[Bldg-sim] Energy Model Cost - best designdoesn'tequalmost LEED points

Carol Gardner cmg750 at gmail.com
Mon May 16 11:30:07 PDT 2011


It's interesting that just as we are having this discussion, the budget for
CBECS is going away:
http://blog.bepinfo.com/2011/05/death-knell-for-energy-star-building.html.
So even one less source of EUI information for people to use. Ironic!

On Mon, May 16, 2011 at 10:33 AM, Aleka Pappas <apappas at group14eng.com>wrote:

>  I did some pre-RFP modeling for Denver Housing Authority to try to help
> them develop realistic & useful energy metric design goals for a recent
> project.  We ended up setting a percent energy cost saving goal (ie LEED)
> along with a site *lbs CO2 emissions/ SF* goal for the design.  We started
> out with a kBtu/ SF metric, but weren't happy with the way this quantified
> environmental impact in Colorado.  This is because most of our electricity
> comes from coal and it's CO2 intensive relative to natural gas, but looks
> better than natural gas when looking at site kBtu/ SF.  It's interesting how
> this will change design decisions compared to just looking at energy cost
> savings relative to the ASHRAE 90.1 baseline; it's much easier to hit 50%
> savings with an all electric building, but CO2 emissions go up.
> The metrics DHA ended up included in their RFP came out of modeling the
> actual building type in the actual location of the project, so we were
> comfortable with them being reasonable design goals for the 'as-designed'
> building.  We also made sure that people understood the difference between
> 'as-designed' modeling and 'operational' building energy use.  It was great
> to work with a really progressive client who gets it and wanted to look at
> these details closely.
>
>  *Aleka Pappas*
>      Building Energy Engineer*
>  **
> GROUP14 ENGINEERING, INC. *
>  Inspiring better buildings.
> 1325 E. 16th Ave, Denver, CO 80218
>  Direct: 720.221.1082/ Main: 303.861.2070/Fax: 303.830.2016
> www.group14eng.com
>  <swagner at group14eng.com>
> *Group14 Engineering offers building energy optimization, LEED
> coordination, commissioning, energy audits, LEED EBOM, and greenhouse gas
> analysis.*
>
> On 5/16/2011 10:51 AM, Goldwasser, David wrote:
>
> One variation I was considering to EUI was to look at Kbtu per annual occupant hour vs. Kbtu per area. This came about when I wanted know how to evaluate some operational alternatives such as extending the hours of operation for a facility, or looking at an office running with a rotating staff all working 4x10 hour days a week vs. a smaller static staff in the same building working 5x8 hour days a week. Kbtu/sf2 alone didn't help here, but looking at Kbtu per annual occupant hour did.
>
> Extending operational hours will clearly increase your Kbtu/ft2 (EUI) but the question I wanted to answer is if those extra occupant hours come at a lower energy impact per occupant hour than the baseline case. "Kbtu/ annual occupant hour" addressed this. Is there a similar metric that anyone else is using?
>
> David
>
> --
> David Goldwasser, LEED AP
> National Renewable Energy Laboratory
>
>
>
>
>
>  -----Original Message-----
> From: bldg-sim-bounces at lists.onebuilding.org [mailto:bldg-sim <bldg-sim>-bounces at lists.onebuilding.org] On Behalf Of Marcus Sheffer
> Sent: Monday, May 16, 2011 10:16 AM
> To: 'Paul Riemer'; bldg-sim at lists.onebuilding.org
> Subject: Re: [Bldg-sim] Energy Model Cost - best designdoesn'tequalmost LEED
> points
>
> Paul,
>
> The next version of LEED will approach a more standardized metric (EUI Source
> Energy) but still include cost as a metric as well.  For those who feel
> strongly that only actual energy use should be used for green building
> certification the LEED EBOM methodologies will be allowed into LEED BD+C
> projects.
>
> USGBC is trying hard to lead us to that better way.  If you know the better
> way please share.
>
> Marcus Sheffer
> Energy Opportunities, Inc/a 7group Company
> 1200 E Camping Area Road, Wellsville, PA  17365717-292-2636, sheffer at sevengroup.comwww.sevengroup.com
>
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-- 
Carol Gardner PE
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