# [Equest-users] Difficult roof

John Aulbach jra_sac at yahoo.com
Sat Apr 5 14:09:11 PDT 2014

```Gentlemen:

I sent Katia an example from the eQuest wizard for which I showed her on Screen 3 where the checkbox was for a peaked roof and the way you can change the angle.This is not the Sydney Opera House roof, this can be energy corrected with a 5 or 10 degree tilt roof.

John

________________________________
From: Jeff Haberl <jhaberl at tamu.edu>
To: Joe Huang <yjhuang at whiteboxtechnologies.com>
Cc: "equest-users at lists.onebuilding.org" <equest-users at lists.onebuilding.org>
Sent: Saturday, April 5, 2014 12:45 PM
Subject: Re: [Equest-users] Difficult roof

FYI.

I think this is a waste of time for and opaque surface. Perhaps 2 or 3 surfaces will suffice as long as the area = the intended area.

This problem was studied in ASHRAE RP1468 for windows.

Jeff

Jeff S. Haberl, Ph.D., P.E., FASHRAE, FIBPSA
Department of Architecture
Texas A&M University
College Station, Texas 77845-3581
Office: 979-845-6507, Lab: 979-845-6065
Fax: 970-862-2457, jhaberl at tamu.edu, http://www.esl.tamu.edu/

On Apr 5, 2014, at 2:40 PM, "Joe Huang" <yjhuang at whiteboxtechnologies.com> wrote:

Katia, John,

I can see the attached two JPGs, so the pictures have been attached.  Looking at them, the roof looks like a very shallow barrel vault.  Since eQUEST  or any other simulation program that I know of, accepts only planar surfaces, you will have to decompose the roof into a number of strips running lengthwise.  Since these strips will be skinny rectangles, they can be input either with WIDTH, HEIGHT, TILT, etc., or as POLYGONs.  John has details on how that's done in eQUEST.

Joe

Joe Huang
White Box Technologies, Inc.
346 Rheem Blvd., Suite 108D
Moraga CA 94556 yjhuang at whiteboxtechnologies.com http://weather.whiteboxtechnologies.com/ for simulation-ready weather data
(o) (925)388-0265
(c) (510)928-2683
"building energy simulations at your fingertips"
On 4/5/2014 8:59 AM, John Aulbach wrote:
Katia:
>
>Are you sure you attached the pictures. I dont see any attachment.  I usually stay away from exotic roofs, unless a tilt is, say, in a major direction.
>
>If you really want to deal with it, you will need to create a polygon in the wall corrdinate system.for each roof section and spatially move them in the right direction using the building coordinate system . This is all in the Detail Edit mode.
>
>Do you understand the different coordinate systems? You can find the explanation in the DOE2.2 Help Menu.
>
>John R. Aulbach, PE
>
>
>From: katia mailto:katialattouf92 at hotmail.com
>To: mailto:equest-users at lists.onebuilding.org mailto:equest-users at lists.onebuilding.org
>Sent: Saturday, April 5, 2014 8:31 AM
>Subject: [Equest-users] Difficult roof
>
>
>
>Dear equest-users,
>
>I am attaching two pictures of a location I am studying.
>
>I am facing difficulties in drawing the roof in eQuest using the pitched roof section.
>
>How can I do it?
>
> Thank you for help,
>
>KL
>
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