a. An air stream passing through a 2-inch (1/6 ft) diameter, thin-walled tube is to be heated by high-pressure steam condensing on the outer surface of the tube at 320 °F. The overall heat transfercoefficient, h between steam and air can be assumed to be 25 Btu/(ft2.hr °F) with the air enteringat 100 ft/sec, 10 psia, 40 °F. The air is to be heated to 150 °F. Determine the tube length required.Assuming Rayleigh Line flow, calculate the static pressure change due to heat addition.Also, for the same inlet conditions, calculate the pressure drop due to friction, assuming Fannoflow in the duct with f = 0.018.b.c.d.To obtain an approximation to the overall pressure drop in this heat exchanger, add the tworesults. Discuss the accuracy of this calculation.

Given: The diameter of thin walled tube is D=2 in1 ft12 in=16 ft. The temperature is T=320°F. The…

An air stream passing through a 2-inch (1/6 ft) diameter, thin-walled tube is to be heated by high- pressure steam condensing on the outer surface of the tube at 320 °F. The overall heat transfer coefficient, h between steam and air can be assumed to be 25 Btu/(ft2 hr °F) with the air entering at 100 ft/sec, 10 psia, 40 °F. The air is to be heated to 150 °F. Determine the tube length required. b. Assuming Rayleigh Line flow, calculate the static pressure change due to heat addition. C. Also, for the same inlet conditions, calculate the pressure drop due to friction, assuming Fanno flow in the duct with f = 0.018. a. d. To obtain an approximation to the overall pressure drop in this heat exchanger, add the two results. Discuss the accuracy of this calculation.

An air stream passing through a 2-inch (1/6 ft) diameter, thin-walled tube is to be heated by high- pressure steam condensing on the outer surface of the tube at 320 °F. The overall heat transfer coefficient, h between steam and air can be assumed to be 25 Btu/(ft2 hr °F) with the air entering at 100 ft/sec, 10 psia, 40 °F. The air is to be heated to 150 °F. Determine the tube length required. b. Assuming Rayleigh Line flow, calculate the static pressure change due to heat addition. C. Also, for the same inlet conditions, calculate the pressure drop due to friction, assuming Fanno flow in the duct with f = 0.018. a. d. To obtain an approximation to the overall pressure drop in this heat exchanger, add the two results. Discuss the accuracy of this calculation.

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. An air stream passing through a 2-inch (1/6 ft) diameter, thin-walled tube is to be heated by high-
pressure steam condensing on the outer surface of the tube at 320 °F. The overall heat transfer
coefficient, h between steam and air can be assumed to be 25 Btu/(ft2.hr °F) with the air entering
at 100 ft/sec, 10 psia, 40 °F. The air is to be heated to 150 °F. Determine the tube length required.
Assuming Rayleigh Line flow, calculate the static pressure change due to heat addition.
Also, for the same inlet conditions, calculate the pressure drop due to friction, assuming Fanno
flow in the duct with f = 0.018.
b.
c.
d.
To obtain an approximation to the overall pressure drop in this heat exchanger, add the two
results. Discuss the accuracy of this calculation.

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Step 1: Determine the tube length required.

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Step 2: Calculate the velocity at exit.

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Step 3: Calculate the Mach number at inlet and outlet

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Step 4: Calculate the heat transfer to the air.

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Step 5: Determine the length of tube.

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