<div dir="ltr"><div>Like glazing, I'm often a bit lost when it comes to rooting out the right weather file. In one instance, this has even led to purchasing the same data twice from CIBSE!</div><div><br></div>I've thought that either better presentation of metadata or applying checksums to weather files could get around this.<div><br></div><div>Chris</div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Tue, Dec 22, 2020 at 1:11 AM Joe Huang via Bldg-sim <<a href="mailto:bldg-sim@lists.onebuilding.org">bldg-sim@lists.onebuilding.org</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">
<div>
<p>I forgot to mention as an aside I noticed that NREL had taken the
(revised) TMY3 files offline several months ago. However, these
TMY3s in EPW and BINM formats are still available on my Web site
at <a href="http://weather.whiteboxtechnologies.com/TMY3" target="_blank">weather.whiteboxtechnologies.com/TMY3</a>. I'm also in the
process of adding the *.CSV format to the files now that they're
gone from the NREL Web site.</p>
<p>Joe<br>
</p>
<pre cols="90">Joe Huang
White Box Technologies, Inc.
346 Rheem Blvd., Suite 205A
Moraga CA 94556
<a href="mailto:yjhuang@whiteboxtechnologies.com" target="_blank">yjhuang@whiteboxtechnologies.com</a>
<a href="http://weather.whiteboxtechnologies.com" target="_blank">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>On 12/21/2020 3:55 PM, Joe Huang wrote:<br>
</div>
<blockquote type="cite">
<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 cols="90">Joe Huang
White Box Technologies, Inc.
346 Rheem Blvd., Suite 205A
Moraga CA 94556
<a href="mailto:yjhuang@whiteboxtechnologies.com" target="_blank">yjhuang@whiteboxtechnologies.com</a>
<a href="http://weather.whiteboxtechnologies.com" target="_blank">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>On 12/21/2020 3:04 PM, Linda Lawrie
via Bldg-sim wrote:<br>
</div>
<blockquote type="cite">
<font size="3">the TMY3 files on <a href="http://climate.onebuilding.org" target="_blank">climate.onebuilding.org</a> 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/" target="_blank"> 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"><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/" target="_blank"> 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
<a href="http://climate.onebuilding.org" target="_blank">climate.onebuilding.org</a> website, am I getting a TMY3 or TMYx
version in which these issues are corrected?<br>
</font></blockquote>
<br>
<fieldset></fieldset>
<pre>_______________________________________________
Bldg-sim mailing list
<a href="http://lists.onebuilding.org/listinfo.cgi/bldg-sim-onebuilding.org" target="_blank">http://lists.onebuilding.org/listinfo.cgi/bldg-sim-onebuilding.org</a>
To unsubscribe from this mailing list send a blank message to <a href="mailto:BLDG-SIM-UNSUBSCRIBE@ONEBUILDING.ORG" target="_blank">BLDG-SIM-UNSUBSCRIBE@ONEBUILDING.ORG</a>
</pre>
</blockquote>
</blockquote>
</div>
_______________________________________________<br>
Bldg-sim mailing list<br>
<a href="http://lists.onebuilding.org/listinfo.cgi/bldg-sim-onebuilding.org" rel="noreferrer" target="_blank">http://lists.onebuilding.org/listinfo.cgi/bldg-sim-onebuilding.org</a><br>
To unsubscribe from this mailing list send a blank message to <a href="mailto:BLDG-SIM-UNSUBSCRIBE@ONEBUILDING.ORG" target="_blank">BLDG-SIM-UNSUBSCRIBE@ONEBUILDING.ORG</a><br>
</blockquote></div>