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<p>Interesting to see my work described by someone who was never
involved. The original driver for doing that work was to correct
the decimal mistake in some of the illuminance data that NREL had
noted in 2005 but never corrected because the original developers
had retired. The reporting of precipitation was an additional
improvement I offered to NREL, and actually ended up the lion's
share of the work because it required reprocessing all the source
weather files. Neither of these corrections/improvements should
affect any other weather set developed from scratch. i have
always been careful to not infringe on NREL's branding of TMY for
a number of reasons, one of which has just been shown that all
TMYs are assumed to be related.<br>
</p>
<p>Joe<br>
</p>
<pre class="moz-signature" cols="90">Joe Huang
White Box Technologies, Inc.
346 Rheem Blvd., Suite 205A
Moraga CA 94556
<a class="moz-txt-link-abbreviated" href="mailto:yjhuang@whiteboxtechnologies.com">yjhuang@whiteboxtechnologies.com</a>
<a class="moz-txt-link-freetext" href="http://weather.whiteboxtechnologies.com">http://weather.whiteboxtechnologies.com</a> for simulation-ready weather data
(o) (925)388-0265
(c) (510)928-2683
"building energy simulations at your fingertips"
</pre>
<div class="moz-cite-prefix">On 12/21/2020 3:04 PM, Linda Lawrie via
Bldg-sim wrote:<br>
</div>
<blockquote type="cite"
cite="mid:20201221230632.4FE8330C2CD@pdx1-mailman02.dreamhost.com">
<meta http-equiv="content-type" content="text/html;
charset=windows-1252">
<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"
moz-do-not-send="true">
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>
</font>
<blockquote type="cite" class="cite" cite=""><font size="3">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/"
moz-do-not-send="true">
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>
<br>
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</blockquote>
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