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

[Zhen Tian]

Thank you for your response,  Larry and Bing.
   
  Actually my question is, what is the number that I should set for the Infiltarion rate in the ASHRAE 90.1-2004 complianec base case model.
   
  The building envelope has 50% window to wall wall ratio (innore the door). So if we model the base case with 2L/s.m2 per window area, then we can set the infiltration rate as 1 L/s.m2 per exterior wall area in the base case. Is this method applicalbe?
   
  Regards,
   
  David
  

Larry Degelman <ldegelman at suddenlink.net> wrote:
        

    v\:* {behavior:url(#default#VML);}  o\:* {behavior:url(#default#VML);}  w\:* {behavior:url(#default#VML);}  .shape {behavior:url(#default#VML);}                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.         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

    
    
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