[Equest-users] Daylight and Overhangs

[Nick Caton]

On the surface, I think we can agree nothing you're describing in the
model setup sounds wrong, and the overhangs should intuitively have an
effect on the area lighting consumptions for spaces with daylighting
control.

Oftentimes, setting up parametric runs to modify a targeted variable can
be the source of this kind of issue... I would advise also uploading any
.prd/.pd2 and your weather file so the whole project could be looked at.

~Nick

NICK CATON, P.E.
SENIOR ENGINEER

Smith & Boucher Engineers
25501 west valley parkway, suite 200
olathe, ks 66061
direct 913.344.0036
fax 913.345.0617
www.smithboucher.com 


-----Original Message-----
From: equest-users-bounces at lists.onebuilding.org
[mailto:equest-users-bounces at lists.onebuilding.org] On Behalf Of Sami,
Vikram
Sent: Monday, June 13, 2011 9:27 PM
To: Kimberly Wiebe; equest-users at lists.onebuilding.org
Subject: Re: [Equest-users] Daylight and Overhangs

Could you attach the inp file?

________________________________
From: equest-users-bounces at lists.onebuilding.org
[equest-users-bounces at lists.onebuilding.org] On Behalf Of Kimberly Wiebe
[Kimberly.Wiebe at BuroHappold.com]
Sent: Monday, June 13, 2011 6:57 PM
To: equest-users at lists.onebuilding.org
Subject: [Equest-users] Daylight and Overhangs

Hello,


I am working on a facade optimization project. I simulated the same
building with many different overhang depths and saw zero change in the
lighting energy use between the iterations. I understand that eQuest
daylighting calculations are not the best, but should the depth of the
overhang not make an impact on lighting energy if my space uses daylight
sensors? All other end uses show variation with the changing overhang
depth. Sensors are at 10' and 20' from the window with a minimum light
level of 25fc. Each sensor controls half of the space's artificial
lights, which is set to 0.55W/sf.
Please let me know if you have any insight on the effect of an overhang
on available daylight. Thank you.


Kim

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