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

[David Eldridge]

You could use the DOE reference buildings, although these are not "designed" buildings, they only exist in model space...so as a designer I wouldn't use the peak loads necessarily, but maybe the ratio of peak load would be interesting across the code versions.

DSE Mobile

> On Oct 29, 2013, at 8:21 AM, "Christian Kaltreider" <ckaltreider at sudassociates.com> wrote:
> 
> Jim,
> 
> Thanks.  Yes, I can do my own little study, and I can also just look back at
> results from past projects.  That's a good suggestion.  But I was hoping to
> have something credible to reference (outside my own firm) for the owner.  I
> have seen DOE/National Lab comparisons of annual energy usage between the
> different versions of 90.1...I was hoping there might be something similar
> for design loads.
> 
> Thanks,
> Christian
> 
> Christian Kaltreider, LEED AP | Energy Analyst
> Sud Associates, P.A. | T 828.255.4691 | F 828.255.4949 |
> www.sudassociates.com
> 
> 
> -----Original Message-----
> From: Jim Dirkes [mailto:jim at buildingperformanceteam.com] 
> Sent: Tuesday, October 29, 2013 9:11 AM
> To: Christian Kaltreider; bldg-sim at lists.onebuilding.org
> Subject: RE: [Bldg-sim] New Rules of Thumb for Design Loads
> 
> Dear Christian,
> I do not know of any such resources!  
> What do you think about creating a "typical" building and trying out various
> envelope, lighting, plug load and HVAC options in your climate to see the
> impact of each? That should not be too daunting a task.
> 
> James V Dirkes II, PE, BEMP, LEED AP
> www.buildingperformanceteam.com 
> Energy Analysis, Commissioning & Training Services
> 1631 Acacia Drive, Grand Rapids, MI 49504 USA
> 616 450 8653
> 
> 
> -----Original Message-----
> From: bldg-sim-bounces at lists.onebuilding.org
> [mailto:bldg-sim-bounces at lists.onebuilding.org] On Behalf Of Christian
> Kaltreider
> Sent: Tuesday, October 29, 2013 9:06 AM
> To: bldg-sim at lists.onebuilding.org
> Subject: [Bldg-sim] New Rules of Thumb for Design Loads
> 
> 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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