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<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>Tim,<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>I have modeled a water-cooled VRF project and I used a Lake/Well
system as the condensing loop. This was a water-cooled VRF project with a geothermal
well field. I took the geothermal loop temperature calculations from a
geothermal sizing program and scheduled the ground loop temperature in eQUEST. <o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>You can create custom performance curves (or use the GSHP/WLHP
curves for quicker but less accurate results) and use a dual speed compressor
(the variable speed compressor did not work for me either) for the VRF system. <o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>Good luck,<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>Otto<o:p></o:p></span></p>
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<div style='border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0in 0in 0in'>
<p class=MsoNormal style='margin:0in;margin-bottom:.0001pt'><b><span
style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'>From:</span></b><span
style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'> Tim Johnson
[mailto:timj@ctagroup.com] <br>
<b>Sent:</b> Tuesday, December 11, 2012 11:12 AM<br>
<b>To:</b> <equest-users@lists.onebuilding.org><br>
<b>Subject:</b> [Equest-users] Water Cooled VRF<o:p></o:p></span></p>
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<p class=MsoNormal><o:p> </o:p></p>
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<p class=MsoNormal style='margin:0in;margin-bottom:.0001pt'><span
style='font-size:10.0pt;font-family:"Segoe UI","sans-serif"'>I am attempting to
model a water cooled VRF system for a dormitory in northern Montana. I
have used Dana Troy's method for air source VRF systems several times with
great success, but this is my first attempt at a water source system. The
model seems to work as expected with a single speed compressor, but when I
change this to a variable speed compressor, the system doesn't function
properly. There is no flow in the water loop and the VRF heating energy
disappears. The model still shows no unmet load hours but is clearly not
operating correctly.<o:p></o:p></span></p>
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<p class=MsoNormal style='margin:0in;margin-bottom:.0001pt'><span
style='font-size:10.0pt;font-family:"Segoe UI","sans-serif"'> <o:p></o:p></span></p>
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<p class=MsoNormal style='margin:0in;margin-bottom:.0001pt'><span
style='font-size:10.0pt;font-family:"Segoe UI","sans-serif"'>I have done some
research in the help files and the forum archives and found little help.
Volume 3 of the DOE2 help file under Air-Side System Types - PVVT seems to hint
at variable speed compressors being only for air cooled condenser types.
The eQUEST forums have a few posts of this same question with no
conclusion. What have you found? What is the best way to simulate a
variable speed compressor for a water source heat pump system? Am I
missing something here?<o:p></o:p></span></p>
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<p class=MsoNormal style='margin:0in;margin-bottom:.0001pt'><span
style='font-size:10.0pt;font-family:"Segoe UI","sans-serif"'> <o:p></o:p></span></p>
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<p class=MsoNormal style='margin:0in;margin-bottom:.0001pt'><span
style='font-size:10.0pt;font-family:"Segoe UI","sans-serif"'>Thanks,<o:p></o:p></span></p>
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<p class=MsoNormal style='margin:0in;margin-bottom:.0001pt'><span
style='font-size:10.0pt;font-family:"Segoe UI","sans-serif"'>Tim<o:p></o:p></span></p>
</div>
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<p class=MsoNormal style='margin:0in;margin-bottom:.0001pt'><span
style='font-size:10.0pt;font-family:"Segoe UI","sans-serif"'> <o:p></o:p></span></p>
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<p class=MsoNormal style='margin:0in;margin-bottom:.0001pt'><span
style='font-size:10.0pt;font-family:"Segoe UI","sans-serif"'> <o:p></o:p></span></p>
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<td valign=top align=left style='padding-top:0in;padding-right:2.25pt;
padding-bottom:0in;padding-left:2.25pt'><pre style='mso-element:frame;
mso-element-frame-hspace:2.25pt;mso-element-wrap:around;mso-element-anchor-vertical:
paragraph;mso-element-anchor-horizontal:column;mso-height-rule:exactly'><strong><span
style='font-family:"Arial","sans-serif";color:maroon'>Tim Johnson, PE, BEMP, LEED AP</span></strong><o:p></o:p></pre><pre
style='mso-element:frame;mso-element-frame-hspace:2.25pt;mso-element-wrap:
around;mso-element-anchor-vertical:paragraph;mso-element-anchor-horizontal:
column;mso-height-rule:exactly'><strong><span style='font-size:7.5pt;
font-family:"Arial","sans-serif";color:maroon'>CTA : Mechanical Engineer</span></strong> <o:p></o:p></pre><pre
style='mso-element:frame;mso-element-frame-hspace:2.25pt;mso-element-wrap:
around;mso-element-anchor-vertical:paragraph;mso-element-anchor-horizontal:
column;mso-height-rule:exactly'><span style='font-size:7.5pt;font-family:
"Arial","sans-serif"'>DIRECT: 208.577.5645</span><span style='font-size:7.5pt'><o:p></o:p></span></pre><pre
style='mso-element:frame;mso-element-frame-hspace:2.25pt;mso-element-wrap:
around;mso-element-anchor-vertical:paragraph;mso-element-anchor-horizontal:
column;mso-height-rule:exactly'><span style='font-size:7.5pt'> <o:p></o:p></span></pre><pre
style='mso-element:frame;mso-element-frame-hspace:2.25pt;mso-element-wrap:
around;mso-element-anchor-vertical:paragraph;mso-element-anchor-horizontal:
column;mso-height-rule:exactly'><strong><span style='font-size:7.5pt;
font-family:"Arial","sans-serif";color:maroon'>CTA, Inc. </span></strong><strong><span
style='font-size:7.5pt;font-family:"Arial","sans-serif";color:#3E3E3E'>| </span></strong><strong><span
style='font-size:7.5pt;font-family:"Arial","sans-serif";color:#8E0000'><a
href="http://www.ctagroup.com/"><span style='color:#8E0000'>www.ctagroup.com</span></a></span></strong><o:p></o:p></pre><pre
style='mso-element:frame;mso-element-frame-hspace:2.25pt;mso-element-wrap:
around;mso-element-anchor-vertical:paragraph;mso-element-anchor-horizontal:
column;mso-height-rule:exactly'><span style='font-size:7.5pt;font-family:
"Arial","sans-serif";color:#3E3E3E'>1185 W. Grove St. – Boise, ID 83702</span><o:p></o:p></pre><pre
style='mso-element:frame;mso-element-frame-hspace:2.25pt;mso-element-wrap:
around;mso-element-anchor-vertical:paragraph;mso-element-anchor-horizontal:
column;mso-height-rule:exactly'><span style='font-size:7.5pt;font-family:
"Arial","sans-serif";color:#3E3E3E'>P: 208.336.4900 – F: 208.343.3531</span><o:p></o:p></pre></td>
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