[Equest-users] light tubes and light wells

[Sami, Vikram]

I was thinking exactly along the lines of Nick - if you have a plenum you need to create a dummy roof to house you light tube. Just another thing to add - the wall that you host this light tube on is going to behave like it was a roof to the space (in terms of conductance) so you probably want to create a material that makes it close to adiabatic (high R-value material)


Vikram Sami, LEED AP BD+C
Sustainable Design Analyst
1315 Peachtree St. NE, Atlanta, GA 30309
t: 404-443-7462    f: 404.892.5823       e: vikram.sami at perkinswill.com   www.perkinswill.com<http://www.perkinswill.com/>
Perkins+Will.  Ideas + buildings that honor the broader goals of society


From: equest-users-bounces at lists.onebuilding.org [mailto:equest-users-bounces at lists.onebuilding.org] On Behalf Of Nick Caton
Sent: Tuesday, January 24, 2012 12:31 PM
To: Umesh Atre; norman wheatley; equest-users at lists.onebuilding.org
Subject: Re: [Equest-users] light tubes and light wells

Umesh/Norm:

An extra thought:   Don't count on daylight moving between/across spaces... If your window is in roof surface that's a child of a plenum space, I believe the light will only be measurable in the plenum for daylighting control purposes.

An approach for detailed mode that may be instructive for core spaces remote from the exterior:  If your core space does not already have an exterior surface defined, you will want to create one to host the window.  It could be a wall/roof... don't think it really matters.  Play with this exterior surface's location/dimensions/orientation until it is situated above and parallel to your roof surface above, then create a window within this remote exterior surface.  Light should then "jump" to the core space, bypassing any plenums or other spaces along the way.

Best of luck!
~Nick
[cid:image001.jpg at 01CCDA97.941039F0]

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

From: equest-users-bounces at lists.onebuilding.org [mailto:equest-users-bounces at lists.onebuilding.org] On Behalf Of Umesh Atre
Sent: Tuesday, January 24, 2012 10:16 AM
To: norman wheatley; equest-users at lists.onebuilding.org
Subject: Re: [Equest-users] light tubes and light wells

Norm,
Is your simulation going through successfully? Typically, just creating a skylight in an existing roof (which I am guessing is currently attached to your core plenum space) gives you an error.
You will have to create a new roof for the core space, use 'Skylt Roof Construction' as the construction, and then create the skylight in this new roof. See if this works.
Regards,
Umesh



________________________________
From: equest-users-bounces at lists.onebuilding.org [mailto:equest-users-bounces at lists.onebuilding.org] On Behalf Of norman wheatley
Sent: Saturday, January 21, 2012 6:07 PM
To: equest-users at lists.onebuilding.org
Subject: [Equest-users] light tubes and light wells
Hi,

I'm trying to model a light tube and a light well in eQuest. I'd like to bring light into the core and maybe a lower level and have this reduce the lighting required.

so, I create a window in the roof, change the window to "Tubular Daylighting device" and have a daylighting sensor in the space below (a core zone).
But there is no effect on the lighting energy. This is the same if I use a skylight (aka a light well).

Has anyone used this successully?

thanks
Norm

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