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<font face="Calibri">I did some pre-RFP modeling for Denver Housing
Authority to try to help them develop realistic</font> &
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 <i>lbs CO2 emissions/ SF</i> 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.<br>
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.<br>
<br>
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<b><font color="#000000"><small>Aleka Pappas</small></font></b><br>
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<div class="moz-signature"><font face="Calibri"><span
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On 5/16/2011 10:51 AM, Goldwasser, David wrote:
<blockquote
cite="mid:1B3908614A647745B6A63C7E0E2980D029F9B857AB@MAILBOX2.nrel.gov"
type="cite">
<pre wrap="">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
</pre>
<blockquote type="cite">
<pre wrap="">-----Original Message-----
From: <a class="moz-txt-link-abbreviated" href="mailto:bldg-sim-bounces@lists.onebuilding.org">bldg-sim-bounces@lists.onebuilding.org</a> [<a class="moz-txt-link-freetext" href="mailto:bldg-sim">mailto:bldg-sim</a>-
<a class="moz-txt-link-abbreviated" href="mailto:bounces@lists.onebuilding.org">bounces@lists.onebuilding.org</a>] On Behalf Of Marcus Sheffer
Sent: Monday, May 16, 2011 10:16 AM
To: 'Paul Riemer'; <a class="moz-txt-link-abbreviated" href="mailto:bldg-sim@lists.onebuilding.org">bldg-sim@lists.onebuilding.org</a>
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 17365
717-292-2636, <a class="moz-txt-link-abbreviated" href="mailto:sheffer@sevengroup.com">sheffer@sevengroup.com</a>
<a class="moz-txt-link-abbreviated" href="http://www.sevengroup.com">www.sevengroup.com</a>
</pre>
</blockquote>
<pre wrap="">
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