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<DIV><SPAN class=198122313-22012004><FONT face=Arial color=#0000ff size=2>Dear
Varkie,</FONT></SPAN></DIV>
<DIV><SPAN class=198122313-22012004><FONT face=Arial color=#0000ff
size=2></FONT></SPAN> </DIV>
<DIV><SPAN class=198122313-22012004><FONT face=Arial color=#0000ff size=2>I
agree with Jon that </FONT></SPAN></DIV>
<DIV><SPAN class=198122313-22012004><FONT face=Arial color=#0000ff size=2>(a)
Sensor placement has a huge impact on the results.</FONT></SPAN></DIV>
<DIV><SPAN class=198122313-22012004><FONT face=Arial color=#0000ff size=2>(b) I
wouldn't expect that [not providing a geometry] would be an acceptable
method since you really do not know what you are
modeling. </FONT></SPAN></DIV>
<DIV><SPAN class=198122313-22012004><FONT face=Arial color=#0000ff
size=2></FONT></SPAN> </DIV>
<DIV><SPAN class=198122313-22012004><FONT face=Arial color=#0000ff size=2>With
respect to your earlier question I believe that even if you do provide geometry
data, DOE2 saving predictions will be on the optimistic side. One flaw of
basically all simulation programs that predict electric lighting savings due to
lighting controls is that they tend to compare an ideally dimmed lighting system
with a lighting system as is permanently switched on during occupied hours. This
leads to overly optimistic savings, as the IESNA handbook rightfully states: "an
undimmed lighting system with a regular on/off wall switch should be the
reference system". To be able to compare results to manually controlled
lighting, you need a user behavior model that predicts how individuals interact
with their manual lighting controls. </FONT></SPAN><SPAN
class=198122313-22012004><FONT face=Arial color=#0000ff
size=2>Another aspect you should pay attention to is the blind
control algorithm. If the blinds are permanently retracted, you will again
predict wildly overoptimistic savings. I think there is a way in DOE2 to set the
blind control to manual.</FONT></SPAN></DIV>
<DIV><SPAN class=198122313-22012004><FONT face=Arial color=#0000ff
size=2></FONT></SPAN> </DIV>
<DIV><SPAN class=198122313-22012004><FONT face=Arial color=#0000ff size=2>If you
want to develop a feeling for electric lighting savings due to controls, you
might want to use the Lightswitch Wizard, <A
href="http://www.buildwiz.com">www.buildwiz.com</A>, a simple online
daylighting analysis tool that is based on pre-calculated RADIANCE simulations
and a manual lighting control model. The model has been developed based on field
data from several countries and is currently further refined within
International Energy Agency's Task 31, Daylight Buildings in the 21st
Century.</FONT></SPAN></DIV>
<DIV><SPAN class=198122313-22012004></SPAN><SPAN class=198122313-22012004><FONT
face=Arial color=#0000ff size=2></FONT></SPAN> </DIV>
<DIV><SPAN class=198122313-22012004><FONT face=Arial color=#0000ff
size=2>Christoph</FONT></SPAN></DIV>
<DIV><SPAN class=198122313-22012004><FONT face=Arial size=1>Christoph Reinhart,
Ph.D.
tel: (613) 993-9703</FONT> <BR><FONT face=Arial><FONT size=-2>Research
Officer
fax: (613) 954-3733</FONT></FONT> <BR><FONT face=Arial><FONT size=-2>Institute
for Research in Construction e-mail:
christoph.reinhart@nrc-cnrc.gc.ca</FONT></FONT> <BR><FONT face=Arial><FONT
size=-2>National Research Council
Canada 1200 Montreal Road M-24,
Ottawa</FONT></FONT> <BR><FONT face=Arial><FONT size=-2>Ontario K1A 0R6
Canada</FONT></FONT>
<P><U><FONT face=Arial><FONT size=-2>Daylighting Analysis
Software:</FONT></FONT></U> <BR><FONT face=Arial><FONT size=-2>The Lightswitch
Wizard (initial design) <U><A
href="http://www.buildwiz.com/lightswitch/index.cfm"><FONT
color=#800080>www.buildwiz.com</FONT></A></U></FONT></FONT> <BR><FONT
face=Arial><FONT size=-2>DAYSIM (expert
software)
<U><FONT color=#000000><A
href="outbind://26/www.daysim.com">www.daysim.com</A></FONT></U></FONT></FONT><U><FONT
face=Arial><FONT color=#000000><FONT size=-2><A
href="outbind://26/www.daysim.com"></A></FONT></FONT></FONT></U>
<P><FONT face=Arial><FONT color=#000000><FONT size=-2>IEA Task
31
<A
href="http://www.iea-shc.org/task31/">http://www.iea-shc.org/task31/</A></FONT></FONT></FONT>
</P></SPAN></DIV>
<DIV><SPAN class=198122313-22012004><FONT face=Arial color=#0000ff
size=2></FONT></SPAN> </DIV>
<DIV><SPAN class=198122313-22012004><FONT face=Arial color=#0000ff
size=2></FONT></SPAN> </DIV>
<DIV class=OutlookMessageHeader dir=ltr align=left><FONT face=Tahoma
size=2>-----Original Message-----<BR><B>From:</B> Varkie Thomas
[mailto:Varkie.Thomas@som.com]<BR><B>Sent:</B> Wednesday, January 21, 2004 4:37
PM<BR><B>To:</B> BLDG-SIM@GARD.COM<BR><B>Subject:</B> [BLDG-SIM] Day-Lighting
and DOE2.1E<BR><BR></FONT></DIV>
<DIV class=Section1>
<P class=MsoNormal><FONT face="Times New Roman" color=navy size=3><SPAN
style="FONT-SIZE: 12pt; COLOR: navy">Can day-lighting controls be considered for
LEED certification under "Energy & Atmosphere - Optimize Energy
Performance"? If so where should the light sensor be located in the space?
Is there any energy code that allows credit for day-lighting controls? The
DOE2 program allows two light sensors per space. Supposing the two sensors
are located 5 ft and 10 ft from the window. Is the average daylight at
these two points used in determining the reduction in artificial
lighting?</SPAN></FONT></P>
<P class=MsoNormal><FONT face="Times New Roman" color=navy size=3><SPAN
style="FONT-SIZE: 12pt; COLOR: navy"></SPAN></FONT> </P>
<P class=MsoNormal><FONT face="Times New Roman" color=navy size=3><SPAN
style="FONT-SIZE: 12pt; COLOR: navy">The DOE2 program expects zones to have 6
surfaces defined with X,Y,Z coordinates and reflectance values for day-lighting
analysis. Ignoring this produces warning messages but the results show a
reduction in artificial lighting energy. For day-lighting analysis we only
enter into DOE2 the X,Y coordinates of the window origin relative to the wall
and also the wall and window dimensions. Can we assume that the energy
savings results from the DOE2 program are on the safe side (the actual energy
saved is more) when we use the program without all the surfaces and
coordinates?</SPAN></FONT></P>
<P class=MsoNormal><FONT face="Times New Roman" color=navy size=3><SPAN
style="FONT-SIZE: 12pt; COLOR: navy"></SPAN></FONT> </P>
<P class=MsoNormal><FONT face="Times New Roman" color=navy size=3><SPAN
style="FONT-SIZE: 12pt; COLOR: navy">Are there any rules for day-lighting
analysis for establishing energy savings and for comparing the results from
different studies?</SPAN></FONT></P>
<P class=MsoNormal><FONT face="Times New Roman" color=navy size=3><SPAN
style="FONT-SIZE: 12pt; COLOR: navy"></SPAN></FONT> </P>
<P class=MsoNormal><FONT face="Times New Roman" color=navy size=3><SPAN
style="FONT-SIZE: 12pt; COLOR: navy">Varkie Thomas</SPAN></FONT></P>
<P class=MsoNormal><FONT face="Times New Roman" color=navy size=3><SPAN
style="FONT-SIZE: 12pt; COLOR: navy">Skidmore, Owings & Merrill
LLP</SPAN></FONT></P>
<P class=MsoNormal><FONT face="Times New Roman" color=navy size=3><SPAN
style="FONT-SIZE: 12pt; COLOR: navy">Tel: (312) 360-4467
(direct)</SPAN></FONT></P></DIV><PRE>
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