[Equest-users] light tubes and light wells

[Umesh Atre]

Vikram & Nick, you are both correct. 
I suggested creating the new roof surface with the 'Skylt Roof
Construction' (this is a construction in the library with U-value
0.001), and
attaching it to the core space vs the plenum for the same reasons that
you mention.
Thanks
 
 
 
 

________________________________

From: Sami, Vikram [mailto:Vikram.Sami at perkinswill.com] 
Sent: Tuesday, January 24, 2012 12:56 PM
To: Nick Caton; Umesh Atre; norman wheatley;
equest-users at lists.onebuilding.org
Subject: RE: [Equest-users] light tubes and light wells



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

 

 

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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