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<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial",sans-serif">Hello,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial",sans-serif"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial",sans-serif">Does anyone know if the errors described in TMY3 files in this post from Joe Huang on Jan 14 2015 still exist in files on the
<a href="http://climate.onebuilding.org/">http://climate.onebuilding.org/</a> website? And were these errors also fixed in TMYx files?<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial",sans-serif"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial",sans-serif">Specifically I’m interested in this issue:<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial",sans-serif"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:12.0pt;font-family:"Arial",sans-serif;color:black;background:white">1) Illuminance. The TMY3s contain values for Global Horizontal, Direct Normal, Diffuse</span><span style="font-size:12.0pt;font-family:"Arial",sans-serif;color:black"><br>
<span style="background:white">Horizontal, and Zenith Illuminance that are calculated based on the sun position and solar</span><br>
<span style="background:white">radiation. <span style="background:yellow;mso-highlight:yellow">
Although the documentation states that the units are 100 lux for the first</span></span><span style="background:yellow;mso-highlight:yellow"><br>
three illuminances, and 10 candela/m2 for the Zenith Illuminance, all the TMY3 files used<br>
these units only for the period Jan. 2-31, and for the rest of the year used units of lux<br>
and candela/m2, respectively.</span><span style="background:white"> NREL put out a notice in August 2008 (see the link listed</span><br>
<span style="background:white">earlier) informing users of this discrepancy and promising a corrected version that didn't</span><br>
<span style="background:white">make it out until now! In this revision, we've decided to keep the units in the original</span><br>
<span style="background:white">TMY3 documentation, i.e., 100 lux or 10 candela/m2, which is the same as what was in the</span><br>
<span style="background:white">TMY2, and avoids the superfluous five-digit precision.</span></span><span style="font-size:10.0pt;font-family:"Arial",sans-serif"><o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial",sans-serif"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial",sans-serif"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial",sans-serif">If I use a TMY3 or TMYx file from the climate.onebuilding.org website, am I getting a TMY3 or TMYx version in which these issues are corrected?<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial",sans-serif"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial",sans-serif">Thank you,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial",sans-serif"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial",sans-serif">--<br>
<b>Anna Brannon</b>, PE, LEED AP BD+C, ASHRAE BEMP<br>
Senior Environmental Designer<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial",sans-serif"><o:p> </o:p></span></p>
<p class="MsoNormal"><b><span style="font-size:10.0pt;font-family:"Arial",sans-serif">Atelier Ten</span></b><span style="font-size:10.0pt;font-family:"Arial",sans-serif"><br>
Environmental Design Consultants + Lighting Designers<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial",sans-serif"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial",sans-serif">443 Tehama Street, 1st Floor<br>
San Francisco CA 94103<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial",sans-serif">M +1 (720) 662-6389<br>
<a href="mailto:anna.brannon@atelierten.com"><span style="color:#0563C1">anna.brannon@atelierten.com</span></a>
<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial",sans-serif"><o:p> </o:p></span></p>
<p class="MsoNormal"><u><span style="font-size:10.0pt;font-family:"Arial",sans-serif;color:#0563C1"><a href="http://www.atelierten.com/"><span style="color:#0563C1">www.atelierten.com</span></a></span></u><u><span style="color:#0563C1"><o:p></o:p></span></u></p>
<p class="MsoNormal"><u><span style="font-size:10.0pt;font-family:"Arial",sans-serif;color:#0563C1"><o:p><span style="text-decoration:none"> </span></o:p></span></u></p>
<p class="MsoNormal"><b><i><span lang="EN-US" style="font-size:10.0pt;font-family:"Arial",sans-serif;color:#70AD47">Please note that Atelier Ten is closed for the holidays December 24th through January 1<sup>st</sup>. We will also be drawing down operations
starting December 21st to allow our staff additional time to relax during the holidays. We will reopen on Monday January 4th</span></i></b><o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
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