<HTML><HEAD></HEAD>
<BODY dir=ltr>
<DIV dir=ltr>
<DIV style="FONT-SIZE: 12pt; FONT-FAMILY: 'Calibri'; COLOR: #000000">
<DIV>Hello Manasa,</DIV>
<DIV> </DIV>
<DIV>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the equation nor the FAF appear because the entire Appendix C has been replaced
by a simulation methodology; thus no equations are shown.</DIV>
<DIV> </DIV>
<DIV>However, if you still feel compelled to use the FAF, its definition is
shown here in I-P units.</DIV>
<DIV> </DIV>
<DIV>Regards,</DIV>
<DIV> </DIV>
<DIV>============================</DIV>
<DIV>Larry Degelman, P.E.</DIV>
<DIV>Professor Emeritus of Architectiure</DIV>
<DIV>Texas A&M University</DIV>
<DIV>USA</DIV>
<DIV>============================</DIV>
<DIV> </DIV>
<DIV> </DIV>
<DIV> </DIV>
<DIV
style='FONT-SIZE: small; TEXT-DECORATION: none; FONT-FAMILY: "Calibri"; FONT-WEIGHT: normal; COLOR: #000000; FONT-STYLE: normal; DISPLAY: inline'>
<DIV style="FONT: 10pt tahoma">
<DIV> </DIV>
<DIV style="BACKGROUND: #f5f5f5">
<DIV style="font-color: black"><B>From:</B> <A
title=bldg-sim@lists.onebuilding.org
href="mailto:bldg-sim@lists.onebuilding.org">manasa lingamallu via Bldg-sim</A>
</DIV>
<DIV><B>Sent:</B> Monday, May 23, 2016 5:09 AM</DIV>
<DIV><B>To:</B> <A title=bldg-sim@lists.onebuilding.org
href="mailto:bldg-sim@lists.onebuilding.org">bldg-sim@lists.onebuilding.org</A>
</DIV>
<DIV><B>Subject:</B> [Bldg-sim] Regarding Trade-off method for building envelope
performance factor, ASHRAE 90.1-2007</DIV></DIV></DIV>
<DIV> </DIV></DIV>
<DIV
style='FONT-SIZE: small; TEXT-DECORATION: none; FONT-FAMILY: "Calibri"; FONT-WEIGHT: normal; COLOR: #000000; FONT-STYLE: normal; DISPLAY: inline'>
<DIV dir=ltr>
<DIV>
<DIV>
<DIV>Hello,<BR></DIV> 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.
<BR></DIV> Please could anyone
help me by defining it and also by suggesting method to calculate
FAF.<BR><BR><BR></DIV>Thankyou.<BR></DIV>
<P>
<HR>
_______________________________________________<BR>Bldg-sim mailing
list<BR>http://lists.onebuilding.org/listinfo.cgi/bldg-sim-onebuilding.org<BR>To
unsubscribe from this mailing list send a blank message to
BLDG-SIM-UNSUBSCRIBE@ONEBUILDING.ORG<BR></DIV></DIV></DIV></BODY></HTML>