Grimsrud, University of Minnesota Shirley J. These values have been chosen to control C02 and other contaminants with an adequate margin of safety and to account for health variations among people, varied activity levels, and a moderate amount of smoking. ASHRAE Standards are reviewed every 5 years or less, and are updated regularly to incorporate the newest proven technology. This paper highlights some of the key features of the design procedures in Standard 62 and summarizes the status of the review process.
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It is unreasonable to expect ventilation, which acts primarily by dilution and displacement of indoor contaminants, to provide acceptable indoor air quality by itself.
If so, its value would typically range from 0. The amounts of outdoor air to be supplied to various types of spaces are conveniently tabulated, and readily used by designers.
Another special emphasis is on making clearer links between sources of contaminants and control of indoor air quality by ventilation, source management, or air cleaning.
For presentation at 5th. The Indoor Air Quality Procedure was originally developed to determine how much ventilation might be reduced below the rates specified by the Ventilation Rate Procedure.
These values have been chosen to control C02 and other contaminants with an adequate margin of safety and to account axhrae health variations among people, varied activity levels, and a moderate amount of smoking.
How can the scientific basis for the health and comfort aspects of Standard 62 be improved? Its state-of-knowledge guidance is the best available basis for ventilation system requirements in mechanical sections of building codes for North America.
Options for control of contaminants from sources other than occupants might best be evaluated by a more fully developed version of the Indoor Air Quality Procedure. The Ventilation Rate Procedure might therefore be best suited to supplying effective ventilation for control of occupant odor, thermal comfort, moisture from high-moisture areas such as kitchens and bathrooms, and conditions that discourage the growth and dispersion of microbial contaminants.
The Standard also introduced an alternative Indoor Air Quality Procedure to permit innovative, energy-conserving ventilation practices.
Interpretations for Standard
Furthermore, Standard 62 contains very little information on how to use this procedure. This would be consistent with the current statement in the Standard that covers cases "where unusual indoor contaminants or sources are present or anticipated. An appendix, which is not considered a part of the Standard, contains a compilation of criteria and guidance for a broader range of contaminants. Samet How can the roles of source control and air cleaning be better integrated into the Standard?
The Ventilation Rate Procedure prescribes the rate at which ventilation air must be delivered to a space and various ashrrae to condition that air.
Interpretations for Standard 62-1989
However, it requires knowledge of contaminants that will be present, acceptable concentrations of these contaminants to protect health and ensure sensory comfort, and sources of these contaminants. The Standards are written under strictly administered rules that define committee size; committee balance among affected parties i. The committee consists of 25 designers, equipment manufacturers, regulators, and researchers.
ASHRAE Standards are reviewed every 5 years or asbrae, and are updated regularly to incorporate the newest proven technology.
Interpretations for Standard 62-1999
Tables of design values for C, the maximum acceptable concentrations of indoor contaminants or source-related contaminant mixtureswould be necessary. Sherber, Carrier Corporation Steven T. Wellford What editorial changes need ashraee be made e. Guidelines for Ventilation Requirements in Zshrae. The designer would then need emission rate data on materials, products, and activities for the space being designed.
As more information becomes available on sources and their emissions, and the health and comfort effects of those emissions, use of this procedure may very well increase. The revised version of that Standard, StandardVentilation for Acceptable Indoor Air Quality, recommended air flow rates for smoking-permitted and smoking- prohibited conditions in most spaces.
Environmental Protection Agency Arthur E. This paper highlights some of the key features of the current Standard and summarizes the status of the review process. The single contaminant listed for sensory comfort criteria-carbon dioxide-is listed as a surrogate for human body odor. A table of design values for this correction factor could be developed, similar to the table of such values in the European ventilation guidelines The 13 voting members of the committee are: Unfortunately, these numbers are sometimes 62-198 without a very aahrae understanding of ventilation and how it relates to indoor air quality.
The review committee is also committed to simplifying and clarifying the Standard where possible, in response to requests from design engineers and building code officials. sshrae