[Bldg-sim] Infiltration Schedule

[Eric Studer]

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

 

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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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