[BLDG-SIM] Infiltration rate in ASHRAE 90.1-2004

[Larry Degelman]

David,
 
It's possible that the sources you referenced are looking at two
different situations.  The ASHRAE section 5.4.3.2 addresses only
fenestration and door products, whereas the eQuest defaults are probably
for the entire wall.  A standard sheet-rocked walls air permeance rate
is around 0.004 cfm/s.f., while the Section 5.4.3.2 rate for
fenestration products is 0.4 cfm/s.f. (100 times greater.)  It would
make sense that the entire wall (after average weighting these surfaces)
might be around 0.04 cfm/s.f.  I don't believe that ASHRAE 90.1
addresses the entire wall infiltration rate (just joint sealing and
fenestration products.)
 
LOD
================================================
Larry O. Degelman, P.E.          <mailto:ldegelman at suddenlink.net>
ldegelman at suddenlink.net
Professor Emeritus of Architecture     1-979-696-2506
Texas A&M University
===============================================
-----Original Message-----
From: BLDG-SIM at gard.com [mailto:BLDG-SIM at gard.com] On Behalf Of Zhen
Tian
Sent: Wednesday, June 13, 2007 1:30 AM
To: BLDG-SIM at gard.com
Subject: [BLDG-SIM] Infiltration rate in ASHRAE 90.1-2004
 
Dear all,
 
I have a question about the infiltration rate in the ASHRAE 90.1-2004.
As we simulate the base case building energy use, we try to find out
what is the reference infiltration rate setup up by ASHRAE 90.1-2004.
However, we only find in section 5.4.3.2 (page 180) value is "2.0 L/s.m2
for other products". When we use e-QUEST to simulate the building energy
use, we found that the default infiltration rate is set as 0.038 CFM/ft2
for exterior wall area, which is about 0.2 L/s.m2 per exterior wall
area.
 
Could somebody tell me what is the reference infiltration rate per
square exterior wall area based on ASHRAE 90.1-2004.
 
Thank you very much for your help in advance.
 
Regards,
 
David
  
  _____  

Looking for a deal? Find
<http://us.rd.yahoo.com/evt=47094/*http:/farechase.yahoo.com/;_ylc=X3oDM
TFicDJoNDllBF9TAzk3NDA3NTg5BHBvcwMxMwRzZWMDZ3JvdXBzBHNsawNlbWFpbC1uY20->
great prices on flights and hotels with Yahoo! FareChase.


======================================================
You received this e-mail because you are subscribed 
to the BLDG-SIM at GARD.COM mailing list.  To unsubscribe 
from this mailing list send a blank message to 
BLDG-SIM-UNSUBSCRIBE at GARD.COM
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.onebuilding.org/pipermail/bldg-sim-onebuilding.org/attachments/20070613/92038317/attachment-0008.htm>