Following the equations in the EnergySoft VRF Application it is possible to do spreadsheet calculations that match EnergyPro's results very closely. In our experience, at least in applications with limited heat recovery opportunity, the air-cooled PVVT system matches the results of the VRF equations quite closely without any additional calculations. The ECM to apply the Energy Soft VRF equations usually only shows an additional savings of 0.4% total building energy use. <div>
<br></div><div>This all assumes that EnergySoft's equations are correct. I haven't seen any data that shows that these equations have been calibrated to actual VRF energy use.</div><div><br></div><div><p class="MsoNormal">
<a name="_MailAutoSig"><span style="font-family:"Franklin Gothic Demi","sans-serif";color:#632423">Robby Oylear, </span></a><span style="font-size:10.0pt;font-family:"Franklin Gothic Demi","sans-serif";color:#632423">PE, LEED
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<br><div class="gmail_quote">On Thu, Jun 28, 2012 at 7:30 AM, Howe, Timothy <span dir="ltr"><<a href="mailto:Timothy.Howe@stantec.com" target="_blank">Timothy.Howe@stantec.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
<div bgcolor="white" lang="EN-US" link="blue" vlink="purple"><div><p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial","sans-serif"">Just found this doc on VRF applications in the DOE2.1 engine. Haven’t had a chance to dig through it but maybe some interesting information for the list.<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial","sans-serif""><u></u> <u></u></span></p><p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial","sans-serif""><a href="http://www.energysoft.com/ep/VRF%20Application.pdf" target="_blank">http://www.energysoft.com/ep/VRF%20Application.pdf</a><u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial","sans-serif";color:blue"><u></u> <u></u></span></p><p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial","sans-serif";color:blue"><u></u> <u></u></span></p>
<div><div><p class="MsoNormal"><b><span style="font-size:9.0pt;font-family:"Arial","sans-serif"">Timothy Howe, MS, LEED® AP BD+C</span></b><span style="font-size:9.0pt;font-family:"Arial","sans-serif""><br>
Mechanical Engineer<br>Stantec<u></u><u></u></span></p></div><div><p class="MsoNormal"><span style="font-size:9.0pt;font-family:"Arial","sans-serif";color:gray">61 Commercial Street<br>Rochester NY 14614<br>
Ph: <a href="tel:%28585%29%20413-5347" value="+15854135347" target="_blank">(585) 413-5347</a><br>Fx: <a href="tel:%28585%29%20272-1814" value="+15852721814" target="_blank">(585) 272-1814</a><br>Cell: <a href="tel:%28585%29%20330-8681" value="+15853308681" target="_blank">(585) 330-8681</a><u></u><u></u></span></p>
</div><div><p class="MsoNormal"><span style="font-size:13.0pt;font-family:"Arial Narrow","sans-serif";color:blue"><a href="http://www.stantec.com" target="_blank"><b><span style="color:#993333;text-decoration:none">stantec</span></b><span style="color:#003f6e;text-decoration:none">.com</span></a> <u></u><u></u></span></p>
</div><div><p class="MsoNormal"><span style="font-size:9.0pt;font-family:"Arial","sans-serif""> <u></u><u></u></span></p></div><div><p class="MsoNormal"><span style="font-size:9.0pt;font-family:"Arial","sans-serif"">The content of this email is the confidential property of Stantec and should not be copied, modified, retransmitted, or used for any purpose except with Stantec's written authorization. If you are not the intended recipient, please delete all copies and notify us immediately.<u></u><u></u></span></p>
</div><div><p class="MsoNormal"><span style="font-size:9.0pt;font-family:"Arial","sans-serif""><u></u> <u></u></span></p></div></div><p class="MsoNormal"><span style="font-size:13.5pt;font-family:Webdings;color:#008040">ü</span><span style="font-size:12.0pt;font-family:"Times New Roman","serif";color:blue"> </span><span style="font-size:10.0pt;font-family:"Arial Narrow","sans-serif";color:#008040">Please consider the environment before printing this email.</span><span style="font-size:12.0pt;font-family:"Times New Roman","serif";color:blue"> </span><span style="font-size:10.0pt;font-family:"Arial","sans-serif";color:blue"><u></u><u></u></span></p>
<div><div style="border:none;border-top:solid #b5c4df 1.0pt;padding:3.0pt 0in 0in 0in"><p class="MsoNormal"><b><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif";color:windowtext">From:</span></b><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif";color:windowtext"> <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>RobertWichert<br>
<b>Sent:</b> Thursday, June 28, 2012 10:26 AM<br><b>To:</b> <a href="mailto:equest-users@lists.onebuilding.org" target="_blank">equest-users@lists.onebuilding.org</a></span></p><div><div class="h5"><br><b>Subject:</b> Re: [Equest-users] VRF system in eQUEST<u></u><u></u></div>
</div><p></p></div></div><div><div class="h5"><p class="MsoNormal"><u></u> <u></u></p><div><p class="MsoNormal">Have you considered bundling the zones into one DX zone combining the loads and then using the AHRI SEER and EER for the entire bundle? That seems pretty simple to me. <br>
<br><br><br><u></u><u></u></p><pre>Robert Wichert P.Eng. LEED AP BD&C<u></u><u></u></pre><pre><a href="tel:%2B1%20916%20966%209060" value="+19169669060" target="_blank">+1 916 966 9060</a><u></u><u></u></pre><pre>FAX <a href="tel:%2B1%20916%20966%209068" value="+19169669068" target="_blank">+1 916 966 9068</a><u></u><u></u></pre>
<pre><u></u> <u></u></pre><pre><u></u> <u></u></pre><pre><u></u> <u></u></pre><pre><u></u> <u></u></pre><pre><u></u> <u></u></pre><pre><u></u> <u></u></pre><pre><u></u> <u></u></pre><pre>===============================================<u></u><u></u></pre>
<p class="MsoNormal">On 6/28/2012 7:13 AM, Matt Clough wrote:<u></u><u></u></p></div><blockquote style="margin-top:5.0pt;margin-bottom:5.0pt"><p class="MsoNormal"><span style="color:#1f497d">I am in a similar situation and wanted to contribute to the discussion.</span><u></u><u></u></p>
<p class="MsoNormal"><span style="color:#1f497d"> </span><u></u><u></u></p><p class="MsoNormal"><span style="color:#1f497d">Of the two approaches proposed by the BSUG (wshp vs. air cooled), which is the most accurate? Which is more conservative? Does one seem to be preferred over the other? </span><u></u><u></u></p>
<p class="MsoNormal"><span style="color:#1f497d"> </span><u></u><u></u></p><p class="MsoNormal"><span style="color:#1f497d">I like the WSHP approach because the way the systems are separated seems most like the way a vrv is actually assembled. The condenser water loop represents the exchange between the rooftop condenser and the refrigerant branch selector. The pvvt systems represent the fan coils for each zone. At least, I think I’m understanding this correctly. I like that I am able to put group the fan coil units as if they are connected to the same condenser, but I don’t really know that much and wonder if this really matters as far as a simulation is concerned. </span><u></u><u></u></p>
<p class="MsoNormal"><span style="color:#1f497d"> </span><u></u><u></u></p><p class="MsoNormal"><span style="color:#1f497d">From the literature, it seems that the advantage of using the air cooled condenser is the access to the variable speed compressor (although I have been able to select that option in the DDE). What are some of the other advantages of using the air-cooled condenser?</span><u></u><u></u></p>
<p class="MsoNormal"><span style="color:#1f497d"> </span><u></u><u></u></p><p class="MsoNormal"><span style="color:#1f497d">Regards,</span><u></u><u></u></p><p class="MsoNormal"><span style="color:#1f497d">Matt Clough</span><u></u><u></u></p>
<p class="MsoNormal"><span style="color:#1f497d"> </span><u></u><u></u></p><div><div style="border:none;border-top:solid #b5c4df 1.0pt;padding:3.0pt 0in 0in 0in"><p class="MsoNormal"><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""> Alea German [<a href="mailto:agerman@davisenergy.com" target="_blank">mailto:agerman@davisenergy.com</a>] <br>
<b>Sent:</b> Wednesday, June 27, 2012 3:19 PM<br><b>To:</b> Eleni Soulti; <a href="mailto:equest-users@lists.onebuilding.org" target="_blank">equest-users@lists.onebuilding.org</a>; <a href="mailto:bldg-sim@lists.onebuilding.org" target="_blank">bldg-sim@lists.onebuilding.org</a><br>
<b>Subject:</b> Re: [Equest-users] VRF system in eQUEST</span><u></u><u></u></p></div></div><p class="MsoNormal"> <u></u><u></u></p><p class="MsoNormal"><span style="color:#1f497d">Hi Eleni,</span><u></u><u></u></p><p class="MsoNormal">
<span style="color:#1f497d">There are a resource that has been put together by modelers at the Energy Trust of Oregon on a work-around for VRF systems in eQUEST, see attached. Yes, the method is to use PVVT system types. If heat recovery is available there is a post-processing step with the hourly data to identify when simultaneous loads occur. </span><u></u><u></u></p>
<p class="MsoNormal"><span style="color:#1f497d">Alea</span><u></u><u></u></p><p class="MsoNormal"><span style="color:#1f497d"> </span><u></u><u></u></p><div><p class="MsoNormal"><i>____________</i><u></u><u></u></p><p class="MsoNormal">
<b><i>Alea German</i></b><u></u><u></u></p><p class="MsoNormal"><span style="font-size:10.0pt">Davis Energy Group</span><u></u><u></u></p><p class="MsoNormal"><span style="font-size:10.0pt"><a href="mailto:agerman@davisenergy.com" target="_blank">agerman@davisenergy.com</a></span><u></u><u></u></p>
<p class="MsoNormal"><span style="font-size:10.0pt">ph: <a href="tel:530-753-1100%20x30" value="+15307531100" target="_blank">530-753-1100 x30</a></span><u></u><u></u></p><p class="MsoNormal"><span style="font-size:10.0pt">123 C Street</span><u></u><u></u></p>
<p class="MsoNormal"><span style="font-size:10.0pt">Davis, CA 95616</span><u></u><u></u></p></div><table border="0" cellspacing="0" cellpadding="0" align="left" width="98%" style="width:98.08%;border-collapse:collapse"><tbody><tr style="min-height:12.0pt">
<td width="100%" style="width:100.0%;padding:0in 0in 0in 0in;min-height:12.0pt"><p class="MsoNormal"><b><span style="font-family:Webdings;color:green;letter-spacing:1.0pt">P</span></b><b><span style="font-size:7.0pt"> Please consider the environment before printing this email</span></b><u></u><u></u></p>
</td></tr></tbody></table><p class="MsoNormal"><span style="color:#1f497d"> </span><u></u><u></u></p><p class="MsoNormal"><span style="color:#1f497d"> </span><u></u><u></u></p><div><div style="border:none;border-top:solid #b5c4df 1.0pt;padding:3.0pt 0in 0in 0in">
<p class="MsoNormal"><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""> Eleni Soulti [<a href="mailto:elenisoulti@co2engineering.eu" target="_blank">mailto:elenisoulti@co2engineering.eu</a>] <br>
<b>Sent:</b> Tuesday, June 26, 2012 11:25 PM<br><b>To:</b> <a href="mailto:equest-users@lists.onebuilding.org" target="_blank">equest-users@lists.onebuilding.org</a>; <a href="mailto:bldg-sim@lists.onebuilding.org" target="_blank">bldg-sim@lists.onebuilding.org</a><br>
<b>Subject:</b> [Equest-users] VRF system in eQUEST</span><u></u><u></u></p></div></div><p class="MsoNormal"> <u></u><u></u></p><p class="MsoNormal"><span lang="EN-GB">Dear all, </span><u></u><u></u></p><p class="MsoNormal">
<span lang="EN-GB"> </span><u></u><u></u></p><p class="MsoNormal"><span lang="EN-GB">I am new to eQUEST and trying to model a VRF system. There is no such option, so I think some people model it as PVVT. Any suggestions or resources on that? Thank you very much.</span><u></u><u></u></p>
<p class="MsoNormal"><span lang="EN-GB"> </span><u></u><u></u></p><p class="MsoNormal"><span lang="EN-GB">Regards,</span><u></u><u></u></p><p class="MsoNormal"><span lang="EN-GB"> </span><u></u><u></u></p><p class="MsoNormal">
<span lang="EN-GB">Eleni Soulti</span><u></u><u></u></p><p class="MsoNormal"><span lang="EN-GB"> </span><u></u><u></u></p><p class="MsoNormal"><span style="font-size:8.0pt;font-family:"Arial","sans-serif";color:#7f7f7f">On behalf of</span><u></u><u></u></p>
<p class="MsoNormal"><span style="font-size:8.0pt;font-family:"Arial","sans-serif";color:#7f7f7f"> </span><u></u><u></u></p><p class="MsoNormal"><b><span style="font-size:14.0pt;font-family:"Snap ITC ;color:#7F7F7F","serif"">C</span></b><b><span style="font-size:14.0pt;font-family:"Snap ITC ;color:#E1FF2D","serif"">O</span></b><b><span style="font-size:6.0pt;font-family:"Snap ITC ;color:#7F7F7F","serif"">2</span></b><u></u><u></u></p>
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<p class="MsoNormal"><span style="font-size:7.5pt;font-family:"Arial","sans-serif";color:#7f7f7f">T. (0034) 679883055 </span><u></u><u></u></p><p class="MsoNormal"><span style="font-size:7.5pt;font-family:"Arial","sans-serif";color:#222222"> </span><u></u><u></u></p>
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<p class="MsoNormal"><b><span style="font-size:7.5pt;font-family:"Arial","sans-serif";color:#ccee00"> </span></b><u></u><u></u></p><p class="MsoNormal"><span lang="ES" style="font-size:7.5pt;font-family:"Arial","sans-serif";color:#7f7f7f">Oficina Huelva.<br>
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