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ASHRAE Guideline 16-2022 -- Selecting Outdoor, Return, and Relief Dampers for Air-Side Economizer Systems, 2022
- ASHRAE Guideline 16-2022 [Go to Page]
- CONTENTS
- FOREWORD
- 1. PURPOSE
- 2. SCOPE [Go to Page]
- 2.1 This guideline covers the application of mixed-air control dampers in AHUs and systems that incorporate air-side economizer systems for cooling.
- 2.2 This guideline addresses the selection of control dampers based on damper characteristics and damper pressure drop.
- 2.3 This guideline is not intended to cover dampers used elsewhere in heating, ventilating, and air- conditioning (HVAC) systems.
- 2.4 This guideline does not cover air mixing.
- 3. DEFINITIONS [Go to Page]
- 3.1 Definitions of most terms used in this guideline can be found in ASHRAE Terminology of Heating, Ventilation, Air Conditioning, & Refrigeration 1.
- 3.2 Terms used in this guideline that are not found in ASHRAE Terminology of Heating, Ventilation, Air Conditioning, & Refrigeration or that are used differently are defined in this section.
- 4. SYSTEM ARRANGEMENTS [Go to Page]
- 4.1 General
- 4.2 Return Fan System
- 4.3 Relief Fan System
- 4.4 Relief Damper System
- 5. DAMPER SELECTION RATIONALE [Go to Page]
- 5.1 Arrangement 1 (Figure 1). The relief damper (D-1) is generally the duct or relief louver size. In this case, the a-value is high (5 to 10 range). In order to achieve a linear response, it is necessary to use an opposed-blade damper (Figure 6). A ...
- 5.2 Arrangement 2 (Figure 2) and Arrangement 3 (Figure 3). The return-air damper (D-2) and the economizer outdoor-air damper (D-3) are selected to be parallel-blade dampers so that there is little or no change in pressure drop across the mixing box w...
- 6. REFERENCES
- INFORMATIVE APPENDIX A: INSTALLATION OF DAMPERS
- INFORMATIVE APPENDIX B: SENSING BUILDING PRESSURES
- INFORMATIVE APPENDIX C: EXAMPLE PROBLEM
- INFORMATIVE APPENDIX: D BIBLIOGRAPHY [Go to Page]
