ASHRAE London - Oct News
see web site for full newsletter: http://londoncanada.ashraechapters.org/
GREENBUILD - Oct 5 & 6
Phone # for GREENBUILD - FREE PASS
offered by: Natural Resources Canada Booth 2139N
1-866-579-8413 to register
For you and your colleagues can use this as well
I look forward to seeing everyone at the show - Booth # 2139 in the North Building.
Grant Wilson Miles
EcoEnergy Initiative, Buildings Division
Office of Energy Efficiency, Natural Resources Canada
Tel: (613) 947-0381 | Fax: (613) 947-0373
Alternative to ASHRAE Standard 62.1 Ventilation Rate Procedure Proposed
ATLANTA Public comment is being sought on the proposed allowance of an additional default value to the ventilation rate procedure in ASHRAE?s indoor air quality standard.
ANSI/ASHRAE Standard 62.1-2010, Ventilation for Acceptable Indoor Air Quality, sets minimum ventilation rates and other requirements for commercial and institutional buildings. The ventilation rate procedure provides a prescriptive method for determining minimum ventilation requirements. It accounts for pollutant sources from both the building and its occupants, and allows the designer to account for the efficiency of different ventilation systems when delivering outdoor air to the breathing zone.
Some users of Standard 62.1 believe that the ventilation rate procedure is ?too complicated,? according to Standard 62.1 chair Roger Hedrick. ?While the 62.1 committee disagrees with this in most cases the basics of the VRP are quite straightforward the committee agrees that application of the multiple-zone recirculating system equations described in Section 6.2.5 and Appendix A can be complex.?
Proposed addendum f, open for public review until Oct. 16, provides an additional default value for Vpz.
"Difficulty determining an appropriate value for Vpz seems to be a frequent issue with users of the multiple space equations,? he said. ?The committee decided that supplying a default value would simplify application. However, the default value is necessarily conservative. In a large number of applications, determining the 'lowest zone primary airflow value expected at the design condition analyzed' will result in a value for Vpz that is higher than the default, resulting in a reduced outdoor air intake requirement."
Addendum f is open for public review until Oct. 16, 2011, along with proposed addendum h. Also, proposed addendum g to the standard is open for public review until Oct. 31, 2011. For more information, visit www.ashrae.org/publicreviews. The other addenda open for public review are:
One concern about allowing CO2-based demand controlled ventilation in these spaces is that the volume per person in these spaces is typically large, which means that CO2 concentration changes will have longer than usual lag times behind occupancy changes, he noted.
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