<div dir="ltr"><div><div><div><div><div><div><div><div><div><div><div><div><div><div><div><div><span style="color:rgb(0,0,255)">Dear Sambhav,<br><br></span></div><span style="color:rgb(0,0,255)">I have done some analysis over these curves.<br></span></div><span style="color:rgb(0,0,255)">What i found is that only bi-quadratic dependent on T can be imported in the following place</span>.<br><br><img style="margin-right: 0px;" alt="Inline image 2" src="cid:ii_14db4420a66981f0" height="167" width="420"><br><br></div><div><span style="color:rgb(0,0,255)">Also a sample bi-quadratic -T has been pasted below</span><br></div><div><br><img alt="Inline image 3" src="cid:ii_14db4451e322e3c9" height="300" width="404"><br><span style="color:rgb(0,0,255)"><br></span></div><span style="color:rgb(0,0,255)">Now the resulting Z is EIR depending upon X (External wet bulb temperature) and Y (Outside dry bulb temperature) which can be observed in the first figure, where bi-quadratic dependent on T can be imported.</span><br><span style="color:rgb(0,0,255)"><br>..................................................................................................................<br></span></div><span style="color:rgb(0,0,255)">Also the wet bulb and dry bulb temperature are of air and not of any liquid (refrigerant or water).<br><br></span></div><span style="color:rgb(0,0,255)">Hence this curve is totally dependent upon the external air and temperature conditions .Hence as per me the curve can be used for any heat pump.</span><br></div><span style="color:rgb(0,0,255)"><br>.......................................................................................................................<br></span></div><span style="color:rgb(0,0,255)">Now the part load based EIR curve is bi-quadratic dependent on part load value. A sample curve is given below.</span><br><br><img alt="Inline image 4" src="cid:ii_14db44a735156e6b" height="304" width="404"><br><br></div><span style="color:rgb(0,0,255)">This is bi-quadratic but not dependent upon T else on IPLV or part load ratio.<br></span></div><span style="color:rgb(0,0,255)">Also EIR based on IPLV is calculated by bi-quadratic equations with four curve coefficients and one variable as part load ratio (IPLV with efficiencies at various loading percentages). You can surf it on internet.</span><span style="color:rgb(0,0,255)"><br></span></div><span style="color:rgb(0,0,255)"><br></span></div><span style="color:rgb(0,0,255)">Hope this can help.<br><br></span></div><span style="color:rgb(0,0,255)">Thanks,<br></span></div><span style="color:rgb(0,0,255)">Sharad .Kumar<br></span></div><span style="color:rgb(0,0,255)">Green Horizon Consulting LLP<br></span></div><span style="color:rgb(0,0,255)">Gurgaon<br></span></div><span style="color:rgb(0,0,255)">India.</span><br><a href="https://www.linkedin.com/profile/view?id=151208255&trk=nav_responsive_tab_profile">https://www.linkedin.com/profile/view?id=151208255&trk=nav_responsive_tab_profile</a><br><div><br><div><div><div><div><div><div><div><div><div><div><div><div><div><div><div><div><div class="gmail_extra"><br><div class="gmail_quote">On Tue, Jun 2, 2015 at 1:32 AM, <span dir="ltr"><<a href="mailto:equest-users-request@lists.onebuilding.org" target="_blank">equest-users-request@lists.onebuilding.org</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">Send Equest-users mailing list submissions to<br>
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1. Re: Daikin heat pump curves (Sambhav Tiwari)<br>
<br><br>---------- Forwarded message ----------<br>From: Sambhav Tiwari <<a href="mailto:tiwari.sambhav@gmail.com">tiwari.sambhav@gmail.com</a>><br>To: Julien Marrec <<a href="mailto:julien.marrec@gmail.com">julien.marrec@gmail.com</a>><br>Cc: equest-users <<a href="mailto:equest-users@lists.onebuilding.org">equest-users@lists.onebuilding.org</a>><br>Date: Mon, 1 Jun 2015 03:31:49 -0700<br>Subject: Re: [Equest-users] Daikin heat pump curves<br><div dir="ltr">These curves are same for all HP units how is it possible<div><br></div><div>Regards</div><div>Sambhav</div></div><div class="gmail_extra"><br><div class="gmail_quote">On Thu, Jul 17, 2014 at 4:45 AM, Julien Marrec <span dir="ltr"><<a href="mailto:julien.marrec@gmail.com" target="_blank">julien.marrec@gmail.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div dir="ltr"><div><div><div>Hi,<br><br></div>I've been trying to model a Daikin VRV system and trying to figure out why I was getting 100 times more space heating in the proposed (VRV) model compared to the baseline model (PTHP). After isolating the problem to the VRV, I found a conversation from March 2014 between a few folks (Byron Burns and Bill Bishop mostly - thank you both!), that basically explained why I was getting the issue: the .inp data from Daikin isn't importing correctly.<br>
<br></div>I just wanted to say that we're in July now, and this still hasn't been fixed (I downloaded the curve from Daikin a few days ago), so if you're having the problem, the fix proposed by Byron and Bill still works. It consists in to replacing the VRV Heating Curve with:<br>
<br>"VRV Heating EIR-F-EWB/ODB AC" = CURVE-FIT <br> TYPE = BI-QUADRATIC-T<br> INPUT-TYPE = COEFFICIENTS<br> COEFFICIENTS = ( -1.85025, 0.0620141, -0.000312822, 0.07145853, <br>
-0.0003626328, -0.0007776424 )<br>
..<br><br></div>(at least that's how I understood it and it seems to be working).<br><div><br></div><div>I've attached the performance curves with repaired Heating EIR for VRV.<br></div><div><br>I'll email Daikin to let them know (again), maybe others will want to do the same so that they realize this is a problem encountered by more than one individual<br>
<br><br></div><div>Have a great day,<br>Julien<br><div><div><div><div><div dir="ltr"><div>--<br>Julien Marrec, EBCP, BPI MFBA<br>Energy&Sustainability Engineer<br>T: +33 6 95 14 42 13<br><span style="color:rgb(0,0,0)"><br>
</span></div>LinkedIn (en) : <span style="color:rgb(0,0,0)"><a href="http://www.linkedin.com/in/julienmarrec" target="_blank">www.linkedin.com/in/julienmarrec</a></span></div></div>
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