenieria quimica, Hendrick C Van Ness, Michael Abbott, Mark Swihart
Publisher:J.M. Smith Termodinamica en ingenieria quimica, Hendrick C Van Ness, Michael Abbott, Mark Swihart
Chapter1: Introduction
Section: Chapter Questions
Problem 1.1P
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15.7 Plate glass, k = 1.35 W/m K, 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 not crack, to limit the maximum temperature gradient in the glass to 15 K/cm during the cooling process. At the start of the cooling process, what is the lowest temperature of the cooling air that can be used?
Transcribed Image Text:15.7 Plate glass, k = 1.35 W/m K, 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 not crack, to limit the maximum temperature gradient in the glass to 15 K/cm 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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