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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Franklin Gothic Book","sans-serif";color:#1F497D">As Cory noted, WSHP works well for water source VRF systems. Up here in the north, these systems typically have a boiler and fluid cooler for
maintaining the refrigerant loop temperature along with a circulating pump. The WSHP system captures the effects of “moving” energy from one side of the building to the other without post processing. Two of the three Daikin curves can be implemented in the
HP units and show additional savings. <o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Franklin Gothic Book","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
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<p class="MsoNormal"><b><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1C467A">Christopher Jones</span></b><b><span style="font-size:10.0pt;font-family:"Calibri","sans-serif";color:#1C467A">,</span></b><b><span style="font-size:10.0pt;font-family:"Calibri","sans-serif";color:#1F497D">
</span></b><span style="font-size:9.0pt;font-family:"Calibri","sans-serif";color:#1F497D">P.Eng.</span><i><span style="font-size:10.0pt;font-family:"Calibri","sans-serif";color:#1F497D">
<br>
</span></i><span lang="EN-CA" style="font-size:9.0pt;font-family:"Calibri","sans-serif";color:#1F497D">Tel: 416.644.4226 • Toll Free: 1.888.425.7255 x 527</span><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Franklin Gothic Book","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
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<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""> Bldg-sim [mailto:bldg-sim-bounces@lists.onebuilding.org]
<b>On Behalf Of </b>Nathan Miller<br>
<b>Sent:</b> Wednesday, May 27, 2015 9:05 AM<br>
<b>To:</b> Rathna Shree; BldgSim Mailing List; equest-users@onebuilding.org<br>
<b>Subject:</b> Re: [Bldg-sim] [Equest-users] VRF performance curve<o:p></o:p></span></p>
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<p class="MsoNormal"><o:p> </o:p></p>
<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>
<o:p></o:p></span></p>
<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.
<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
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<p class="MsoNormal" style="margin-top:1.0pt"><b><span style="font-size:10.0pt;font-family:"Verdana","sans-serif";color:#632423"><o:p> </o:p></span></b></p>
<p class="MsoNormal" style="mso-margin-top-alt:1.0pt;margin-right:0in;margin-bottom:4.0pt;margin-left:0in">
<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">
</span><b><span style="font-size:8.0pt;line-height:115%;font-family:"Verdana","sans-serif";color:#6F1200">O</span></b><span style="font-size:8.0pt;line-height:115%;font-family:"Verdana","sans-serif";color:#A50021">
</span><span style="font-size:8.0pt;line-height:115%;font-family:"Verdana","sans-serif";color:black">206-285-7100</span><span style="font-size:8.0pt;line-height:115%;font-family:"Verdana","sans-serif";color:#BFAB7F"><o:p></o:p></span></p>
<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"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></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 [<a href="mailto:equest-users-bounces@lists.onebuilding.org">mailto:equest-users-bounces@lists.onebuilding.org</a>]
<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; <a href="mailto:equest-users@onebuilding.org">equest-users@onebuilding.org</a><br>
<b>Subject:</b> [Equest-users] VRF performance curve<o:p></o:p></span></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<div id="yui_3_16_0_1_1432709861102_2418">
<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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<div id="yui_3_16_0_1_1432709861102_2532">
<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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<div id="yui_3_16_0_1_1432709861102_2563">
<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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<div id="yui_3_16_0_1_1432709861102_2596">
<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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<div id="yui_3_16_0_1_1432709861102_2597">
<p class="MsoNormal" style="background:white"><span style="font-family:"Helvetica","sans-serif";color:black">1) Modelled packaged VAV with minimum flow ratio 1.
<o:p></o:p></span></p>
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<div id="yui_3_16_0_1_1432709861102_2628">
<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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<div id="yui_3_16_0_1_1432709861102_2793">
<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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<div id="yui_3_16_0_1_1432709861102_2629">
<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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<div id="yui_3_16_0_1_1432709861102_2630">
<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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<div id="yui_3_16_0_1_1432709861102_2736">
<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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<div id="yui_3_16_0_1_1432709861102_2856">
<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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<div id="yui_3_16_0_1_1432709861102_2858">
<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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<div id="yui_3_16_0_1_1432709861102_2735">
<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%.
<o:p></o:p></span></p>
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<div id="yui_3_16_0_1_1432709861102_2748">
<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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<div id="yui_3_16_0_1_1432709861102_2829">
<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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<div id="yui_3_16_0_1_1432709861102_2871">
<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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<div id="yui_3_16_0_1_1432709861102_2872">
<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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<div id="yui_3_16_0_1_1432709861102_2830">
<p class="MsoNormal" style="background:white"><span style="font-family:"Helvetica","sans-serif";color:black"><o:p> </o:p></span></p>
</div>
<div id="yui_3_16_0_1_1432709861102_2853">
<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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<div id="yui_3_16_0_1_1432709861102_2854">
<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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