[Equest-users] Input function with daylight factors for accurate daylighting

Busman, Michael R MBusman at chevron.com
Fri Aug 9 13:43:14 PDT 2013


Similar to John Aulbach, a frequent poster here, I started doing hourly simulations about 1982.  That was when your input file had to be chiseled on a stone tablet. :)

Mike Busman

Michael R. Busman, CEM
Lead Project Engineer II

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From: David Griffin [mailto:dgriffin at etcgrp.com]
Sent: Friday, August 09, 2013 1:30 PM
To: Busman, Michael R; Bishop, Bill; equest-users at lists.onebuilding.org
Subject: RE: [Equest-users] Input function with daylight factors for accurate daylighting


Since eQUEST utilizes a split flux calculation which averages lighting levels, it is not super accurate when it comes to daylighting. You can, however, use daylighting to approximate energy savings in eQUEST using appropriately zoned perimeters spaces and sunspaces.

If you truly want accurate daylighting in eQUEST, you're going to have to use a third party software and create an 8760 schedule within eQuest to reflect the results (I suggest using a GUI for Radiance such as AGi32).

If I knew exactly what you were trying to do and had a better sense of the geometry you are working with, I could assist you further.

Unlike Mike, the song is BEFORE my time, but I'll spare you the old guy jokes ;)


David Griffin
Energy Analyst
ETC Group, LLC
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From: Busman, Michael R [mailto:MBusman at chevron.com]
Sent: Thursday, August 08, 2013 2:56 PM
To: Bishop, Bill; equest-users at lists.onebuilding.org<mailto:equest-users at lists.onebuilding.org>
Subject: Re: [Equest-users] Input function with daylight factors for accurate daylighting


Sorry, but I can't help you out on your daylighting question.  I'm also sorry, but the song was AFTER my time.  I'm more into 60's & 70's music and boogie woogie and piano blues artists who died 50 or more years ago. :)

Mike Busman

From: equest-users-bounces at lists.onebuilding.org<mailto:equest-users-bounces at lists.onebuilding.org> [mailto:equest-users-bounces at lists.onebuilding.org] On Behalf Of Bishop, Bill
Sent: Thursday, August 08, 2013 10:25 AM
To: equest-users at lists.onebuilding.org<mailto:equest-users at lists.onebuilding.org>
Subject: [Equest-users] Input function with daylight factors for accurate daylighting

I am modeling a building with many clerestory windows of various orientations in a complex roof geometry. I would like to accurately model the daylighting savings in eQUEST. Has anyone had luck creating an input function that uses daylight illuminance factors, as described by Steve Baker<http://simulationresearch.lbl.gov/dirpubs/complex_dayltg.pdf> back when Bush Sr. was president and this song<http://www.youtube.com/watch?v=9EcjWd-O4jI> was a Top 10 hit? "Limitations of the Daylighting Calculation" and an "Example of Using Measured Daylight Factors" using an input function are described in the DOE-2 help.


William Bishop, PE, BEMP, BEAP, LEED AP | Pathfinder Engineers & Architects LLP
Senior Energy Engineer

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T: (585) 325-6004 Ext. 114            F: (585) 325-6005
bbishop at pathfinder-ea.com<mailto:wbishop at pathfinder-ea.com>           www.pathfinder-ea.com<http://www.pathfinder-ea.com/>
P   Sustainability - the forest AND the trees. P

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