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A furnace wall is made up of three layers. The thickness and thermal conductivities of the inner kA ke kc and outer layers are 200 mm and 20 w/m.'C, and T,0 100 mm and 50 W/m.°C, respectively. Under steady conditions, the outer surface temperature of the furnace wall is 40 °C, the inner surface temperature is 775 °C. The inside of the furnace is exposed to LA Le Lc 200 mm 100 mm gases at 800 °C with a heat transfer coefficient of 120 W/m?."C. Determine; a) the thermal conductivity of the material in between. b) the heat transfer coefficient between the outer surface and the outer environment at 20 °C.

A furnace wall is made up of three layers. The thickness and thermal conductivities of the inner kA ke kc and outer layers are 200 mm and 20 w/m.'C, and T,0 100 mm and 50 W/m.°C, respectively. Under steady conditions, the outer surface temperature of the furnace wall is 40 °C, the inner surface temperature is 775 °C. The inside of the furnace is exposed to LA Le Lc 200 mm 100 mm gases at 800 °C with a heat transfer coefficient of 120 W/m?."C. Determine; a) the thermal conductivity of the material in between. b) the heat transfer coefficient between the outer surface and the outer environment at 20 °C.

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
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A furnace wall is made up of three layers. The kA ke kc thickness and thermal conductivities of the inner and outer layers are 200 mm and 20 W/m.°C, and Tsi T50 100 mm and 50 W/m.°C, respectively. Under steady conditions, the outer surface temperature of the furnace wall is 40 °c, the inner surface temperature is 775 °C. The inside of the furnace is exposed to LA La Lc 200 mm 100 mm gases at 800 °C with a heat transfer coefficient of 120 W/m².°C. Determine; a) the thermal conductivity of the material in between. b) the heat transfer coefficient between the outer surface and the outer environment at 20 °C.
Transcribed Image Text:A furnace wall is made up of three layers. The kA ke kc thickness and thermal conductivities of the inner and outer layers are 200 mm and 20 W/m.°C, and Tsi T50 100 mm and 50 W/m.°C, respectively. Under steady conditions, the outer surface temperature of the furnace wall is 40 °c, the inner surface temperature is 775 °C. The inside of the furnace is exposed to LA La Lc 200 mm 100 mm gases at 800 °C with a heat transfer coefficient of 120 W/m².°C. Determine; a) the thermal conductivity of the material in between. b) the heat transfer coefficient between the outer surface and the outer environment at 20 °C.
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