[Equest-users] Modeling Infiltration and Windows

[steve clark]

Hi Nick,

Do you have a reference for the ASHRAE ACH estiamtes you mentioned?

thanks!
Steve

On Mon, Mar 8, 2010 at 7:47 PM, Nick Caton <ncaton at smithboucher.com> wrote:

>  I’ve done exactly that in the past for the exactly the same purpose!
>
>
>
> The only difference is I believe I always punch in the differences in the
> metric of ACH.  ASHRAE fundamentals provides some guidance regarding air
> change rates to expect for various classes of construction as a function of
> outdoor design temperature, and that was the best I could base my existing
> construction off of from what info I had available.
>
>
>
> Come up with a  “leakiness” for both you construction, old and new windows,
> and do the weighted average jig =).
>
>
>
> Kudos on your fancy facade spelling also ;)!
>
>
>
> ~Nick
>
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>
> * *
>
> *NICK CATON, E.I.T.***
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> *From:* equest-users-bounces at lists.onebuilding.org [mailto:
> equest-users-bounces at lists.onebuilding.org] *On Behalf Of *Alex Krickx
> *Sent:* Monday, March 08, 2010 6:05 PM
> *To:* equest-users at lists.onebuilding.org
> *Subject:* [Equest-users] Modeling Infiltration and Windows
>
>
>
> Hello all,
>
>
>
> I am interested in modeling the energy savings that occurs when windows are
> replaced with lower-infiltration alternatives. In the wizard mode, the only
> place that I see infiltration is under the “Building Envelope Constructions”
>  Screen.
>
>
>
> I’m hoping someone can confirm my methodology:
>
>
>
> Can I input a weighted average of window and wall air infiltration here?
> If I’m looking at a building with 20% Window to Wall Ratio, and the windows
> have 0.1 CFM/ft² while the walls have 0.04 CFM/ft²can I apply an area
> weighted average into this box? I would take (20%*0.1+80%*0.04) as the *façade
> *infiltration value.
>
>
>
> That way I could use the same formula to determine the area weighted
> infiltration of the façade if better windows were installed.
>
>
>
> How do other people model this?
>
>
>
> Thanks in advance!
>
>
>
> Alex Krickx
>
>
>
>
>
> Alex Krickx
>
> Building Energy Specialist
>
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>
> 1250 Elko Dr, Sunnyvale, CA 94089
>
> (t) 408.541.8124
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-- 
Steve Clark, MS PhD RESNET BPI ITC
ClarkEnergyConsultants.com
484.477.7525
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