• Document: COMMERCIAL HVAC AIR-HANDLING EQUIPMENT. Fans in VAV Systems
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COMMERCIAL HVAC AIR-HANDLING EQUIPMENT Fans in VAV Systems Technical Development Programs (TDP) are modules of technical training on HVAC theory, system design, equipment selection and application topics. They are targeted at engineers and designers who wish to develop their knowledge in this field to effectively design, specify, sell or apply HVAC equipment in commercial applications. Although TDP topics have been developed as stand-alone modules, there are logical group- ings of topics. The modules within each group begin at an introductory level and progress to advanced levels. The breadth of this offering allows for customization into a complete HVAC curriculum – from a complete HVAC design course at an introductory-level or to an advanced- level design course. Advanced-level modules assume prerequisite knowledge and do not review basic concepts. One of the reasons that VAV (Variable Air Volume) systems are popular is because they pro- vide fan energy savings that constant volume systems cannot. As a general statement, fans consume more energy in a typical HVAC system than the compressors. Therefore, it is important that the correct type of VAV fan be used for the application. Equally important is that the fan in a VAV system is stable at part load operation, as well as full load operation. This TDP module will explain the types of fans that can be used in VAV systems, as well as the controls that may be applied to regulate each. © 2005 Carrier Corporation. All rights reserved. The information in this manual is offered as a general guide for the use of industry and consulting engineers in designing systems. Judgment is required for application of this information to specific installations and design applications. Carrier is not responsible for any uses made of this information and assumes no responsibility for the performance or desirability of any resulting system design. The information in this publication is subject to change without notice. No part of this publication may be reproduced or transmitted in any form or by any means, electronic or mechanical, for any purpose, without the express written permission of Carrier Corporation. Printed in Syracuse, NY CARRIER CORPORATION Carrier Parkway Syracuse, NY 13221, U.S.A. Table of Contents Introduction ..................................................................................................................................... 1 Fan Impact ....................................................................................................................................... 2 Fan Types ........................................................................................................................................ 3 Centrifugal Fans........................................................................................................................... 3 Axial Fans (In-Line) .................................................................................................................... 4 Centrifugal Fans .............................................................................................................................. 4 Impeller Design............................................................................................................................ 5 Forward-Curved....................................................................................................................... 5 Airfoil and Backward-Inclined ................................................................................................ 6 Plenum Fan .............................................................................................................................. 7 Axial (In-line) Fans.......................................................................................................................... 8 Fan Volume Control ........................................................................................................................ 9 Controllable Pitch Axial .......................................................................................................... 9 Modudrive ............................................................................................................................ 10 ® Discharge Damper ................................................................................................................. 10 System Bypass ....................................................................................................................... 13 No Volume Control (Riding the Fan Curve) ......................................................................... 14 Inlet Guide Vanes .................................................................................................................. 15 Variable Frequency Drives .................................................................................................... 17 Eddy Cu

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