<html><head><style type="text/css"><!-- DIV {margin:0px;} --></style></head><body><div style="font-family:times new roman, new york, times, serif;font-size:12pt"><DIV>Luka:</DIV>
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<DIV>That was my hope, but eQuest isn't that smart. As I was so directed by an "unimpeachable source", there IS no footcandle level until you set it in the Daylighting mode. eQuest then assumes that this is the level 100% of the lights emit. Then when you allow the Daylighting mode to run, eQuest lowers the % lighting based on how much you can gain from the skylights, side daylighting, etc.</DIV>
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<DIV>Crude but straight forward.</DIV>
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<DIV>Others can add or correct..</DIV>
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<P style="MARGIN: 0in 0in 0pt" class=MsoNormal><A name=_MailAutoSig><SPAN style="COLOR: #1f497d; mso-fareast-font-family: 'Times New Roman'; mso-fareast-theme-font: minor-fareast; mso-no-proof: yes"><FONT face=Calibri>John R. Aulbach, PE, CEM<?xml:namespace prefix = o ns = "urn:schemas-microsoft-com:office:office" /><o:p></o:p></FONT></SPAN></A></P>
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<B><SPAN style="FONT-WEIGHT: bold">From:</SPAN></B> "Matutinovic, Luka" <LMatutinovic@halsall.com><BR><B><SPAN style="FONT-WEIGHT: bold">To:</SPAN></B> Nick Caton <ncaton@smithboucher.com>; R B <slv3sat@gmail.com>; John Aulbach <jra_sac@yahoo.com><BR><B><SPAN style="FONT-WEIGHT: bold">Cc:</SPAN></B> equest-users@lists.onebuilding.org<BR><B><SPAN style="FONT-WEIGHT: bold">Sent:</SPAN></B> Thu, January 7, 2010 6:09:14 AM<BR><B><SPAN style="FONT-WEIGHT: bold">Subject:</SPAN></B> RE: [Equest-users] How does eQuest know initial FootcandlesforDaylighting Calc?<BR></FONT><BR>Nick,<BR><BR>Does this mean that there is some "baseline" fc that is provided by the<BR>electrical lighting? That is to say, eQuest will determine how many fc<BR>daylight provides and satisfy the rest with some fraction of the<BR>installed LPD? This implies that there is a relationship between LPD<BR>and fc, is that true and if so what is it or where
could I find it?<BR>Thanks,<BR><BR>Luka Matutinovic, B.A.Sc., LEED(r) AP<BR>Green Building Consultant <BR><BR>T. 416.644.0649<BR>F. 416.487.9766 <BR>Toll Free 1.888.425.7255<BR><A href="http://www.halsall.com/" target=_blank>www.halsall.com</A> <BR><BR>HALSALL ASSOCIATES LTD. <BR>Toronto Richmond Hill Ottawa Sudbury <BR>Burlington Calgary Vancouver Dubai <BR><BR>'50 Best Workplaces in Canada' <BR>2009 Globe and Mail<BR>P Please consider the environment before printing this e-mail<BR><BR><BR>-----Original Message-----<BR>From: Nick Caton [mailto:<A href="mailto:ncaton@smithboucher.com" ymailto="mailto:ncaton@smithboucher.com">ncaton@smithboucher.com</A>] <BR>Sent: Wednesday, December 30, 2009 10:27 AM<BR>To: R B; John Aulbach<BR>Cc: <A href="mailto:equest-users@lists.onebuilding.org" ymailto="mailto:equest-users@lists.onebuilding.org">equest-users@lists.onebuilding.org</A><BR>Subject: Re: [Equest-users] How does
eQuest know initial<BR>FootcandlesforDaylighting Calc?<BR><BR>The DOE2 help files suggest, if not directly, that the sensor you are<BR>placing is measuring ONLY "illuminance due to daylight," in isolation of<BR>any electrical lighting in the project. When you define a "target"<BR>illumation level (say 30fc) at a specific point/orientation, that sensor<BR>will plot the daylight measured in the same vector against a curve<BR>(specified when you select dimming control options) to determine a<BR>factor to apply to the zone's Lightig Watts/SF.<BR><BR>To my knowledge, eQuest in no manner whatsoever is attempting to perform<BR>the operations of photometric software (AGI32/Visual/LightPRO/etc).<BR><BR>~Nick<BR><BR>NICK CATON, E.I.T.<BR>PROJECT ENGINEER<BR>25501 west valley parkway<BR>olathe ks 66061<BR>direct 913 344.0036<BR>fax 913 345.0617<BR>Check out our new web-site @ <A href="http://www.smithboucher.com/" target=_blank>www.smithboucher.com</A>
<BR><BR><BR>-----Original Message-----<BR>From: <A href="mailto:equest-users-bounces@lists.onebuilding.org" ymailto="mailto:equest-users-bounces@lists.onebuilding.org">equest-users-bounces@lists.onebuilding.org</A><BR>[mailto:<A href="mailto:equest-users-bounces@lists.onebuilding.org" ymailto="mailto:equest-users-bounces@lists.onebuilding.org">equest-users-bounces@lists.onebuilding.org</A>] On Behalf Of R B<BR>Sent: Monday, December 28, 2009 4:44 PM<BR>To: John Aulbach<BR>Cc: <A href="mailto:equest-users@lists.onebuilding.org" ymailto="mailto:equest-users@lists.onebuilding.org">equest-users@lists.onebuilding.org</A><BR>Subject: Re: [Equest-users] How does eQuest know initial Footcandles<BR>forDaylighting Calc?<BR><BR>My guess is that the tool assumes the lighting wattage that you have<BR>gives the amount of footcandles specified. If 50% of this is from<BR>daylight, then remaining is from 50% of the installed lighting<BR>(translating into 50% wattage
usage).<BR>-Rohini<BR><BR>On 12/28/09, John Aulbach <<A href="mailto:jra_sac@yahoo.com" ymailto="mailto:jra_sac@yahoo.com">jra_sac@yahoo.com</A>> wrote:<BR>> LIke the Phantom of the Opera.."A mystery never fully explained.."<BR>><BR>> I have performed Daylighting savings EEMs in eQuest, where one places<BR>a<BR>> sensor in the space, one deliniates a minimum footcandle requirement,<BR>and<BR>> runs a Parametric run to determine how much lighting energy may be<BR>saved.<BR>><BR>> What is NOT clear to me is how eQuest determines what the inital<BR>footcandle<BR>> level is. It obviously knows the lighting fixture height (Ceilling or<BR>> syspended) and the geometry of existing windows, etc. But I cannot<BR>find<BR>> where the information lies that says "eQuest assumes so many<BR>lumens/watt of<BR>> certain lighting."<BR>><BR>> Can anyone "ILLUMINATE" me, please?<BR>><BR>> Hope all had a great
Christmas.<BR>><BR>> John Aulbach<BR>><BR>><BR>><BR>_______________________________________________<BR>Equest-users mailing list<BR>http://lists.onebuilding.org/listinfo.cgi/equest-users-onebuilding.org<BR>To unsubscribe from this mailing list send a blank message to<BR><A href="mailto:EQUEST-USERS-UNSUBSCRIBE@ONEBUILDING.ORG" ymailto="mailto:EQUEST-USERS-UNSUBSCRIBE@ONEBUILDING.ORG">EQUEST-USERS-UNSUBSCRIBE@ONEBUILDING.ORG</A><BR><BR></DIV></DIV><!-- cg4.c2.mail.re1.yahoo.com compressed/chunked Wed Jan 6 13:01:11 PST 2010 --></div><br>
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