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<DIV><SPAN class=760105317-26092001><FONT face=Arial color=#0000ff
size=2>Jon,</FONT></SPAN></DIV>
<DIV><SPAN class=760105317-26092001><FONT face=Arial color=#0000ff
size=2></FONT></SPAN> </DIV>
<DIV><SPAN class=760105317-26092001><FONT face=Arial color=#0000ff
size=2>SkyCalc is simple to use tool to look at daylighting potential from
skylights and daylight harvesting controls potentials. SkyCalc is an Excel
spreadsheet that uses preprocessed DOE-2 hourly outputs to generate energy
savings estimates for different fractions of roof area covered with skylights
and under different lighting control strategies.</FONT></SPAN></DIV>
<DIV><SPAN class=760105317-26092001><FONT face=Arial color=#0000ff
size=2></FONT></SPAN> </DIV>
<DIV><SPAN class=760105317-26092001><FONT face=Arial color=#0000ff
size=2>SkyCalc is free and is available with climate specific "weather files"
for 34 locations. SkyCalc can be downloaded from <A
href="http://www.h-m-g.com">www.h-m-g.com</A>.</FONT></SPAN></DIV>
<DIV><SPAN class=760105317-26092001><FONT face=Arial color=#0000ff
size=2></FONT></SPAN> </DIV>
<DIV><SPAN class=760105317-26092001>
<P><FONT face=Arial color=#000000 size=2>Jon McHugh</FONT><FONT face=Arial
color=#000000 size=2>, PE, LC</FONT> <BR><FONT face=Arial color=#000000
size=2>Heschong Mahone Group</FONT> <BR><FONT face=Arial color=#000000
size=2>11626 Fair Oaks Blvd #302</FONT> <BR><FONT face=Arial color=#000000
size=2>Fair Oaks, CA 95628 (Sacramento)</FONT> <BR><FONT face=Arial
color=#000000 size=2>(916)962-7001</FONT> <BR><FONT face=Arial color=#000000
size=2>(916)962-0101 FAX</FONT> <BR><FONT face=Arial color=#000000
size=2>e-mail: mchugh@h-m-g.com</FONT> <BR><FONT face=Arial color=#000000
size=2>URL: www.h-m-g.com</FONT> </P></SPAN></DIV>
<BLOCKQUOTE dir=ltr style="MARGIN-RIGHT: 0px">
<DIV class=OutlookMessageHeader dir=ltr align=left><FONT face=Tahoma
size=2>-----Original Message-----<BR><B>From:</B> Jon Maxwell
[mailto:jmaxwell@aspensys.com]<BR><B>Sent:</B> Wednesday, September 26, 2001
8:55 AM<BR><B>To:</B> BLDG-SIM@gard.com<BR><B>Cc:</B>
BLDG-SIM@GARD.COM<BR><B>Subject:</B> [BLDG-SIM] Fraction of Possible
Sunshine<BR><BR></FONT></DIV>
<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 type="cite" 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>
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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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