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

[Dru.Crawley at bentley.com]

Don't the DOE reference buildings sort of fit that bill?   16 building types/16 climate zone?

I looked at the results for small office for Baltimore and was able to calculate 650 ft2/ton for cooling.... and I see enough data to do similar for heating, peak demand, etc.

http://www1.eere.energy.gov/buildings/commercial/ref_buildings.html


-----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 9:21 AM
To: 'Jim Dirkes'; bldg-sim at lists.onebuilding.org
Subject: Re: [Bldg-sim] New Rules of Thumb for Design Loads

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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