[Equest-users] The old "too much roof" dilimena

[Keith Swartz]

John,

Another method I have heard of is adjusting the U-value for the roof so that the product U*Area remains constant. The BTU's of heat transferred through the roof is the same. The roof load is not distributed correctly to the rooms below, which might be OK if it's a big open space. This method follows the principle that you aren't modeling the building, you are modeling the energy use of the building. It is usually better to model the building as closely as you can, so I prefer Bruce's method of putting an air wall under the boundary of the roof to make it easier to delete unneeded roof polygons. (An even better solution is to use software that does not have this problem!)

Keith Swartz, PE | Senior Energy Engineer
Seventhwave | Madison.Chicago.Minneapolis
608.210.7123 seventhwave.org

From: Bruce Easterbrook [mailto:bruce5 at bellnet.ca]
Sent: Tuesday, October 27, 2015 8:05 AM
To: John Aulbach <jra_sac at yahoo.com>; Equest-users <equest-users at lists.onebuilding.org>; Brian Fountain <bfountain at greensim.com>
Subject: Re: [Equest-users] The old "too much roof" dilimena

I match the zone or zones on the floor below to the footprint of the floor above.  I adjust everything in the detail wizard.
Bruce Easterbrook P.Eng.
Abode Engineering
On 26/10/2015 11:45 PM, John Aulbach wrote:
I t has been asked before but it keeps coming back like an unloved season..

Assume a 5 story building, 1st 4 floors same footprint. Last floor is smaller. If one calls out in the Wizard for a 4th floor roof to cover those portions which are exposed to atmosphere, eQuest want to put in a total floor roof, including that which is under the 5th floor. Aside from "cookie cuttering" the polygon, is there a simpler was to do it?

John R. Aulbach




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