Honeywell AUTOMATIC CONTROL SI Edition User Manual

ENGINEERING MANUAL OF AUTOMATIC CONTROL
BUILDING AIRFLOW SYSTEM CONTROL APPLICATIONS
263
CONTENTS
Building Airflow System
Control Applications
ENGINEERING MANUAL OF AUTOMATIC CONTROL
Introduction ............................................................................................................ 265
Definitions ............................................................................................................ 265
Airflow Control Fundamentals ............................................................................................................ 266
Need for Airflow Control ...................................................................... 266
What is Airflow Control ........................................................................ 266
Types of Airflow Systems .................................................................... 267
Variable Air Volume ......................................................................... 267
Constant Air Volume ....................................................................... 267
Variable Versus Constant Air Volume .............................................. 268
Ventilation ............................................................................................ 268
Pressurization ..................................................................................... 270
Building Pressure Balance .............................................................. 270
Containment Pressurization ............................................................ 270
Wind Pressure Effects..................................................................... 271
Stack Effect ..................................................................................... 271
Characteristics of Fans and Fan Laws ................................................ 271
General ........................................................................................... 271
Fan Types ........................................................................................ 272
Fan Performance Terms .................................................................. 272
Fan Laws......................................................................................... 273
Fan Power ....................................................................................... 273
Duct System Curves ....................................................................... 273
Fan Curve and System Curve Comparison .................................... 273
Characteristics of Airflow in Ducts....................................................... 274
General ........................................................................................... 274
Pressure Changes Within a Duct .................................................... 274
Effects of Fittings............................................................................. 276
Effects of Dampers.......................................................................... 276
Effects of Air Terminal Units ............................................................ 276
Measurement of Airflow in Ducts......................................................... 277
General ........................................................................................... 277
Pressure Sensors ........................................................................... 277
Pitot Tube Sensors .......................................................................... 277
Total and Static Pressure Sensors .................................................. 278
Airflow Measuring Devices.............................................................. 279

Honeywell AUTOMATIC CONTROL SI Edition Specifications

General

Brand	Honeywell
Model	AUTOMATIC CONTROL SI Edition
Category	Control Systems
Language	English