[Bldg-sim] Regarding Trade-off method for building envelope performance factor, ASHRAE 90.1-2007

[Larry Degelman via Bldg-sim]

Hello Manasa,

I see your dilemma.  The 2010 version of 90.1 shows the FAF as a multiplier in equation (C-1), but with no definition.  It was well defined in the previous 2007 version as FAF = 1000/CFA (sq.ft.), where CFA is the total conditioned floor area, and is used in equation (C-2).  This definition was on page 116 of the 2007 version of 90.1.  In the 90.1-2013 version, neither the equation nor the FAF appear because the entire Appendix C has been replaced by a simulation methodology; thus no equations are shown.

However, if you still feel compelled to use the FAF, its definition is shown here in I-P units.

Regards,

============================
Larry Degelman, P.E.
Professor Emeritus of Architectiure
Texas A&M University
USA
============================




From: manasa lingamallu via Bldg-sim 
Sent: Monday, May 23, 2016 5:09 AM
To: bldg-sim at lists.onebuilding.org 
Subject: [Bldg-sim] Regarding Trade-off method for building envelope performance factor, ASHRAE 90.1-2007

Hello,

         I am Manasa Lingamallu pursuing 4th year at Building Science, IIIT Hyderabad. I am currently working on developing a tool that calculates Envelope Performance Factor (EPF) using Trade-off option. In this method I am supposed to use Floor area factor (FAF), for which I am unable to find its definition in ASHRAE. 

         Please could anyone help me by defining it and also by suggesting method to calculate FAF.



Thankyou.



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