A tube bank uses an aligned arrangement of 15-mm-diameter tubes with Sy= S = 30 mm. There are 10 rows of tubes with 50 tubes in each row. Consider an application for which cold water flows through the tubes, maintaining the outer surface temperature at 40°C, while flue gases at 427°C and a velocity of 7 m/s are in cross flow over the tubes. The properties of the flue gas may be approximated as those of atmospheric air at 427°C. What is the total rate of heat transfer per unit length of the tubes in the bank, in kW/m?

A tube bank uses an aligned arrangement of 15-mm-diameter tubes with Sy= S = 30 mm. There are 10 rows of tubes with 50 tubes in each row. Consider an application for which cold water flows through the tubes, maintaining the outer surface temperature at 40°C, while flue gases at 427°C and a velocity of 7 m/s are in cross flow over the tubes. The properties of the flue gas may be approximated as those of atmospheric air at 427°C. What is the total rate of heat transfer per unit length of the tubes in the bank, in kW/m?

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

A tube bank uses an aligned arrangement of 15-mm-diameter tubes with ST = S = 30 mm. There are 10 rows of tubes with 50
tubes in each row. Consider an application for which cold water flows through the tubes, maintaining the outer surface temperature at
40°C, while flue gases at 427°C and a velocity of 7 m/s are in cross flow over the tubes. The properties of the flue gas may be
approximated as those of atmospheric air at 427°C. What is the total rate of heat transfer per unit length of the tubes in the bank, in
kW/m?
i 89
kW/m

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Step 1: Write the goven data with suitable variables.

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Step 2: Write the properties of air at given temperature.

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Step 3: Find the heat transfer coefficient and LMTD.

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Step 4: Find the heat transfer.

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