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<DIV dir=ltr lang=en-us class=OutlookMessageHeader align=left><SPAN
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face=Calibri>Bob,</FONT></SPAN></DIV>
<DIV dir=ltr lang=en-us class=OutlookMessageHeader align=left><SPAN
class=990432013-31052012><FONT color=#0000ff face=Calibri>What is the project
location and how is the building oriented? Do these louvers run across the
entire height of the building?</FONT></SPAN></DIV>
<DIV dir=ltr lang=en-us class=OutlookMessageHeader align=left><SPAN
class=990432013-31052012><FONT color=#0000ff face=Calibri>If you have a
heavily internal load dominated (office) building, the building skin effect
might be minimal, but then again the shading design</FONT></SPAN></DIV>
<DIV dir=ltr lang=en-us class=OutlookMessageHeader align=left><SPAN
class=990432013-31052012><FONT color=#0000ff face=Calibri>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. </FONT></SPAN></DIV>
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<DIV dir=ltr lang=en-us class=OutlookMessageHeader align=left><FONT size=2
face=Tahoma><B>From:</B> equest-users-bounces@lists.onebuilding.org
[mailto:equest-users-bounces@lists.onebuilding.org] <B>On Behalf Of </B>Bobby
Sy<BR><B>Sent:</B> Wednesday, May 30, 2012 10:19 PM<BR><B>To:</B>
equest-users@lists.onebuilding.org<BR><B>Subject:</B> [Equest-users] building
shade effect<BR></FONT><BR></DIV>
<DIV></DIV>
<DIV>Hello everyone!</DIV>
<DIV> </DIV>
<DIV>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.</DIV>
<DIV> </DIV>
<DIV>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:
<H5><FONT color=#666600>TRANSMITTANCE</FONT></H5><FONT color=#666600></FONT>
<P class=MsoBodyText><FONT color=#666600>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.</FONT></P></DIV>
<DIV> </DIV>
<DIV>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? </DIV>
<DIV> </DIV>
<DIV> </DIV>
<DIV>Thanks,</DIV>
<DIV> </DIV>
<DIV>Bob</DIV></BODY></HTML>