Welding: Principles and Applications (MindTap Course List)
8th Edition
ISBN: 9781305494695
Author: Larry Jeffus
Publisher: Cengage Learning
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Chapter 17, Problem 4R
What determines the correct current setting for a GTA weld?
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A counter flow double pipe heat exchanger is being used to cool hot oil from 320°F to 285°F
using cold water. The water, which flows through the inner tube, enters the heat exchanger at 70°F
and leaves at 175°F. The inner tube is ¾-std type L copper. The overall heat transfer coefficient
based on the outside diameter of the inner tube is 140 Btu/hr-ft2-°F. Design conditions call for a
total heat transfer duty (heat transfer rate between the two fluids) of 20,000 Btu/hr. Determine the
required length of this heat exchanger (ft).
!
Required information
A one-shell-pass and eight-tube-passes heat exchanger is used to heat glycerin (cp=0.60 Btu/lbm.°F) from 80°F to 140°F
by hot water (Cp = 1.0 Btu/lbm-°F) that enters the thin-walled 0.5-in-diameter tubes at 175°F and leaves at 120°F. The total
length of the tubes in the heat exchanger is 400 ft. The convection heat transfer coefficient is 4 Btu/h-ft²°F on the glycerin
(shell) side and 70 Btu/h-ft²°F on the water (tube) side.
NOTE: This is a multi-part question. Once an answer is submitted, you will be unable to return to this part.
Determine the rate of heat transfer in the heat exchanger before any fouling occurs.
Correction factor F
1.0
10
0.9
0.8
R=4.0 3.0 2.0.15 1.0 0.8.0.6 0.4 0.2
0.7
0.6
R=
T1-T2
12-11
0.5
12-11
0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0
(a) One-shell pass and 2, 4, 6, etc. (any multiple of 2), tube passes
P=
T₁-11
The rate of heat transfer in the heat exchanger is
Btu/h.
!
Required information
Air at 25°C (cp=1006 J/kg.K) is to be heated to 58°C by hot oil at 80°C (cp = 2150 J/kg.K) in a cross-flow heat exchanger
with air mixed and oil unmixed. The product of heat transfer surface area and the overall heat transfer coefficient is 750
W/K and the mass flow rate of air is twice that of oil.
NOTE: This is a multi-part question. Once an answer is submitted, you will be unable to return to this part.
Air
Oil
80°C
Determine the effectiveness of the heat exchanger.
Chapter 17 Solutions
Welding: Principles and Applications (MindTap Course List)
Ch. 17 - What effect does torch angle have on the shielding...Ch. 17 - Why must the end of the filler rod be kept in the...Ch. 17 - What can cause tungsten contamination?Ch. 17 - What determines the correct current setting for a...Ch. 17 - What is the lowest acceptable amperage setting for...Ch. 17 - List the factors that affect the gas flow setting...Ch. 17 - When should the minimum gas flow rates be...Ch. 17 - What is the minimum gas flow rate for a nozzle...Ch. 17 - What is the maximum gas flow rate for a nozzle...Ch. 17 - Which incorrect welding parameters does stainless...
Ch. 17 - Using Table 17-4, determine the approximate...Ch. 17 - Using Table 17-3, Table 17-5, and Table 17-6, list...Ch. 17 - Why is it possible to control a large aluminum...Ch. 17 - What may happen to the end of the aluminum welding...Ch. 17 - What should be done if someone comes in contact...Ch. 17 - Using Table 17-7, determine the suggested setting...Ch. 17 - What can be done to limit oxide formation on...Ch. 17 - How should the filler metal be added to the molten...Ch. 17 - How can the rod be freed if it sticks to the...Ch. 17 - How is an outside corner joint assembled?Ch. 17 - What must be done with the weld craters when back...Ch. 17 - What can prevent both sides of a stainless steel...Ch. 17 - How is the filler metal added for a 3F weld?Ch. 17 - What can cause undercutting on a 3F tee joint?Ch. 17 - What helps hold the weld in place on a 2F lap...Ch. 17 - What helps hold the weld in place on a 4G weld?
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