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<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>Hi Erik,<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>I’m not familiar with the limitations/capabilities of the IES
Radiance tool (still looking for a vendor in the US that can send me some kind
of trial), but I may be able to offer some suggestions based on my limited daylight
modeling experience:<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoListParagraph style='text-indent:-.25in;mso-list:l0 level1 lfo1'><![if !supportLists]><span
style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><span
style='mso-list:Ignore'>-<span style='font:7.0pt "Times New Roman"'>
</span></span></span><![endif]><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>To clarify, is it 12% of your <u>wall</u> area that is windows?<o:p></o:p></span></p>
<p class=MsoListParagraph style='text-indent:-.25in;mso-list:l0 level1 lfo1'><![if !supportLists]><span
style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><span
style='mso-list:Ignore'>-<span style='font:7.0pt "Times New Roman"'>
</span></span></span><![endif]><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>Again, not sure of the IES Radiance’s operation, but when you
say ‘white’ floors/ceiling and ‘gray’ floors, what reflectances are being
modeled (i.e. 20/50/80%?)<o:p></o:p></span></p>
<p class=MsoListParagraph style='text-indent:-.25in;mso-list:l0 level1 lfo1'><![if !supportLists]><span
style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><span
style='mso-list:Ignore'>-<span style='font:7.0pt "Times New Roman"'>
</span></span></span><![endif]><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>Consider the hour/month being modeled, along with the orientation
and location on the globe. Perhaps you’re modeling an instant in time where
there is little-to-no direct sunlight on your glazing? <o:p></o:p></span></p>
<p class=MsoListParagraph style='text-indent:-.25in;mso-list:l0 level1 lfo1'><![if !supportLists]><span
style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><span
style='mso-list:Ignore'>-<span style='font:7.0pt "Times New Roman"'>
</span></span></span><![endif]><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>I am also approaching learning daylight modeling from an
energy-modeler’s perspective: For daylight studies, I try to give myself an
idea of what <u>should</u> be going on first before “crunching the numbers” by
building a simple model in Google Sketchup, located/oriented on the globe, and
playing with the simplified daylighting tools to see how the sun strikes the
building through the year. With practice I’m sure this will become more
intuitive, but until then I’ve learned not to rely on my intuitions!<o:p></o:p></span></p>
<p class=MsoListParagraph style='text-indent:-.25in;mso-list:l0 level1 lfo1'><![if !supportLists]><span
style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><span
style='mso-list:Ignore'>-<span style='font:7.0pt "Times New Roman"'>
</span></span></span><![endif]><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>A general heads-up that won’t solve your immediate concern: a visible
transmittance (what IES Radiance calls “transparency” may be something else) of
0.9 is not unheard of, but pretty high for exterior envelope glazing… when I do
daylighting/rendering studies I usually go no higher than 0.8 or so unless I
have actual product specs in hand.<o:p></o:p></span></p>
<p class=MsoListParagraph><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>~Nick<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><img width=119 height=37 id="Picture_x0020_1"
src="cid:image001.jpg@01CA4026.8CBBC010" alt="cid:489575314@22072009-0ABB"></span><b><span
style='font-size:11.0pt;font-family:"Stylus BT","sans-serif";color:#2D4D5E'><o:p></o:p></span></b></p>
<p class=MsoNormal><b><span style='font-size:11.0pt;font-family:"Stylus BT","sans-serif";
color:#2D4D5E'><o:p> </o:p></span></b></p>
<p class=MsoNormal><b><span style='font-size:11.0pt;font-family:"Stylus BT","sans-serif";
color:#2D4D5E'>NICK CATON, E.I.T.</span></b><b><span style='font-family:"Stylus BT","sans-serif";
color:#2D4D5E'><o:p></o:p></span></b></p>
<p class=MsoNormal><span style='font-size:7.5pt;font-family:"Calibri","sans-serif";
color:#CC9900'>PROJECT ENGINEER</span><span style='font-size:7.5pt;color:#CC9900'><o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Calibri","sans-serif";
color:#2D4D5E'>25501 west valley parkway<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Calibri","sans-serif";
color:#2D4D5E'>olathe ks 66061<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Calibri","sans-serif";
color:#2D4D5E'>direct 913 344.0036<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Calibri","sans-serif";
color:#2D4D5E'>fax 913 345.0617<o:p></o:p></span></p>
<p class=MsoNormal><i><span style='font-size:10.0pt;font-family:"Calibri","sans-serif";
color:#2D4D5E'>Check out our new web-site @ </span></i><span style='font-size:
11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><a
href="www.smithboucher.com" title="blocked::www.smithboucher.com"><span
style='font-size:10.0pt'>www.smithboucher.com</span></a></span><u><span
style='font-size:10.0pt;font-family:"Calibri","sans-serif";color:blue'> </span></u><span
style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
<div style='border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0in 0in 0in'>
<p class=MsoNormal><b><span style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'>From:</span></b><span
style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'>
virtual-sim-bounces@lists.onebuilding.org
[mailto:virtual-sim-bounces@lists.onebuilding.org] <b>On Behalf Of </b>Erik
Eriksson<br>
<b>Sent:</b> Monday, September 28, 2009 10:10 AM<br>
<b>To:</b> Paul Carey<br>
<b>Cc:</b> virtual-sim@lists.onebuilding.org<br>
<b>Subject:</b> Re: [Virtual-sim] Low DF-values with Radiance<o:p></o:p></span></p>
</div>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal style='margin-bottom:12.0pt'><br>
<span style='font-size:10.0pt;font-family:"Arial","sans-serif"'>Hey,</span> <br>
<br>
<span style='font-size:10.0pt;font-family:"Arial","sans-serif"'>Yeah, I've
tried that. With more or less the same result.<br>
I'm quite new to this with lighting calculations. I'm more used to energy
performance. </span><br>
<span style='font-size:10.0pt;font-family:"Arial","sans-serif"'>So I cant
really say if the values are correct or not.</span> <br>
<br>
<span style='font-size:10.0pt;font-family:"Arial","sans-serif"'>Best regards</span>
<br>
<br>
<span style='font-size:10.0pt;font-family:"Arial","sans-serif"'>E r i k
E r i k s s o n <br>
<br>
Energy specialist and project manager<br>
________________________________<br>
White project & environmental management<br>
<br>
Box 4700<br>
116 92 STOCKHOLM<br>
Phone: +46(0)8-402 26 77<br>
Fax: +46 (0)8-402 25 10<br>
Visit: Östgötagatan 100<br>
</span><a href="http://www.white.se/"><span style='font-size:10.0pt;font-family:
"Arial","sans-serif"'>http://www.white.se</span></a><span style='font-size:
10.0pt;font-family:"Arial","sans-serif"'><br>
<br>
We are certified according to ISO 9000 and 14 001</span> <br>
<br>
<o:p></o:p></p>
<table class=MsoNormalTable border=0 cellpadding=0 width="100%"
style='width:100.0%'>
<tr>
<td valign=top style='padding:.75pt .75pt .75pt .75pt'>
<p class=MsoNormal><span style='font-size:7.5pt;font-family:"Arial","sans-serif";
color:#5F5F5F'>From:</span> <o:p></o:p></p>
</td>
<td valign=top style='padding:.75pt .75pt .75pt .75pt'>
<p class=MsoNormal><span style='font-size:7.5pt;font-family:"Arial","sans-serif"'>Paul
Carey <paul@zed-uk.com></span> <o:p></o:p></p>
</td>
</tr>
<tr>
<td valign=top style='padding:.75pt .75pt .75pt .75pt'>
<p class=MsoNormal><span style='font-size:7.5pt;font-family:"Arial","sans-serif";
color:#5F5F5F'>To:</span> <o:p></o:p></p>
</td>
<td valign=top style='padding:.75pt .75pt .75pt .75pt'>
<p class=MsoNormal><span style='font-size:7.5pt;font-family:"Arial","sans-serif"'>Erik
Eriksson <erik.eriksson@white.se></span> <o:p></o:p></p>
</td>
</tr>
<tr>
<td valign=top style='padding:.75pt .75pt .75pt .75pt'>
<p class=MsoNormal><span style='font-size:7.5pt;font-family:"Arial","sans-serif";
color:#5F5F5F'>Cc:</span> <o:p></o:p></p>
</td>
<td style='padding:.75pt .75pt .75pt .75pt'>
<p class=MsoNormal><span style='font-size:7.5pt;font-family:"Arial","sans-serif"'>"virtual-sim@lists.onebuilding.org"
<virtual-sim@lists.onebuilding.org></span> <o:p></o:p></p>
</td>
</tr>
<tr>
<td valign=top style='padding:.75pt .75pt .75pt .75pt'>
<p class=MsoNormal><span style='font-size:7.5pt;font-family:"Arial","sans-serif";
color:#5F5F5F'>Date:</span> <o:p></o:p></p>
</td>
<td valign=top style='padding:.75pt .75pt .75pt .75pt'>
<p class=MsoNormal><span style='font-size:7.5pt;font-family:"Arial","sans-serif"'>2009-09-28
17:06</span> <o:p></o:p></p>
</td>
</tr>
<tr>
<td valign=top style='padding:.75pt .75pt .75pt .75pt'>
<p class=MsoNormal><span style='font-size:7.5pt;font-family:"Arial","sans-serif";
color:#5F5F5F'>Subject:</span> <o:p></o:p></p>
</td>
<td valign=top style='padding:.75pt .75pt .75pt .75pt'>
<p class=MsoNormal><span style='font-size:7.5pt;font-family:"Arial","sans-serif"'>Re:
[Virtual-sim] Low DF-values with Radiance</span><o:p></o:p></p>
</td>
</tr>
</table>
<p class=MsoNormal><o:p> </o:p></p>
<div class=MsoNormal align=center style='text-align:center'>
<hr size=2 width="100%" noshade style='color:#973DE0' align=center>
</div>
<p class=MsoNormal style='margin-bottom:12.0pt'><br>
<br>
<br>
Erik <br>
<br>
Try carrying out a model for one room at a time. The results tend to be quite
different. <br>
<br>
Cheers <br>
Paul <br>
<br>
<br>
<br>
Sent from my iPhone <br>
<br>
On 28 Sep 2009, at 15:55, Erik Eriksson <<a
href="mailto:erik.eriksson@white.se">erik.eriksson@white.se</a>> wrote:<br>
<br>
<span style='font-size:10.0pt;font-family:"Arial","sans-serif"'><br>
Hi all,</span> <br>
<span style='font-size:10.0pt;font-family:"Arial","sans-serif"'><br>
I'm doing some daylighting studies with RadianceIES with a model I've imported
from revit. The model seems to have been imported just fine.</span> <span
style='font-size:10.0pt;font-family:"Arial","sans-serif"'><br>
However I'm getting very low DF-values.</span> <span style='font-size:10.0pt;
font-family:"Arial","sans-serif"'><br>
The rooms I've been studying are rectangular cellular offices with about 12% of
the floor area consisting of windows.</span> <span style='font-size:10.0pt;
font-family:"Arial","sans-serif"'><br>
The results show that approx 5-10% the area of a working plane at 0,8 m above
the floor has a DF-value of 1.2 %.</span> <span style='font-size:10.0pt;
font-family:"Arial","sans-serif"'><br>
This feels like a very low number. The window transparancy is 0,9 and all the
walls are white colored. The ceiling is white and the floor is gray.</span> <span
style='font-size:10.0pt;font-family:"Arial","sans-serif"'><br>
<br>
Does anyone have a suggestion as to what might be wrong or if these values seem
ok.</span> <br>
<span style='font-size:10.0pt;font-family:"Arial","sans-serif"'><br>
Thanks in advance</span> <br>
<span style='font-size:10.0pt;font-family:"Arial","sans-serif"'><br>
Best regards</span> <br>
<span style='font-size:10.0pt;font-family:"Arial","sans-serif"'><br>
E r i k E r i k s s o n <br>
<br>
Energy specialist and project manager<br>
________________________________<br>
White project & environmental management<br>
<br>
Box 4700<br>
116 92 STOCKHOLM<br>
Phone: +46(0)8-402 26 77<br>
Fax: +46 (0)8-402 25 10<br>
Visit: Östgötagatan 100</span><u><span style='color:blue'><br>
</span></u><a href="http://www.white.se/"><span style='font-size:10.0pt;
font-family:"Arial","sans-serif"'>http://www.white.se</span></a><span
style='font-size:10.0pt;font-family:"Arial","sans-serif"'><br>
<br>
We are certified according to ISO 9000 and 14 001</span> <br>
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