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

[Liu, Bing]

Tianzhen,
 
ASHRAE 90.1-2004 doesn't address the infiltration rate in terms of
infiltration rate per square foot of exterior wall area.  The default
value of 0.038 cfm/sf of exterior wall area in eQUEST may be derived
from the old ASHRAE Standard 1989 version.  It is always a challenge to
define the infiltration rate in the commercial buildings.  It is worthy
to read a field test report by NIST, titled as Analysis of Ventilation
Data from the U.S. Environmental Protection Agency Building Assessment
Survey and Evaluation (BASE) Study.  Here is the link to this report:
http://fire.nist.gov/bfrlpubs/build04/PDF/b04043.pdf
 
PNNL's Technical Support Document for the Development of the Advanced
Energy Design Guides also documented the infiltration rate assumptions
for both the baseline building (900.1-1999 version) and the advanced
cases. 
http://www.pnl.gov/main/publications/external/technical_reports/PNNL-160
31.pdf
http://www.pnl.gov/main/publications/external/technical_reports/PNNL-162
50.pdf
 
 
Hope it helps. 

Bing 
                                                   
Bing Liu, PE, CEM, LEED AP 
Senior Research Engineer 
Pacific Northwest National Laboratory 
902 Battelle Blvd, MSIN:K5-16 
Richland, WA 99352 
Tel:  (509) 375-3710 
Fax: (509) 375-3614 

 

________________________________

From: BLDG-SIM at gard.com [mailto:BLDG-SIM at gard.com] On Behalf Of Zhen
Tian
Sent: Tuesday, June 12, 2007 11:30 PM
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

________________________________

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