Water enters a thin-shelled 4-cm-diameter, 200-m-long pipe at 7°C at a rate of 0.98 kg/s and leaves at 8°C. The pipe is exposed to ambient air at 30°C with a heat transfer coefficient of 9 W/m²K. If the pipe is to be insulated with glass wool insulation (k=0.05 W/mK) in order to decrease the temperature rise of water to 0.25°C, determine the required thickness of the insulation.

Water enters a thin-shelled 4-cm-diameter, 200-m-long pipe at 7°C at a rate of 0.98 kg/s and leaves at 8°C. The pipe is exposed to ambient air at 30°C with a heat transfer coefficient of 9 W/m²K. If the pipe is to be insulated with glass wool insulation (k=0.05 W/mK) in order to decrease the temperature rise of water to 0.25°C, determine the required thickness of the insulation.

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

1. Water enters a thin-shelled 4-cm-diameter, 200-m-long pipe at 7°C at a rate of 0.98 kg/s
and leaves at 8°C. The pipe is exposed to ambient air at 30°C with a heat transfer
coefficient of 9 W/m²K. If the pipe is to be insulated with glass wool insulation (k= 0.05
W/mK) in order to decrease the temperature rise of water to 0.25°C, determine the
required thickness of the insulation.
Insulation
Water
L

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