Water is to be heated from 15°C to 65°C as it flows through a 3-cm-internaldiameter 5-m-long tube . The tube is equipped with an electric resistance heater that provides uniform heating throughout the surface of the tube. The outer surface of the heater is well insulated, so that in steady operation all the heat generated in the heater is transferred to the water in the tube. If the system is to provide hot water at a rate of 10 L/min, determine the power rating of the resistance heater. Also, estimate the inner surface temperature of the tube at the exit.

Elements Of Electromagnetics
7th Edition
ISBN:9780190698614
Author:Sadiku, Matthew N. O.
Publisher:Sadiku, Matthew N. O.
ChapterMA: Math Assessment
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Water is to be heated from 15°C to 65°C as it flows through a 3-cm-internaldiameter
5-m-long tube . The tube is equipped with an electric
resistance heater that provides uniform heating throughout the surface of
the tube. The outer surface of the heater is well insulated, so that in steady
operation all the heat generated in the heater is transferred to the water in
the tube. If the system is to provide hot water at a rate of 10 L/min, determine
the power rating of the resistance heater. Also, estimate the inner surface
temperature of the tube at the exit.

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