[BLDG-SIM] Interior Thermal mass in App G baseline

[Leonard Sciarra]

Fred,
(90.1-2004)Appendix G, table G3.1, section 5 on right side under
baseline opaque assemblies, for floor it says to model as steel joist.
So yes, by modeling your proposed design with concrete you do get the
benefit of MASS.
 

Leonard Sciarra, AIA, LEED ap

312.577.6580 (Dir)

G E N S L E R | Architecture & Design Worldwide

30 West Monroe Street

Chicago IL, 60603

312.456.0123

leonard_sciarra at gensler.com 

 

________________________________

From: BLDG-SIM at gard.com [mailto:BLDG-SIM at gard.com] On Behalf Of Fred
Porter
Sent: Tuesday, September 04, 2007 4:48 PM
To: BLDG-SIM at gard.com
Subject: [BLDG-SIM] Interior Thermal mass in App G baseline



Does anyone have an opinion, or sense of the intent on the following: 

  

App G is fairly clear that the baseline EXTERIOR walls are
"lightweight," and metal-framed. Floors & walls are mentioned, but
referenced to exterior ENVELOPE constructions and U-factors. 

  

The U-M states the "baseline building is assumed to be steel-framed,"
but then goes on to state "if the proposed building has thermal mass in
the EXTERIOR construction... then the mass is credited." 

  

So, if a proposed building has poured concrete frame and floors,
can/should the baseline building be modeled with "light weight," "steel
joist" interior floors? Or is this a characteristic which is not
specifically defined for the baseline, and thus the baseline should be
the same as the proposed? 

  

-- 

Fred Porter 

Architectural Energy Corp. 

  

  


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