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Equest, like DOE2.1e before it provides very generous estimates of the
lighting energy saved using daylighting controls. I believe that
taking equest predictions at face value for LEED models would be
inaccurately providing more benefit than warranted. The Appendix G
power factor ratings are likely not conservative in some cases. I
wouldn't expect to see any more benefit using equest's daylighting than I
would using the Appendix G power factor adjustments.<br><br>
A paper that attempted to explore various daylighting energy reduction
savings modelling strategies. DOE2.1e and Daysim are the two
programs used for the analysis.<br>
<a href="http://www.nrc-cnrc.gc.ca/obj/irc/doc/pubs/nrcc46761/nrcc46761.pdf" eudora="autourl">
http://www.nrc-cnrc.gc.ca/obj/irc/doc/pubs/nrcc46761/nrcc46761.pdf<br><br>
<br>
</a>At 03:49 PM 23/08/2010, you wrote:<br>
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Perhaps these are the answers you’re seeking:<br>
1. Building shades and their
respective reflectance properties do affect the modeled behavior of space
daylighting systems in eQuest models. Be sure to pay close
attention to all three values (and their associated help files) on the
right of the following image – they may all play a part depending on what
exactly you’re trying to model.<br>
<img src="cid:7.1.0.9.2.20100823165325.0c74a8f0@enersave.ca.2" width=592 height=441 alt="[]">
<br>
2. Based on your query, a
caution: eQuest’s results do not have any inherent degree of
accuracy/in-accuracy with regard to the modeled energy consumption
resulting from daylighting controls – that depends pretty much entirely
on how closely you define the daylighting systems’ behavior to
reality. If you have a program which you perceive to be producing
more accurate hourly percentage consumptions for your spaces, then by all
means – there’s nothing stopping you from defining a schedule in eQuest
to match the other program’s results. <br>
<br>
I expect you mean to say you’re utilizing another program to accurately
determine the behavior of daylight in response to adding/modifying light
shelves, but if you are indeed using another program to determine annual
hourly behavior with a weather file, I’d be very interested to hear more
about it!<br>
<br>
Best of luck,<br>
<br>
~Nick<br>
<br>
<img src="cid:7.1.0.9.2.20100823165325.0c74a8f0@enersave.ca.3" width=119 height=37 alt="cid:489575314@22072009-0ABB">
<br>
<b> <br>
NICK CATON, E.I.T.<br>
</b>PROJECT ENGINEER<br>
25501 west valley parkway<br>
olathe ks 66061<br>
direct 913 344.0036<br>
fax 913 345.0617<br>
<i>Check out our new web-site @
</i><a href="www.smithboucher.htm">www.smithboucher.com</a><u> <br>
</u> <br>
<b>From:</b> equest-users-bounces@lists.onebuilding.org
[<a href="mailto:equest-users-bounces@lists.onebuilding.org" eudora="autourl">
mailto:equest-users-bounces@lists.onebuilding.org</a>] <b>On Behalf Of
</b>Nilay R. Desai<br>
<b>Sent:</b> Monday, August 23, 2010 11:35 AM<br>
<b>To:</b> equest-users@lists.onebuilding.org<br>
<b>Subject:</b> [Equest-users] Modeling Light Shelves for Reduction
inCooling/Heating Load?<br>
<br>
E.G. Would it be accurate to model an external light shelve as a
horizontal building shade with a high reflectance value on the skyward
facing surface? I understand the day lighting benefit in Equest would be
inaccurate, but we are using separate software to obtain accurate day
lighting results. Thanks!<br>
<br>
<br>
Nilay Desai<br>
P 626.351.8881 Ext. 237<br>
<a href="mailto:klowe@tmadtg.com">ndesai@ttgcorp.com</a><br>
<br><br>
<br>
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<br>
Chris Jones<br>
14 Oneida Avenue<br>
Toronto, ON M5J 2E3.<br>
Tel. 416-203-7465<br>
Fax. 416-946-1005<br><br>
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