[Trace-users] Impact of Overhangs

[Scott Parker]

Fareed,

I don't have any "good research data", but from my simulation experience the overall wall U-value is very important to the energy use related to the building envelope.  The shading does not improve the U-value.  If you are comparing to ASHRAE 90.1, then the maximum glazing percentage is 40%.  Any glazing beyond this point in the proposed building would be compared to solid wall in the baseline.  

If this is the case, then the comparison of glazing to solid wall for the percentage over 40% glazing will definitely hurt your energy savings.  The SHGC of solid wall is 0, and the U-value is 10 times better than insulated windows.

Scott

SCOTT PARKER  PE, LEED AP MECHANICAL SYSTEMS AEI | AFFILIATED ENGINEERS, INC.  
1414 Raleigh Rd., Suite 305 | Chapel Hill, NC  27517
P: 919.419.9802 | 
sparker at aeieng.com  |  www.aeieng.com  



>>> On 2/5/2010 at 3:52 PM, in message <ED7080B522E32144AAB0B0B3FFFFBB14BF65BF at exchange2.progressiveae.com>, "Fareed Syed" <syedf at progressiveae.com> wrote:

Folks,
 
Does anyone have good research data using simulations on the impact of overhangs and shadings for a typical building?
 
I am having hard time convincing architects to reduce the glazing. They will make it a glass building if they are given a chance.
 
I want to show them that for a 2 or 3 storied building with ton of glazing and few feet of overhang will not help the cooling/heating loads at all.
 
I would appreciate your input.
 
Thanks much.
 
 
Fareed Syed EIT, LEED® AP
Mechanical Engineer 

1811 4 Mile Rd NE
Grand Rapids, MI  49525
 
Phone: 616.361.2664 ext. 3247
Direct: 616.447.3447
Fax: 616.361.1493
syedf at progressiveae.com
www.progressiveae.com


  
 
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