Transient Heating of a Concrete Wall. A wall made of concrete 0.305 m thick is insulated on the rear side. The wall at a uniform temperature of 10°C (283.2 K) is exposed on the front side to a gas at 843°C (1116.2 K). The convection coefficient is 28.4 W/m² · K, the thermal diffusivity is 1.74 x 10~3 m²/h, and the thermal conductivity is 0.935 W/m · K. (a) Calculate the time for the temperature at the insulated face to reach 232°C (505.2 K). (b) Calculate the temperature at a point 0.152 m below the surface at this same time. Ans. (a) at/x = 0.25, t = 13.4 h
Transient Heating of a Concrete Wall. A wall made of concrete 0.305 m thick is insulated on the rear side. The wall at a uniform temperature of 10°C (283.2 K) is exposed on the front side to a gas at 843°C (1116.2 K). The convection coefficient is 28.4 W/m² · K, the thermal diffusivity is 1.74 x 10~3 m²/h, and the thermal conductivity is 0.935 W/m · K. (a) Calculate the time for the temperature at the insulated face to reach 232°C (505.2 K). (b) Calculate the temperature at a point 0.152 m below the surface at this same time. Ans. (a) at/x = 0.25, t = 13.4 h
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
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Transcribed Image Text:Transient Heating of a Concrete Wall. A wall made of concrete 0.305 m thick is
insulated on the rear side. The wall at a uniform temperature of 10°C (283.2 K) is
exposed on the front side to a gas at 843°C (1116.2 K). The convection coefficient
is 28.4 W/m? · K, the thermal diffusivity is 1.74 x 10-3 m²/h, and the thermal
conductivity is 0.935 W/m · K.
(a) Calculate the time for the temperature at the insulated face to reach 232°C
(505.2 K).
(b) Calculate the temperature at a point 0.152 m below the surface at this same
time.
Ans. (a) at/x; = 0.25, t = 13.4 h
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