[Trace-users] Variable Shading Coefficient

[Phil_Grossman at URSCorp.com]

I have a 230,000 square feet, 400 room office building currently modeled 
in Trane Trace.  Fifty percent of the building’s exterior envelope is 
windows. The solar heat gain coefficient (SHGC) for the windows is 
currently modeled as a constant.  The goal is to use this model for LEED 
V3.0, EA Credit 1 - Optimize Energy Usage. 

The actual windows installed in the building are sunlight responsive 
thermochromic (SRT).  With SRT windows their SHGC changes as the intensity 
of incident solar radiation changes.   The SHGC is at minimum when the 
sun’s intensity is greatest.  When the window’s temperature is  77 ° F the 
SHGC is 0.29 at 149 ° F the SHGC is 0.18.  More information about this 
product is available at www.pleotint.com. 
It is my understanding that eQUEST  V3.55 can model variable tint windows 
based on total incident solar radiation, transmitted solar radiation or 
outdoor temperature.  Since the building is already modeled in Trace 
totally changing to eQUEST is considered impractical. 
I would like to know your experience and/or thoughts on how this building 
can be modeled with the SRT windows, preferably in Trace or possibly some 
combination of Trace and eQUEST.  The model needs to be accurate, 
acceptable to the LEED reviewer, and consume as little of my time as 
possible. 
Thank you in advance for your assistance.     


Phil Grossman, PE, LEED®AP, HFDP
Senior Mechanical Engineer


3950 Sparks Drive SE
Grand Rapids, MI 49546
Tel:  616.574.8500
Website   |   Map

Direct:  616.574.8451
Fax:  616.574.8542
Email:  Phil_Grossman at URSCorp.com
Please consider the environment before printing this email.




This e-mail and any attachments contain URS Corporation confidential 
information that may be proprietary or privileged. If you receive this 
message in error or are not the intended recipient, you should not retain, 
distribute, disclose or use any of this information and you should destroy 
the e-mail and any attachments or copies.



-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.onebuilding.org/pipermail/trace-users-onebuilding.org/attachments/20110627/e0ddf92f/attachment.htm>
-------------- next part --------------
A non-text attachment was scrubbed...
Name: not available
Type: image/gif
Size: 2263 bytes
Desc: not available
URL: <http://lists.onebuilding.org/pipermail/trace-users-onebuilding.org/attachments/20110627/e0ddf92f/attachment.gif>