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<p class="MsoNormal">Hi Fred,<o:p></o:p></p>
<p class="MsoNormal">For VRF condensing units in eQUEST, the heating EIR is a function of other variables. You can use the following keyword expression to determine the heating EIR that is used by eQUEST. It can be entered as a user input expression into one
of the other keywords, so you can see how it changes when you change the other variables. (For example, you can enter it as an expression for MIN-UNLOAD-RATIO or MIN-HGB-RATIO, which have default values that are close to the heating EIR, in case you leave
the expression in when you simulate.) You can see all the variables that determine the heating EIR in the expression:<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">/* This expression will calculate the heating EIR that DOE-2.3 will use<o:p></o:p></p>
<p class="MsoNormal"> for a VRF condensing unit. You can input this as a user expression<o:p></o:p></p>
<p class="MsoNormal"> in another keyword such as MIN-UNLOAD-RATIO. */<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">#L("COOLING-EIR")*(#LR("EIR-FSST&SDT","COEFFICIENTS",0)<o:p></o:p></p>
<p class="MsoNormal">+#LR("EIR-FSST&SDT","COEFFICIENTS",1)*#L("HEAT-RATED-SST")<o:p></o:p></p>
<p class="MsoNormal">+#LR("EIR-FSST&SDT","COEFFICIENTS",2)*#L("HEAT-RATED-SST")**2<o:p></o:p></p>
<p class="MsoNormal">+#LR("EIR-FSST&SDT","COEFFICIENTS",3)*#L("HEAT-RATED-SDT")<o:p></o:p></p>
<p class="MsoNormal">+#LR("EIR-FSST&SDT","COEFFICIENTS",4)*#L("HEAT-RATED-SDT")**2<o:p></o:p></p>
<p class="MsoNormal">+#LR("EIR-FSST&SDT","COEFFICIENTS",5)*#L("HEAT-RATED-SST")<o:p></o:p></p>
<p class="MsoNormal">*#L("HEAT-RATED-SDT"))<o:p></o:p></p>
<p class="MsoNormal">/(#LR("EIR-FSST&SDT","COEFFICIENTS",0)<o:p></o:p></p>
<p class="MsoNormal">+#LR("EIR-FSST&SDT","COEFFICIENTS",1)*#L("COOL-RATED-SST")<o:p></o:p></p>
<p class="MsoNormal">+#LR("EIR-FSST&SDT","COEFFICIENTS",2)*#L("COOL-RATED-SST")**2<o:p></o:p></p>
<p class="MsoNormal">+#LR("EIR-FSST&SDT","COEFFICIENTS",3)*#L("COOL-RATED-SDT")<o:p></o:p></p>
<p class="MsoNormal">+#LR("EIR-FSST&SDT","COEFFICIENTS",4)*#L("COOL-RATED-SDT")**2<o:p></o:p></p>
<p class="MsoNormal">+#LR("EIR-FSST&SDT","COEFFICIENTS",5)*#L("COOL-RATED-SST")<o:p></o:p></p>
<p class="MsoNormal">*#L("COOL-RATED-SDT"))<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Remember that fan energy should be accounted for when converting rated EER or COP to EIR. Doug Maddox shows how to calculate VRF EIR in this presentation:<o:p></o:p></p>
<p class="MsoNormal"><a href="http://maddoxenergy.com/eQuest_DOE23_VRF.pdf">http://maddoxenergy.com/eQuest_DOE23_VRF.pdf</a><o:p></o:p></p>
<p class="MsoNormal">Cooling EIR for the condensing unit: (3.413/AHRI_EER-0.01138)/(1+0.01138)<o:p></o:p></p>
<p class="MsoNormal">I believe you would reverse the fan energy for heating. Heating EIR = (1/COP+0.01138)/(1-0.01138)<o:p></o:p></p>
<p class="MsoNormal">The constant 0.01138 is the allowance for indoor fan EIR.<o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">Also, I created a modified BDLDialogs.txt file to use with DOE2.3. The file adds these keyword capabilities to the eQUEST interface:<o:p></o:p></p>
<ul type="disc">
<li class="gmail-m-4634787887509830958msolistparagraph" style="mso-list:l0 level1 lfo1">
SYSTEM:RATED-FLOW<o:p></o:p></li><li class="gmail-m-4634787887509830958msolistparagraph" style="mso-list:l0 level1 lfo1">
SYSTEM:HRATED-FLOW<o:p></o:p></li><li class="gmail-m-4634787887509830958msolistparagraph" style="mso-list:l0 level1 lfo1">
SYSTEM:NUM-COOL-STAGES (for PVVT systems)<o:p></o:p></li><li class="gmail-m-4634787887509830958msolistparagraph" style="mso-list:l0 level1 lfo1">
SYSTEM:NUM-HEAT-STAGES (for PVVT systems)<o:p></o:p></li><li class="gmail-m-4634787887509830958msolistparagraph" style="mso-list:l0 level1 lfo1">
SYSTEM:LOW-FAN-PWR (for PVVT systems)<o:p></o:p></li><li class="gmail-m-4634787887509830958msolistparagraph" style="mso-list:l0 level1 lfo1">
SYSTEM:MAX-CAP/UNIT (for VRF coils)<o:p></o:p></li><li class="gmail-m-4634787887509830958msolistparagraph" style="mso-list:l0 level1 lfo1">
CONDENSING-UNIT:TYP-CAP/SYSTEM (for VRF condensing units)<o:p></o:p></li></ul>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">The file also adjusts the number of decimal places displayed for several keywords, such as the cooling EIR that you mentioned. I am happy to share this file with eQUEST users (it
is ~1.7 MB).<o:p></o:p></p>
<p class="MsoNormal">Regards,<o:p></o:p></p>
<p class="MsoNormal">~Bill<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<div>
<p class="MsoNormal"><b><span style="font-size:10.0pt;font-family:"Franklin Gothic Medium",sans-serif;color:black">William Bishop, PE, BEMP, BEAP, CEM, LEED AP<o:p></o:p></span></b></p>
<p class="MsoNormal"><b><span style="font-size:9.0pt;font-family:"Arial",sans-serif;color:black">Senior Energy Engineer<o:p></o:p></span></b></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<div style="border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0in 0in 0in">
<p class="MsoNormal"><b>From:</b> Equest-users <equest-users-bounces@lists.onebuilding.org>
<b>On Behalf Of </b>Porter, Frederick NOR via Equest-users<br>
<b>Sent:</b> Tuesday, June 4, 2019 7:22 PM<br>
<b>To:</b> equest-users@lists.onebuilding.org<br>
<b>Subject:</b> [Equest-users] VRF Heating COP in eQUEST<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">So, in the VRF interface I can enter Cooling EIR, but Heating EIR is calculated somehow from other inputs:<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><img border="0" width="715" height="474" style="width:7.4479in;height:4.9375in" id="Picture_x0020_1" src="cid:image008.png@01D51B76.269AD5B0"><o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">The 0.3 above is actually 0.29, reflected below. But how best to get the heating EIR to 0.30, instead of 0.34? I was thinking of changing some of these “Heating Rated” temperatures. But I’d like to know if someone else has done this successfully.
<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><img border="0" width="787" height="191" style="width:8.1979in;height:1.9895in" id="Picture_x0020_2" src="cid:image009.png@01D51B76.269AD5B0"><o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Fred<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><b><span style="color:black">Fred Porter, LEED</span><span style="color:#1F497D">©</span><span style="color:black"> AP<o:p></o:p></span></b></p>
<p class="MsoNormal" style="margin-bottom:2.0pt"><span style="color:#7F7F7F">Principal Engineer<o:p></o:p></span></p>
<p class="MsoNormal" style="margin-bottom:2.0pt"><span style="color:#7F7F7F">Sustainability Services<o:p></o:p></span></p>
<p class="MsoNormal"><b><span style="color:#005DAA">NORESCO<o:p></o:p></span></b></p>
<p class="MsoNormal"><o:p> </o:p></p>
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