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<div class=Section1>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>Erik/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'>I’d agree on the glazing spec thing don’t go putting
in very clear glass unless you are very sure that it’s going to have
those sorts of properties. A check of the G value should help give you a guide
to light transmittance. Or just check out the Pilkington website or similar to
give you a good idea, their selection tool (think it’s called spectrum or
something, a while since I’ve used it) is quite good for getting some
ideas of what it will be like.<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'>In terms of the daylight studies, they should always be carried
out using the IEE overcast sky to assess daylight factors. If you want to
check out glare etc obviously use a different sky, but for DF calculations the
overcast sky should be used. The default positions of everything else in IES
should be ok once you’ve set that up as it will work out the working
plane levels based on that sky. <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'>Nick, you should be able to download IES for a trial from their
website normally. Just email in a request for keys and they should set you up
with a trial. If you haven’t checked out DesignBuilder you might want to
do that too (30 day trial available from their website). Quite similar tool
(front end slightly more sketchup like than IES), but uses energyplus instead.
Doesn’t have the radiance link yet, but we keep pestering the guys there
to get that link in.<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'>Regards<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>Paul<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'><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>
<div>
<div style='border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0cm 0cm 0cm'>
<p class=MsoNormal><b><span lang=EN-US style='font-size:10.0pt;font-family:
"Tahoma","sans-serif"'>From:</span></b><span lang=EN-US style='font-size:10.0pt;
font-family:"Tahoma","sans-serif"'> Nick Caton [mailto:ncaton@smithboucher.com]
<br>
<b>Sent:</b> 28 September 2009 16:29<br>
<b>To:</b> Erik Eriksson; 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>
</div>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal><span lang=EN-US style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>Hi Erik,<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span lang=EN-US 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 lang=EN-US style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoListParagraph style='text-indent:-18.0pt;mso-list:l0 level1 lfo2'><![if !supportLists]><span
lang=EN-US 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 lang=EN-US 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:-18.0pt;mso-list:l0 level1 lfo2'><![if !supportLists]><span
lang=EN-US 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 lang=EN-US 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:-18.0pt;mso-list:l0 level1 lfo2'><![if !supportLists]><span
lang=EN-US 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 lang=EN-US 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:-18.0pt;mso-list:l0 level1 lfo2'><![if !supportLists]><span
lang=EN-US 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 lang=EN-US 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:-18.0pt;mso-list:l0 level1 lfo2'><![if !supportLists]><span
lang=EN-US 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 lang=EN-US 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 lang=EN-US style='font-size:11.0pt;font-family:
"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span lang=EN-US style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>~Nick<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span lang=EN-US style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span lang=EN-US 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@01CA40E9.98852260" alt="cid:489575314@22072009-0ABB"></span><b><span
lang=EN-US 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 lang=EN-US 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 lang=EN-US style='font-size:11.0pt;font-family:
"Stylus BT","sans-serif";color:#2D4D5E'>NICK CATON, E.I.T.</span></b><b><span
lang=EN-US style='font-family:"Stylus BT","sans-serif";color:#2D4D5E'><o:p></o:p></span></b></p>
<p class=MsoNormal><span lang=EN-US style='font-size:7.5pt;font-family:"Calibri","sans-serif";
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title="blocked::www.smithboucher.com"><span style='font-size:10.0pt'>www.smithboucher.com</span></a></span><u><span
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"Calibri","sans-serif";color:#1F497D'><o:p></o:p></span></p>
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<div style='border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0cm 0cm 0cm'>
<p class=MsoNormal><b><span lang=EN-US style='font-size:10.0pt;font-family:
"Tahoma","sans-serif"'>From:</span></b><span lang=EN-US 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><span lang=EN-US><o:p> </o:p></span></p>
<p class=MsoNormal style='margin-bottom:12.0pt'><span lang=EN-US><br>
</span><span lang=EN-US style='font-size:10.0pt;font-family:"Arial","sans-serif"'>Hey,</span><span
lang=EN-US> <br>
<br>
</span><span lang=EN-US 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><span lang=EN-US><br>
</span><span lang=EN-US style='font-size:10.0pt;font-family:"Arial","sans-serif"'>So
I cant really say if the values are correct or not.</span><span lang=EN-US> <br>
<br>
</span><span lang=EN-US style='font-size:10.0pt;font-family:"Arial","sans-serif"'>Best
regards</span><span lang=EN-US> <br>
<br>
</span><span lang=EN-US 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><span lang=EN-US><a href="http://www.white.se/"><span style='font-size:
10.0pt;font-family:"Arial","sans-serif"'>http://www.white.se</span></a></span><span
lang=EN-US style='font-size:10.0pt;font-family:"Arial","sans-serif"'><br>
<br>
We are certified according to ISO 9000 and 14 001</span><span lang=EN-US> <o:p></o:p></span></p>
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style='width:100.0%'>
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<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>
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<p class=MsoNormal><span style='font-size:7.5pt;font-family:"Arial","sans-serif";
color:#5F5F5F'>To:</span> <o:p></o:p></p>
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<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>
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<p class=MsoNormal><span style='font-size:7.5pt;font-family:"Arial","sans-serif";
color:#5F5F5F'>Cc:</span> <o:p></o:p></p>
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<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>
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<p class=MsoNormal><span style='font-size:7.5pt;font-family:"Arial","sans-serif";
color:#5F5F5F'>Date:</span> <o:p></o:p></p>
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<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>
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<p class=MsoNormal><span style='font-size:7.5pt;font-family:"Arial","sans-serif";
color:#5F5F5F'>Subject:</span> <o:p></o:p></p>
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<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>
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<p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p>
<div class=MsoNormal align=center style='text-align:center'><span lang=EN-US>
<hr size=2 width="100%" noshade style='color:#973DE0' align=center>
</span></div>
<p class=MsoNormal style='margin-bottom:12.0pt'><span lang=EN-US><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><span lang=EN-US style='font-size:10.0pt;font-family:"Arial","sans-serif"'><br>
Hi all,</span><span lang=EN-US> <br>
</span><span lang=EN-US 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
lang=EN-US> </span><span lang=EN-US style='font-size:10.0pt;font-family:"Arial","sans-serif"'><br>
However I'm getting very low DF-values.</span><span lang=EN-US> </span><span
lang=EN-US 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 lang=EN-US> </span><span
lang=EN-US 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 lang=EN-US> </span><span
lang=EN-US 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
lang=EN-US> </span><span lang=EN-US 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><span lang=EN-US> <br>
</span><span lang=EN-US style='font-size:10.0pt;font-family:"Arial","sans-serif"'><br>
Thanks in advance</span><span lang=EN-US> <br>
</span><span lang=EN-US style='font-size:10.0pt;font-family:"Arial","sans-serif"'><br>
Best regards</span><span lang=EN-US> <br>
</span><span lang=EN-US 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>
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Phone: +46(0)8-402 26 77<br>
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Visit: Östgötagatan 100</span><u><span lang=EN-US
style='color:blue'><br>
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style='font-size:10.0pt;font-family:"Arial","sans-serif"'>http://www.white.se</span></a></span><span
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