Mohammad,<br><br>I will answer you if you don't mind. Tell the manufacturer that you need to know how the chiller unloads based on the outside air temperature (DBT) and the leaving chilled water temperature (CHWT), in other words, the chilled water temperature you are delivering to your systems. You will find when you go into your online help manuals that you need to normalize all your data around the ARI design conditions. That means that your EIRs will look like 1.0, 1.09, .98, etc., depending on whether your part load EIR is higher or lower than the EIR at the ARI design condition. If that is confusing to you still, after doing your diligence and reading the DOE2/eQUEST online help manuals, let us know.<br>
<br>Carol<br><br><div class="gmail_quote">On Wed, Aug 18, 2010 at 10:26 AM, Mohammad Almasri <span dir="ltr"><<a href="mailto:malmasri@ems-int.com">malmasri@ems-int.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin: 0pt 0pt 0pt 0.8ex; border-left: 1px solid rgb(204, 204, 204); padding-left: 1ex;">
<div dir="ltr">Dear Paul,<div>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?</div><div><br></div>
<div>Please advice,</div><div class="im"><div><br></div><div>Mohammad Al-Masri</div><div>Simulation Engineer</div><div>LEED AP BD+C, CAPM</div><div><br></div></div><div><div></div><div class="h5"><div><div class="gmail_quote">
On Tue, Aug 17, 2010 at 4:45 PM, Paul Riemer <span dir="ltr"><<a href="mailto:Paul.Riemer@dunhameng.com" target="_blank">Paul.Riemer@dunhameng.com</a>></span> wrote:<br>
<blockquote class="gmail_quote" style="margin: 0pt 0pt 0pt 0.8ex; border-left: 1px solid rgb(204, 204, 204); padding-left: 1ex;">
<div link="blue" vlink="purple" lang="EN-US">
<div>
<p class="MsoNormal"><span style="font-size: 11pt; color: rgb(31, 73, 125);">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></p>
<p class="MsoNormal"><span style="font-size: 11pt; color: rgb(31, 73, 125);"> </span></p>
<p class="MsoNormal"><span style="font-size: 11pt; color: rgb(31, 73, 125);">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></p>
<p class="MsoNormal"><span style="font-size: 11pt; color: rgb(31, 73, 125);"> </span></p>
<p class="MsoNormal"><span style="font-size: 11pt; color: rgb(31, 73, 125);">Good luck,</span></p>
<p class="MsoNormal"><span style="font-size: 11pt; color: rgb(31, 73, 125);"> </span></p>
<p class="MsoNormal" style=""><b><span style="font-size: 10pt; color: rgb(95, 87, 79);">Paul Riemer, PE, LEED AP</span></b><span style="font-size: 11pt; color: rgb(31, 73, 125);"> </span></p>
<p class="MsoNormal" style=""><span style="font-size: 10pt; color: rgb(95, 87, 79);">Associate / Mechanical</span><span style="font-size: 11pt; color: rgb(31, 73, 125);"></span></p>
<p class="MsoNormal" style=""><span style="font-size: 10pt; color: rgb(95, 87, 79);">Direct: 612-465-7696</span><span style="font-size: 11pt; color: rgb(31, 73, 125);"></span></p>
<p class="MsoNormal" style=""><span style="font-size: 10pt; color: rgb(95, 87, 79);"> </span></p>
<p class="MsoNormal"><b><span style="color: rgb(196, 38, 46);">DUNHAM</span></b><span style="font-size: 10pt; color: rgb(95, 87, 79);"><br>
Celebrating 50 Years of Service</span><span style="font-size: 11pt; color: rgb(95, 87, 79);"></span></p>
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<p class="MsoNormal"><span style="font-size: 11pt; color: rgb(31, 73, 125);"> </span></p>
<p class="MsoNormal"><span style="font-size: 11pt; color: rgb(31, 73, 125);"> </span></p>
<div style="border-width: 1pt medium medium; border-style: solid none none; border-color: rgb(181, 196, 223) -moz-use-text-color -moz-use-text-color; padding: 3pt 0in 0in;">
<p class="MsoNormal" style="margin-left: 0.5in;"><b><span style="font-size: 10pt;">From:</span></b><span style="font-size: 10pt;"> <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></p>
</div><div><div></div><div>
<p class="MsoNormal" style="margin-left: 0.5in;"> </p>
<p class="MsoNormal" style="margin-right: 0in; margin-bottom: 12pt; margin-left: 0.5in;">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</p>
<div>
<p class="MsoNormal" style="margin-left: 0.5in;">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:</p>
<p class="MsoNormal" style="margin-left: 0.5in;">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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<p class="MsoNormal" style="margin-left: 0.5in;"><br>
<br clear="all">
<br>
-- <br>
Carol Gardner PE</p>
</div></div></div>
</div>
</blockquote></div><br></div></div></div></div>
</blockquote></div><br><br clear="all"><br>-- <br>Carol Gardner PE<br>
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