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<p class=MsoNormal><span style='color:#1F497D'>Hi everyone!<o:p></o:p></span></p>
<p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='color:#1F497D'>I think I have <u>finally</u>
wrapped my mind completely around custom chiller performance curves for a
centrifugal VSD chiller. I’ve got a few specific questions now that I’m
on the other side of the fence:<o:p></o:p></span></p>
<p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoListParagraph style='text-indent:-.25in;mso-list:l1 level1 lfo3'><![if !supportLists]><span
style='color:#1F497D'><span style='mso-list:Ignore'>1.<span style='font:7.0pt "Times New Roman"'>
</span></span></span><![endif]><span style='color:#1F497D'>Is it necessary for
the data points of a part load efficiency curve (EIR-FPLR&dT in my case) to
originate from data with a 1.0 (100%) PLR ratio corresponding to a maximum vs.
a design load capacity? From what I gather in </span><span
style='color:#1F497D'><a
href="http://www.energydesignresources.com/Portals/0/documents/DesignGuidelines/EDR_DesignGuidelines_%20HVAC_Simulation.pdf">the
EDR reference</a></span><span style='color:#1F497D'> (re: “Method 2” on PDF
page 32/65), this curve can be generated using part-load readings assuming a <u>design</u>
capacity at the 100% loading mark… but the DOE2 help entry for “EIR-FPLR” seems
to suggest otherwise (copied below – see highlighted line).<o:p></o:p></span></p>
<p class=MsoListParagraph style='text-indent:-.25in;mso-list:l1 level1 lfo3'><![if !supportLists]><span
style='color:#1F497D'><span style='mso-list:Ignore'>2.<span style='font:7.0pt "Times New Roman"'>
</span></span></span><![endif]><span style='color:#1F497D'>If the above part
load efficiency curve is created based on data where the 100% loading point
corresponds to the maximum (not design) capacity, should “DESIGN-PLR” (the
ratio of design to maximum capacity) be set to 1.00 and the capacity of the
chiller be specified at its maximum (not design) for the design/rated
conditions? As I write this question it sounds like I’m chasing my tail –
someone straighten me out =)!<o:p></o:p></span></p>
<p class=MsoListParagraph style='text-indent:-.25in;mso-list:l1 level1 lfo3'><![if !supportLists]><span
style='color:#1F497D'><span style='mso-list:Ignore'>3.<span style='font:7.0pt "Times New Roman"'>
</span></span></span><![endif]><span style='color:#1F497D'>When you veterans
finish a project with sets of custom performance curves, do you have any
suggestions for a naming scheme for future reference/re-use? I’m
currently thinking to keep the curves grouped in an .inp snippet I for
importing along with an equipment cutsheet… but I’m certain I’ll forget the all
the details as quickly as humanly possible when this project is behind me…<o:p></o:p></span></p>
<p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal style='margin-left:.25in'><span style='color:#1F497D'> ~Nick<o:p></o:p></span></p>
<p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p>
<div>
<p class=MsoNormal><span style='color:#1F497D'><img border=0 width=119
height=37 id="Picture_x0020_1" src="cid:image001.jpg@01CB7AB2.6C1ABC90"
alt="cid:489575314@22072009-0ABB"></span><b><span style='font-family:"Stylus BT","sans-serif";
color:#2D4D5E'><o:p></o:p></span></b></p>
<p class=MsoNormal><b><span style='font-family:"Stylus BT","sans-serif";
color:#2D4D5E'><o:p> </o:p></span></b></p>
<p class=MsoNormal><b><span style='font-family:"Stylus BT","sans-serif";
color:#2D4D5E'>NICK CATON, E.I.T.</span></b><b><span style='font-size:12.0pt;
font-family:"Stylus BT","sans-serif";color:#2D4D5E'><o:p></o:p></span></b></p>
<p class=MsoNormal><span style='font-size:7.5pt;color:#CC9900'>PROJECT ENGINEER</span><span
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<p class=MsoNormal><span style='font-size:10.0pt;color:#2D4D5E'>fax 913
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<p class=MsoNormal><i><span style='font-size:10.0pt;color:#2D4D5E'>Check out
our new web-site @ </span></i><span style='color:#1F497D'><a
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</div>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><b><span
style='font-size:10.0pt;font-family:"Times New Roman","serif"'>EIR-FPLR<o:p></o:p></span></b></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span
style='font-size:12.0pt;font-family:"Times New Roman","serif"'>Takes the U-name
of a curve that adjusts the electric input ratio as a function of<o:p></o:p></span></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;
margin-left:.5in'><span style='font-size:12.0pt;font-family:Symbol'>· </span><u><span
style='font-size:12.0pt;font-family:"Times New Roman","serif"'>The part load
ratio (PLR)</span></u><span style='font-size:12.0pt;font-family:"Times New Roman","serif"'>
– The PLR is defined as the ratio of the hourly load to the hourly
capacity; Load / Cap<sub>hour</sub><o:p></o:p></span></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;
margin-left:.5in'><span style='font-size:12.0pt;font-family:Symbol'>· </span><u><span
style='font-size:12.0pt;font-family:"Times New Roman","serif"'>The
evaporator/condenser dT</span></u><span style='font-size:12.0pt;font-family:
"Times New Roman","serif"'> - The temperature differential between the
condenser and leaving chilled-water. The meaning of the condenser
temperature varies according to condenser type. <o:p></o:p></span></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;
margin-left:2.7pt'><span style='font-size:12.0pt;font-family:"Times New Roman","serif"'>For
most chillers, the dT has a relatively small effect on part-load performance. However,
for variable-speed centrifugal chillers, the effect of dT is as important as
the PLR. This is because the pressure rise across the impeller is
proportional to the square of the impeller’s speed. Unless some form on
condenser temperature relief is employed to reduce the temperature (and
pressure) differential across the chiller at part load, the performance of a
variable-speed chiller may not be significantly different than that of a
constant-speed chiller.<o:p></o:p></span></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span
style='font-size:12.0pt;font-family:"Times New Roman","serif"'>To model power
consumption as a function of the PLR only, use a CURVE-FIT of TYPE = QUADRATIC
or CUBIC. To model as a function of both PLR and dT, use a
BI-QUADRATIC-RATIO&DT curve. The curve must be normalized to 1.0 at full
load and the rated temperature differential. <o:p></o:p></span></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><b><span
style='font-size:12.0pt;font-family:"Times New Roman","serif";color:red'>Note that,
for centrifugal chillers, ‘full load’ is defined as the ‘maximum capacity’, not
the ‘design capacity’.</span></b><span style='font-size:12.0pt;font-family:
"Times New Roman","serif"'> Refer to the DESIGN-PLR keyword for more
information.<o:p></o:p></span></p>
<p style='margin-bottom:12.0pt'><o:p> </o:p></p>
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