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<DIV><FONT face=Arial size=2>I wanted to compare FPS plots against
radiation plots so I could learn more about their correlation (or lack
thereof) in different locales. I planned to use one or the other to
help me get a sense for possible regional variation in daylighting/dimming
controls savings potential. I had a lot easier time finding radiation
data, if it is any consolation to you in your mission, Chip. but I
thought sunshine data would be better to use if available. Tabular
data is better for quantitative analysis of course, but I wanted to
see pictures.</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>FYI two good sources for solar radiation plots
are:</FONT>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2> - </FONT><A
href="http://www.homepower.com/solmap.htm"><FONT face=Arial
size=2>http://www.homepower.com/solmap.htm</FONT></A><FONT face=Arial
size=2> </FONT></DIV>
<DIV><FONT face=Arial size=2> for an
annual plot (attractive training illustration),</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2> - <A
href="http://rredc.nrel.gov/solar/old_data/nsrdb/redbook/atlas/Table.html">http://rredc.nrel.gov/solar/old_data/nsrdb/redbook/atlas/Table.html</A> </FONT></DIV>
<DIV><FONT face=Arial size=2> for
monthly plots by various orientations ( a better analytical tool).</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV></DIV>
<DIV><FONT face=Arial size=2>Not to be too contrary but I spot-checked the
tabular data from the source in my original email with the homepower map above
and the general patterns do seem to correlate pretty well. </FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>Finally, for those of you that are interested, Jeff
Haberl responded to me directly with a FPS resource: "<FONT face=Arial
size=2><SPAN class=511452200-26092001>I believe that there is a map on Kreith
and Kreider's Solar energy handbook...that </SPAN></FONT><FONT face=Arial
size=2><SPAN class=511452200-26092001>shows this for the world...using the
Angstrom-Lof minutes of sunshine." Thanks to
Jeff.</SPAN></FONT></FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV style="FONT: 10pt arial">----- Original Message -----
<DIV style="BACKGROUND: #e4e4e4; font-color: black"><B>From:</B> <A
title=cbarnaby@wrightsoft.com href="mailto:cbarnaby@wrightsoft.com">Chip
Barnaby</A> </DIV>
<DIV><B>To:</B> <A title=jmaxwell@aspensys.com
href="mailto:jmaxwell@aspensys.com">Jon Maxwell</A> </DIV>
<DIV><B>Cc:</B> <A title=BLDG-SIM@GARD.COM
href="mailto:BLDG-SIM@GARD.COM">BLDG-SIM@GARD.COM</A> </DIV>
<DIV><B>Sent:</B> Wednesday, September 26, 2001 9:12 AM</DIV>
<DIV><B>Subject:</B> Re: [BLDG-SIM] Fraction of Possible Sunshine</DIV></DIV>
<DIV><FONT face=Arial size=2></FONT><BR></DIV>Jon --<BR><BR>I don't know of a
source for a map, but I do have a question ... what do you want it for?<BR><BR>I
am trying to learn how people use this statistic. It has been
traditionally observed, so people keep observing it. I am involved in work
on ASHRAE TC 4.2 (Weather Information) that is developing methods for extracting
solar radiation from weather data measured by ASOS (Automated Surface
Observation System) now used to observe weather at most sites in the US.
ASOS has planned to add sunshine meters to their machines (that plan is now
delayed due to funding), but it would be just about as easy, and much more
useful (in our opinion) to measure solar radiation. Sunshine fraction is a
notoriously bad predictor of solar radiation (the correlations are pretty
poor). With trivial data processing, minute-by-minute solar radiation data
can be used to estimate sunshine, but not vice-versa.<BR><BR>Thus as far as I
know the solar and building simulation community has no use for sunshine data --
the statistic should be declared obsolete from our point of view. However,
at every opportunity, I try to find why people want it, there may be some other
uses that we don't know about.<BR><BR>So, if you're willing, please let me know
what you're up to.<BR><BR>To the rest of BLDG-SIM: anyone else know of uses for
sunshine fraction?<BR><BR>Thanks, Chip Barnaby<BR><BR>
<BLOCKQUOTE class=cite cite type="cite"><FONT face=arial size=2>Does anyone
out there have or know of a source for a graphical illustration of Fraction of
Possible Sunshine over the U.S. I found a very good table of such data
at <A
href="http://cdiac.esd.ornl.gov/ftp/ndp021/">http://cdiac.esd.ornl.gov/ftp/ndp021/</A>
(file #12), but haven't had any luck with a map. Thanks in
advance.</FONT><BR> <BR><FONT face=arial size=2>Jon Maxwell,
PE</FONT><BR><FONT face=arial size=2>Aspen Systems Corp.</FONT><BR><FONT
face=arial size=2><A
href="mailto:jmaxwell@aspensys.com">jmaxwell@aspensys.com</A></FONT>
<BR> <BR> <BR><BR><PRE>
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</PRE><FONT face="Courier New, Courier"></BLOCKQUOTE><X-SIGSEP>
<P></X-SIGSEP>---------------------------------------------------------<BR>Chip
Barnaby
cbarnaby@wrightsoft.com<BR>Vice President of Research<BR>Wrightsoft
Corp.
781-862-8719 x118 voice<BR>394 Lowell St, Suite
12 781-861-2058 fax<BR>Lexington, MA
02420 <A
href="http://www.wrightsoft.com/" eudora="autourl">www</A>.wrightsoft.<A
href="http://www.wrightsoft.com/"
eudora="autourl">com<BR></A>---------------------------------------------------------</FONT>
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