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<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>Taking this discussion back to energy simulation and its impact
on design. Over-sizing systematically occurs but from an energy
perspective it is not always bad. One of our jobs as energy modelers is
to identify the impacts of over-sizing and to drive the design to maximum
annual efficiency. So if the designer is going to oversize the
pump, we need to try and quantify the savings potential of including a VFD for
balancing instead of using throttling valves. If the designer is going to
oversize the boiler, we need to justify to the owner the incremental costs for purchasing
the most efficient boiler setup, which could be a boiler with a high turndown
ratio and oxygen trim controls or multiple smaller boilers.<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'>Also, we may want equipment/systems to be oversized in some
situations. Our job as modelers is to quantify the energy impacts of
design decisions, which may include over-sizing. And what does over-sizing
always mean? Should pipes be sized for 1, 2 or 3ft loss/100 ft, should
ducts be sized for , .1, .2, or .3 ft loss/100 ft, should air handler coils be
sized for 200 fpm or 400 fpm? <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'>Yes over-sizing costs money to the owner up front, but when
designed, installed, and operated correctly – in some situations over-sizing
can be the most efficient design with the most attractive life cycle cost. <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-size:10.0pt;font-family:"Arial","sans-serif";
color:#1F497D'>Glen R Anderson, PE</span><span style='color:#1F497D'><o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif";
color:#1F497D'>(801) 278-1927</span><span style='color:#1F497D'><o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif";
color:#1F497D'>Cell (801) 244-7654</span><span style='color:#1F497D'><o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif";
color:#1F497D'>1997 S 1100 E Suite 201</span><span style='color:#1F497D'><o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif";
color:#1F497D'>Salt Lake City, UT 84106<o:p></o:p></span></p>
<p class=MsoNormal><span style='color:#1F497D'><img width=280 height=68
id="Picture_x0020_1" src="cid:image003.jpg@01CAFCB0.E55EF650"
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<p class=MsoNormal><span style='color:#1F497D'> </span><span
style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p></o:p></span></p>
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<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>Acker, Brad<br>
<b>Sent:</b> Tuesday, May 25, 2010 2:26 PM<br>
<b>To:</b> eQUEST Users List; bldg-sim@lists.onebuilding.org<br>
<b>Subject:</b> Re: [Bldg-sim] Right sizing of equipment aka sleeping giant<o:p></o:p></span></p>
</div>
</div>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal><span style='font-family:"Cambria","serif";color:black'>I
think this is a wonderful time to be in the HVAC industry. New tools are
changing the outdated, over simplified tools and methods used in the past (and
present). I would like to make one comment on the below message. The sentence
“Building occupants are intolerant of too hot and too cold.”
This is one good example of the changing attitudes in the building
industry. Resent research suggest that this sentence should really read “
Building occupants <i>with no control over their environment</i> are intolerant
to too hot or too cold”. When occupants know they can control their
environment (maybe with a window) they will dress accordingly and expand their
comfort zone. <o:p></o:p></span></p>
<p class=MsoNormal><span style='font-family:"Cambria","serif";color:black'>On a
“right sizing” note, I do believe if owners would like to get
aggressive and truly right size equipment they will also need to shoulder the
possible risks, i.e. 10 or 20 hours out of the year you may not be able to
keep your cooling set point. Its energy modeling that will quantity these
risks and size these systems, not a side ruler and a design day (hour).<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-family:"Cambria","serif";color:black'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-family:"Cambria","serif";color:black'>This
exchange has been a nice change of pace from locating weather files. It’s
very interesting to learn other current points of view in our industry,<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-family:"Cambria","serif";color:black'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-family:"Cambria","serif";color:black'>Best
Regards,<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:10.0pt;font-family:"Arial","sans-serif";
color:black'>Brad Acker, P.E.<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 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>Carol
Gardner<br>
<b>Sent:</b> Monday, May 24, 2010 12:07 PM<br>
<b>To:</b> eQUEST Users List; bldg-sim@lists.onebuilding.org<br>
<b>Subject:</b> [Bldg-sim] Right sizing of equipment aka sleeping giant<o:p></o:p></span></p>
</div>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal>All,<br>
<br>
Should always be the goal but it is soooo hard to define. I have worked on tiny
commercial buildings as well as huge commercial buildings. All types. Right
sizing is always my goal and as far as I know is always the goal of the ME's.
It was mine when I did HVAC design work. Building occupants are intolerant of
too hot and too cold. And, in a building of any size with more than one person
in it you will find disagreement about whether it is too hot or too cold at
least some of the time. So what do you do? Especially if you are just the
hapless, overworked, under paid energy modeler? You can see my project list if
you want to. If you listen closely you will hear whatever opinion you want to
hear about me and my work. Thank god for VFDs, VRVs and EC motors, eh?<br
clear=all>
<br>
-- <br>
Carol Gardner PE<o:p></o:p></p>
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