[BLDG-SIM] 90.1-2004 ASHRAE Basecase

Apply caution here, because F-values are conductance per lineal foot and not per square foot. They are meant to apply to slab perimeters and not floor slab areas. You would incur significant errors if you multiply F-values by areas. C-values are basically the same as U-values, but without outside surface conductance coefficients (like air films).

Regards,

LOD

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Larry O. Degelman, P.E. ldegelman@xxxxxxxxxxxxxx

Professor Emeritus of Architecture 1-979-696-2506

Texas A&M University

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-----Original Message-----
From: BLDG-SIM@xxxxxxxx [mailto:BLDG-SIM@xxxxxxxx] On Behalf Of Aulbach, John
Sent: Monday, March 05, 2007 5:01 PM
To: BLDG-SIM@xxxxxxxx
Subject: [BLDG-SIM] 90.1-2004 ASHRAE Basecase

ASHRAE 90.1-2004, page 7 - Definition of F-Factor (loss through slab-on-grade floor), page 6 - Definition of C-Factor (loss through underground wall). Note units are the same as U-Value. I believe you use them for the same purpose as U-Factor, except your outside medium isn't air, it is dirt.

From: BLDG-SIM@xxxxxxxx [mailto:BLDG-SIM@xxxxxxxx] On Behalf Of Steve Mignogna
Sent: Monday, March 05, 2007 2:37 PM
To: BLDG-SIM@xxxxxxxx
Subject: [BLDG-SIM] 90.1-2004 ASHRAE Basecase

Hello,

I had a question regarding setting up a baseline model based on the ASHRAE 90.1-2004 standard. For the envelope requirements, the required values for the "Slab on Grade Flrs" and "Below Grade Walls" are in terms of "F-values" and "C-values" respectively. Since eQuest only takes the U or R values as inputs, I was wondering how these F and C values corresponded to them. Any help would be greatly appreciated.

Regards,

--
Steve Mignogna
Atelier Ten

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