[Bldg-sim] Infiltration Schedule
James V. Dirkes II P.E.
jvd2pe at tds.net
Mon Feb 9 04:30:15 PST 2009
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
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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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