Page 13 - Industrial Ventilation Design Guidebook

XJi CONTENTS

9.5 Fans 742
9.5.1 General 742
9.5.2 Centrifugal Fan 746
9.5.3 Axial Fans 758
9.5.4 Effect of Speed of Revolution 762
9.5.5 Fan and Duct Network 764
9.5.6 Series Fan Connection 769
9.5.7 Fan Volume Flow Regulation 770
References 773
9.6 Automatic Control of Air, Handling System (HVAC) 773
9.6.1 Methods for Automation Control 773
9.6.2 Main Type of Control Equipment and Automation Level 774
9.6.3 General Technical Requirements 774
9.6.4 Automation Equipment and Instrumentation 774
9.6.5 Process 775
9.6.6 Controller 775
9.6.7 The Choice of Controllers 777
9.6.8 Sensors 778
9.6.9 Placing of Sensors in HVAC Systems 778
9.6.10 Changing Speed by Using Frequency Converters 781
9.6.11 Building the Control Station 782
9.7 Air Distribution System, Ductwork 783
9.7.1 Friction Loss Calculation 783
9.7.2 Design Methods 786
9.7.3 Thermal Losses by Transmission 787
9.7.4 Air Leakage from Ductwork 788
9.8 Sound Reduction in Air-Handling Systems 790
9.8.1 Basic Concepts 790
9.8.2 Free-Field Noise Transmission 798
9.8.3 Criteria for Acceptable Air-Handling Unit
and HVAC System Noise Levels 800
9.9 Fundamentals of Energy System Optimization in Industrial
Buildings 800
9.9.1 Design Aspects of Energy-Efficient Systems 802
Bibliography 804
9.10 Special Considerations and System Design Aspects 804
9.10.1 Aspects Related to the Quality of Extract or Exhaust Air 804
9.10.2 Other Questions 806
Bibliography 806

10 Local Ventilation 809

10.1 General 809
10.1.1 Purpose and Function 809
10.1.2 Modes 810
10.1.3 Classification 811
10.1.4 What Is Described 812