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<p>I can certainly calculate the statistics, but I need some time
first for more urgent matters such as updating as well as
replacing the modeled solar on all the 2017 weather files. From
what I've seen so far, I expect the aggregate totals to change a
little for US locations because the modeled solar had already been
calibrated against satellite solar from another source in 2015,
while for Canada and Europe the changes might be from a little to
moderate, and larger still for other parts of the world. On an
hourly and even daily basis, I expect the differences to be much
larger, but who's to say that the satellite data which are on a
3-5km grid are necessarily better? Please stay tuned.</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 1/12/2018 8:21 AM, Karen Walkerman
via Bldg-sim wrote:<br>
</div>
<blockquote type="cite"
cite="mid:CAKnCpCE5015s9yxTccp2ctT8mtkzLOdcTw4N4ReX6A=qT9cyFQ@mail.gmail.com">
<div dir="ltr">Wow, Joe. This is fantastic. I'm curious if you
will be publishing statistics showing the differences in solar
radiation as calculated using the old methods versus the new
satellite data? That would instigate a very interesting
conversation indeed.
<div><br>
</div>
<div>Be well,</div>
<div><br>
</div>
<div>Karen<br>
<br>
<div class="gmail_quote">
<div dir="ltr">On Thu, Dec 14, 2017 at 9:14 PM Joe Huang <a
href="mailto:YJHuang@whiteboxtechnologies.com"
moz-do-not-send="true">YJHuang@whiteboxtechnologies.com</a>
[EnergyPlus_Support] <<a
href="mailto:EnergyPlus_Support@yahoogroups.com"
moz-do-not-send="true">EnergyPlus_Support@yahoogroups.com</a>>
wrote:<br>
</div>
<blockquote class="gmail_quote" style="margin:0 0 0
.8ex;border-left:1px #ccc solid;padding-left:1ex">
<div style="background-color:#fff">
<span style="display:none"> </span>
<div id="m_7905905964149326405ygrp-mlmsg">
<div id="m_7905905964149326405ygrp-msg">
<div id="m_7905905964149326405ygrp-text">
<p> </p>
<p>It is with joy and some trepidation to report
that White Box Technologies (WBT) is updating
all its historical weather files with
satellite-derived solar radiation. Joy because
this overcomes what has been the most
significant question mark with weather files;
trepidation because of the amount of work needed
to carry out and maintain this effort. To show
that this is more than marketing hype, I need to
give a rather long explanation about this
development.<br>
<br>
The bane of weather data over the past three
decades has been the solar radiation (global
horizontal and direct normal) which are not
measured parameters, but derived using various
solar and sky models. All the familiar "typical
year" sets, i.e., TMY, WYEC, IWEC, etc., let
alone the historical weather files, have modeled
solar radiation. Although a lot of<br>
work has gone into such models (see M. Iqbal,"An
Introduction to Solar Radiation", Academic
Press, 1983), there remain an almost intractible
problem of the lack of good measured solar to
tune any of these models. For example, in the
ASHRAE IWEC2 weather files, my team was able to
find one or two years' measured data for less
than 50 locations,<br>
from which were derived 28 sets of regression
coefficients then used for all 3,012 IWEC2
locations.<br>
<br>
For the past decade and a half, researchers
around the world have been working to derive
solar radiation from weather satellite imagery,
driven largely by the needs of the solar power
industry for the siting of solar power plants
and getting "bankable" solar estimates for their
arrays. Our little building energy simulation
sector can of course benefit by hanging on the
coattails of the solar power industry, but the
downside has been to be totally priced out,
since the commercial cost for one year's solar
data for one location (grid cell) typically runs
around $1,000.<br>
<br>
A welcome development over the last five years
is that various government offices or affiliated
consortia are now beginning to also providing
access to satellite-derived solar radiation at
minimal or more acceptable costs under various
conditions. Over the past three years, WBT has
obtained access to such data and permission for
its use in WBT weather files.<br>
WBT is now either replacing the solar radiation
on its historical weather files, or using
satellite-derived radiation to develop custom
solar coefficients for each location to extend
the satellite-derived solar to time periods
outside the available time window. With the
exception of polar locations above or below
60/66 degrees, island nations in the Pacific and
Indian Ocean, and a few unfortunate "blind
spots", the entire land mass is being covered
with at least 10 years up to 18 years of hourly
solar records.<br>
<br>
Starting in 2018, WBT historical weather files
in the following areas will all have
satellite-derived solar radiation for the
following time periods: Europe, Africa, South
America east of 66 West, i.e., Brazil and
Uruguay (2004 to date), Australia (1999 to
date), and East Asia (2007 to date, access
pending). WBT historical weather files in the
following areas will have satellite-derived
solar radiation for the indicated time periods -
North America and Central/South American down to
20 South (1998-2015), South Asia (2000-2014),
with modeled solar radiation from 2016 on that
has been individually tuned to the past
satellite-derived solar.<br>
<br>
Another benefit to the satellite-derived solar
is to increases the number of available weather
stations, which in many places has been limited
by the lack of cloud cover data needed to model
the solar radiation. For reasons that are not
immediately identifiable, several
English-speaking Commonwealth countries has seen
a marked drop in the number of available
stations due to the decreases in the reporting
of cloud cover (see plot, ZAF = South Africa).
For example, the number of stations in the UK
has dropped by almost 2/3s between 2001 and 2017
(174 to 64), but with satellite-derived solar,
it will go back up to over 180, while in
Australia and South Africa the comparable
numbers are from 175 to well over 500, and from
37 to over 100, respectively.<br>
</p>
<img
src="cid:part3.DEB7958E.9FE9DDD3@whiteboxtechnologies.com"
alt="eppffpmojkhpmhbo.png" class=""
style="max-width: 100%;"><br>
If interested, customers who have purchased a
historical weather files from WBT over the past
five years can get an updated weather file at no
cost. Lastly, although it will take at least a
month to update all 10,000 2017 files, it's very
quick to do for any specific location or even 50
or so locations. Therefore, if you have an urgent
request please e-mail me and I will put that at
the beginning of the queue for that day.<br>
<pre class="m_7905905964149326405moz-signature" cols="90">--
Joe Huang
White Box Technologies, Inc.
<a href="https://maps.google.com/?q=346+Rheem+Blvd.,+Suite+205A%0D+Moraga+CA+94556&entry=gmail&source=g" moz-do-not-send="true">346 Rheem Blvd., Suite 205A
Moraga CA 94556</a>
<a class="m_7905905964149326405moz-txt-link-abbreviated" href="mailto:yjhuang@whiteboxtechnologies.com" target="_blank" moz-do-not-send="true">yjhuang@whiteboxtechnologies.com</a>
<a class="m_7905905964149326405moz-txt-link-freetext" href="http://weather.whiteboxtechnologies.com" target="_blank" moz-do-not-send="true">http://weather.whiteboxtechnologies.com</a> for simulation-ready weather data
(o) <a href="tel:%28925%29%20388-0265" value="+19253880265" target="_blank" moz-do-not-send="true">(925)388-0265</a>
(c) <a href="tel:%28510%29%20928-2683" value="+15109282683" target="_blank" moz-do-not-send="true">(510)928-2683</a>
"building energy simulations at your fingertips"
</pre>
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