<html>
<body>
<font size=3>the TMY3 files on climate.onebuilding.org have been
corrected from the document posted by Joe Huang on the tmy3 site.
But I think that was for precipitation.<br><br>
the TMYx files would never have had this problem as they come from a
different source of our creation for the TMYx files.<br><br>
And, as I remember, the illuminance problem was corrected by NREL at some
point after their first post.<br><br>
------<br>
Linda<br><br>
FIBPSA, FASHRAE<br>
<a href="http://climate.onebuilding.org/" eudora="autourl">
http://climate.onebuilding.org</a> - free repository of climate data for
building simulation<br>
Climate.onebuilding is a FREE service not supported by any outside
organization or government agency. <br><br>
<br><br>
<blockquote type=cite class=cite cite="">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?<br><br>
Specifically I’m interested in this issue:<br><br>
<br>
1) Illuminance. The TMY3s contain values for Global Horizontal, Direct
Normal, Diffuse<br>
Horizontal, and Zenith Illuminance that are calculated based on the sun
position and solar<br>
radiation. Although the documentation states that the units are 100 lux
for the first<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. NREL put out a notice in August 2008 (see
the link listed<br>
earlier) informing users of this discrepancy and promising a corrected
version that didn't<br>
make it out until now! In this revision, we've decided to keep the units
in the original<br>
TMY3 documentation, i.e., 100 lux or 10 candela/m2, which is the same as
what was in the<br>
TMY2, and avoids the superfluous five-digit precision.<br><br>
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?<br>
</font></blockquote></body>
</html>