Chapter 5: Fans and Blowers

5.0 Introduction 3
5.1 Fans / Blowers Related Important References 3
5.2 Fan / Blower Terminology 3
5.2.1 Total Pressure versus Static Pressure 5
5.3 Performance of Fans / Blowers 6
5.3.1 Performance Curve of Fan / Blowers 6
5.3.2 System Characteristics 9
5.3.3 Fan Characteristics 9
5.3.4 System Characteristics and Fan Curves 10
5.4 Classification of Fans / Blowers 12
5.4.1 Axial Flow Fans 14
5.4.2 Centrifugal Fans 19
5.4.3 Centrifugal Blower 22
5.4.4 Drive Arrangement 23
5.4.5 Comparison amongst Various Centrifugal Fan Types 24
5.4.5.1 Fan Design and Selection 24
5.4.5.2 Fan Performance and Efficiency 24
5.4.5.3 Centrifugal Fans / Blowers with AF Blades 26
5.4.5.4 Centrifugal Fans / Blowers with BC and BI Blades 27
5.4.5.5 Centrifugal Fans / Blowers with Radial Tip Blades (RT) 29
5.4.5.6 Centrifugal Fans / Blowers with Forward Curved (FC) Blades 30
5.4.5.7 Pressure Blowers, Turbo Blowers 33
5.4.5.8 Axial-Centrifugal Fan / Blowers 34
5.4.5.9 Vortex Blowers 35
5.5 Process Control of Fan / Blowers 42
5.5.1 Series and Parallel Operation 44
5.5.2 Factors to be considered in the Selection of Flow Control Methods 46
5.5.3 Comparisons of Similar Fans & Blowers 50
5.6 Process Calculation for Fans / Blowers 54
5.7 Process Data Sheet for Fans & Blowers 55
5.8 Technical Bid Analysis 57
5.9 Fans & Blower Glossary 58
5.10 References 59

Share this post