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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">When I have modeled VRF systems I have always used the PVVT system type in eQUEST as recommended in this presentation:
<a href="http://energytrust.org/library/bsug-files/modeling_real_performance_of_vrf_systems_kc-05.15.13.pdf">
http://energytrust.org/library/bsug-files/modeling_real_performance_of_vrf_systems_kc-05.15.13.pdf</a>
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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">Using the efficiencies and the curves for the VRF system will get you pretty close, but if you want to account for heat-recovery within the system (one terminal
unit in cooling while another is in heating), you will have to do some post-processing calculations.
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<b><span style="font-size:9.0pt;font-family:"Verdana",sans-serif;color:#6F1200">Nathan Miller, PE, LEED AP BD+C</span></b><b><span style="font-size:9.0pt;font-family:"Verdana",sans-serif;color:#632423"> –
</span></b><i><span style="font-size:8.0pt;font-family:"Verdana",sans-serif;color:black">Mechanical Engineer/Senior Energy Analyst</span></i><b><span style="font-size:9.0pt;font-family:"Verdana",sans-serif;color:#632423"><o:p></o:p></span></b></p>
<p class="MsoNormal" style="margin-top:3.0pt;line-height:115%"><b><span style="font-size:8.0pt;line-height:115%;font-family:"Verdana",sans-serif;color:#6F1200">RUSHING</span></b><span style="font-size:8.0pt;line-height:115%;font-family:"Verdana",sans-serif;color:#BFAB7F">
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</span><span style="font-size:8.0pt;line-height:115%;font-family:"Verdana",sans-serif;color:black">206-788-4577 |</span><span style="font-size:8.0pt;line-height:115%;font-family:"Verdana",sans-serif;color:#BFAB7F">
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<p class="MsoNormal" style="line-height:115%"><b><span style="font-size:8.0pt;line-height:115%;font-family:"Verdana",sans-serif;color:#6F1200"><a href="http://www.rushingco.com/"><span style="color:#6F1200">www.rushingco.com</span></a></span></b><b><span style="font-size:9.0pt;line-height:115%;font-family:"Verdana",sans-serif;color:#6F1200"><o:p></o:p></span></b></p>
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<p class="MsoNormal"><b><span style="font-size:11.0pt;font-family:"Calibri",sans-serif">From:</span></b><span style="font-size:11.0pt;font-family:"Calibri",sans-serif"> Equest-users [mailto:equest-users-bounces@lists.onebuilding.org]
<b>On Behalf Of </b>Rathna Shree<br>
<b>Sent:</b> Wednesday, May 27, 2015 3:18 AM<br>
<b>To:</b> BldgSim Mailing List; equest-users@onebuilding.org<br>
<b>Subject:</b> [Equest-users] VRF performance curve<o:p></o:p></span></p>
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<p class="MsoNormal" style="background:white"><span style="font-family:"Helvetica",sans-serif;color:black">Dear All,<o:p></o:p></span></p>
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<p class="MsoNormal" style="background:white"><span style="font-family:"Helvetica",sans-serif;color:black">I worked on a couple of projects in equest using the VRF performance curves from Daikin and LG. The methodology i followed is as below:<o:p></o:p></span></p>
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<p class="MsoNormal" style="background:white"><span style="font-family:"Helvetica",sans-serif;color:black">1) Modelled packaged VAV with minimum flow ratio 1.
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<p class="MsoNormal" style="background:white"><span style="font-family:"Helvetica",sans-serif;color:black">2) Created systems based on number of ODU's and assigned multiple zones to the respective ODU. (Just like modelling a AHU)<o:p></o:p></span></p>
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<p class="MsoNormal" style="background:white"><span style="font-family:"Helvetica",sans-serif;color:black">3) Inputted the ODU Cooling capacity and supply flow<o:p></o:p></span></p>
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<p class="MsoNormal" style="background:white"><span style="font-family:"Helvetica",sans-serif;color:black">4) Fans will be constant volume.<o:p></o:p></span></p>
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<p class="MsoNormal" style="background:white"><span style="font-family:"Helvetica",sans-serif;color:black">5) Since it is a cooling only system, i assigned only the "Cool EIR - fEWB-OAT", "Cool-EIR-fPLR" and "Cool cap-fEWB&OAT" curves. Rest were all default
DX unit curves.<o:p></o:p></span></p>
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<p class="MsoNormal" style="background:white"><span style="font-family:"Helvetica",sans-serif;color:black"><o:p> </o:p></span></p>
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<p class="MsoNormal" style="background:white"><span style="font-family:"Helvetica",sans-serif;color:black"> PVAV system is used as PSZ system cannot handle multiple zones well thus causing unmet hours.<o:p></o:p></span></p>
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<p class="MsoNormal" style="background:white"><span style="font-family:"Helvetica",sans-serif;color:black"><o:p> </o:p></span></p>
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<p class="MsoNormal" style="background:white"><span style="font-family:"Helvetica",sans-serif;color:black">I did 2 trials, one with default DX curves and the other with performance curves from LG and Daikin. The results showed a decrease in cooling energy consumption
by more than 30% thus impacting the overall energy consumption by more than 10%.
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<p class="MsoNormal" style="background:white"><span style="font-family:"Helvetica",sans-serif;color:black">Is the simulation methodology and results appropriate? I feel the savings is on a higher side.<o:p></o:p></span></p>
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<p class="MsoNormal" style="background:white"><span style="font-family:"Helvetica",sans-serif;color:black"><o:p> </o:p></span></p>
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<p class="MsoNormal" style="background:white"><span style="font-family:"Helvetica",sans-serif;color:black">Please advise.<o:p></o:p></span></p>
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<p class="MsoNormal" style="background:white"><span style="font-family:"Helvetica",sans-serif;color:black"><o:p> </o:p></span></p>
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<p class="MsoNormal" style="background:white"><span style="font-family:"Helvetica",sans-serif;color:black">Regards,<o:p></o:p></span></p>
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<p class="MsoNormal" style="background:white"><span style="font-family:"Helvetica",sans-serif;color:black">Rathnashree<o:p></o:p></span></p>
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