Answered: 60 mm and an outer diameter of 75 mm.…

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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Steam passes at 250 ° C through a steel pipe with an inner diameter of 60 mm and an outer diameter of 75 mm. Pipe The heat transfer coefficients inside and outside are 500 and 25 W / m2K, respectively. Ambient temperature 20 ° C and The heat conduction coefficient of the pipe is 56.5 W / mK.

a)Find the heat loss from the 5 m length of the pipe.

b)What thickness of material with heat transfer coefficient 0.035 W / mK to reduce heat loss by 95%? insulation should be made.

T1= 250°C
h = 500W/m K
T2 = 20°C
h, = 25 W/m K
k 56.5 W/mK

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