[Bldg-sim] Infiltration Schedule
Doug Maddox
DougM at TWGI.com
Mon Feb 9 05:59:07 PST 2009
Is the 0.2 to 0.5 ACH based on blower door testing? Did you apply some
sort of conversion to get from the blower door pressure differential to
a typical real world pressure?
Doug Maddox
The Weidt Group
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From: bldg-sim-bounces at lists.onebuilding.org
[mailto:bldg-sim-bounces at lists.onebuilding.org] On Behalf Of James V.
Dirkes II P.E.
Sent: Monday, February 09, 2009 7:30 AM
To: 'Eric Studer'; bldg-sim at lists.onebuilding.org
Subject: Re: [Bldg-sim] Infiltration Schedule
Dear Andy and Eric,
My past experience with industrial buildings (manufacturing, assembly,
warehouses, etc) indicates that a good building has an AVERAGE winter
AC/hr of ~0.2. Poor buildings are on the order of 0.5 (or more!)
This doesn't address residences (which often have much higher
infiltration rates) offices or high rises, but it may be helpful. Most
of the literature I'm familiar with indicates that infiltration is
normally a lot higher than is generally assumed. My experience confirms
that.
The Building Performance Team
James V. Dirkes II, P.E., LEED AP
1631 Acacia Drive NW
Grand Rapids, MI 49504
616 450 8653
________________________________
From: bldg-sim-bounces at lists.onebuilding.org
[mailto:bldg-sim-bounces at lists.onebuilding.org] On Behalf Of Eric Studer
Sent: Monday, February 09, 2009 6:42 AM
To: bldg-sim at lists.onebuilding.org
Subject: Re: [Bldg-sim] Infiltration Schedule
I tend to model an air exchange rate of 0.15 ACH in perimeter
spaces during unoccupied hours (e.g. outside air fans are off with
dampers closed) for new buildings (even if they have air barriers).
Vestibules, conditioned loading docks, etc usually get higher air change
rates. Zones with no exterior exposure should not be modeled as having
any infiltration since there is not a way for air at outside conditions
to make it to these zones. I assume no infiltration into plenum zones.
I am curious to know whether or not this seems reasonable based
on real world experience. Andy, any thoughts?
Thanks,
Eric
Ph: (781) 431-1100 ext 12
Fax: (781) 431-1109
________________________________
From: bldg-sim-bounces at lists.onebuilding.org
[mailto:bldg-sim-bounces at lists.onebuilding.org] On Behalf Of Andy hoover
Sent: Friday, February 06, 2009 5:07 PM
To: 'Talbert, Joshua'; bldg-sim at lists.onebuilding.org
Subject: Re: [Bldg-sim] Infiltration Schedule
Hi all:
We do building envelope consulting and are very curious as to
what folks do and what rates they use whatever approach. When looking
at buildings we find that most infiltrate much more in the real world
than designers estimate and that the fluctuations are far greater than
predicted. We would also love it if anyone has any experiences which
can be shared.
Thanks,
Andy
Andy Hoover
Principal
The BEST Consultant, Inc.
Office: 678-200-7648
Fax:678-827-0574
Cell: 678-793-1159
www.thebestconsultant.com
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From: bldg-sim-bounces at lists.onebuilding.org
[mailto:bldg-sim-bounces at lists.onebuilding.org] On Behalf Of Talbert,
Joshua
Sent: Friday, February 06, 2009 10:30 AM
To: bldg-sim at lists.onebuilding.org
Subject: [Bldg-sim] Infiltration Schedule
Howdy Bldg Sim peers!
While working on LEED Equest simulations I find that in an
effort to simplify I end up deleting the P-Inf and C-Inf Infiltration
Schedules all of the time and end just use "undefined" to simulate a
constant infiltration rate. I was curious to know if anyone uses the
actual Infiltrations schedules, to emulate winds and or building
pressurization, and if so do you typically achieve more energy savings,
and do you find it worth the extra effort?
Thanks all and be well.
Josh
Joshua W. Talbert P.E., LEED-AP
Mechanical Engineer
Hallam///ICS
38 Eastwood Dr. Suite 200
S. Burlington, VT 05403
P: (802) 658-4891
F: (802) 658-1457
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