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<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>Of course this gets into the whole debate about the absolute
accuracy of energy modeling. Appendix G makes it clear that it does not predict
actual energy usage, which is what you would be trying to compare to if you use
energy use intensities (ie- kbtu/sf/yr). It is much more difficult and
intensive to set up an energy model intending to show you are better than a
real-world EUI value rather than trying to be X% better than ASHRAE baseline. <o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>At this point, given the pressure to make energy modeling more
affordable (not to spend many extra hours trying to nail down absolutes), it
seems reasonable to me to use the percent better methodology. <o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>Of course we all look forward to the day when we have cheap,
easy to use tools that can actually predict total building energy consumption,
but I’m not holding my breath. <o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
<div>
<p class=MsoNormal><span style='font-family:"Franklin Gothic Demi","sans-serif";
color:#1F497D'>Nathan Miller</span><span style='color:#1F497D'><o:p></o:p></span></p>
<p class=MsoNormal><i><span style='font-size:10.0pt;color:#1F497D'>Senior
Energy Engineer/Mechanical Engineer<o:p></o:p></span></i></p>
<p class=MsoNormal><span style='font-size:10.0pt;color:#1F497D'>direct:
206.788.4577<o:p></o:p></span></p>
</div>
<p class=MsoNormal><span style='font-size:10.0pt;color:#1F497D'>fax:
206.285.7111 </span><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p></o:p></span></p>
<div>
<div style='border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0in 0in 0in'>
<p class=MsoNormal><b><span style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'>From:</span></b><span
style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'> bldg-sim-bounces@lists.onebuilding.org
[mailto:bldg-sim-bounces@lists.onebuilding.org] <b>On Behalf Of </b>Andy hoover<br>
<b>Sent:</b> Wednesday, March 04, 2009 12:20 PM<br>
<b>To:</b> 'Varkie C Thomas'<br>
<b>Cc:</b> bldg-sim@lists.onebuilding.org<br>
<b>Subject:</b> Re: [Bldg-sim] Percent Energy Savings<o:p></o:p></span></p>
</div>
</div>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif";
color:navy'>The highlighted yellow and that entire paragraph nail it for
me. It results in showing/taking the most effective steps to decrease
energy usage which should be the objective, regardless of percentage.
Percent savings is always very very subject to manipulation.<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif";
color:navy'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif";
color:navy'>Andy <o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif";
color:navy'><o:p> </o:p></span></p>
<div>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif";
color:navy'>Andy Hoover</span><span style='color:navy'><o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif";
color:navy'>Principal<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif";
color:navy'>The BEST Consultant, Inc.<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif";
color:navy'>Office: 678-200-7648<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif";
color:navy'>Fax:678-827-0574<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif";
color:navy'>Cell: 678-793-1159<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif";
color:navy'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='color:navy'><a
href="http://www.thebestconsultant.com">www.thebestconsultant.com</a><o:p></o:p></span></p>
<p class=MsoNormal><span style='color:navy'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='color:navy'><o:p> </o:p></span></p>
<div class=MsoNormal align=center style='text-align:center'><span
style='font-size:10.0pt;color:navy'>
<hr size=3 width="100%" align=center>
</span></div>
<p><span style='font-size:7.5pt;font-family:"Arial","sans-serif";color:gray'>This
message may contain confidential and/or privileged information. If you are not
the addressee or authorized to receive this information for the addressee, you
must not use, copy, disclose, or take any action based on this message or
information herein. If you have received this message in error, please advise
the sender immediately by reply e-mail and delete this message. Thank you for
your cooperation.</span><span style='font-size:10.0pt'><o:p></o:p></span></p>
</div>
<div>
<div class=MsoNormal align=center style='text-align:center'>
<hr size=3 width="100%" align=center>
</div>
<p class=MsoNormal><b><span style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'>From:</span></b><span
style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'>
bldg-sim-bounces@lists.onebuilding.org [mailto:bldg-sim-bounces@lists.onebuilding.org]
<b>On Behalf Of </b>Varkie C Thomas<br>
<b>Sent:</b> Wednesday, March 04, 2009 11:04 AM<br>
<b>To:</b> Varkie C Thomas<br>
<b>Cc:</b> bldg-sim@lists.onebuilding.org<br>
<b>Subject:</b> Re: [Bldg-sim] Percent Energy Savings</span><o:p></o:p></p>
</div>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal style='margin-bottom:12.0pt'>I received a few responses to
this message from outside the USA sent directly to me. Below is the
message again with some additional points in red. The sections
highlighted in yellow is from one of the responses<o:p></o:p></p>
<table class=MsoNormalTable border=0 cellspacing=3 cellpadding=0 width="100%"
style='width:100.0%'>
<tr>
<td style='padding:.75pt .75pt .75pt .75pt'>
<div class=MsoNormal align=center style='text-align:center'>
<hr size=2 width="100%" align=center>
</div>
<p class=MsoNormal><b><span style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'>From:</span></b><span
style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'>
bldg-sim-bounces@lists.onebuilding.org
[mailto:bldg-sim-bounces@lists.onebuilding.org] <b>On Behalf Of </b>Varkie C
Thomas<br>
<b>Sent:</b> 2009-03-03 18:26<br>
<b>To:</b> bldg-sim@lists.onebuilding.org<br>
<b>Subject:</b> [Bldg-sim] Percent Energy Savings</span><o:p></o:p></p>
<p class=MsoNormal> <o:p></o:p></p>
<p class=MsoPlainText style='margin:0in;margin-bottom:.0001pt'><span
style='font-family:"Calibri","sans-serif"'>ASHRAE Std90 for the baseline is
already stringent and specifies the commonly used systems & plants based
on building type and size. Based on the CCGT building, high percentage
energy savings for LEED certification can be achieved with low-rise buildings
with a high exposure to floor surface areas to locate PV panels, high but
efficient glass to wall area for day-lighting, the use of GSHP (which
requires a large site area which may not be available in city blocks), and
low common energy consuming systems in baseline and proposed which increases
“percentage” energy savings. </span><o:p></o:p></p>
<p class=MsoPlainText style='margin:0in;margin-bottom:.0001pt'><span
style='font-family:"Calibri","sans-serif"'> </span><o:p></o:p></p>
<p class=MsoPlainText style='margin:0in;margin-bottom:.0001pt'><span
style='font-family:"Calibri","sans-serif"'>A school building is low-rise, is
low in process loads (increases % savings) and is high in occupancy ventilation
which allows for air-to-air heat recovery. It operates only during the day
increasing the impact of day-lighting. It is closed in summer, reducing the
annual cooling load and increases the impact of solar heating during the rest
of the year in cold climates. So it is possible to achieve zero energy
usage. </span><o:p></o:p></p>
<p class=MsoPlainText style='margin:0in;margin-bottom:.0001pt'><span
style='font-family:"Calibri","sans-serif"'> </span><o:p></o:p></p>
<p class=MsoPlainText style='margin:0in;margin-bottom:.0001pt'><span
style='font-family:"Calibri","sans-serif"'>The choices are limited in the
case of inner city high-rise buildings. Today’s high-rise office
building design tries to maximize the glass percentage which increases the
impact of day-lighting. The glass could have PV properties with a very
small overall efficiency of converting light to 110V electricity. The
ASHRAE Std90 baseline for Systems and Plants for such a building is
considered normal design. UFAD and other options are not typical.
The proposed envelope has to offset the 40% Window-Wall-Ratio specified by
ASHRAE. <span style='color:#C00000'>If the office building envelope is
used for a hospital or hotel, which operate 8760 hours/year, then the percent
energy savings will go down.</span> <o:p></o:p></span></p>
<p class=MsoPlainText style='margin:0in;margin-bottom:.0001pt'><span
style='font-family:"Calibri","sans-serif"'><o:p> </o:p></span></p>
<p class=MsoPlainText style='margin:0in;margin-bottom:.0001pt'><span
style='font-family:"Calibri","sans-serif";background:yellow'>High percent
energy savings does not therefore necessarily mean a better or optimized
designed building</span><span style='font-family:"Calibri","sans-serif"'> in
terms of the client’s interests. <span style='background:yellow'>Percent
energy savings should therefore not be the criteria for energy efficient
building design. It should be based on Energy Conservation Measures
(ECM) used for the given building that are more energy efficient compared to
ASHRAE Std90 for the given building type and size which usually results in
increased first costs.</span> The ECMs are going to be different for
different types of buildings in different locations. If the ECM used is
inappropriate, then the client pays a price for the high percent energy
savings.</span><o:p></o:p></p>
</td>
</tr>
</table>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal><span style='color:#C00000'>In my opinion the way to express
energy efficiency would be energy per unit area. Occupancy per unit area
has to be defined for different types of buildings (office, hotel, retail,
hospital, etc.) and energy efficiency should also take into account location
based on HDD & CDD. Energy per Person will account for overall energy
efficiency of buildings & transportation when designing sustainable
townships.<o:p></o:p></span></p>
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