Water is to be heated from 15C to 65 C as it flows through a 3 cm internal diameter 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. The water properties at the bulk mean temperature are: density=992.1 kg/m3, k = 0.631 W/m.K, v= 0.658 x 10* m^2/s, Cp = 4.179 kJ/kg. K, Pr = 4.32
Water is to be heated from 15C to 65 C as it flows through a 3 cm internal diameter 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. The water properties at the bulk mean temperature are: density=992.1 kg/m3, k = 0.631 W/m.K, v= 0.658 x 10* m^2/s, Cp = 4.179 kJ/kg. K, Pr = 4.32
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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Water is to be heated from 15C to 65 C as it flows through a 3 cm internal diameter 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.
The water properties at the bulk mean temperature are: density=992.1 kg/m3, k = 0.631 W/m.K, v= 0.658 x 10* m^2/s, Cp = 4.179 kJ/kg. K, Pr = 4.32.
Transcribed Image Text:15°C
k
q, = constant
Water
5 m
D = 3 cm
个个
65°C
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