Solution Manual For Refrigeration and Air Conditioning Technology, 8th Edition

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’s Manual
to Accompany
Refrigeration
and
Air Conditioning
Technology
8th Edition
Concepts, Procedures, and
Troubleshooting Techniques
John A. Tomczyk
Eugene Silberstein
William C. Whitman
William M. Johnson
SOLUTION MANUAL

Preface v
PART I ’s Guide 1
Unit 1 Heat, Temperature, and Pressure 1
Unit 2 Matter and Energy 3
Unit 3 Refrigeration and Refrigerants 6
Unit 4 General Safety Practices 10
Unit 5 Tools and Equipment 11
Unit 6 Fasteners 12
Unit 7 Tubing and Piping 14
Unit 8 Leak Detection, System Evacuation, and System Cleanup 17
Unit 9 Refrigerant and Oil Chemistry and Management—Recovery, Recycling,
Reclaiming, and Retrofitting 20
Unit 10 System Charging 23
Unit 11 Calibrating Instruments 26
Unit 12 Basic Electricity and Magnetism 28
Unit 13 Introduction to Automatic Controls 31
Unit 14 Automatic Control Components and Applications 33
Unit 15 Troubleshooting Basic Controls 36
Unit 16 Advanced Automatic Controls—Direct Digital Controls (DDCs)
and Pneumatics 38
Unit 17 Types of Electric Motors 40
Unit 18 Application of Motors 42
Unit 19 Motor Controls 44
Unit 20 Troubleshooting Electric Motors 46
Unit 21 Evaporators and the Refrigeration System 48
Unit 22 Condensers 50
Unit 23 Compressors 53
Unit 24 Expansion Devices 56
Unit 25 Special Refrigeration System Components 59
Unit 26 Applications of Refrigeration Systems 62
Unit 27 Commercial Ice Machines 65
Unit 28 Special Refrigeration Applications 69
Unit 29 Troubleshooting and Typical Operating Conditions for
Commercial Refrigeration 70
Unit 30 Electric Heat 72
Unit 31 Gas Heat 75
Unit 32 Oil Heat 82
Unit 33 Hydronic Heat 86
Unit 34 Indoor Air Quality 89
Unit 35 Comfort and Psychrometrics 91
Unit 36 Refrigeration Applied to Air-Conditioning 93
Unit 37 Air Distribution and Balance 95
Unit 38 Installation 98
Unit 39 Residential Energy Auditing 101
Unit 40 Typical Operating Conditions 105
Unit 41 Troubleshooting 107
Unit 42 Heat Gains and Heat Losses in Structures 110
Unit 43 Air Source Heat Pumps 112
Unit 44 Geothermal Heat Pumps 116
iii
Contents

iv Contents
Unit 45 Domestic Refrigerators and Freezers 118
Unit 46 Room Air Conditioners 121
Unit 47 High-pressure, Low-pressure, and Absorption Chilled-Water Systems 123
Unit 48 Cooling Towers and pumps 126
Unit 49 Operation, Maintenance, and Troubleshooting of
Chilled-Water Air-Conditioning Systems 128
Unit 50 Commercial packaged Rooftop, Variable Refrigerant Flow, and
Variable Air Volume Systems 130
PART II Lecture Outlines 133
PART III Correlation Guide 365

Heat, Temperature, and Pressure 1
PART I ’s Guide
Heat, Temperature, and Pressure
This unit covers temperature, methods of measuring
and transferring heat, and discussions pertaining to
molecular motion, sensible heat, latent heat, and specific
heat. It also discusses atmospheric pressure and test
instruments such as gauges used to measure pressure.
There are review questions at the end of the unit in the
text that may be assigned as an out-of-class activity and
then used to enhance class discussion. Key terms listed in
the Lab Manual and Workbook may also be used as an as-
signment and/or basis for discussion. The Review Test in the
Lab Manual and Workbook may be used as an end-of-unit
test or for further discussion.
OBJECTIVES
After studying this unit, the student should be able to:
● define temperature.
● make conversions between the Fahrenheit and Celsius
scales.
● describe molecular motion at absolute zero.
● define the British thermal unit.
● describe heat flow between substances of different
temperatures.
● explain the transfer of heat by conduction, convec-
tion, and radiation.
● discuss sensible heat, latent heat, and specific heat.
● state atmospheric pressure at sea level and explain
why it varies at different elevations.
● describe two types of barometers.
● explain psig and psia as they apply to pressure
measurements.
SAFETY ChECklIST
● HVAC/R technicians are often exposed to very high
and very low temperatures. Be sure to wear gloves and
other appropriate pieces of personal protection equip-
ment (PPE) to reduce the chances of getting injured.
● Many fluids that are used by the HVAC/R technicians
are under pressure. Be sure to transport all pressure
vessels vertically and be sure they are properly secured.
● Make certain that all tanks are properly capped to
prevent accidental releases from the tanks.
● Make certain all test instruments are properly cali-
brated and fully operational to ensure accurate pres-
sure and temperature readings.
AhRI CURRICUlUM GUIDE COMPETENCIES
Background and related information is included in this
unit for many of the competencies listed in the follow-
ing areas of training in the AHRI Curriculum Guide:
● PRINCIPLES OF THERMODYNAMICS AND HEAT
TRANSFER
 Matter and Heat Behavior
 Fluids and Pressures
EXERCISES (lAB MANUAl)
Exercises 1-1 and 1-2
UNIT 1 ANSWERS
TO REVIEW QUESTIONS (TEXT)
1. B.
2. At atmospheric pressure of 14.696 psia or 29.92 in Hg.
3. Fahrenheit, Celsius, Rankine, and Kelvin.
4. 0°C.
5. −460°F.
6. 1 pound of water 1°F.
7. D.
8. Heat transfers from molecule to molecule.
9. A.
10. C.
11. Heat is transferred by moving in a medium such as
air or water.
12. Heat is transferred through space without heating
the space and heats the first solid object the heat
energy strikes.
13. Substance.
14. 29.92 in Hg, 14.696 psia.
15. 14.696.
16. 26.7°C.
17. 71.6°F.
Unit 1
1

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