AUTOMOTIVE TECHNOLOGY TECH MANUAL
7th Edition
ISBN: 9781337794220
Author: ERJAVEC
Publisher: CENGAGE L
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Textbook Question
Chapter 6, Problem 3MC
Technician A says that a pyrometer measures temperature. Technician B says that a thermometer measures temperature. Who is correct?
- Technician A
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Students have asked these similar questions
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 6 Solutions
AUTOMOTIVE TECHNOLOGY TECH MANUAL
Ch. 6 - Explain why testlights are not recommended for...Ch. 6 - Name the two basic types of compression gauges.Ch. 6 - What tool is used to test engine manifold vacuum.Ch. 6 - Describe two methods of trapping asbestos/brake...Ch. 6 - True or False? A compression gauge will show the...Ch. 6 - True or False? A lab scope is a visual voltmeter...Ch. 6 - True or False? A brake shoe adjusting gauge is an...Ch. 6 - Prob. 1MCCh. 6 - Technician A says that a brake drum micrometer has...Ch. 6 - Technician A says that a pyrometer measures...
Ch. 6 - Prob. 4MCCh. 6 - Technician A uses a digital volt/ohmmeter to test...Ch. 6 - Technician A says that a charging station removes...Ch. 6 - Which of the following statements about manifold...Ch. 6 - When conducting an oil pressure test: Technician A...Ch. 6 - Which of the following conditions can be revealed...Ch. 6 - Technician A uses a high-impedance testlight on...Ch. 6 - Technician A says that a sulfated and plugged fuel...Ch. 6 - The tests conducted by a scan tool can also be...Ch. 6 - When using a fuel injector pulse tester....Ch. 6 - To measure engine cranking current, a DNIM...Ch. 6 - While discussing a clutch alignment tool....Ch. 6 - Technician A says that ball joints may be pressed...Ch. 6 - Which of the following is not a suitable way to...Ch. 6 - Prob. 18MC
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