11.3 A type-302 stainless steel tube of inner and outer diameters D¡ = 22 mm and Do = 27 mm, respectively, is used in a cross-flow heat exchanger. The fouling factors, R'f, for the inner and outer surfaces are estimated to be 0.0004 and 0.0002 m² K/W, respectively. Fouling Ro factors Water Tm.i= 75°C um,i = 0.5 m/s Ri Air V₂ = 20 m/s T= 15°C Tube, SS302 Di Do (a) Determine the overall heat transfer coefficient based on the outside area of the tube, Uo. Compare the thermal resistances due to convection, tube wall conduction, and fouling. (b) Instead of air flowing over the tube, consider a situation for which the cross-flow fluid is water at 15°C with a velocity of Vo = 1 m/s. Determine the overall heat transfer coefficient based on the outside area of the tube, Uo. Compare the thermal resistances due to convection, tube wall conduction, and fouling.

11.3 A type-302 stainless steel tube of inner and outer diameters D¡ = 22 mm and Do = 27 mm, respectively, is used in a cross-flow heat exchanger. The fouling factors, R'f, for the inner and outer surfaces are estimated to be 0.0004 and 0.0002 m² K/W, respectively. Fouling Ro factors Water Tm.i= 75°C um,i = 0.5 m/s Ri Air V₂ = 20 m/s T= 15°C Tube, SS302 Di Do (a) Determine the overall heat transfer coefficient based on the outside area of the tube, Uo. Compare the thermal resistances due to convection, tube wall conduction, and fouling. (b) Instead of air flowing over the tube, consider a situation for which the cross-flow fluid is water at 15°C with a velocity of Vo = 1 m/s. Determine the overall heat transfer coefficient based on the outside area of the tube, Uo. Compare the thermal resistances due to convection, tube wall conduction, and fouling.

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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Concept explainers

Heat Exchangers

Heat exchangers are the types of equipment that are primarily employed to transfer the thermal energy from one fluid to another, provided that one of the fluids should be at a higher thermal energy content than the other fluid.

Heat Exchanger

The heat exchanger is a combination of two words ''Heat'' and ''Exchanger''. It is a mechanical device that is used to exchange heat energy between two fluids.

Question

In handwriting please
answer only a and b

11.3 A type-302 stainless steel tube of inner and outer diameters D¡ = 22 mm and Do = 27 mm, respectively, is used in a
cross-flow heat exchanger. The fouling factors, R'f, for the inner and outer surfaces are estimated to be 0.0004 and 0.0002
m² K/W, respectively.
Fouling Ro
factors
Water
Tm.i= 75°C
um,i = 0.5 m/s
Ri
Air
V₂ = 20 m/s
T= 15°C
Tube, SS302
Di Do
(a) Determine the overall heat transfer coefficient based on the outside area of the tube, Uo. Compare the thermal
resistances due to convection, tube wall conduction, and fouling.
(b) Instead of air flowing over the tube, consider a situation for which the cross-flow fluid is water at 15°C with a velocity of
Vo = 1 m/s. Determine the overall heat transfer coefficient based on the outside area of the tube, Uo. Compare the thermal
resistances due to convection, tube wall conduction, and fouling.
(c) For the water-air conditions of part (a) and mean velocities, um, i, of 0.2, 0.5, and 1.0 m/s, plot the overall heat
transfer coefficient as a function of the cross-flow velocity for 5≤ Vo ≤ 30 m/s.
(d) For the water-water conditions of part (b) and cross-flow velocities, Vo, of 1, 3, and 8 m/s, plot the overall heat
transfer coefficient as a function of the mean velocity for 0.5 ≤ um, i ≤ 2.5 m/s.

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