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

[Sami, Vikram]

Couple of suggestions:


1.       Run the model in IES - I think they have a better daylight algorithm.

2.       Use Daysim  - you can get hourly light level readings from Daysim that you can postprocess to create a lighting schedule in eQUEST. This is probably fairly labor intensive.

Vikram Sami
Associate Partner



ZGF ARCHITECTS LLP
T 206.521.3509 E vikram.sami at zgf.com
925 Fourth Avenue, Suite 2400
Seattle, WA 98104


From: equest-users-bounces at lists.onebuilding.org [mailto:equest-users-bounces at lists.onebuilding.org] On Behalf Of Bishop, Bill
Sent: Friday, August 09, 2013 1:42 PM
To: David Griffin; 'Busman, Michael R'; equest-users at lists.onebuilding.org
Subject: Re: [Equest-users] Input function with daylight factors for accurate daylighting

David,
You can get a sense of the clerestory windows, curtain walls etc. in these views. Obviously, this will be fun geometry in eQUEST. The design team is also modeling it in IES-VE - I will see if they can get me their daylighting output for comparison.

[cid:image001.png at 01CE9849.24A8CD40]
[cid:image002.png at 01CE9849.24A8CD40]

~Bill

From: David Griffin [mailto:dgriffin at etcgrp.com]
Sent: Friday, August 09, 2013 4:30 PM
To: 'Busman, Michael R'; 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

Bill,

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 ;)

Thanks,

David Griffin
Energy Analyst
ETC Group, LLC
801.278.1927 ext. 128
Cell 480.235.0899
Fax 801.486.0668
dgriffin at etcgrp.com<mailto:dgriffin at etcgrp.com>

[cid:image003.jpg at 01CE9849.24A8CD40]
1997 South 1100 East, Suite 201, Salt Lake City, UT 84106-4471 - www.etcgrp.com<http://www.etcgrp.com/>
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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

Bill,

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.

Thanks,
Bill

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

134 South Fitzhugh Street                 Rochester, NY 14608
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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