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(( 最新 PDF )): ASHRAE 90552:2011 fundamentals of HVAC control systems - SI EDITIO

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(( 最新 PDF )):  - 366 页数         ASHRAE 90552
        Active         2011.01.01         fundamentals of HVAC control systems - SI EDITION
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Contents
i
1 Introduction to HVAC Control Systems 1
1.1 Why Do We Need Controls? 2
1.2 A Brief History of Controls 3
1.3 Control Loops 4
1.4 Control Modes 9
Two-position Control 10
Floating Control 14
Modulating Control 16
Pulse-width Modulating, and Time-proportioning Control 20
1.5 Gains and Loop Tuning 21
1.6 Control Actions and Normal Position 24
1.7 Control Range, and Sequencing 27
1.8 Controls Documentation, Maintenance, and Operations 29
The Next Step 30
2 Basics of Electricity 31
2.1 Simple Circuits and Ohm’s Law 32
2.2 AC Circuits 36
2.3 Transformers and Power Services 40
2.4 Relays 43
2.5 Motors and Motor Starters 46
2.6 Variable Speed Drives 52
2.7 Relay Logic and Ladder Diagrams 55
The Next Step 61
3 Control Valves and Dampers 62
Introduction 62
3.1 Two-way Control Valves 63
Styles and Principles of Operation 63
3.2 Three-way Control Valves 73
3.3 Selecting and Sizing Valves 77
Flow Characteristic Selection 82
Close-off Pressure 85
3.4 Control Dampers 88
Styles and Principles of Operation 88
3.5 Selecting and Sizing Dampers 91

Two-position Duty 92
Capacity Control Duty 94
Mixing Duty 99
The Next Step 106
4 Sensors and Auxiliary Devices 107
4.1 Introduction to Terms 108
Accuracy 108
Range 108
Reliability 109
Repeatability, Precision 109
Transmitter 109
4.2 Temperature Sensors 110
Bimetal 110
Fluid Expansion 112
Electrical, Self-powered 113
Electrical Resistance 114
4.3 Humidity and the Psychrometric Chart 119
Indoor Air is a Mixture of Dry Air and Water Vapor 119
Relative Humidity 120
4.4 Moisture Sensors 130
Relative Humidity Sensors 130
4.5 Pressure Sensors 135
4.6 Flow Sensors and Meters 138
4.7 Auxiliary Devices 149
The Next Step 161
5 Self- and System-powered Controls 162
5.1 Principles of Operation – Self-powered Controls 162
5.2 Examples of Self-Powered Controls 163
Thermopile Controls 163
Hot Water Control Valve 164
Self-powered VAV Diffuser 164
5.3 System-powered Controls 166
System-powered Air Valves 166
System-powered Water System Valves 167
The Next Step 168
6 Electric Controls 169
6.1 Sensors 169
6.2 Controllers, Two-position 171
6.3 Controllers, Modulating 173
6.4 Example Application 176
6.5 Actuators 179
6.6 Auxiliary Devices 180
The Next Step 181
vi

7.1 Principles of Operation 183
7.2 Sensors 185
7.3 Controllers 186
7.4 Actuators 190
7.5 Auxiliary Devices 192
7.6 Compressed Air Supply 198
7.7 Example Applications 200
The Next Step 206
8 Analog Electronic Controls 207
8.1 Principles of Operation 207
8.2 Sensors 208
8.3 Controllers 208
8.4 Actuators 213
8.5 Auxiliary Devices 214
8.6 Example Applications 214
The Next Step 217
9 Control Diagrams and Sequences 218
9.1 Control Systems Design Criteria 219
9.2 Control Systems Design Process 220
9.3 Control Diagrams and Symbols 220
9.4 Control Sequences 222
9.5 Example Applications 224
Typical Single-Zone System 224
Typical Constant Air Volume System with Face
and Bypass Dampers 228
Typical Constant Air Volume System with Multiple Zones
or Reheat 229
Typical Variable Air Volume System 229
Typical Constant Air Volume System, with Variable Speed
Fan for Filter Loading 239
Chiller Plant, Pumps, and Boilers – Monitoring and Control 241
Temperature and Humidity Monitoring and Control 242
Carbon Dioxide Control 243
Exhaust Fan Control 244
Fume Hood Control 245
Condensate Management and Control 247
Ventilation Monitoring and Control 247
Filtration Monitoring and Control 248
Outside Air Monitoring and Control 248
DX – Direct Expansion Systems 248
Water Source Heat Pumps 249

10 DDC Introduction to Hardware and Software 252
10.1 Introduction, and Input and Output Points 252
10.2 I/O Point Characteristics 256
10.3 Control Sequences 260
10.4 Software Introduction 262
10.5 Specific Programming System Features and Parameters 270
10.6 Operator Terminal 280
11 DDC Networks and Controls Protocols 287
11.1 Interoperability 288
11.2 System Hardware Architecture 290
Sample Controllers 297
11.3 Network Standards 300
Ethernet (IEEE 802.3) 300
ARCNET 301
RS-485 301
Wireless 301
11.4 BACnet 304
What is a PICS? 305
1. Devices – Groups of Objects to Manage Activity 306
2. Objects – To Represent Information 306
3. Services – Making and Responding to Requests 308
4. Network – Transporting Request and Responses 309
11.5 LonWorks 311
The Next Step 313
12 Digital Controls Specification 314
12.1 Benefits and Challenges of DDC 315
12.2 Design 319
12.3 Bidding and Interoperability 326
12.4 Monitoring 328
12.5 Wiring 334
Network Wiring 334
Fiber Optic Cable 336
Power Wiring 336
12.6 Commissioning and Warranty 337
12.7 Resources 339
Index 342
Post time 2014-9-18 16:04:03 | Show all posts
buy it already, why do i need reply again?
Post time 2020-7-28 00:42:16 | Show all posts
THANK YOU
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