[Equest-users] Infiltration of Baseline model (UNCLASSIFIED)

[Jenny Zhang]

Interesting topic!
In ASHRAE 90.1 5.4.3.3 Fenestration and doors: air leakage shall not exceed 2.0L/s m2 for all other products(curtain walls I think). I refer to NFRC400 and the test delta pressure is 75pa. In China the grading standard of curtain wall air tightness is under 10 delta pressure. The 2.0L/s m2(75Pa) is equal to 0.522L/Sm2(10[a) which is much worse than China GB standard(0.278L/sm2, 10pa) However in other sections like chiller cop or lighting Power ASHRAE standard are much more strict than China GB code.
Do American people prefer to live with more air infiltration? It confuse me for a long time.

Jie Z

-----Original Message-----
From: equest-users-bounces at lists.onebuilding.org [mailto:equest-users-bounces at lists.onebuilding.org] On Behalf Of Nathan Miller
Sent: 2012年4月17日 23:13
To: 'Eurek, John S NWO'; Equest-users at lists.onebuilding.org
Subject: Re: [Equest-users] Infiltration of Baseline model (UNCLASSIFIED)

Oh please, what an over reaction. 

As an industry we are very in the dark about reasonable/typical
infiltration rates. I suspect any model reviewer, GBCI or otherwise would
have a difficult time assessing if the claimed savings due to improved air
barrier, or whatever strategy is implemented, are reasonable, especially
given that there is no clear baseline established by 90.1. 

However, you could always put forward a well reasoned argument with back
up data and studies and it is possible that the reviewer will allow you
take credit. Cite some reputable sources. Submit it as an Exceptional
Calculation Methodology with the  claimed savings separated out from the
rest of your model so it can be discretely evaluated.

Here is Seattle the city is requiring new projects to conduct full
building air leakage testing prior to occupancy with the city receiving
the results as part of a data collection effort, presumably so that they
can set reasonable requirements for air leakage in the future. Maybe this
data can work its way into an upcoming 90.1 cycle and we can all have a
more reasonable approach for modeling air leakage.

Nathan Miller, PE, LEED AP BD+C
Mechanical Engineer/Senior Energy Analyst
O 206-285-7100 | D 206-788-4577
www.rushingco.com

-----Original Message-----
From: equest-users-bounces at lists.onebuilding.org
[mailto:equest-users-bounces at lists.onebuilding.org] On Behalf Of Eurek,
John S NWO
Sent: Tuesday, April 17, 2012 7:33 AM
To: Equest-users at lists.onebuilding.org
Subject: Re: [Equest-users] Infiltration of Baseline model (UNCLASSIFIED)

Classification: UNCLASSIFIED
Caveats: NONE

So LEED doesn't want to promote building built with strict air tightness? 

Did the air tightness industry not pony up as much cash as the bike rack
industry?

Our architects have been working on writing up an air tightness spec and
researching best construction methods and air testing methods.  I'll let
them know they can stop.

John Eurek

-----Original Message-----
From: equest-users-bounces at lists.onebuilding.org
[mailto:equest-users-bounces at lists.onebuilding.org] On Behalf Of Jenny
Zhang
Sent: Tuesday, April 17, 2012 2:34 AM
To: Jiao, Joey; Equest-users at lists.onebuilding.org
Subject: Re: [Equest-users] Infiltration of Baseline model

Joey, you are correct! I have receive comments from GBCI on a LEED EA
project. The baseline model’s infiltration should be the same as the
proposed model.

 

 

From: equest-users-bounces at lists.onebuilding.org
[mailto:equest-users-bounces at lists.onebuilding.org] On Behalf Of Jiao,
Joey
Sent: 2012年4月16日 17:27
To: Equest-users at lists.onebuilding.org
Subject: [Equest-users] Infiltration of Baseline model

 

Hi, Everyone:

Is there any request about baseline model’s infiltration?

I have check all appendix G items, but it seems this area is blank.

If the infiltration must be the same between baseline & purposed?

Any light on it will be appreciated.

 

Thank you.

 

Joey.

 

 

--------------------------------------------------------------------------
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Joey Jiao

Graduate Engineer
Shanghai WSP Consulting Ltd. (Shenzhen Branch)

Room 406, Wan Tong Da Sha, 3002 Sun Gang Road East, Luo Hu, Shenzhen,
518023, PRC 

Tel:  +86 755 25860686 

Fax: +86 755 25860680 
Website: www.wspgroup.hk


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