[Equest-users] building shade effect

Umesh Atre umesh at innovativedesign.net
Thu May 31 06:30:01 PDT 2012

What is the project location and how is the building oriented? Do these
louvers run across the entire height of the building?
If you have a heavily internal load dominated (office) building, the
building skin effect might be minimal, but then again the shading design
you have in this project looks pretty dense and assuming you have a need
for cooling, my gut feeling is that 1% is on the lower side. 

From: equest-users-bounces at lists.onebuilding.org
[mailto:equest-users-bounces at lists.onebuilding.org] On Behalf Of Bobby
Sent: Wednesday, May 30, 2012 10:19 PM
To: equest-users at lists.onebuilding.org
Subject: [Equest-users] building shade effect

Hello everyone!
I am working on a project, a high rise office building. The architect
added louvers as part of the design which I admire for sophistication.
Attached is a picture that shows the louvers outside for shading. But,
when I did the initial run, the effect of the louvers is only around 1%
energy improvement from the baseline.
Please let me know if there is a better way to do it in eQuest. What I
did was to measure the louver thickness and proportioned it to the glass
area that it covers. I put the fraction as "Transmittance:" in Building
and Fixed Shades properties. Doe 2 help says: 


Fraction of incident solar radiation that is transmitted by the shading
surface. The default value is 0.0, which means the surface is opaque. A
value greater than 0.0 represents a device that passes some solar
radiation, such as a tree, lattice, or fabric. Using SHADE-SCHEDULE
allows seasonal variation in transmittance. Daylighting calculation
assumes TRANSMITTANCE = 0.

The design team quite find it hard to believe that the louvers have very
minimal effect. I told them to consider the window to wall ratio (almost
60%) and that fact that they will be using a clear glass, even with
these louvers partial UV rays still pass through the gaps that spreads
allover the glass surface that adds to the heat load for air
conditioning. Ive noticed to some of my other projects in tropical
countries, building shades don't have much effect to energy efficiency.
Did anyone encounter the same result with building shades? 
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