[bldg-sim] High Performance Glazing

[Jeff Haberl]

These results are consistent with our simulations, since the low-e reduces useful winter solar heat gain if installed on the 3rd surface, or modeled with SC. To model this more accurately you would need a W5 file for specific northern low-e window, and CWFs. 

Jeff 
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Jeff S. Haberl, Ph.D., P.E.............................jhaberl at esl.tamu.edu

Professor......................................................Office Ph: 979-845-6507

Department of Architecture.......................Lab Ph: 979-845-6065 

Energy Systems Laboratory.......................FAX: 979-862-2457 

Texas A&M University..............................77843-3581

College Station, Texas, USA.......................URL: www-esl.tamu.edu

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-----Original Message-----
From: bldg-sim at gard.com <bldg-sim at gard.com>
To: bldg-sim at gard.com <bldg-sim at gard.com>
Sent: Thu Dec 15 14:52:43 2005
Subject: [bldg-sim] High Performance Glazing

I am modeling high performance glazing with U=0.14, SC=0.35 and comparing to typical 1" thick insulating low-e glass with U=0.33, SC=0.76.  Climate is midwest US and 86% of the glass is facing north. The north wall is basically all glass and spandrel. Heating is suppied from district steam supply.

Results show increased steam energy consumption from February through September with high performance glazing and less for remaining winter months. HVAC system is VAV with hot water reheat coils.

Overall annual steam energy consumption reduction is very small. I expected to see significant heating energy savings due to increased perimeter R-value. Has anyone modeled high performance glazing and seen similar results? 


Mark Zoeteman 
FTC&H, Inc. 
(616) 464-3739 
mrzoeteman at ftch.com 




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