ASHRAE Journal - June 2012 - 34
proach described above. The OA rate used in the similar zone establishes the minimum OA rate needed to satisfy the subjective evaluation requirement. Of course, identifying a similar zone can be difficult, especially for zones in one-of-a-kind buildings. A substantially similar zone has similar pollutant sources and emission rates, similar or identical contaminants, source-mixtures and impact-mixtures, identical concentration limits, identical air-cleaning efficiency for each pollutant, and an identical specified level of perceived acceptability.
Minimum Outdoor Airflow Rates
The minimum zone OA rate determined using the mass balance calculations must be compared to the rate determined using subjective evaluation. The higher of these two values establishes the minimum breathing zone OA rate for each IAQP zone. Based on these minimum zone OA rates, system-level outdoor air intake flow can be found using the equations in Appendix D of Standard 62.1-2010 (for single-zone systems) or using the equations in the VRP (for multiple-zone systems).
Summary
The IAQP is a valid procedure that has apparently been successfully applied to design ventilation systems in some buildings, especially where the same building design with substantially similar zones is repeated in multiple locations. However, for one-of-a-kind buildings, the IAQP requires designers to make many difficult judgments. In so doing, the required minimum OA rates found using the IAQP are likely to vary considerably from one designer to the next, and may be too low in many cases due to incomplete evaluation of the additive nature of impact-mixtures. For these reasons, many designers are uncomfortable with this approach. Furthermore, most mechanical codes require a prescriptive procedure based on the VRP, and only allow the IAQP as a code variance. Perhaps more designers will use a future version of the IAQP, when more is known about mixtures, sources, air cleaning and subjective evaluation and when designers can make fewer judgments with more confidence. But for now, most designers continue to use the prescriptive VRP to reduce design time, cost, and risk.
References
1. ANSI/ASHRAE Standard 62.1-2010, Ventilation for Acceptable Indoor Air Quality. 2. Stanke, D. 2005. “Standard 62-2001 Addendum 62n: single-path multiple-zone system design.” ASHRAE Journal 47(1):28 – 35. 3. Stanke, D. 2005. “Standard 62.1-2004: designing dual-path, multiple-zone systems” ASHRAE Journal 47(5):20–28. 4. 2009 ASHRAE Handbook—Fundamentals, Chapter 11. 5. 2009 ASHRAE Handbook—Fundamentals, Chapter 11, Tables 11 and 12. 6. ASHRAE. 2010. 62.1 User’s Manual: ANSI/ASHRAE Standard 62.1-2010. June 2012
www.info.hotims.com/41640-59
34
ASHRAE Journal
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
ASHRAE Journal - June 2012 - 43
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
ASHRAE Journal - June 2012 - 62
ASHRAE Journal - June 2012 - 63
ASHRAE Journal - June 2012 - 64
ASHRAE Journal - June 2012 - 65
ASHRAE Journal - June 2012 - 66
ASHRAE Journal - June 2012 - 67
ASHRAE Journal - June 2012 - 68
ASHRAE Journal - June 2012 - 69
ASHRAE Journal - June 2012 - 70
ASHRAE Journal - June 2012 - 71
ASHRAE Journal - June 2012 - 72
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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