Steam in a heating system flows through tubes whose outer diameter is 3 cm and whose walls are maintained ot a temperature of 121'C. Circular aluminum alloy fins (k = 180 W/m-K) of outer diameter 6 cm and constant thickness t=2 mm are attached to the tube, as shown in the figure. The space between the fins is 3 mm. Thus, there are 200 fins per meter length of the tube. Heat is transferred to the surrounding air at 25°C, with a combined heat transfer coefficient of 60 W/m K. Determine the increase in heat transfer from the tube per meter length as a result of the attached fins. Efficiency of these circular fins is given to be 0.96. 3 cm 1=2 mm S=3 mm The increase in heat transfer is 3912 W.

Steam in a heating system flows through tubes whose outer diameter is 3 cm and whose walls are maintained ot a temperature of 121'C. Circular aluminum alloy fins (k = 180 W/m-K) of outer diameter 6 cm and constant thickness t=2 mm are attached to the tube, as shown in the figure. The space between the fins is 3 mm. Thus, there are 200 fins per meter length of the tube. Heat is transferred to the surrounding air at 25°C, with a combined heat transfer coefficient of 60 W/m K. Determine the increase in heat transfer from the tube per meter length as a result of the attached fins. Efficiency of these circular fins is given to be 0.96. 3 cm 1=2 mm S=3 mm The increase in heat transfer is 3912 W.

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

Steam in a heating system flows through tubes whose outer diameter is 3 cm and whose walls are maintained ot a temperature of
121'C. Circular aluminum alloy fins (k = 180 W/m-K) of outer diameter 6 cm and constant thickness t=2 mm are attached to the tube, as
shown in the figure. The space between the fins is 3 mm. Thus, there are 200 fins per meter length of the tube. Heat is transferred to
the surrounding air at 25°C, with a combined heat transfer coefficient of 60 W/m K. Determine the Increase in heat transfer from the
tube per meter length as a result of the attached fins. Efficiency of these circular fins is given to be 0.96.
n=15 cm
=3 cm
I=2 mm
S=3 mm
The increase in heat transfer is
3912 W.

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