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Steam at 180 0C flows in a circular pipe, which is composed of 3 different materials (A, B and C). The pipe is located in a room at 20 0C. Convection heat transfer coefficient between the steam and the inner surface of the wall is 27.777 W/m2K. Convection and radiation heat transfer coefficient between the outer surface of the pipe and the air are 7 and 3 W/m2K, respectively. Thermal resistances of the layers are RA=0.02 0C/W, RB=0.03 0C/W and RC=0.08 0C/W. The inner and the outer surface area of the pipe are A1=1.8 and A4=2 m2, respectively. What is the temperature at interface 3?   a. 142 0C b. 124 0C c. 138 0C d. 134 0C e. 130 0C

Steam at 180 0C flows in a circular pipe, which is composed of 3 different materials (A, B and C). The pipe is located in a room at 20 0C. Convection heat transfer coefficient between the steam and the inner surface of the wall is 27.777 W/m2K. Convection and radiation heat transfer coefficient between the outer surface of the pipe and the air are 7 and 3 W/m2K, respectively. Thermal resistances of the layers are RA=0.02 0C/W, RB=0.03 0C/W and RC=0.08 0C/W. The inner and the outer surface area of the pipe are A1=1.8 and A4=2 m2, respectively. What is the temperature at interface 3?   a. 142 0C b. 124 0C c. 138 0C d. 134 0C e. 130 0C

Elements Of Electromagnetics
Elements Of Electromagnetics
7th Edition
ISBN:9780190698614
Author:Sadiku, Matthew N. O.
Publisher:Sadiku, Matthew N. O.
ChapterMA: Math Assessment
Section: Chapter Questions
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Steam at 180 0C flows in a circular pipe, which is composed of 3 different materials (A, B and C). The pipe is located in a room at 20 0C. Convection heat transfer coefficient between the steam and the inner surface of the wall is 27.777 W/m2K. Convection and radiation heat transfer coefficient between the outer surface of the pipe and the air are 7 and 3 W/m2K, respectively. Thermal resistances of the layers are RA=0.02 0C/W, RB=0.03 0C/W and RC=0.08 0C/W. The inner and the outer surface area of the pipe are A1=1.8 and A4=2 m2, respectively. What is the temperature at interface 3?

 

a.

142 0C

b.

124 0C

c.

138 0C

d.

134 0C

e.

130 0C

Steam at 180 °C flows in a circular pipe, which is composed of 3 different materials (A, B and C). The pipe is located in a room at 20 °C. Convection heat transfer coefficient between the steam and the inner surface of the wall is 27.777 W/m2K. Convection and radiation heat transfer coefficient between the outer surface of the pipe and the air are 7 and 3 W/m?K, respectively. Thermal resistances of the layers are Ra=0.02 °C/W, R3=0.03 °C/W and Rc=0.08 °C/W. The inner and the outer surface area of the pipe are A, =1.8 and A4=2 m2 respectively. What is the temperature at interface 3? Tout=20 °C hout.conv=10 W/m²K hout.rad=5 W/m²K Tin=180 °C\A h=27.777 W/m?K 2 4 r,=5 cm r2=5.5 cm r3=6 cm r4=6.33 cm О а. 142 °с ОБ. 124 °С Ос. 138 °C O d. 134 °C Ое. 130 °с
Transcribed Image Text:Steam at 180 °C flows in a circular pipe, which is composed of 3 different materials (A, B and C). The pipe is located in a room at 20 °C. Convection heat transfer coefficient between the steam and the inner surface of the wall is 27.777 W/m2K. Convection and radiation heat transfer coefficient between the outer surface of the pipe and the air are 7 and 3 W/m?K, respectively. Thermal resistances of the layers are Ra=0.02 °C/W, R3=0.03 °C/W and Rc=0.08 °C/W. The inner and the outer surface area of the pipe are A, =1.8 and A4=2 m2 respectively. What is the temperature at interface 3? Tout=20 °C hout.conv=10 W/m²K hout.rad=5 W/m²K Tin=180 °C\A h=27.777 W/m?K 2 4 r,=5 cm r2=5.5 cm r3=6 cm r4=6.33 cm О а. 142 °с ОБ. 124 °С Ос. 138 °C O d. 134 °C Ое. 130 °с
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