[Bldg-sim] New Rules of Thumb for Design Loads

Doug Hittle hittle.doug at gmail.com
Tue Oct 29 16:39:03 PDT 2013


On Tue, Oct 29, 2013 at 7:06 AM, Christian Kaltreider
<ckaltreider at sudassociates.com> wrote:
> Hello Group,
>
> Does anyone know of any articles/papers/publications which address peak
> design loads for buildings as energy codes evolve?  I am looking for basic
> rules of thumb for sf/ton (cooling) and btuh/sf (heating).  People use these
> rules of thumb all the time for initial assessments, sanity checks on
> simulation results, etc, but I'm not sure that the rules of thumb are being
> updated as energy codes become more aggressive.  For example, the engineers
> I have been around since I entered the engineering world (granted, that was
> only a few years ago) seem to always go back to 400 sf/ton as a standard
> value, then adjust up or down depending on building characteristics.  I
> haven't seen this  number change as buildings improve, or as I move to
> different climate zones.  To be clear, I am interested in design loads, not
> annual energy usage.
>
> (Note:  Before anyone lambasts me for even bringing up rules of thumb for
> design, I'll go ahead and say that I know they are gross estimations at
> best, and should be used with extreme caution and judgment.  Nonetheless, I
> see them used all the time, so I might as well get as good numbers as I can.
> And a project I am on right now actually requires it (by owner) in
> preliminary design.)
>
> Thanks for your help,
> Christian
>
>
> Christian Kaltreider, LEED AP | Energy Analyst
> Sud Associates, P.A. | T 828.255.4691 | F 828.255.4949 |
> www.sudassociates.com
>
>
>
>
>
>
>
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