[Equest-users] Window replacement and infiltration rate changing

[Alex Krickx]

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
[cid:image001.jpg at 01CB54E3.594C67C0]
1250 Elko Dr, Sunnyvale, CA 94089
(t) 408.541.8124

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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<mailto: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
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