[BLDG-SIM] Materials properties for simulation

Jon McHugh mchugh at h-m-g.com
Wed Nov 12 08:29:41 PST 2003


Chip,

Here are some sources:
Touloukian, Y. S. et al Thermophysical Properties of Matter, Plenum
Press, New York I think it is a 10 Volume set

The Canadian Rubber Company (CRC) has chemical handbooks that may have
many of these properties.

I just checked my copy of Incropera & DeWitt "Fundamentals of Heat and
Mass Transfer." Wiley & Sons, New York. It has thermophysical properties
in the Appendices and references a variety of sources including
Touloukian.  It has been a while since I looked at it but I think the
Touloukian series references the work which generated the thermophysical
data.

You might also talk to Fred Winklemann at LBNL about where they got
their data for DOE-2.  Presumably the EnergyPlus folks are updating
their material properties and can also share their sources.

Jon McHugh, PE, LC

-----Original Message-----
From: Chip Barnaby [mailto:cbarnaby at wrightsoft.com] 
Sent: Wednesday, November 12, 2003 7:26 AM
To: BLDG-SIM at gard.com
Subject: [BLDG-SIM] Materials properties for simulation


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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