<div dir="ltr"><div>Hi Nathan</div><div><br></div><div>Does the li-cor measure short enough wavelengths? I thought a lot of the uv was < 400nm. I guess that most "selective coatings" have quite a big crossover to the visible range in their reflectivity - hence the slight green or blue hues. So, I can imagine that missing some of the uv-b isn't too big a deal.</div><div><br></div><div>Both responses are super interesting. Thank you very much!</div><div><br></div><div>Chris</div></div><div class="gmail_extra"><br><div class="gmail_quote">On Fri, Nov 10, 2017 at 6:54 PM, D. Charlie Curcija <span dir="ltr"><<a href="mailto:dccurcija@lbl.gov" target="_blank">dccurcija@lbl.gov</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div dir="ltr">At LBNL, in collaboration with University Federal Santa Catarina (UFSC), Brazil, we have designed partable window energy meter that measures SHGC in the filed. The instrument is not yet commercialized, but two companies are exploring commercialization (D&S and EPDT). In a mean time, UFSC can manufacture unit for you. I can supply you with contact information if you are interested. Also, attached link to US DOE newsletter about the instrument: <a href="https://energy.gov/eere/articles/us-brazil-collaboration-leads-innovative-device-reduces-energy-use-buildings" target="_blank">https://energy.<wbr>gov/eere/articles/us-brazil-<wbr>collaboration-leads-<wbr>innovative-device-reduces-<wbr>energy-use-buildings</a>. <div><br></div><div>Charlie</div></div><div class="gmail_extra"><div><div class="h5"><br><div class="gmail_quote">On Fri, Nov 10, 2017 at 10:07 AM, Nathan Brown via Bldg-sim <span dir="ltr"><<a href="mailto:bldg-sim@lists.onebuilding.org" target="_blank">bldg-sim@lists.onebuilding.<wbr>org</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;padding-left:1ex;border-left-color:rgb(204,204,204);border-left-width:1px;border-left-style:solid"><div style="-ms-word-wrap: break-word;">Hi Chris —<div><br></div><div>That instrument won’t do it, because it is not sensitive to infrared. More than half of irradiance is in the near IR (aka solar infrared). You need a pyranometer (<a href="https://www.licor.com/env/products/light/pyranometer.html" target="_blank">LiCor is our go-to</a>, or an <a href="http://www.eppleylab.com/instrument-list/standard-precision-pyranometer/" target="_blank">Eppley</a> for critical measurements, although that is probably overkill for this). I would measure vertical irradiance just inside and just outside the glass under direct sunlight. Here in the Bay Area, there is a tool lending library that will loan a pyranometer. Perhaps you can find a similar source closer to you.</div><div><br></div><div>Best,</div><div>Nathan</div><div><br><div>
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<br><div><blockquote type="cite"><div><div class="m_-6656889194143773355h5"><div>On Nov 10, 2017, at 3:08 AM, Chris Yates via Bldg-sim <<a href="mailto:bldg-sim@lists.onebuilding.org" target="_blank">bldg-sim@lists.onebuilding.or<wbr>g</a>> wrote:</div><br class="m_-6656889194143773355m_703449543502198594Apple-interchange-newline"></div></div><div><div><div class="m_-6656889194143773355h5"><div dir="ltr"><div>Dear all</div><div><br></div><div>We are trying to get a reasonable estimate for SHGC in the field.</div><div><br></div><div>Our project is a retrofit of a relatively recent build that has overheating problems. No records exist of the original glazing spec.</div><div><br></div><div>The glazing has a slight green tint; i.e. the "look and feel" of a fairly modern spectrally selective product with g-value (sorry SHGC) of about 0.4. However, a team member has now produced some records indicating this is significantly higher (more like 0.6).</div><div><br></div><div>Does anybody have any experience or know of any research relating to this?</div><div><br></div><div><em>I was thinking of something like this, taking measurements on the horizontal and vertical plane inside and out: <a href="https://www.uv-light.co.uk/meters/irradiance-and-exposure/" target="_blank">https://www.uv-light.co.uk/met<wbr>ers/irradiance-and-exposure/</a></em></div><div><br></div><div>Our saint gobain rep tells me their spectrographic equipment is 50,000 GBP - a bit out of our price range! (They've offered to test a sample for us!).</div><div><br></div><div>Cheers</div><div><br></div><div>Chris</div></div></div></div>
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<br></blockquote></div><br><br clear="all"><div><br></div></div></div>-- <br><div class="m_-6656889194143773355gmail_signature" data-smartmail="gmail_signature"><div dir="ltr"><span style="border-collapse:collapse"><p style="margin:0px;font-family:Helvetica"></p><p style="margin:0px"></p><p style="margin:0in 0in 0pt"><span style="font-family:"Courier New""><font size="1"><b>------------------------------<wbr>------------------------------<wbr>--------------</b></font></span></p>
<p style="margin:0in 0in 0pt"><font size="1"><b><span style="font-family:"Courier New"">D. Charlie Curcija</span></b></font><b style="font-family:arial;font-size:x-small"><span style="font-family:"Courier New"">, Ph.D. </span></b><b style="font-size:x-small"><span style="font-family:"Courier New""> Tel: <a href="tel:(510)%20495-2602" target="_blank" value="+15104952602">(510) 495-2602</a></span></b></p>
<p style="margin:0in 0in 0pt"><font size="1"><b><span style="font-family:"Courier New"">Lawrence Berkeley National Laboratory Fax: <a href="tel:(510)%20486-4089" target="_blank" value="+15104864089">(510) 486-4089</a></span><span style="font-family:Arial,sans-serif"></span></b></font></p>
<p style="margin:0in 0in 0pt"><font size="1"><b><span style="font-family:"Courier New"">Windows & Envelope Materials Group Cell:<a href="tel:(510)%20604-8668" target="_blank" value="+15106048668">(510) 604-8668</a></span><span style="font-family:Arial,sans-serif"></span></b></font></p>
<p style="margin:0in 0in 0pt"><font size="1"><b><span style="font-family:"Courier New"">1 Cyclotron Rd., MS 90-3111 Email:<span> </span><a href="mailto:dccurcija@lbl.gov" target="_blank">dccurcija@lbl.gov</a></span><span style="font-family:Arial,sans-serif"></span></b></font></p>
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