A steam pipe (k = 45 having 70 mm inside diameter and 85 mm outside diameter is lagged with two insulation layers; the layer in contact with the pipe is 35 mm asbestos (k = 0.15 W/m°C) and it is covered with 25 mm thick magnesia insulation (k = 0.075 W/m°C). The heat transfer coefficients for the inside and outside surfaces are 220 W/m2°C and 6.5 W/m2°C respectively. If the temperature of steam is 350°C and the ambient temperature is 30°C, calculate: a) The steady loss of heat for 50 m length of the pipe; b) The overall heat transfer coefficients based on inside and outside surfaces of the lagged steam main. -Steam main (A) Asbestos (RY
A steam pipe (k = 45 having 70 mm inside diameter and 85 mm outside diameter is lagged with two insulation layers; the layer in contact with the pipe is 35 mm asbestos (k = 0.15 W/m°C) and it is covered with 25 mm thick magnesia insulation (k = 0.075 W/m°C). The heat transfer coefficients for the inside and outside surfaces are 220 W/m2°C and 6.5 W/m2°C respectively. If the temperature of steam is 350°C and the ambient temperature is 30°C, calculate: a) The steady loss of heat for 50 m length of the pipe; b) The overall heat transfer coefficients based on inside and outside surfaces of the lagged steam main. -Steam main (A) Asbestos (RY
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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Question
Pr
![A steam pipe (k = 45 W/m°C) having 70 mm inside diameter and 85 mm outside
diameter is lagged with two insulation layers; the layer in contact with the pipe is 35 mm
asbestos (k = 0.15 W/m°C) and it is covered with 25 mm thick magnesia insulation (k =
0.075 W/m°C). The heat transfer coefficients for the inside and outside surfaces are 220
W/m²°C and 6.5 W/m2°C respectively. If the temperature of steam is 350°C and the
ambient temperature is 30°C, calculate:
a) The steady loss of heat for 50 m length of the pipe;
b) The overall heat transfer coefficients based on inside and outside surfaces of the
lagged steam main.
- Steam main (A)
-Asbestos (B)
- Magnesia (C)
With best wishes
Steam
of=30°C
Air](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2F323c9976-6b7b-4414-aa82-41105edc66ec%2F0e1aef94-0e09-49b2-a16e-b14c8593f0b7%2F8m8snxq_processed.jpeg&w=3840&q=75)
Transcribed Image Text:A steam pipe (k = 45 W/m°C) having 70 mm inside diameter and 85 mm outside
diameter is lagged with two insulation layers; the layer in contact with the pipe is 35 mm
asbestos (k = 0.15 W/m°C) and it is covered with 25 mm thick magnesia insulation (k =
0.075 W/m°C). The heat transfer coefficients for the inside and outside surfaces are 220
W/m²°C and 6.5 W/m2°C respectively. If the temperature of steam is 350°C and the
ambient temperature is 30°C, calculate:
a) The steady loss of heat for 50 m length of the pipe;
b) The overall heat transfer coefficients based on inside and outside surfaces of the
lagged steam main.
- Steam main (A)
-Asbestos (B)
- Magnesia (C)
With best wishes
Steam
of=30°C
Air
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