ASHRAE London - Oct News
see web site for full newsletter:
http://londoncanada.ashraechapters.org/
GREENBUILD - Oct 5 & 6
http://www.greenbuildexpo.org
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.
Regards,
Grant
Wilson Miles
Senior Officer
EcoEnergy Initiative, Buildings Division
Office of Energy Efficiency,
Natural Resources Canada
Tel: (613) 947-0381 | Fax: (613) 947-0373
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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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