[Equest-users] Window replacement and infiltration rate changing

Carol Gardner cmg750 at gmail.com
Wed Sep 15 14:56:41 PDT 2010


Wow! It seems like 1 cfm/sf for infiltration would be a lot. The people's
hair next to the windows would be blowing all around! That's the average
number I use for HVAC ventilation.

Carol

On Wed, Sep 15, 2010 at 2:36 PM, Alex Krickx
<akrickx at seriousmaterials.com>wrote:

>  Hi Yingqi,
>
>
>
> I’m pretty sure eQUEST does not automatically adjust infiltration rates.
>
>
>
> If you search through the archives and look up “infiltration windows” you
> can find some relevant posts. I’ve attached one email that was sent around
> earlier this year describing one way to change the infiltration between
> current and proposed cases.
>
>
>
> I don’t think you can apply a percentage reduction without some more
> information. I believe that the requirement to meet the DOE’s VPP for
> windows is a maximum infiltration of 0.3 CFM/SF – this leads me to believe
> that some new windows have more infiltration than this. My company
> manufacturers windows with infiltrations as low as 0.01 CFM/SF. I’m having a
> hard time finding a source, but I’m pretty sure I’ve heard of modeling
> existing windows with infiltration as high as 1 CFM/SF. A building with a
> large WWR and very leaky windows could substantially reduce whole-building
> infiltration values.
>
>
>
> Good luck!
>
> Alex Krickx
>
>
>
>
>
> Alex Krickx
>
> Building Energy Specialist
>
> [image: email_sig]
>
> 1250 Elko Dr, Sunnyvale, CA 94089
>
> (t) 408.541.8124
>
>
>
> *Warning:** The information contained in this e-mail may be privileged
> attorney-client communications or attorney work product and/or proprietary
> and confidential.  If the reader of this message is not the intended
> recipient then you have received it in error and any review, distribution or
> copying of this message is prohibited and you are to notify us immediately
> by reply e-mail and delete the original message immediately.*
>
>
>
>
>
>
>
> *From:* equest-users-bounces at lists.onebuilding.org [mailto:
> equest-users-bounces at lists.onebuilding.org] *On Behalf Of *Carol Gardner
> *Sent:* Wednesday, September 15, 2010 2:19 PM
> *To:* YingQi Chen
> *Cc:* equest-users at lists.onebuilding.org
> *Subject:* Re: [Equest-users] Window replacement and infiltration rate
> changing
>
>
>
> If eQUEST changed the infiltration between the two cases you would be able
> to see the change in your .inp deck. I'm not sure what the impact of doing
> the change using the EEM Wizard vs. simply copying and renaming your input
> deck and making the change in it's own .inp deck would be. You could
> experiment and see if there's a difference. If it doesn't change your
> infiltration I would lower the perimeter infiltration rate conservatively by
> a fixed percent. You might Google infiltration rates on line and find some
> information related to how much to expect for a single pane window to a
> double pane window. Also, be sure to account for your frames, too. Are they
> thermally broken? Does the frame material change, etc.
>
> Carol
>
> On Wed, Sep 15, 2010 at 2:05 PM, YingQi Chen <yingqi.chen at pertan.com>
> wrote:
>
> Dear eQuester:
>
>
>
> I want to run a simulation by EEM wizard. I want to replace exiting single
> pane, clear windows with double pane clear windows for a school building.
>
>
>
> I changed the class type form single pane clear to double pane clear
> windows.  The energy saving doesn’t look good.  I have two following
> questions need someone's guidance.
>
>
>
> *Question 1:*
>
>
>
> My question is that this EEM will reduce perimeter infiltration rate of the
> building. I am not quit sure if I need to reduce the perimeter infiltration
> rate in the simulation. If, it does, how many percentage of infiltration
> rate do I need to reduce?
>
>
>
> *Question 2:*
>
>
>
> Does eQuest programmer has already considered this issue and changed the
> perimeter infiltration rate automatically with changing window glass type
> and insulation of the windows?
>
>
>
> Yingqi Chen
>
>
>
> The PERTAN Group
> 44 Main Street, Suite
>
> Champaign, IL 61820
>
>
>
> 217-356-1348 ext 205
>
>
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>
>
>
> --
> Carol Gardner PE
>
>
> ---------- Forwarded message ----------
> From: Nick Caton <ncaton at smithboucher.com>
> To: Alex Krickx <akrickx at seriousmaterials.com>, "
> equest-users at lists.onebuilding.org" <equest-users at lists.onebuilding.org>
> Date: Mon, 8 Mar 2010 16:47:48 -0800
> Subject: RE: [Equest-users] Modeling Infiltration and Windows
>
> 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
>
> [image: cid:489575314 at 22072009-0ABB]**
>
> * *
>
> *NICK CATON, E.I.T.***
>
> PROJECT ENGINEER
>
> 25501 west valley parkway
>
> olathe ks 66061
>
> direct 913 344.0036
>
> fax 913 345.0617
>
> *Check out our new web-site @ *www.smithboucher.com* *
>
>
>
> *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
>
> [image: email_sig]
>
> 1250 Elko Dr, Sunnyvale, CA 94089
>
> (t) 408.541.8124
>
>
>
> *Warning:** The information contained in this e-mail may be privileged
> attorney-client communications or attorney work product and/or proprietary
> and confidential.  If the reader of this message is not the intended
> recipient then you have received it in error and any review, distribution or
> copying of this message is prohibited and you are to notify us immediately
> by reply e-mail and delete the original message immediately.*
>
>
>
>
>
>


-- 
Carol Gardner PE
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