[BLDG-SIM] Materials properties for simulation

[Michael J. Witte]

Chip:

The EnergyPlus materials data sets are taken from the BLAST and DOE-2 
data sets which were taken primarily from AHSRAE HOF tables, most 
likely the 1977 edition.

Looking at the 1977 ASHRAE HOF, there are no specific sources cited 
in the tables, although there are some ASHVE papers and some books 
listed in the bibliography.  The footnotes in the table point to the 
manufacturer as the ultimate source.  So, I poked around USG's 
website and found very little to help.  Density is generally 
available, and thermal resistance is available for some products, but 
I found no mention of specific heat, so that's not going to be much 
help.  This is an interesting question.  Please report you conclusion 
back to us here.

Have you looked in the popular architectural reference named 
something like Mechanical and Electrical in Buildings (I think it's 
usually referred to as MEB or something like that)?

Mike


On 12 Nov 2003, at 10:25, Chip Barnaby wrote:

> Dear all --
> 
> I am working on ASHRAE 1199-RP, "Updating the ASHRAE/ACCA Residential
> Loads Calculation Procedures and Data".
> 
> The revised method under development is based on a 24 hour design-day
> simulation using a heat balance model.
> 
> In order to fully "package" the method for end use, thermal properties
> values must be selected for a moderately inclusive set of construction
> materials.
> 
> There is often disagreement among all the common sources for materials
> properties (ASHRAE HOF tables, standard values built into simulation
> programs etc.).
> 
> For example, the specific heat of gypsum wall board is given as 1.09
> kJ/kg-K (0.26 Btu/lb-F) in ASHRAE 2001 HOF Chapter 25, Table 4 (and
> several other sources that I've found that cite ASHRAE).  There is no
> source given for this value (unless I'm missing something). 
> Meanwhile, the California Energy Commission has selected 0.837 kJ/kg-K
> (0.20 Btu/lb-F) as their standard value for compliance simulations,
> again without documentation.
> 
> For 1199-RP, I would like to resolve at least the glaring 
> discrepancies.  Beyond that, it would help the field if we could work
> toward a set of documented consensus values for common use.
> 
> Can anyone point me to authoritative sources for info that you have
> found helpful?
> 
> Chip Barnaby
> 
> 
> ---------------------------------------------------------
> Chip Barnaby                   cbarnaby at wrightsoft.com
> Vice President of Research
> Wrightsoft Corp.               781-862-8719 x118 voice
> 394 Lowell St, Suite 12        781-861-2058 fax
> Lexington, MA 02420            www.wrightsoft.com
> ---------------------------------------------------------
> 
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