Re: [EnergyPlus_Support] Surface properties

["Michael J. Witte" <mjwitte@xxxxxxxx>]

I do not have any specific source to offer.  In general, I use the default of 
0.9 for Absorptance:Thermal unless there is specific information to tell you 
otherwise.  Visible and solar absorptance can vary, but there are so many 
factors that it is best to get data from the manufacturer.  If you are unable 
to find data, another appoach is to run two simulations using low and high 
values for these properties and see how sensitive the results are.

Mike



On 28 Jan 2008 at 8:31, antonia.labianca wrote:

> Hi, 
> I need to create these new materials: 
> 1. White plaster 
> 2. Aluminium (natural anodised) for louvres 
> 3. Aluminium painted with a white coat for louvres 
> 4. Cement plate for flat roof 
> but itâEUR?s difficult to find their surface properties (Thermal
> absorptance (emissivity) âEUR" Solar absorptance - visible absorptance) 
> 
> Is there a web site with these values or, if possibile, can you give
> me these values?
> Thank you very much 
> 
> Tonia
> 
> 
> 
> 
> The primary EnergyPlus web site is found at:
> http://www.energyplus.gov
> 
> The group web site is:
> http://groups.yahoo.com/group/EnergyPlus_Support/
> 
> Attachments are not allowed -- please post any files to the appropriate folder
> in the Files area of the Support Web Site.
> 
> EnergyPlus Documentation is searchable.  Open EPlusMainMenu.pdf under the
> Documentation link and press the "search" button.
> 
> Yahoo! Groups Links
> 
> 
> 
> 
> 


========================================================
Michael J. Witte, GARD Analytics, Inc.
EnergyPlus Testing and Support      
EnergyPlus-Support@xxxxxxxx





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