<html><head><meta http-equiv="Content-Type" content="text/html charset=utf-8"></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;" class="">Hi Chris —<div class=""><br class=""></div><div class="">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" class="">LiCor is our go-to</a>, or an <a href="http://www.eppleylab.com/instrument-list/standard-precision-pyranometer/" class="">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 class=""><br class=""></div><div class="">Best,</div><div class="">Nathan</div><div class=""><br class=""><div class="">
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<span style="color:rgb(199,96,30)" class="">Nathan Brown, BEMP, LEED AP</span> ~ Associate
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<br class=""><div><blockquote type="cite" class=""><div class="">On Nov 10, 2017, at 3:08 AM, Chris Yates via Bldg-sim <<a href="mailto:bldg-sim@lists.onebuilding.org" class="">bldg-sim@lists.onebuilding.org</a>> wrote:</div><br class="Apple-interchange-newline"><div class=""><div dir="ltr" class=""><div class="">Dear all</div><div class=""><br class=""></div><div class="">We are trying to get a reasonable estimate for SHGC in the field.</div><div class=""><br class=""></div><div class="">Our project is a retrofit of a relatively recent build that has overheating problems. No records exist of the original glazing spec.</div><div class=""><br class=""></div><div class="">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 class=""><br class=""></div><div class="">Does anybody have any experience or know of any research relating to this?</div><div class=""><br class=""></div><div class=""><em class="">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/" class="">https://www.uv-light.co.uk/meters/irradiance-and-exposure/</a></em></div><div class=""><br class=""></div><div class="">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 class=""><br class=""></div><div class="">Cheers</div><div class=""><br class=""></div><div class="">Chris</div></div>
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