[bldg-sim] High Performance Glazing

[Abaza, Hussein]

The ultimate solution could be the reversible windows (under research). The concept of the Low-E reversible window is to flip the glass window in winter so the low-E coat will be on the 2nd surfaces and in summer on the 3rd surface ( counting surfaces from inside)
 
 
sim at gard.com on behalf of Jeff Haberl
Sent: Thu 12/15/2005 8:48 PM
To: bldg-sim at gard.com
Subject: [bldg-sim] High Performance Glazing



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
BB 8=!  8=)  :=)  8=)  ;=)  8=)  8=(  8=)  :=')  8=)  8=)  8=? BB

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

BB 8=/  8=)  :=)  8=)  ;=)  8=)  8=()  8=) 8=?  8=)  8=)  8= BB


-----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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