A hot gas at 300°C with convective heat transfer coefficient of 100 W/m²-K is flowing through an uninsulated steel tube of 8 cm outside diameter, thickness of 1.3 cm and length of 50 meters. The thermal conductivity of the steel tube is 45 W/m-K and is exposed to ambient temperature of 30°C with convective heat transfer coefficient of 5 W/m²-K. It is proposed to install one layer of insulation to reduce the heat loss on the steel tube. As a future mechanical engineer, determine which material from table 1 is more effective to use as insulation:
A hot gas at 300°C with convective heat transfer coefficient of 100 W/m²-K is flowing through an uninsulated steel tube of 8 cm outside diameter, thickness of 1.3 cm and length of 50 meters. The thermal conductivity of the steel tube is 45 W/m-K and is exposed to ambient temperature of 30°C with convective heat transfer coefficient of 5 W/m²-K. It is proposed to install one layer of insulation to reduce the heat loss on the steel tube. As a future mechanical engineer, determine which material from table 1 is more effective to use as insulation:
Elements Of Electromagnetics
7th Edition
ISBN:9780190698614
Author:Sadiku, Matthew N. O.
Publisher:Sadiku, Matthew N. O.
ChapterMA: Math Assessment
Section: Chapter Questions
Problem 1.1MA
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Transcribed Image Text:1. A hot gas at 300°C with convective heat transfer coefficient of 100 W/m²-K is
flowing through an uninsulated steel tube of 8 cm outside diameter, thickness of
1.3 cm and length of 50 meters. The thermal conductivity of the steel tube is 45
W/m-K and is exposed to ambient temperature of 30°C with convective heat
transfer coefficient of 5 W/m²-K. It is proposed to install one layer of insulation to
reduce the heat loss on the steel tube. As a future mechanical engineer, determine
which material from table 1 is more effective to use as insulation:
Table 1
Material
Stone Wool
Fiberglass
Cork
Thermal Conductivity
(W/m-K)
0.0364
0.0430
0.038
Thickness (mm)
100
75
80
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