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The PG&E CoolTools project developed a spreadsheet tool for
determining chiller coefficients. There is a version of it at the
Taylor Engineering web site. I am not sure it is working correctly,
based on a quick look. There is only one worksheet and it
references other worksheets that I do not see.<br><br>
<a href="http://www.taylor-engineering.com/publications/design_guides.shtml" eudora="autourl">
http://www.taylor-engineering.com/publications/design_guides.shtml</a><br>
<br>
If you are interested in using it and have questions, I suggest you get
in touch with Mark Hydeman at Taylor.<br><br>
Regards,<br><br>
Bill Bahnfleth<br><br>
At 10:49 AM 12/8/2008, Robby Oylear wrote:<br>
<blockquote type=cite class=cite cite="">The short answer would be no and
no. I’m not aware of any curve tools or libraries and in my
experience if you want to use a custom chiller curve you’ll have to build
it yourself, with close work with the manufacturer. To create
custom chiller curves you need to have data for the capacity and
efficiency as a function of condenser water supply and chilled water
supply temperatures as well as the kW power draw as a function of part
load and LIFT conditions (Condenser Water Supply Temp – CHW Supply
Temp).<br>
<br>
This is all in regards to a variable-speed centrifugal water cooled
chiller, I’m not sure how different this would be for an air-cooled
chiller as I haven’t tried to use custom data for one yet.<br>
<br>
I’ve attached a PDF of a sample of the data I had to collect from the
manufacturer in order to create a set of custom chiller curves.
Essentially I had to specify the conditions that I wanted efficiency and
capacity numbers for and then the manufacturer was able to use his
selection program to determine the numbers for me.<br>
<br>
Hope this helps,<br>
<br>
Robby Oylear, LEED® AP<br>
<i>Mechanical Engineer<br>
</i>direct: 206.788.4571<br>
<i>cell: 206.354.2721<br>
</i><u><a href="http://www.rushingco.com/" eudora="autourl">www.</a></u>
<a href="http://www.rushingco.com/" eudora="autourl">rushingco.com</a><br>
<br>
<b>From:</b> equest-users-bounces@lists.onebuilding.org
[<a href="mailto:equest-users-bounces@lists.onebuilding.org" eudora="autourl">
mailto:equest-users-bounces@lists.onebuilding.org</a>] <b>On Behalf Of
</b>Vikram Sami<br>
<b>Sent:</b> Monday, December 08, 2008 7:35 AM<br>
<b>To:</b> equest-users@lists.onebuilding.org<br>
<b>Subject:</b> [Equest-users] Chiller curves<br>
<br><br>
Hi,<br><br>
Is there a chiller curve tool/library out there for specific chillers in
eQUEST? Also – can you create a curve with just the kW/ton and the NPLV?
What are the inputs I need to create a custom chiller curve?<br><br>
<b>Vikram Sami,</b> LEED AP<br>
Direct Phone 404-253-1466 | Direct Fax 404-253-1366 <br><br>
<b>LORD, AECK & SARGENT ARCHITECTURE<br>
</b>1201 Peachtree Street NE, Suite 300, Atlanta, GA 30361<br>
Responsive Design · Technological Expertise · Exceptional Service<br>
Please visit our new website |
<a href="file:///\\www.lordaecksargent.com\">www.lordaecksargent.com</a>
<br><br>
P Think GREEN before you print.<br><br>
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<br>
<div>__________</div>
<br>
<div>William P. Bahnfleth, PhD, PE, FASHRAE</div>
<div>Professor of Architectural Engineering and Director, Indoor
Environment Center</div>
<br>
<div>Penn State / 104 Engineering Unit A / University Park, PA 16802
USA</div>
<div>voice: 814.863.2076 / fax: 814.863.4789 / e-mail:
wbahnfleth@psu.edu</div>
<div>
<a href="http://www.engr.psu.edu/ae/faculty/bahnfleth/" EUDORA=AUTOURL>
http://www.engr.psu.edu/ae/faculty/bahnfleth/</a> ,
<a href="http://www.engr.psu.edu/ae/iec" EUDORA=AUTOURL>
http://www.engr.psu.edu/ae/iec</a></div>
<br>
It is better to know less than to know so much that ain’t so. - Josh
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