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On the energy design resources website
(<a class="moz-txt-link-abbreviated" 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:
<blockquote
cite="mid:AANLkTin4FsVeag8OOC9kd-FNaxEg_ZF25YKrSuiOuY=g@mail.gmail.com"
type="cite">
<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><br>
</div>
<div>Mohammad Al-Masri</div>
<div>Simulation Engineer</div>
<div>LEED AP BD+C, CAPM</div>
<div><br>
</div>
<div>
<div class="gmail_quote">On Tue, Aug 17, 2010 at 4:45 PM, Paul
Riemer <span dir="ltr"><<a moz-do-not-send="true"
href="mailto:Paul.Riemer@dunhameng.com">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>
<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>
<p class="MsoNormal"><span style="font-size: 11pt;
color: rgb(31, 73, 125);"> </span></p>
<div style="border-right: medium none; 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
moz-do-not-send="true"
href="mailto:equest-users-bounces@lists.onebuilding.org"
target="_blank">equest-users-bounces@lists.onebuilding.org</a>
[mailto:<a moz-do-not-send="true"
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 moz-do-not-send="true"
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 class="h5">
<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 moz-do-not-send="true"
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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</div>
<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>
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<br>
<br>
<pre class="moz-signature" cols="72">--
Brian Fountain, Principal
GreenSim
voice - 519-489-0112
email - <a class="moz-txt-link-abbreviated" href="mailto:bfountain@greensim.com">bfountain@greensim.com</a></pre>
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