• ASHRAE 90138
  • Revision:2010 Edition, 2010
  • Published Date:January 2010
  • Status:Active, Most Current
  • Document Language:
  • Published By:American Society of Heating, Refrigerating and Air-Conditioning Engineers (ASHRAE)
  • Page Count:310
  • ANSI Approved:No
  • DoD Adopted:No

  • Introduction

    Fans, duct systems, duct elements (such as filters and coils),dampers, and actuators all work together to control airflow. Thistext provides resources for building good judgment of theengineering principles needed to size, select, install, and adjustcontrol dampers. Mechanical designers; mechanical and controlcontractors; and testing, adjusting, and balancing (TAB)contractors are the target audience of this book. Each specializesin a different part of the heating, ventilating, andair-conditioning (HVAC) system. Some material presented here isalready familiar to each of these groups, and some material fallsoutside their normal areas of concern. For example, the informationon loss coefficients and pressure loss is basic to the mechanicalengineer; however, it is unfamiliar to most control contractors.Much of the subject material bridges gaps that exist betweendisciplines. The gaps observed in air systems are as follows:

    • Lack of understanding of the final control element—thedamper

    • Lack of understanding of the detailed methods of the othertrades on a project

    • Lack of understanding of the complexity of airflows

    There are many articles published regarding, for example, indoorair quality (IAQ) that say what actions to take. However,there are few suggestions for how they should be taken.This book addresses how to apply dampers within systems to achieveclearly defined goals. The control of airflow in any commercialbuilding is necessary for a variety of functions:

    • Temperature control

    • IAQ (ventilation)

    • Envelope pressure control (mold and infiltration control)

    • Elevator door operation

    • Exterior door operation

    •Exhaust Makeup air

    • Pressure cascade from one zone to another

    • Mitigation/control of chemical, biological, and radiological(CBR) release

    • Smoke containment using shaft and wall dampers

    • Smoke control using pressure differentials

    • Atria and large-space smoke extraction

    • Stairwell pressurization

    • Egress corridor smoke control

    • Zone smoke control

    Fans and dampers are the primary control devices for airflowmanagement. Fans are adequately covered in many available technicalpublications, such as those published by the Air Movement andControl Association (AMCA 2002). However, this is the first bookwritten about dampers. Many articles and manufacturer bulletinsexist, and product information is available from manufacturers, butnothing is comprehensive.

    The principles explained are applicable to all damperapplications. Fire and smoke control texts offer good insight intoairflow strategy and tactics and are sources of information notavailable elsewhere. For more information, see Chapter 16.

    ASHRAE 90138

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