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<div class=Section1>
<p class=MsoNormal><span style='font-family:"Calibri","sans-serif";color:#1F497D'>Thanks
for sharing Alex =).<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-family:"Calibri","sans-serif";color:#1F497D'>Regarding
that concern I voiced between visible and other wavelengths… I dug a
little and found a resource supporting the notion. See the color chart near
the bottom of the following link that plots water absorption coefficients
against the electromagnetic wavelength spectrum – visible light is
absorbed by water much less than other wavelength ranges. <a
href="http://www.lsbu.ac.uk/water/vibrat.html">http://www.lsbu.ac.uk/water/vibrat.html</a><o:p></o:p></span></p>
<p class=MsoNormal><span style='font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-family:"Calibri","sans-serif";color:#1F497D'>Again,
I brought this up for two purposes: To suggest a reason why the DOE2 help
files list an albedo of 0.05 for the ocean (unqualified with a frequency range
like “visible light,” ‘albedo’ generally refers to the
full electromagnetic spectrum), and as a reason to caution that a majority of
the sun’s energy which might otherwise produce a solar heat gain on a
building envelope may fall outside the visible range, and thus would be
subtracted out of what’s reflected to your building if you’re
talking about a body of water. Again, I’m no physicist but I know enough
to suggest caution.<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-family:"Calibri","sans-serif";color:#1F497D'>If
you’re modeling daylighting controls, the lake could certainly be modeled
as a surface with a reflectance in the 90%+ range at low incident angles
(sunrise/sunset), but if you’re trying to account for additional envelope
thermal loads reflected from a lake, I think your albedo figure should never fall
in that range (unless, again, the lake is covered with snow), and that figure further
might not vary appreciably with the incident angle… <o:p></o:p></span></p>
<p class=MsoNormal><span style='font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-family:"Calibri","sans-serif";color:#1F497D'>***<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-family:"Calibri","sans-serif";color:#1F497D'>Calculating
seasonal sun angles for a specific latitude/longitude as a separate topic can
be a tricky business – but there a number of free and for-cost tools that
do all the legwork for you. <o:p></o:p></span></p>
<p class=MsoNormal><span style='font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-family:"Calibri","sans-serif";color:#1F497D'>Here’s
one example of a free, simplistic tool to get angles at a specific
time/location: <a
href="http://solardat.uoregon.edu/SolarPositionCalculator.html">http://solardat.uoregon.edu/SolarPositionCalculator.html</a><o:p></o:p></span></p>
<p class=MsoNormal><span style='font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-family:"Calibri","sans-serif";color:#1F497D'>A
tangent tip: you can right-click anywhere in google maps and select “what’s
here” from the context menu to get the exact latitude and longitude for
your location.<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-family:"Calibri","sans-serif";color:#1F497D'>~Nick<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p>
<div>
<p class=MsoNormal><span style='font-family:"Calibri","sans-serif";color:#1F497D'><img
border=0 width=119 height=37 id="_x0000_i1033"
src="cid:image001.jpg@01CB96B4.B9DBF1B0" alt="cid:489575314@22072009-0ABB"></span><b><span
style='font-family:"Stylus BT","sans-serif";color:#2D4D5E'><o:p></o:p></span></b></p>
<p class=MsoNormal><b><span style='font-family:"Stylus BT","sans-serif";
color:#2D4D5E'><o:p> </o:p></span></b></p>
<p class=MsoNormal><b><span style='font-family:"Stylus BT","sans-serif";
color:#2D4D5E'>NICK CATON, E.I.T.</span></b><b><span style='font-size:12.0pt;
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<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Calibri","sans-serif";
color:#2D4D5E'>Smith & Boucher Engineers</span><span style='font-size:7.5pt;
font-family:"Times New Roman","serif";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><span style='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-family:"Calibri","sans-serif";color:#1F497D'><o:p></o:p></span></p>
</div>
<p class=MsoNormal><span style='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 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"'> Alex Krickx
[mailto:akrickx@seriousmaterials.com] <br>
<b>Sent:</b> Tuesday, December 07, 2010 9:08 PM<br>
<b>To:</b> Nick Caton<br>
<b>Subject:</b> RE: [Equest-users] Ground/Water reflectance<o:p></o:p></span></p>
</div>
</div>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal><span style='font-family:"Calibri","sans-serif";color:#1F497D'>Hi
Nick,<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-family:"Calibri","sans-serif";color:#1F497D'>Thanks
for the in depth response (as always!).<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-family:"Calibri","sans-serif";color:#1F497D'>I’m
working off of this website: <a
href="http://www.atmosphere.mpg.de/enid/3rv.html">http://www.atmosphere.mpg.de/enid/3rv.html</a>
<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-family:"Calibri","sans-serif";color:#1F497D'>Which
shows how reflectance of water changes with the sun’s angle.<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-family:"Calibri","sans-serif";color:#1F497D'>The
late afternoon sun (in winter) could have reflectance of as much as 35%... It
looks like late afternoon in summer just doesn’t have that high of sun
angles which I found surprising.<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-family:"Calibri","sans-serif";color:#1F497D'>I’m
still trying to get my head around the whole thing, but figured I’d share
the link with you.<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-family:"Calibri","sans-serif";color:#1F497D'>In
my readings I didn’t see where it said that water would absorb infrared
while reflecting visible wavelengths. Working with glass and Low-E coatings, I
have some idea of how different wavelengths interact differently with different
materials (but I’m also not an astrophysicist). In any case, it’s
been interesting reading people’s viewpoints on this one. <o:p></o:p></span></p>
<p class=MsoNormal><span style='font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-family:"Calibri","sans-serif";color:#1F497D'>Cheers,<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-family:"Calibri","sans-serif";color:#1F497D'>Alex
<o:p></o:p></span></p>
<p class=MsoNormal><span style='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 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"'> Nick Caton
[mailto:ncaton@smithboucher.com] <br>
<b>Sent:</b> Tuesday, December 07, 2010 12:23 PM<br>
<b>To:</b> Alex Krickx; Bishop, Bill; equest-users@lists.onebuilding.org<br>
<b>Subject:</b> RE: [Equest-users] Ground/Water reflectance<o:p></o:p></span></p>
</div>
</div>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal><span style='font-family:"Calibri","sans-serif";color:#1F497D'>Hey
Alex,<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-family:"Calibri","sans-serif";color:#1F497D'>I
hate to muddy the waters further, but I’m pretty sure the visible light
spectrum (a small band of the sun’s energy) does not behave identically
to the rest of the electromagnetic spectrum regarding how much energy is
reflected for a given incidence angle on water… <o:p></o:p></span></p>
<p class=MsoNormal><span style='font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-family:"Calibri","sans-serif";color:#1F497D'>To
voice my concern another way: sunlight bounced from a lake in the
morning/evening may well effectively double the amount of visible light energy
incident on a building façade for a certain hour, but this would likely not
result in a corresponding doubled thermal solar load – energy at
frequencies above/below the visible light spectrum may be more prone to simply
dive into the lake…<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-family:"Calibri","sans-serif";color:#1F497D'>I
understand the term ‘albedo’ in the context of collected weather
data / energy modeling generally refers to the full spectrum of the sun’s
energy (light inclusive), and you might trip yourself up by assuming
terrestrial surface albedo is the same thing as surface reflectivity, for
light. <o:p></o:p></span></p>
<p class=MsoNormal><span style='font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-family:"Calibri","sans-serif";color:#1F497D'>(good
catch-up reading with examples: <a
href="http://en.wikipedia.org/wiki/Albedo">http://en.wikipedia.org/wiki/Albedo</a>)<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-family:"Calibri","sans-serif";color:#1F497D'>Water
bodies do have a really low albedo – not because they do not reflect
light, but mostly because they suck up the rest of the electromagnetic spectrum
really well. If on the other hand your lake freezes and is covered with
snow during the winter, I’d expect the sun’s full spectrum of
energy to bounce much more effectively to your cozy lakehouse =). <o:p></o:p></span></p>
<p class=MsoNormal><span style='font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-family:"Calibri","sans-serif";color:#1F497D'>PS:
I am no astro-physicist, nor am I a meteorologist… I’m only
throwing out some cautions/thoughts from what I’ve picked up here and
there on the topic…<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-family:"Calibri","sans-serif";color:#1F497D'>~Nick<o:p></o:p></span></p>
<div>
<p class=MsoNormal><span style='font-family:"Calibri","sans-serif";color:#1F497D'><img
border=0 width=119 height=37 id="Picture_x0020_1"
src="cid:image001.jpg@01CB96B4.B9DBF1B0" alt="cid:489575314@22072009-0ABB"></span><b><span
style='font-family:"Stylus BT","sans-serif";color:#2D4D5E'><o:p></o:p></span></b></p>
<p class=MsoNormal><b><span style='font-family:"Stylus BT","sans-serif";
color:#2D4D5E'><o:p> </o:p></span></b></p>
<p class=MsoNormal><b><span style='font-family:"Stylus BT","sans-serif";
color:#2D4D5E'>NICK CATON, E.I.T.</span></b><b><span style='font-size:12.0pt;
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<o:p></o:p></span></p>
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color:#2D4D5E'>Smith & Boucher Engineers</span><span style='font-size:7.5pt;
font-family:"Times New Roman","serif";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>
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color:#2D4D5E'>olathe ks 66061<o:p></o:p></span></p>
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color:#2D4D5E'>direct 913 344.0036<o:p></o:p></span></p>
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color:#2D4D5E'>fax 913 345.0617<o:p></o:p></span></p>
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style='font-size:10.0pt'>www.smithboucher.com</span></a></span><u><span
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<p class=MsoNormal><span style='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 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"'>
equest-users-bounces@lists.onebuilding.org
[mailto:equest-users-bounces@lists.onebuilding.org] <b>On Behalf Of </b>Alex
Krickx<br>
<b>Sent:</b> Tuesday, December 07, 2010 1:13 PM<br>
<b>To:</b> Bishop, Bill; equest-users@lists.onebuilding.org<br>
<b>Subject:</b> Re: [Equest-users] Ground/Water reflectance<o:p></o:p></span></p>
</div>
</div>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal><span style='font-family:"Calibri","sans-serif";color:#1F497D'>So
changing it to 0.05 to try to account for the reflectance of the water, would
actually <i>decrease </i>the reflected solar heat… <o:p></o:p></span></p>
<p class=MsoNormal><span style='font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-family:"Calibri","sans-serif";color:#1F497D'>Hmmm.
I’ll play with some different values in eQUEST and see how much ground
reflectance impacts consumption, and keep in mind the 0.05 value.<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-family:"Calibri","sans-serif";color:#1F497D'>Thanks
for everyone’s quick and thoughtful responses. <o:p></o:p></span></p>
<p class=MsoNormal><span style='font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-family:"Calibri","sans-serif";color:#1F497D'>Cheers,<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-family:"Calibri","sans-serif";color:#1F497D'>Alex<o:p></o:p></span></p>
<p class=MsoNormal><span style='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 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"'> Bishop, Bill
[mailto:wbishop@pathfinder-ea.com] <br>
<b>Sent:</b> Tuesday, December 07, 2010 11:08 AM<br>
<b>To:</b> Alex Krickx; equest-users@lists.onebuilding.org<br>
<b>Subject:</b> RE: [Equest-users] Ground/Water reflectance<o:p></o:p></span></p>
</div>
</div>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal><span style='font-size:10.0pt;color:navy'>Alex,<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;color:navy'>The default ground
reflectance is 0.20. You have to enter a different value for it to appear in
the inp file.<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;color:navy'>Bill<o:p></o:p></span></p>
<div>
<div class=MsoNormal align=center style='text-align:center'><span
style='font-size:12.0pt;font-family:"Times New Roman","serif"'>
<hr size=2 width="100%" align=center>
</span></div>
<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"'> Fleming, Joe
[mailto:joe.fleming@tlc-eng.com] <br>
<b>Sent:</b> Tuesday, December 07, 2010 2:03 PM<br>
<b>To:</b> Alex Krickx; Bishop, Bill; John Aulbach; equest-users@lists.onebuilding.org<br>
<b>Subject:</b> RE: [Equest-users] Ground/Water reflectance</span><span
style='font-size:12.0pt;font-family:"Times New Roman","serif"'><o:p></o:p></span></p>
</div>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal><span style='font-family:"Calibri","sans-serif";color:#1F497D'>The
albedo of an ocean should probably equal that of a lake on an average basis
throughout the day (not a peak hourly basis). The radiation reflected by
water is very low when the incident wave is perpendicular to the surface of the
water, and it approaches 100% as the angle of incidence approaches 90 degrees
(morning and evening). As the waves move through the water the incident
angle of each zone of water will vary from 0-90 degrees on a constant basis and
the reflectance should roughly average out to equal that of a still body of
water. <o:p></o:p></span></p>
<p class=MsoNormal><span style='font-family:"Calibri","sans-serif";color:#1F497D'>For
a lake, in the late afternoon, the reflectance will increase from 0.05 to 0.1
or 0.2. Later in the evening it will reach closer to 0.8 or 0.9,
but at this time the radiation intensity from the sun drops off significantly.<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-family:"Calibri","sans-serif";color:#1F497D'>To
model the lake on one side is a challenge, your peak loads may not change but
your annual consumption may. If eQuest uses the gnd reflectance
values as a multiplier of solar radiation, it may be worth running a few
iterations with different values of gnd reflectance to see the results.<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p>
<div>
<p class=MsoNormal><b><span style='font-family:"Calibri","sans-serif";
color:#1F497D'>Joe Fleming<o:p></o:p></span></b></p>
<p class=MsoNormal><i><span style='font-size:10.0pt;font-family:"Calibri","sans-serif";
color:#333333'>E.I., LEED AP BD+C, BEMP<o:p></o:p></span></i></p>
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color:#333333'>Mechanical Engineer I<o:p></o:p></span></i></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
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<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Calibri","sans-serif";
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<p class=MsoNormal><a href="http://www.tlc-engineers.com/"><span
style='font-family:"Calibri","sans-serif";text-decoration:none'><img border=0
width=700 height=49 id="_x0000_i1027" src="cid:image002.gif@01CB96B4.B9DBF1B0"
alt="http://www.tlc-engineers.com/images/TLC_Sig_Loc_Block.gif"></span></a><span
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<div>
<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"'>
equest-users-bounces@lists.onebuilding.org [mailto:equest-users-bounces@lists.onebuilding.org]
<b>On Behalf Of </b>Alex Krickx<br>
<b>Sent:</b> Tuesday, December 07, 2010 1:28 PM<br>
<b>To:</b> Bishop, Bill; John Aulbach; equest-users@lists.onebuilding.org<br>
<b>Subject:</b> Re: [Equest-users] Ground/Water reflectance<o:p></o:p></span></p>
</div>
</div>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal><span style='font-family:"Calibri","sans-serif";color:#1F497D'>Thanks
Bill and John for your responses. <o:p></o:p></span></p>
<p class=MsoNormal><span style='font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-family:"Calibri","sans-serif";color:#1F497D'>I
guess I would expect that the ocean would be a bit more “turbid”
(seems appropriate) – but what about for buildings facing a lake or
harbor where the water is calmer? Perhaps the additional reflected solar gain
is negligible, but my gut tells me that is not the case. <o:p></o:p></span></p>
<p class=MsoNormal><span style='font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-family:"Calibri","sans-serif";color:#1F497D'>This
project is a retrofit and they talked of having intense heat along the facades
facing the water. Perhaps it’s more due to the tinted single-pane glass
that gets hot (?) but my initial thought was the water is the culprit.<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-family:"Calibri","sans-serif";color:#1F497D'>Is
it possible to create a 2d shape in the ground plane south of the building, and
apply the reflectance to that, or do I need to apply it to the whole ground?<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-family:"Calibri","sans-serif";color:#1F497D'>I
looked through a previous project and didn’t see the term
“GND-REFLECTANCE” anywhere in the inp or pd2 files. Is the default
to have a ground-reflectance of 0? If so, I guess I’ll run one case with
0, and one with 0.05… although I doubt there will be much difference
between the two.<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-family:"Calibri","sans-serif";color:#1F497D'><br>
Thanks again – any other thoughts on this are much appreciated.<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-family:"Calibri","sans-serif";color:#1F497D'>Kind
regards,<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-family:"Calibri","sans-serif";color:#1F497D'>Alex
Krickx<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:12.0pt;font-family:"Calibri","sans-serif";
color:#262F13'>Alex Krickx<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:9.0pt;font-family:"Calibri","sans-serif";
color:gray'>Building Energy Specialist<o:p></o:p></span></p>
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color:#1F497D'>1250 Elko Dr, Sunnyvale, CA 94089<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:9.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>(t) 408.541.8124<o:p></o:p></span></p>
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<p class=MsoNormal><span style='font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p>
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<div>
<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"'> Bishop, Bill
[mailto:wbishop@pathfinder-ea.com] <br>
<b>Sent:</b> Tuesday, December 07, 2010 7:20 AM<br>
<b>To:</b> John Aulbach; Alex Krickx; equest-users@lists.onebuilding.org<br>
<b>Subject:</b> RE: [Equest-users] Ground/Water reflectance<o:p></o:p></span></p>
</div>
</div>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal><span style='font-size:10.0pt;color:navy'>Alex,<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;color:navy'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;color:navy'>Exterior surfaces
have a “Ground reflectance” property – GND-REFLECTANCE,
accessible through the Daylighting – Shading – Other tab of the
exterior surface. Reading the DOE-2 Help description, the reflectance value for
“ocean” is 0.05, implying that most solar radiation is absorbed,
not reflected. I’m guessing that the visual glare we perceive does not
increase the solar load as much as we would think. Sea monsters do not seem to
have been considered by the DOE-2 team.<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;color:navy'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;color:navy'>Regards,<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;color:navy'>Bill<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;color:navy'><o:p> </o:p></span></p>
<div>
<p class=MsoNormal><b><span style='font-size:10.0pt;font-family:"Franklin Gothic Medium Cond";
color:black'>William Bishop, PE, BEMP, LEED<sup>®</sup> AP </span></b><b><span
style='font-size:10.0pt;font-family:"Franklin Gothic Medium Cond";color:#006600'>|</span></b><b><span
style='font-size:10.0pt;font-family:"Franklin Gothic Medium Cond";color:black'>
Pathfinder Engineers & Architects LLP<o:p></o:p></span></b></p>
<p class=MsoNormal><span style='font-size:9.0pt;color:black'>Mechanical
Engineer<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:5.0pt;color:black'><o:p> </o:p></span></p>
<p class=MsoNormal><!--[if gte vml 1]><v:shapetype id="_x0000_t75" coordsize="21600,21600"
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<span style='font-size:9.0pt;color:navy'>T: (585) 325-6004 </span><span
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<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"'>
equest-users-bounces@lists.onebuilding.org
[mailto:equest-users-bounces@lists.onebuilding.org] <b>On Behalf Of </b>John
Aulbach<br>
<b>Sent:</b> Monday, December 06, 2010 8:35 PM<br>
<b>To:</b> Alex Krickx; equest-users@lists.onebuilding.org<br>
<b>Subject:</b> Re: [Equest-users] Ground/Water reflectance</span><span
style='font-size:12.0pt;font-family:"Times New Roman","serif"'><o:p></o:p></span></p>
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<p class=MsoNormal><o:p> </o:p></p>
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<p>Alex:<o:p></o:p></p>
<p> <o:p></o:p></p>
<p>I wonder if the turbidity (word ??) of the water will actually not make a
difference. Any harbor will have boats, wind effects, and an occasional sea
monster disturbing the "glass" water.<o:p></o:p></p>
<p> <o:p></o:p></p>
<p>Only in paintings ???<o:p></o:p></p>
<p> <o:p></o:p></p>
<p class=MsoNormal><span style='font-family:"Calibri","sans-serif";color:#1F497D'>John
R. Aulbach, PE, CEM<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>Senior Energy Engineer<o:p></o:p></span></p>
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<p class=MsoNormal><b><span style='font-family:"Calibri","sans-serif";
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<p class=MsoNormal><span style='font-family:"Calibri","sans-serif";color:#1F497D'>1990
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<span style='font-family:"Calibri","sans-serif";color:#1F497D'>W: 888-826-1216,
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<p class=MsoNormal style='margin-bottom:12.0pt'><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"'> Alex Krickx
<akrickx@seriousmaterials.com><br>
<b>To:</b> "equest-users@lists.onebuilding.org"
<equest-users@lists.onebuilding.org><br>
<b>Sent:</b> Mon, December 6, 2010 5:11:24 PM<br>
<b>Subject:</b> [Equest-users] Ground/Water reflectance</span><span
style='font-size:12.0pt;font-family:"Times New Roman","serif"'><o:p></o:p></span></p>
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<p class=MsoNormal>Hello everyone,<o:p></o:p></p>
<p class=MsoNormal> <o:p></o:p></p>
<p class=MsoNormal>I’ve got a building that is located at the edge of a
harbor with the water directly to the south of it. How do I model a reflective
surface on the ground that represents the harbor? I feel this is key to
include, as this reflectivity will send additional heat through the windows. I
looked through the archives but didn’t see anything related to ground
reflectivity.<o:p></o:p></p>
<p class=MsoNormal> <o:p></o:p></p>
<p class=MsoNormal>If anyone knows how to create reflective objects and/or an
appropriate value of reflectivity for water in eQUEST, that would be most
helpful.<o:p></o:p></p>
<p class=MsoNormal> <o:p></o:p></p>
<p class=MsoNormal>Thanks in advance!<o:p></o:p></p>
<p class=MsoNormal> <o:p></o:p></p>
<p class=MsoNormal>Regards,<o:p></o:p></p>
<p class=MsoNormal>Alex Krickx<o:p></o:p></p>
<p class=MsoNormal> <o:p></o:p></p>
<p class=MsoNormal> <o:p></o:p></p>
<p class=MsoNormal><span style='font-size:12.0pt;color:#262F13'>Alex Krickx</span><o:p></o:p></p>
<p class=MsoNormal><span style='font-size:9.0pt;color:gray'>Building Energy
Specialist</span><o:p></o:p></p>
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<p class=MsoNormal><span style='font-size:9.0pt'>1250 Elko Dr, Sunnyvale, CA
94089</span><o:p></o:p></p>
<p class=MsoNormal><span style='font-size:9.0pt'>(t) 408.541.8124</span><o:p></o:p></p>
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