[Equest-users] Modeling Dormers

[Bishop, Bill]

Hi Ryan,

 

I think what you have done will work, but you're not finished yet. The
geometry within geometry is not ignored. You can verify this several
ways. For example, the floor area of the sloped-roof space is probably
identical before and after adding the "brick" dormer. The conduction
loads to the space are probably identical. The solar load, however, may
be reduced due to shading by the dormer shell.

Another thing you should check is whether or not the area "inside" the
sloped roofs is conditioned or not (and that you don't just have a 1'
tall conditioned space). The last project I did with sloped roofs,
eQUEST generated an unconditioned "Under Roof" space with all the roof
surfaces assigned to it. If the conditioned volume checks out, I think
you need to make the following additions/modifications:

1.) Modify the floor polygon of the sloped-roof space to subtract the
area of the dormer.

2.) Modify the roof polygon to subtract the dormer.

3.) Add an interior wall, air-type, for the long
"geometry-within-geometry" wall, NEXT-TO the sloped-roof space.

4.) Delete the exterior wall that the interior wall replaces.

5.) Modify the other two exterior walls. Make them triangles by creating
new polygons.

 

Hope that helps,

Bill

 

William Bishop, EIT, LEED(r) AP | Pathfinder Engineers LLP

Mechanical Engineer

 

3300 Monroe Ave., Suite 306 
Rochester, NY  14618

TEL (585) 218-0730 Ext. 114
FAX (585) 218-0737 

bbishop at pathfinderengineers.com

 

www.pathfinderengineers.com

P Please consider the environment before printing this email

________________________________

From: equest-users-bounces at lists.onebuilding.org
[mailto:equest-users-bounces at lists.onebuilding.org] On Behalf Of Ryan
Lacey
Sent: Tuesday, January 13, 2009 9:24 AM
To: equest-users at lists.onebuilding.org
Subject: [Equest-users] Modeling Dormers

 

Hello,

I am attempting to model the roof & top floor of my building.  It is a
12/12 roof with intersecting dormers and a flat section of roof.  There
is no magical way to make this happen from what I can tell.  I wish
there was a "easy button" like in those commercials!    My best solution
so far has been to create a 1' tall wall & build a 12/12 roof on it.
Rather than build the roof on my 3rd floor, building the 1' wall allows
me to apply my w/sf and occupancy densities for that 1' wall floor area.
To represent the dormers and protruding geometry I plan on modeling
intersecting shells.  Is there any issue with this method?  See below
the image of the dormer and then the X-ray image showing that the brick
shaped block representing the dormer.  The block has geometry extending
into the conditioned space.  It this an issue?  Is geometry within
geometry ignored in eQUEST?  If anybody has any dormer modeling methods,
I would greatly appreciate some tips!  

 

 

       

 

 

Thanks!

 

Ryan Lacey

LEED AP

Petersen Engineering, Inc.

PO Box 4774

6 Market Square

Portsmouth, NH 03801

Phone 603.436.4233 x113

Fax 603.436.4294

www.petersenengineering.com

ryan at petersenengineering.com

 

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