62.1 Addenda for Public Review
Post date: Mar 12, 2012 4:24:20 PM
For more information go to: www.ashrae.org/standards-research--technology/public-review-drafts
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These drafts are scheduled for a 30-day public review from March 23, 2012 to April 22, 2012:
1. BSR/ASHRAE Addendum f to ANSI/ASHRAE Standard 62.1-2010, Ventilation for Acceptable Indoor Air Quality (Second Public Review Draft)
Some users of 62.1 believe that the ventilation rate procedure is “too complicated.” SSPC 62.1 disagrees with this in most cases – the basics of the VRP are quite straightforward. The SSPC agrees that application of the multiple-zone recirculating system equations described in Section 6.2.5 and Appendix A can be complex. The first public review provided a default value for Vpz. Based on a public review comment the SSPC has revised the approach used. Table 6-3 provides default values for Ev based on Max (Zp) up to a value of 0.55. For higher values of Max (Zp), then Appendix A is needed to be used to determine Ev. This proposed addendum will provide a default value for Ev for values of Max (Zp) above 0.55.
2. BSR/ASHRAE Addendum h to ANSI/ASHRAE Standard 62.1-2010, Ventilation for Acceptable Indoor Air Quality (Second Public Review Draft)
Standard 62.1-2010, Table 6-1, includes ventilation rates for “Sports arena (play area)” and “Gym, stadium (play area).” Both space types have ventilation rates based on floor area only, the per person rate is zero. Users of the standard have expressed interest in applying demand controlled ventilation to these space types, which is effectively prohibited by the lack of a per person component to the ventilation rate. This proposed addendum replaces both of these space types with “Gym, Sports Arena (play area)”, with Rp = 20 cfm/person and Ra = 0.06 cfm/ft² and assigns this new space type with an air class of 2 rather than class 1 from the first publication public review version.
3. ASHRAE Addendum i to ANSI/ASHRAE Standard 62.1-2010, Ventilation for Acceptable Indoor Air Quality (Advisory Public Review Draft)
Recent studies have shown that excessively low humidity may result in unacceptable indoor air quality. This proposed addendum is being sent out for advisory public review (APR) to obtain additional input from interested parties. In particular, the SSPC is interested in the appropriateness of the relative humidity limit and the climate zones where the requirement applies. However, any other input is welcomed.
4. BSR/ASHRAE Addendum k to ANSI/ASHRAE Standard 62.1-2010, Ventilation for Acceptable Indoor Air Quality (First Public Review Draft)
This proposed addendum adds an exception to the recirculation limits on Class 4 exhaust airstreams from laboratory hoods which would allow use of heat wheel energy recovery in some cases. The exception defines several criteria which the airstream must meet before such heat recovery can be used, and the heat recovery system must limit recirculation airflow to less than 0.5% of the outdoor air intake flow.
5. BSR/ASHRAE Addendum l to ANSI/ASHRAE Standard 62.1-2010, Ventilation for Acceptable Indoor Air Quality (First Public Review Draft)
This proposed addendum adds a refrigerated warehouse space type to Table 6-1, providing revised ventilation rates for these spaces. These rates include a “People Outdoor Air Rate, Rp” which will require ventilation during periods of expected occupancy, but do not include an “Area Outdoor Air Rate, Ra” which will allow the ventilation rate to be zero for refrigerated warehouses with no occupants. Note E to Table 6-1 is modified to indicate that if combustion powered equipment (e.g., a propane forklift) is used in the space, additional ventilation is required.
These drafts are scheduled for a 45-day public review from March 23, 2012 to May 7, 2012:
1. BSR/ASHRAE Addendum j to ANSI/ASHRAE Standard 62.1-2010, Ventilation for Acceptable Indoor Air Quality (First Public Review Draft)
This proposed addendum adds requirements to the Indoor Air Quality Procedure (IAQP) for determining minimum ventilation rates which require consideration of the combined effects of multiple contaminants of concern on individual organ systems. This “additive” effect is already implicit in the Ventilation Rate Procedure. This proposed change is intended to improve the IAQP by requiring consideration of these additive effects that are well established in the literature for many organ systems. The change requires identifying those contaminants of concern which act on individual organs and identifying those contaminants as a “contaminant mixture of concern.”