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<p>Hello Chris,</p>
<p> </p>
<p>In regards to your VRF posting. We are currently finishing some work for the U.S. Army to verify the performance of a side-by-side test of a VRF system, which we have accomplished with a calibrated simulation. The results show a 35 to 50% savings when compared
to the baseline air-cooled HVAC in the 1/2 of the building that was not retrofitted. The biggest factor in the savings is the individual zoning and the combination of zoning with motion sensors at each thermostat, which creates a building that has partial
conditioning and different thermostat schedules for each zone, not simple to simulate. These results are based on measured data taken over the last 18 months.</p>
<p> </p>
<p>Jeff</p>
<p><font color="#0000ff" size="2" face="Tahoma"></font> </p>
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<div><font color="#0000ff" size="2" face="Tahoma">8=! 8=) :=) 8=) ;=) 8=) 8=( 8=) 8=() 8=) 8=| 8=) :=') 8=) 8=?<br>
Jeff S. Haberl, Ph.D.,P.E.inactive,FASHRAE,FIBPSA,......<a href="mailto:........jhaberl@tamu.edu">jhaberl@tamu.edu</a><br>
Professor........................................................................Office Ph: 979-845-6507<br>
Department of Architecture............................................Lab Ph:979-845-6065<br>
Energy Systems Laboratory...........................................FAX: 979-862-2457<br>
Texas A&M University...................................................77843-3581<br>
College Station, Texas, USA, 77843.............................http://esl.tamu.edu<br>
8=/ 8=) :=) 8=) ;=) 8=) 8=() 8=) :=) 8=) 8=! 8=) 8=? 8=) </font><font color="#0000ff" size="2" face="Tahoma">8=0<br>
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<div id="divRpF282240" style="DIRECTION: ltr"><font color="#000000" size="2" face="Tahoma"><b>From:</b> Bldg-sim [bldg-sim-bounces@lists.onebuilding.org] on behalf of Chris Yates [chris.malcolm.yates@gmail.com]<br>
<b>Sent:</b> Thursday, May 28, 2015 6:27 AM<br>
<b>To:</b> Qureshi, Harris; BldgSim Mailing List<br>
<b>Subject:</b> Re: [Bldg-sim] VRF performance curve<br>
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<div>Interesting post and thanks for the info - I find VRF a bit of a 'black box' when it comes to modelling. Part of the issue is the huge variety of indoor/ outdoor unit combinations.</div>
<div><br>
<div>I have no doubt that the better VRF systems are a superb technology. However, I do believe some of the performance claims are audacious (I can only speak of the European market). For example, heat recovery VRF with seasonal average heating COP (kW/kW)
> 8.0 and seasonal Cooling EER > 6 is competing with centrifugal chillers - the most advanced VRF compressor technology I know of is scroll.</div>
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<div>I guess part of my beef is not trusting the Euro test standards for VRF!</div>
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<div>Bye for now</div>
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<div>Chris</div>
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<div class="gmail_extra"><br>
<div class="gmail_quote">On Wed, May 27, 2015 at 3:18 PM, Qureshi, Harris <span dir="ltr">
<<a href="mailto:Harris.Qureshi@stantec.com" target="_blank">Harris.Qureshi@stantec.com</a>></span> wrote:<br>
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<p class="MsoNormal"><span style="FONT-SIZE: 10pt; FONT-FAMILY: "Century Gothic","sans-serif"; COLOR: blue">Hi Rathna,<u></u><u></u></span></p>
<p class="MsoNormal"><span style="FONT-SIZE: 10pt; FONT-FAMILY: "Century Gothic","sans-serif"; COLOR: blue"><u></u><u></u></span> </p>
<p class="MsoNormal"><span style="FONT-SIZE: 10pt; FONT-FAMILY: "Century Gothic","sans-serif"; COLOR: blue">What software are you using ? You might want to go through the attached modelling protocol attached from LG as Sherif mentions .
<u></u><u></u></span></p>
<p class="MsoNormal"><span style="FONT-SIZE: 10pt; FONT-FAMILY: "Century Gothic","sans-serif"; COLOR: blue"><u></u><u></u></span> </p>
<p class="MsoNormal"><span style="FONT-SIZE: 10pt; FONT-FAMILY: "Century Gothic","sans-serif"; COLOR: blue">Harris
<u></u><u></u></span></p>
<p class="MsoNormal"><span style="FONT-SIZE: 10pt; FONT-FAMILY: "Century Gothic","sans-serif"; COLOR: blue"><u></u><u></u></span> </p>
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<p class="MsoNormal"><b><span style="FONT-SIZE: 10pt; FONT-FAMILY: "Century Gothic","sans-serif"; COLOR: rgb(255,155,38)">Harris Qureshi, B.E(Mech), MSc. Energy, LEED AP Homes</span></b><span style="FONT-SIZE: 10pt; FONT-FAMILY: "Century Gothic","sans-serif"; COLOR: rgb(255,155,38)"><u></u><u></u></span></p>
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<p class="MsoNormal"><span style="FONT-SIZE: 9pt; FONT-FAMILY: "Century Gothic","sans-serif"; COLOR: black">Mechanical Engineer<br>
Stantec<br>
Dubai Investment Park, PO Box 52764 Dubai UAE <br>
Phone: <a href="tel:%2B971-4-812-5947" target="_blank" value="+97148125947">+971-4-812-5947</a><br>
Cell: <a href="tel:%2B971-50-189-9924" target="_blank" value="+971501899924">+971-50-189-9924</a><br>
</span><a href="mailto:Harris.Qureshi@stantec.com" target="_blank"><span style="FONT-SIZE: 9pt; TEXT-DECORATION: none; FONT-FAMILY: "Century Gothic","sans-serif"; COLOR: black">Harris.Qureshi@stantec.com</span></a><span style="FONT-SIZE: 9pt; FONT-FAMILY: "Century Gothic","sans-serif"; COLOR: black"><u></u><u></u></span></p>
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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>
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<p class="MsoNormal"><span style="FONT-SIZE: 10pt; FONT-FAMILY: Webdings; COLOR: rgb(0,128,64)">ü</span><span style="COLOR: blue"> </span><span style="FONT-SIZE: 7pt; FONT-FAMILY: "Century Gothic","sans-serif"; COLOR: rgb(0,128,64)">Please consider the environment
before printing this email.</span><span style="COLOR: blue"> </span><span style="FONT-SIZE: 10pt; FONT-FAMILY: "Century Gothic","sans-serif"; COLOR: blue"><u></u><u></u></span></p>
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<p class="MsoNormal"><b><span style="FONT-SIZE: 10pt; FONT-FAMILY: "Tahoma","sans-serif"">From:</span></b><span style="FONT-SIZE: 10pt; FONT-FAMILY: "Tahoma","sans-serif""> Bldg-sim [</span><a href="mailto:bldg-sim-bounces@lists.onebuilding.org" target="_blank"><span style="FONT-SIZE: 10pt; FONT-FAMILY: "Tahoma","sans-serif"">mailto:bldg-sim-bounces@lists.onebuilding.org</span></a><span style="FONT-SIZE: 10pt; FONT-FAMILY: "Tahoma","sans-serif"">]
<b>On Behalf Of </b>Sherif Farag<br>
<b>Sent:</b> Wednesday, May 27, 2015 5:26 PM<br>
<b>To:</b> Rathna Shree<br>
<b>Cc:</b> BldgSim Mailing List; </span><a href="mailto:equest-users@onebuilding.org" target="_blank"><span style="FONT-SIZE: 10pt; FONT-FAMILY: "Tahoma","sans-serif"">equest-users@onebuilding.org</span></a><span style="FONT-SIZE: 10pt; FONT-FAMILY: "Tahoma","sans-serif""><br>
<b>Subject:</b> Re: [Bldg-sim] VRF performance curve<u></u><u></u></span></p>
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<p class="MsoNormal"><u></u><u></u> </p>
<p class="MsoNormal">Hi Rathna,<u></u><u></u></p>
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<p class="MsoNormal">LG has a plug-in that works good with eQuest, I tried it and I noticed the % of energy saving will be on the region of 20% when compared to PTAC (Not compared to the App G. Baseline).<u></u><u></u></p>
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<p class="MsoNormal">Thanks;<u></u><u></u></p>
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<p class="MsoNormal">Sherif Farag<u></u><u></u></p>
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<p class="MsoNormal">Technical Director<u></u><u></u></p>
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<p class="MsoNormal">Integrated Environmental Services (IES) Ltd. <u></u><u></u></p>
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<p class="MsoNormal">Abu Dhabi - UAE<u></u><u></u></p>
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<p class="MsoNormal"><u></u><u></u> </p>
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<p class="MsoNormal">On May 27, 2015, at 11:18 AM, Rathna Shree <<a href="mailto:rathnashreep@yahoo.in" target="_blank">rathnashreep@yahoo.in</a>> wrote:<u></u><u></u></p>
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<p class="MsoNormal" style="BACKGROUND: white"><span style="FONT-FAMILY: "Helvetica Neue"">Dear All,<u></u><u></u></span></p>
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<p class="MsoNormal" style="BACKGROUND: white"><span style="FONT-FAMILY: "Helvetica Neue""><u></u><u></u></span> </p>
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<p class="MsoNormal" style="BACKGROUND: white"><span style="FONT-FAMILY: "Helvetica Neue"">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:<u></u><u></u></span></p>
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<p class="MsoNormal" style="BACKGROUND: white"><span style="FONT-FAMILY: "Helvetica Neue""><u></u><u></u></span> </p>
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<p class="MsoNormal" style="BACKGROUND: white"><span style="FONT-FAMILY: "Helvetica Neue"">1) Modelled packaged VAV with minimum flow ratio 1.
<u></u><u></u></span></p>
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<p class="MsoNormal" style="BACKGROUND: white"><span style="FONT-FAMILY: "Helvetica Neue"">2) Created systems based on number of ODU's and assigned multiple zones to the respective ODU. (Just like modelling a AHU)<u></u><u></u></span></p>
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<p class="MsoNormal" style="BACKGROUND: white"><span style="FONT-FAMILY: "Helvetica Neue"">3) Inputted the ODU Cooling capacity and supply flow<u></u><u></u></span></p>
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<p class="MsoNormal" style="BACKGROUND: white"><span style="FONT-FAMILY: "Helvetica Neue"">4) Fans will be constant volume.<u></u><u></u></span></p>
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<p class="MsoNormal" style="BACKGROUND: white"><span style="FONT-FAMILY: "Helvetica Neue"">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.<u></u><u></u></span></p>
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<p class="MsoNormal" style="BACKGROUND: white"><span style="FONT-FAMILY: "Helvetica Neue""><u></u><u></u></span> </p>
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<p class="MsoNormal" style="BACKGROUND: white"><span style="FONT-FAMILY: "Helvetica Neue""> PVAV system is used as PSZ system cannot handle multiple zones well thus causing unmet hours.<u></u><u></u></span></p>
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<p class="MsoNormal" style="BACKGROUND: white"><span style="FONT-FAMILY: "Helvetica Neue""><u></u><u></u></span> </p>
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<p class="MsoNormal" style="BACKGROUND: white"><span style="FONT-FAMILY: "Helvetica Neue"">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%. <u></u><u></u></span></p>
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<p class="MsoNormal" style="BACKGROUND: white"><span style="FONT-FAMILY: "Helvetica Neue""><u></u><u></u></span> </p>
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<p class="MsoNormal" style="BACKGROUND: white"><span style="FONT-FAMILY: "Helvetica Neue"">Is the simulation methodology and results appropriate? I feel the savings is on a higher side.<u></u><u></u></span></p>
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<p class="MsoNormal" style="BACKGROUND: white"><span style="FONT-FAMILY: "Helvetica Neue""><u></u><u></u></span> </p>
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<p class="MsoNormal" style="BACKGROUND: white"><span style="FONT-FAMILY: "Helvetica Neue"">Please advise.<u></u><u></u></span></p>
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<p class="MsoNormal" style="BACKGROUND: white"><span style="FONT-FAMILY: "Helvetica Neue""><u></u><u></u></span> </p>
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<p class="MsoNormal" style="BACKGROUND: white"><span style="FONT-FAMILY: "Helvetica Neue"">Regards,<u></u><u></u></span></p>
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<p class="MsoNormal" style="BACKGROUND: white"><span style="FONT-FAMILY: "Helvetica Neue"">Rathnashree<u></u><u></u></span></p>
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