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<p class=MsoNormal><span style='font-family:"Calibri","sans-serif"'>Many thanks
for your help.<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-family:"Calibri","sans-serif"'>I just sent
my request to York . But I hope if anyone have those curves fit to send it to
me for time saving. The chiller that I have is air cooled screw “variable
speed”, and the full load capacity is 340 Ton</span><span
style='font-family:"Eurostile","sans-serif";color:blue'> .<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-family:"Eurostile","sans-serif";
color:blue'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-family:"Eurostile","sans-serif";
color:blue'> </span><span style='font-family:"Calibri","sans-serif"'><o:p></o:p></span></p>
<p class=MsoNormal><span style='font-family:"Eurostile","sans-serif";
color:blue'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-family:"Calibri","sans-serif"'>Mohammad
Al-Masri<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-family:"Calibri","sans-serif"'>Simulation
Engineer <o:p></o:p></span></p>
<p class=MsoNormal><span style='font-family:"Calibri","sans-serif"'>LEED AP
BD+C, CAPM<o:p></o:p></span></p>
<div>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:blue'><o:p> </o:p></span></p>
</div>
<p class=MsoNormal><span style='font-family:"Eurostile","sans-serif";
color:blue'><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";
color:windowtext'>From:</span></b><span style='font-size:10.0pt;font-family:
"Tahoma","sans-serif";color:windowtext'> Brian Fountain
[mailto:bfountain@greensim.com] <br>
<b>Sent:</b> Wednesday, August 18, 2010 8:46 PM<br>
<b>To:</b> equest-users@lists.onebuilding.org; malmasri@ems-int.com<br>
<b>Subject:</b> [!! SPAM] Re: [Equest-users] Modeling Variable Speed Air Cooled
Screw Chillers<o:p></o:p></span></p>
</div>
</div>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal>On the energy design resources website (<a
href="http://www.energydesignresources.com">www.energydesignresources.com</a>)
there is a design guideline called "HVAC Simulation Guidelines" which
includes a section on "energy efficient chillers" and has a procedure
for developing custom chiller curves for DOE-2 -- including a table to send to
the manufacturer to get the required information.<br>
<br>
There is also the CoolTools spreadsheet tool which also generates the DOE-2
curve coefficients -- but I haven't played with it much so will let others
comment on its use/applicability to screw compressors.<br>
<br>
On 8/18/2010 1:26 PM, Mohammad Almasri wrote: <o:p></o:p></p>
<div>
<p class=MsoNormal>Dear Paul, <o:p></o:p></p>
<div>
<p class=MsoNormal>how I can get those data points to build the EIR-fPLR&DT
curve? is it available in the manuals and chillers data sheets? or
I should ask it from the suppliers directly?<o:p></o:p></p>
</div>
<div>
<p class=MsoNormal><o:p> </o:p></p>
</div>
<div>
<p class=MsoNormal>Please advice,<o:p></o:p></p>
</div>
<div>
<p class=MsoNormal><o:p> </o:p></p>
</div>
<div>
<p class=MsoNormal>Mohammad Al-Masri<o:p></o:p></p>
</div>
<div>
<p class=MsoNormal>Simulation Engineer<o:p></o:p></p>
</div>
<div>
<p class=MsoNormal>LEED AP BD+C, CAPM<o:p></o:p></p>
</div>
<div>
<p class=MsoNormal><o:p> </o:p></p>
</div>
<div>
<div>
<p class=MsoNormal>On Tue, Aug 17, 2010 at 4:45 PM, Paul Riemer <<a
href="mailto:Paul.Riemer@dunhameng.com">Paul.Riemer@dunhameng.com</a>>
wrote:<o:p></o:p></p>
<div>
<div>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span
style='font-size:11.0pt;color:#1F497D'>If you ask a manufacturer's rep how a
chiller unloads at part load, the answer might be "good". So I
suggest you specifically request part load points at 10% intervals with and
without AHRI condenser relief. That should enable you to make or confirm
both the EIR-fPLR&DBT and the EIR-fCHWT&DBT curves. </span><o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span
style='font-size:11.0pt;color:#1F497D'> </span><o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span
style='font-size:11.0pt;color:#1F497D'>If you want to go even deeper, you could
ask for those part load points at different chilled water supply temperatures
and then make or confirm a Cap-fCHWT&DBT curve. That seems like
overachieving to me, but my chilled water supply temperatures rarely deviate
very far from AHRI standard conditions.</span><o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span
style='font-size:11.0pt;color:#1F497D'> </span><o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span
style='font-size:11.0pt;color:#1F497D'>Good luck,</span><o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span
style='font-size:11.0pt;color:#1F497D'> </span><o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><b><span
style='font-size:10.0pt;color:#5F574F'>Paul Riemer, PE, LEED AP</span></b><span
style='font-size:11.0pt;color:#1F497D'> </span><o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span
style='font-size:10.0pt;color:#5F574F'>Associate / Mechanical</span><o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span
style='font-size:10.0pt;color:#5F574F'>Direct: 612-465-7696</span><o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span
style='font-size:10.0pt;color:#5F574F'> </span><o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><b>DUNHAM</b><span
style='font-size:10.0pt;color:#5F574F'><br>
Celebrating 50 Years of Service</span><o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span
style='font-size:11.0pt;color:#1F497D'> </span><o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span
style='font-size:11.0pt;color:#1F497D'> </span><o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span
style='font-size:11.0pt;color:#1F497D'> </span><o:p></o:p></p>
<div style='border:none;border-top:solid windowtext 1.0pt;padding:3.0pt 0in 0in 0in;
border-color:-moz-use-text-color
-moz-use-text-color'>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;
margin-left:.5in'><b><span style='font-size:10.0pt'>From:</span></b><span
style='font-size:10.0pt'> <a
href="mailto:equest-users-bounces@lists.onebuilding.org" target="_blank">equest-users-bounces@lists.onebuilding.org</a>
[mailto:<a href="mailto:equest-users-bounces@lists.onebuilding.org"
target="_blank">equest-users-bounces@lists.onebuilding.org</a>] <b>On Behalf Of
</b>Carol Gardner<br>
<b>Sent:</b> Tuesday, August 17, 2010 9:22 AM<br>
<b>To:</b> Mohammad Almasri<br>
<b>Cc:</b> <a href="mailto:eQUEST-users@onebuilding.org" target="_blank">eQUEST-users@onebuilding.org</a><br>
<b>Subject:</b> Re: [Equest-users] Modeling Variable Speed Air Cooled Screw
Chillers</span><o:p></o:p></p>
</div>
<div>
<div>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;
margin-left:.5in'> <o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;margin-bottom:12.0pt;
margin-left:.5in'>Mohammad,<br>
<br>
You will need to ask the manufacturer for information on how the chiller
unloads at part load so you can create an EIR-FPLR curve of your own. That
shouldn't be too hard. It looks like there's no problem with having the water
from the chillers flow using variable speed pumps so that part's there if you
want it. Let me know if you need help creating a curve.<br>
<br>
Carol<o:p></o:p></p>
<div>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;
margin-left:.5in'>On Tue, Aug 17, 2010 at 1:54 AM, Mohammad Almasri <<a
href="mailto:malmasri@ems-int.com" target="_blank">malmasri@ems-int.com</a>>
wrote:<o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;
margin-left:.5in'>Hi all,<br>
<br>
How we can model a Variable Speed "Air Cooled" Screw Chillers in
eQUEST? The<br>
available variable speed chillers curves in eQUEST are only for the<br>
centrifugal .<br>
<br>
Thanks,<br>
<br>
Mohammad Al-Masri<br>
Simulation Engineer<br>
LEED AP BD+C, CAPM<br>
<br>
<br>
<br>
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</div>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;
margin-left:.5in'><br>
<br clear=all>
<br>
-- <br>
Carol Gardner PE<o:p></o:p></p>
</div>
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<p class=MsoNormal><o:p> </o:p></p>
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<pre>-- <o:p></o:p></pre><pre>Brian Fountain, Principal<o:p></o:p></pre><pre>GreenSim<o:p></o:p></pre><pre><o:p> </o:p></pre><pre>voice - 519-489-0112<o:p></o:p></pre><pre>email - <a
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