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<DIV><FONT color=#000080 size=2 face=Arial>Hello Aviruch,</FONT></DIV>
<DIV><FONT color=#000080 size=2 face=Arial></FONT> </DIV>
<DIV><FONT color=#000080 size=2 face=Arial>Yes, there are models available for
estimating the separate components of direct and diffuse when the horizontal
global is known. An initial question on this would be: did you do
measurements of hourly values or daily? I have a rudimentary model
that I am willing to share with you that separates hourly global into direct and
horizontal diffuse. (The algorithms are written in BASIC and
FORTRAN.) Some recent work on this has also been done by the ASHRAE
technical committee (TC-4.2, Climatic Information) that you can likely get
access to.</FONT></DIV>
<DIV><FONT color=#000080 size=2 face=Arial></FONT> </DIV>
<DIV><FONT color=#000080 size=2 face=Arial>On the second question, because all
solar radiation will impact a building's energy consumption, it will also
be a noticeable factor in the building's energy simulation results. You
should be seeing effects on both cooling and heating loads, or, if you are
examining strictly passive measures, you should be seeing effects on the
building's internal temperatures.</FONT></DIV>
<DIV><FONT color=#000080 size=2 face=Arial></FONT> </DIV>
<DIV><FONT color=#000080 size=2 face=Arial>Regards,</FONT></DIV>
<DIV><FONT color=#000080 size=2 face=Arial></FONT> </DIV>
<DIV><FONT color=#000080 size=2 face=Arial>LOD</FONT></DIV>
<DIV><FONT color=#000080 size=2
face=Arial>===================================<BR>Larry O. Degelman,
P.E. <A
title="mailto:ldegelman@suddenlink.net
CTRL + Click to follow link"
href="mailto:ldegelman@suddenlink.net">ldegelman@suddenlink.net</A><BR>Professor
Emeritus of Architecture<BR>Texas A&M
University<BR>===================================</FONT></DIV>
<DIV style="FONT: 10pt Tahoma">
<DIV><BR></DIV>
<DIV style="BACKGROUND: #f5f5f5">
<DIV style="font-color: black"><B>From:</B> <A title=aviruchbhatia@yahoo.co.in
href="mailto:aviruchbhatia@yahoo.co.in">aviruch bhatia</A> </DIV>
<DIV><B>Sent:</B> Friday, March 20, 2009 12:25 PM</DIV>
<DIV><B>To:</B> <A title=bldg-sim@lists.onebuilding.org
href="mailto:bldg-sim@lists.onebuilding.org">bldg-sim@lists.onebuilding.org</A>
</DIV>
<DIV><B>Subject:</B> [Bldg-sim] Role of Global Solar radiation in
Simulation</DIV></DIV></DIV>
<DIV><BR></DIV>
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<DIV>Dear all,</DIV>
<DIV> </DIV>
<DIV>We are working on a project in which we measured the actual global
solar horizontal radiation through out an year. Can we know the direct
normal and/or diffuse horizontal radiation from the available global
radiation value. </DIV>
<DIV>Upon changing the global radiation, we haven't found any effect on
the energy consumption of a building which is modeled in
Designbuilder and EnergyPlus using .epw weather file. Does global
horizontal radiation have any affect in energy simulation, if yes,
please let us know the output parameters which are affected by this
variable?</DIV>
<DIV> </DIV>
<DIV>Thanks and regards<BR>Aviruch Bhatia<BR>M. Tech. (Final
Year)<BR>Energy Engineering<BR>Malaviya National Institute of Technology,
Jaipur</DIV></TD></TR></TBODY></TABLE><BR><!--6-->
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