[Equest-users] Difficult roof

[Jeff Haberl]

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<mailto:jhaberl at tamu.edu>, www.esl.tamu.edu<http://www.esl.tamu.edu>

On Apr 5, 2014, at 2:40 PM, "Joe Huang" <yjhuang at whiteboxtechnologies.com<mailto: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<mailto:yjhuang at whiteboxtechnologies.com>
http://weather.whiteboxtechnologies.com for simulation-ready weather data
(o) (925)388-0265
(c) (510)928-2683
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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 <katialattouf92 at hotmail.com><mailto:katialattouf92 at hotmail.com>
To: "equest-users at lists.onebuilding.org"<mailto:equest-users at lists.onebuilding.org> <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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