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A 5-cm-diameter steel pipe is covered with a l-cm layer of insulating material hav- ing k=0.22 W/m-°C followed by a 3-cm-thick layer of another insulating material having k =0.06 W/m-°C. The entire assembly is exposed to a convection surround- ing condition of h =60 W/m2.°C and T-15°C. The outside surface temperature of the steel pipe is 400°C. Calculate the heat lost by the pipe-insulation assembly for a pipe length of 20 m. Express in Watts.

A 5-cm-diameter steel pipe is covered with a l-cm layer of insulating material hav- ing k=0.22 W/m-°C followed by a 3-cm-thick layer of another insulating material having k =0.06 W/m-°C. The entire assembly is exposed to a convection surround- ing condition of h =60 W/m2.°C and T-15°C. The outside surface temperature of the steel pipe is 400°C. Calculate the heat lost by the pipe-insulation assembly for a pipe length of 20 m. Express in Watts.

Introductory Circuit Analysis (13th Edition)
Introductory Circuit Analysis (13th Edition)
13th Edition
ISBN:9780133923605
Author:Robert L. Boylestad
Publisher:Robert L. Boylestad
Chapter1: Introduction
Section: Chapter Questions
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2-31 A5-cm-diameter steel pipe is covered with a 1-cm layer of insulating material hav- ing k =0.22 W/m- °C followed by a 3-cm-thick layer of another insulating material having k = 0.06 W/m- °C. The entire assembly is exposed to a convection surround- ing condition of h=60 W/m2 . °C and T =15°C. The outside surface temperature of the steel pipe is 400°C. Calculate the heat lost by the pipe-insulation assembly for a pipe length of 20 m. Express in Watts.
Transcribed Image Text:2-31 A5-cm-diameter steel pipe is covered with a 1-cm layer of insulating material hav- ing k =0.22 W/m- °C followed by a 3-cm-thick layer of another insulating material having k = 0.06 W/m- °C. The entire assembly is exposed to a convection surround- ing condition of h=60 W/m2 . °C and T =15°C. The outside surface temperature of the steel pipe is 400°C. Calculate the heat lost by the pipe-insulation assembly for a pipe length of 20 m. Express in Watts.
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