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ASHRAE Guideline 16 2018

ASHRAE Guideline 16 2018

$41.71

ASHRAE Guideline 16-2018 – Selecting Outdoor, Return, and Relief Dampers for Air-Side Economizer Systems

Published By Publication Date Number of Pages
ASHRAE 2018 18
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Guideline 16 provides the basis for selecting and sizing control dampers (outdoor, return, and relief) commonly found in constant-air-volume (CAV) and variable-air-volume (VAV) air-handling units (AHU) and systems with air-side economizers.

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PDF Pages PDF Title
1 ASHRAE Guideline 16-2018
3 CONTENTS
4 1. PURPOSE
2. SCOPE
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
3.1 Definitions of most terms used in this guideline can be found in ASHRAE Terminology of Heating, Ventilation, Air Conditioning, & Refrigeration (ASHRAE 1991).
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
4.1 General
5 Figure 1 Arrangement 1: HVAC system with a return fan (with minimum outdoor-air control Approach A).
6 Figure 2 Arrangement 2: HVAC system with a relief fan (with minimum outdoor-air control Approach B).
7 Figure 3 Arrangement 3: HVAC system with a gravity or motorized relief damper (with minimum outdoor-air control Approach C).
4.2 Return Fan System
8 Figure 4 Overlapping damper control.
Figure 5 Sequenced damper control.
9 4.3 Relief Fan System
4.4 Relief Damper System
10 5. DAMPER SELECTION RATIONALE
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…
Figure 6 Installed opposed-blade damper characteristic curves.3,6
Figure 7 Installed parallel-blade damper characteristic curves.4,6
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…
11 Figure 8 Airflow measurement test setup for Figures 9 and 10.
Figure 9 Parallel-blade damper in a test setup with opposing airflow.
Figure 10 Opposed-blade damper test setup.
6. REFERENCES
12 Figure 11 Performance of parallel-blade dampers in return-air and outdoor-air paths at 0.28 in. wg external pressure.5 To convert pressure loss in in. wg to Pa, multiply by 250.
Figure 12 Performance of parallel-blade dampers in return-air and outdoor-air paths at 0.38 in. wg external pressure.5 To convert pressure loss in in. wg to Pa, multiply by 250.
13 Figure 13 Performance of parallel-blade dampers in return-air and outdoor-air paths at 0.50 in. wg external pressure.5 To convert pressure loss in in. wg to Pa, multiply by 250.
INFORMATIVE ANNEX A—INSTALLATION OF DAMPERS
INFORMATIVE ANNEX B—SENSING BUILDING PRESSURES
14 INFORMATIVE ANNEX C—EXAMPLE PROBLEM
15 Figure C-1 Schematic of example problem.
16 INFORMATIVE ANNEX D—BIBLIOGRAPHY

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ASHRAE Guideline 16 2018
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