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

[Nicholas Caton]

My typical approach for partially exposed floorplates is to select/assign
one of the system types in wizards that will cause generation of per-space
plenums (as opposed to a full floor plenum), which in turn results in
per-plenum roof surfaces (i.e. 1 per space).  Then (post-wizards) straight
up delete each roof surface section that’s “fully sandwiched.”  This
isn’t *perfect
* and you’ll end up with a series of “fully exposed” and “partially
sandwiched” sections, which in the scheme of a large multistory building is
usually in the ballpark of “good enough” for many simulation contexts.
This approach balances early time savings with later flexibility: you can
always come back and tweak those partially sandwiched sections (delete and
remake as a rectangle of appropriate area) if you feel it’s a big deal
later on, though at that point you lose the pretty appearance in 3D.



… although I very much like Keith’s suggestion and will try to remember
that option for the next go-around =)!



That “U-value adjusted for area” approach could also be combined with any
number of other geometry strategies to save time in “later on”
adjustments.



~Nick



*NICK CATON, P.E.*
*Owner*



*Caton Energy Consulting*
  306 N Ferrel

  Olathe, KS  66061

  office:  785.410.3317

www.catonenergy.com



*From:* Equest-users [mailto:equest-users-bounces at lists.onebuilding.org] *On
Behalf Of *Keith Swartz
*Sent:* Tuesday, October 27, 2015 3:38 PM
*To:* John Aulbach; Equest-users
*Subject:* Re: [Equest-users] The old "too much roof" dilimena



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 <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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