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<p class=MsoNormal>Hi Shalini,<o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal>The effects of part load are taking into account in the
performance curves. There are part load curves for cooling and heating EIR/HIR
under the Unitary Power tab, and for Capacity under the Capacity Curves tab. On
the water side you can also define curves under the Performance Curves tab. Take
a look at this topic in the DOE2 help in eQUEST: “CURVE-FIT for Equipment
performance.” <o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal>I do not know too much about this topic but I understand
that it’s something that in the past has not been handled too well in DOE2. I’m
not sure what type of systems you are modeling but there is a paper by Henderson,
Parker, & Huang that presents alternative EIR plr curves over the DOE2
default for light commercial and residential systems. You should be able to
find the paper online: “Improving DOE-2’s RESYS routine: User Defined Functions
to Provide More Accurate Part Load Energy Use and Humidity Predictions.” I’ve
used these curves for a “typical AC” in the past .<o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal>Hope this helps some. I’d love to hear others input on this
matter.<o:p></o:p></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
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<p class=MsoNormal><i><span style='font-size:11.0pt;color:#1F497D'>____________<o:p></o:p></span></i></p>
<p class=MsoNormal><b><i><span style='font-size:11.0pt;color:#1F497D'>Alea
German<o:p></o:p></span></i></b></p>
<p class=MsoNormal><span style='font-size:10.0pt;color:#1F497D'>Staff Engineer<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;color:#1F497D'>Davis Energy
Group<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;color:#1F497D'><a
href="mailto:agerman@davisenergy.com">agerman@davisenergy.com</a><o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;color:#1F497D'>ph:
530-753-1100 x30<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;color:#1F497D'>123 C Street<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;color:#1F497D'>Davis, CA 95616<o:p></o:p></span></p>
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<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
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<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"'>
equest-users-bounces@lists.onebuilding.org
[mailto:equest-users-bounces@lists.onebuilding.org] <b>On Behalf Of </b>Shalini
Modi<br>
<b>Sent:</b> Friday, March 25, 2011 10:33 PM<br>
<b>To:</b> eQUEST Mail list<br>
<b>Subject:</b> [Equest-users] HVAC part load efficiencies<o:p></o:p></span></p>
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<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'>Hello
all,<br>
<br>
Your answer to the following question will be greatly appreciated - <br>
<br>
<br>
When we mention equipment efficiencies (by manufacturers or the default
values), they are usually for full load. <b>Does eQUEST consider the part load
efficiencies of HVAC equipments?</b><br>
<br>
Under Air side HVAC - Cooling - Coil Capacity/Control, I did see 'Min cycling
part load ratio' and I think the default their is 0.8. Is this relevant? How
about other equipments?<br>
<br>
<br>
Many thanks and kind regards,<br>
<br>
Shalini<o:p></o:p></span></p>
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