Critical Radius for Insulation. A metal steam pipe having an outside diameter of 30 mm has a surface temperature of 400 K and is to be insulated with an insulation having a thickness of 20 mm and a k of 0.08 W/m·K. The pipe is exposed to air at 300 K and a convection coefficient of 30 W/m² · K. (a) Calculate the critical radius and the heat loss per m of length for the bare pipe. (b) Calculate the heat loss for the insulated pipe assuming that the surface temperature of the pipe remains constant. (b) q = 54.4 W
Critical Radius for Insulation. A metal steam pipe having an outside diameter of 30 mm has a surface temperature of 400 K and is to be insulated with an insulation having a thickness of 20 mm and a k of 0.08 W/m·K. The pipe is exposed to air at 300 K and a convection coefficient of 30 W/m² · K. (a) Calculate the critical radius and the heat loss per m of length for the bare pipe. (b) Calculate the heat loss for the insulated pipe assuming that the surface temperature of the pipe remains constant. (b) q = 54.4 W
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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Transcribed Image Text:Critical Radius for Insulation. A metal steam pipe having an outside diameter of
30 mm has a surface temperature of 400 K and is to be insulated with an
insulation having a thickness of 20 mm and a k of 0.08 W/m· K. The pipe is
exposed to air at 300 K and a convection coefficient of 30 W/m² · K.
(a) Calculate the critical radius and the heat loss per m of length for the bare
pipe.
(b) Calculate the heat loss for the insulated pipe assuming that the surface
temperature of the pipe remains constant.
Ans. , (b) q =
54.4 W
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