[Equest-users] change roof construction to glass

[Nick Caton]

Pasha,

 

I may be missing something, I think you may have incidentally answered
how this can be done without realizing it =)?

 

1.       Define a roof construction to match the thermal
massing/conductive properties of the glass framing.

2.       Define and assign roof skylights (check all inputs against your
ceiling glass info) as required to match the percentage coverage (minus
the framing) of the glass for the construction.  You can do this quickly
in the Wizards by defining % or define and locate with more precision in
detailed.  

3.       I don't' believe exact positioning on any given roof section is
necessary if you have no daylighting controls to model or elements
shading these skylights.

 

Thermals and daylighting controls should be accounted for and affected
correctly using skylights - if you have any building shades/elements
above the glass roof plane be sure to locate them and the skylights
accurately to model their shading effects correctly.

 

In Lauren's case with an irregular polygon, I don't believe you have any
recourse but to specify a series of rectangles.  I think you'll find
however creating and positioning skylights in detailed to be easier than
you might think, if you haven't tried already.  I always suggest saving
often and separately when going through any detailed window relocations
- things can sometimes go awry if you have a frame falling outside the
parent construction boundaries, for example.

 

~Nick

 

 

NICK CATON, E.I.T.

PROJECT ENGINEER

25501 west valley parkway

olathe ks 66061

direct 913 344.0036

fax 913 345.0617

Check out our new web-site @ www.smithboucher.com 

 

From: equest-users-bounces at lists.onebuilding.org
[mailto:equest-users-bounces at lists.onebuilding.org] On Behalf Of Pasha
Korber-Gonzalez
Sent: Thursday, May 06, 2010 11:27 AM
To: Lauren Rosenthal
Cc: equest-users at lists.onebuilding.org
Subject: Re: [Equest-users] change roof construction to glass

 

Lauren,

 

I don't think you can do what you are trying to achieve in eQuest/DOE2.
There's a couple things to think about.  You could effectively assign
the thermal properties of your roof construction to that of your glazing
(i.e. U-value, reflectance, etc.) but you will not be able to simulate
the solar gain properties or VLT unless the object is specified as a
window or skylight.  If you go this route you will also not be able to
simulate daylight harvesting from the roof glass either.  DOE2 needs to
know that it is a window or skylight in order for the daylighting
controls to work.

 

I would suggest maybe 2 options to try: 1) You can input skylights to
cover the greatest percentage of your roof area that will fit within the
geometry that you describe and still get some amount of glass roof
effects accounted for in your simulation although we know it won;t be
100% accurate for the proposed design.  2) you can do all of these
thermal effect calculations outside of eQuest and use your calculated
data to integrate these numbers with your simulation output---this is a
much more tedious approach and you will have to rely on your manual
engineering analysis to describe the anticipated thermal results that
can't be simulated within the program.

 

Hope this helps.

Pasha

On Thu, May 6, 2010 at 10:16 AM, Lauren Rosenthal <
Lauren.Rosenthal at arup.com> wrote:

All,

 

Does anyone know how to change an existing roof in detailed mode of the
model to a glass roof? It is an irregular shape (from a polygon) and
therefore creating child windows all over it will be very hard because
they will not fit in the shape very easily as rectangular windows. Can I
change its properties in the .inp file?

 

Thanks in advance,

 

____________________________________

Lauren Rosenthal

Mechanical Engineer

 

Los Angeles CA

 

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