[Bldg-sim] Infiltration

[James V Dirkes II, PE]

Dear Wookey,

A blower door test is probably the best way to get a good idea of
infiltration / leakage.  It is, however, an extrapolation of a VERY limited
test.  If you limit your test buildings to small and "airtight" (i.e.,
constructed purposefully by a knowledgeable contractor to be tight) and the
HVAC system does not affect the building pressure, the blower door probably
does a good job.  I was thinking of a much broader type of building.  

The Building Performance Team
James V. Dirkes II, P.E., LEED AP
1631 Acacia Drive NW
Grand Rapids, MI 49504
616 450 8653
 

-----Original Message-----
From: bldg-sim-bounces at lists.onebuilding.org
[mailto:bldg-sim-bounces at lists.onebuilding.org] On Behalf Of Wookey
Sent: Friday, July 02, 2010 11:28 AM
To: bldg-sim at lists.onebuilding.org
Subject: Re: [Bldg-sim] Infiltration

+++ James V Dirkes II, PE [2010-07-02 09:47 -0400]:
> Amen to that!  
> 
> Stated another way, almost anyone who thinks they know (with any
precision) the
> infiltration rate of any building is misinformed.

Do you not feel that door blower tests on small, airtight domestic
buildings, as required for passivhaus certification, are not
reasonably accurate?

I quite agree that for large or very leaky buildings there is a real
problem, but I don't agree that there is no such thing as
sufficiently-accurate testing, and the passivehaus people are nothing
if not careful and rigorous about the science. 

Wookey
-- 
Principal hats:  Linaro, Emdebian, Wookware, Balloonboard, ARM
http://wookware.org/
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