c) Water is to be heated from 10°C to 80°C as it flows through a 2-cm-internal-diameter, 7-m- long tube. The tube is equipped with an electric resistance heater, which 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 from the heater is transferred to the water in the tube. If the system is to provide hot water at a rate of 8 L/min, determine the convection heat transfer coefficient and temperature at the inner surface of the pipe at the exit.

Elements Of Electromagnetics
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Author:Sadiku, Matthew N. O.
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c) Water is to be heated from 10°C to 80°C as it flows through a 2-cm-internal-diameter, 7-m-
long tube. The tube is equipped with an electric resistance heater, which 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 from the heater is transferred to the water in the tube. If the
system is to provide hot water at a rate of 8 L/min, determine the convection heat transfer
coefficient and temperature at the inner surface of the pipe at the exit.
d) Hot air at atmospheric pressure and 85°C enters a 10-m long uninsulated square duct of cross
section 0.15m x 0.15m that passes through the attic of a house at a rate of 0.1 m/s. The duct is
observed to be nearly isothermal at 60°C. Determine the rate of heat loss from the duct to the
air space in the attic.
Transcribed Image Text:Q5 c) Water is to be heated from 10°C to 80°C as it flows through a 2-cm-internal-diameter, 7-m- long tube. The tube is equipped with an electric resistance heater, which 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 from the heater is transferred to the water in the tube. If the system is to provide hot water at a rate of 8 L/min, determine the convection heat transfer coefficient and temperature at the inner surface of the pipe at the exit. d) Hot air at atmospheric pressure and 85°C enters a 10-m long uninsulated square duct of cross section 0.15m x 0.15m that passes through the attic of a house at a rate of 0.1 m/s. The duct is observed to be nearly isothermal at 60°C. Determine the rate of heat loss from the duct to the air space in the attic.
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