ASHRAE Journal - June 2012 - 26

Minimum Outdoor Airflow Using the IAQ Procedure
A
By Dennis Stanke, Fellow ASHRAE

NSI/ASHRAE Standard 62.1-20101 includes three alternative

native deserves a detailed discussion and consideration in some cases.

procedures for determining minimum outdoor airflow (OA) rates:

Summary of the IAQP
The following steps must be completed to find the minimum required breathing zone OA rate for each zone using the IAQP: 1. Identify all contaminants-of-concern and mixtures-of-concern (see sidebar Mixtures-of-Concern) for the zone.* For simplicity, this article refers to all indoor contaminants and mixtures and mixture constituents as “zone pollutants.” 2. Identify both indoor and outdoor sources for each zone pollutant. 3. Determine the emission rate for each zone pollutant from each of its identified sources. 4. Specify a concentration limit and exposure time for each individual contaminant, citing an appropriate cogAbout the Author
Dennis Stanke is staff applications engineer for Trane Commercial Systems, Ingersoll Rand, in La Crosse, Wis. He is chair of SSPC 189.1.

the ventilation rate procedure (VRP), the indoor air quality procedure (IAQP), and the natural ventilation procedure (NVP).
The VRP prescribes minimum zonelevel OA rates and procedures to find system-level OA intake rates. The IAQP allows compliance based on contaminant concentrations and perceived air quality, which constitute IAQ performance criteria. The NVP prescribes minimum outdoor air opening sizes to ensure local natural (passive) ventilation; in most cases, naturally ventilated zones must use “mixed-mode” ventilation, so either the VRP or the IAQP must also be applied to determine required mechanical ventilation whenever passive ventilation is undesirable or ineffective. Previous articles2,3 have described compliance with the VRP requirements. Because most engineers use the VRP, most building codes base minimum outdoor airflow requirements on it, and several energy labeling programs and building rating systems require compliance with the VRP. This article, however, describes compliance with the IAQP requirements (see sidebar IAQP Requirements); although not widely used (primarily because it requires significant judgment on the part of the designer), this valid compliance alter-

*Although Section 6.3.1 seems to require identification of either contaminants-of-concern or mixtures-of-concern, designers are likely to interpret this as a requirement to identify all contaminants-of-concern and all mixtures-of-concern; it just makes sense. The Standard 62.1 committee should be asked to interpret this requirement.

26

ASHRAE Journal

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June 2012



ASHRAE Journal - June 2012

Table of Contents for the Digital Edition of ASHRAE Journal - June 2012

Contents
Commentary
Industry News
Letters
Meetings and Shows
Feature Articles
Minimum Outdoor Airflow Using the IAQ Procedure
Basics of Atrium Smoke Control
 Long-Term Commercial GSHP Performance Part 1: Project Overview and Loop Circuit Types
Optimizing Design & Control of Chilled Water Plants Part 5: Optimized Control Sequences
Technology Award Case Studies:
Retail in Cold Climate
Rethinking Hospital Design
Standing Columns
Refrigeration Applications
Emerging Technologies
Engineering Applications
Washington Report
Products
IAQ Applications
Special Products
Classified Advertising
Advertisers Index
ASHRAE Journal - June 2012 - Intro
ASHRAE Journal - June 2012 - Cover1
ASHRAE Journal - June 2012 - Cover2
ASHRAE Journal - June 2012 - 1
ASHRAE Journal - June 2012 - 2
ASHRAE Journal - June 2012 - Contents
ASHRAE Journal - June 2012 - Commentary
ASHRAE Journal - June 2012 - 5
ASHRAE Journal - June 2012 - Industry News
ASHRAE Journal - June 2012 - 7
ASHRAE Journal - June 2012 - 8
ASHRAE Journal - June 2012 - 9
ASHRAE Journal - June 2012 - 10
ASHRAE Journal - June 2012 - 11
ASHRAE Journal - June 2012 - 12
ASHRAE Journal - June 2012 - 13
ASHRAE Journal - June 2012 - Letters
ASHRAE Journal - June 2012 - 15
ASHRAE Journal - June 2012 - 16
ASHRAE Journal - June 2012 - 17
ASHRAE Journal - June 2012 - 18
ASHRAE Journal - June 2012 - 19
ASHRAE Journal - June 2012 - 20
ASHRAE Journal - June 2012 - 21
ASHRAE Journal - June 2012 - 22
ASHRAE Journal - June 2012 - 23
ASHRAE Journal - June 2012 - Meetings and Shows
ASHRAE Journal - June 2012 - 25
ASHRAE Journal - June 2012 - Minimum Outdoor Airflow Using the IAQ Procedure
ASHRAE Journal - June 2012 - 27
ASHRAE Journal - June 2012 - 28
ASHRAE Journal - June 2012 - 29
ASHRAE Journal - June 2012 - 30
ASHRAE Journal - June 2012 - 31
ASHRAE Journal - June 2012 - 32
ASHRAE Journal - June 2012 - 33
ASHRAE Journal - June 2012 - 34
ASHRAE Journal - June 2012 - 35
ASHRAE Journal - June 2012 - Basics of Atrium Smoke Control
ASHRAE Journal - June 2012 - 37
ASHRAE Journal - June 2012 - 38
ASHRAE Journal - June 2012 - 39
ASHRAE Journal - June 2012 - 40
ASHRAE Journal - June 2012 - 41
ASHRAE Journal - June 2012 - 42
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ASHRAE Journal - June 2012 - 44
ASHRAE Journal - June 2012 - 45
ASHRAE Journal - June 2012 - 46
ASHRAE Journal - June 2012 - 47
ASHRAE Journal - June 2012 -  Long-Term Commercial GSHP Performance Part 1: Project Overview and Loop Circuit Types
ASHRAE Journal - June 2012 - 49
ASHRAE Journal - June 2012 - 50
ASHRAE Journal - June 2012 - 51
ASHRAE Journal - June 2012 - 52
ASHRAE Journal - June 2012 - 53
ASHRAE Journal - June 2012 - 54
ASHRAE Journal - June 2012 - 55
ASHRAE Journal - June 2012 - Optimizing Design & Control of Chilled Water Plants Part 5: Optimized Control Sequences
ASHRAE Journal - June 2012 - 57
ASHRAE Journal - June 2012 - 58
ASHRAE Journal - June 2012 - 59
ASHRAE Journal - June 2012 - 60
ASHRAE Journal - June 2012 - 61
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ASHRAE Journal - June 2012 - 73
ASHRAE Journal - June 2012 - 74
ASHRAE Journal - June 2012 - 75
ASHRAE Journal - June 2012 - Retail in Cold Climate
ASHRAE Journal - June 2012 - 77
ASHRAE Journal - June 2012 - 78
ASHRAE Journal - June 2012 - 79
ASHRAE Journal - June 2012 - 80
ASHRAE Journal - June 2012 - 81
ASHRAE Journal - June 2012 - 82
ASHRAE Journal - June 2012 - 83
ASHRAE Journal - June 2012 - Rethinking Hospital Design
ASHRAE Journal - June 2012 - 85
ASHRAE Journal - June 2012 - 86
ASHRAE Journal - June 2012 - 87
ASHRAE Journal - June 2012 - 88
ASHRAE Journal - June 2012 - 89
ASHRAE Journal - June 2012 - 90
ASHRAE Journal - June 2012 - 91
ASHRAE Journal - June 2012 - 92
ASHRAE Journal - June 2012 - 93
ASHRAE Journal - June 2012 - Refrigeration Applications
ASHRAE Journal - June 2012 - 95
ASHRAE Journal - June 2012 - Emerging Technologies
ASHRAE Journal - June 2012 - 97
ASHRAE Journal - June 2012 - 98
ASHRAE Journal - June 2012 - 99
ASHRAE Journal - June 2012 - Engineering Applications
ASHRAE Journal - June 2012 - 101
ASHRAE Journal - June 2012 - 102
ASHRAE Journal - June 2012 - Washington Report
ASHRAE Journal - June 2012 - Products
ASHRAE Journal - June 2012 - 105
ASHRAE Journal - June 2012 - IAQ Applications
ASHRAE Journal - June 2012 - 107
ASHRAE Journal - June 2012 - 108
ASHRAE Journal - June 2012 - Special Products
ASHRAE Journal - June 2012 - 110
ASHRAE Journal - June 2012 - Classified Advertising
ASHRAE Journal - June 2012 - Advertisers Index
ASHRAE Journal - June 2012 - Cover3
ASHRAE Journal - June 2012 - Cover4
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