<div dir="ltr">Dear Bill and Jeff:<div><br></div><div>The problem arises when you plot for a fix hot water outlet (let's say 113ºF) the whole curve for exterior temperatures (from 9 to 59ºF), using the expression of 39- curve for values till 39ºF and 39+ for the rest of them.</div><div><br></div><div>It shows like this:</div><div> </div><div><img src="cid:ii_1511b7930b48b64e" alt="Imágenes integradas 1" width="493" height="229"><br></div><div><br></div><div>Shouldn't COP increase with higher exterior temperatures for a fixed hot water outlet temperature? It seems even to decay after 54ºF...</div><div><br></div><div>With capacity curves is the same, but in that case it makes more sense.</div><div><br></div><div>Thanks.</div><div><br></div></div><div class="gmail_extra"><br clear="all"><div><div class="gmail_signature"><div dir="ltr"><div><div dir="ltr"><blockquote style="margin:0px 0px 0px 0.8ex;border-left-width:1px;border-left-color:rgb(204,204,204);border-left-style:solid;padding-left:1ex"><table border="0" style="color:rgb(0,0,0);font-family:'Times New Roman';font-size:medium"><tbody><tr><td><img src="http://www-etsii.uned.es/examinar/escudoUNEDaltares.JPG" width="120" height="120"></td><td><p style="font-family:Verdana,Geneva,sans-serif;font-size:10px"><strong><font color="#00533E">Fernando Varela Díez</font></strong><br>Dpto. Ingeniería Energética - ETSI Industriales<br>Email: <a href="mailto:fvarela@ind.uned.es" target="_blank">fvarela@ind.uned.es</a><br>Tlf: 91 398 6468</p><p style="font-family:Verdana,Geneva,sans-serif;font-size:10px">Universidad Nacional de Educación a Distancia (UNED)<br>C/ Juan del Rosal, 12. Despacho 2.20<br>Ciudad Universitaria, 28040, Madrid</p></td></tr></tbody></table></blockquote><div><br></div></div></div></div></div></div>
<br><div class="gmail_quote">2015-11-17 16:03 GMT+01:00 Bishop, Bill <span dir="ltr"><<a href="mailto:bbishop@pathfinder-ea.com" target="_blank">bbishop@pathfinder-ea.com</a>></span>:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1f497d">Fernando,<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1f497d">The curves look okay to me. I plotted them out for a range of hot water temperatures from 90F to 130F.<u></u><u></u></span></p>
<p><u></u><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1f497d"><span>-<span style="font:7.0pt "Times New Roman"">
</span></span></span><u></u><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1f497d">I plotted the “…39+” curve for the range of entering dry bulb from 40F to 60F.<u></u><u></u></span></p>
<p><u></u><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1f497d"><span>-<span style="font:7.0pt "Times New Roman"">
</span></span></span><u></u><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1f497d">I plotted the ”…39-“ curve for the range of Edb from 20F to 38F.<u></u><u></u></span></p>
<p><u></u><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1f497d"><span>-<span style="font:7.0pt "Times New Roman"">
</span></span></span><u></u><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1f497d">Both curves show decreasing capacity as the heat pump chiller makes hotter water, which makes sense.<u></u><u></u></span></p>
<p><u></u><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1f497d"><span>-<span style="font:7.0pt "Times New Roman"">
</span></span></span><u></u><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1f497d">Both curves show decreasing capacity with lower outside air condenser temperatures, which makes sense.<u></u><u></u></span></p>
<p><u></u><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1f497d"><span>-<span style="font:7.0pt "Times New Roman"">
</span></span></span><u></u><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1f497d">The “…39-“ curve shows rapidly decreasing capacity with decreasing condenser temperature below 39F, which makes sense since larger portions of the chiller
heat pump heat is needed to defrost the condenser coils.<u></u><u></u></span></p>
<p><u></u><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1f497d"><span>-<span style="font:7.0pt "Times New Roman"">
</span></span></span><u></u><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1f497d">I’m guessing that the curves are normalized to 110F HWT and 44F Edb.<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1f497d">I can share an Excel file I used to generate the curves and chart if anybody wants it.<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1f497d">~Bill<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1f497d"><u></u> <u></u></span></p>
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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1f497d"><u></u> <u></u></span></p>
<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
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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:<a href="mailto:equest-users-bounces@lists.onebuilding.org" target="_blank">equest-users-bounces@lists.onebuilding.org</a>]
<b>On Behalf Of </b>Fernando Varela<br>
<b>Sent:</b> Tuesday, November 17, 2015 5:04 AM<br>
<b>To:</b> <a href="mailto:equest-users@lists.onebuilding.org" target="_blank">equest-users@lists.onebuilding.org</a><br>
<b>Subject:</b> [Equest-users] eQuest heat pump performance curves<u></u><u></u></span></p>
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<p class="MsoNormal"><span style="font-size:9.5pt">Dear users:</span><u></u><u></u></p>
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<p class="MsoNormal"><span style="font-size:9.5pt">I've noticed that eQuest heat pump performance curves:<u></u><u></u></span></p>
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<p class="MsoNormal"><span style="font-size:9.5pt">ChlrHPAirHeatCap-fHW&39+<u></u><u></u></span></p>
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<p class="MsoNormal"><span style="font-size:9.5pt">ChlrHPAirHeatCap-fHW&39-<u></u><u></u></span></p>
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<p class="MsoNormal"><span style="font-size:9.5pt">which refer, respectively, to the temperature capacity factor of the heat pump in normal and defrost mode, seem to be exchanged. This is, ChlrHPAirHeatCap-fHW&39+ curve seems to be the defrost mode curve, and
ChlrHPAirHeatCap-fHW&39- the curve regarding to normal mode.<u></u><u></u></span></p>
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<p class="MsoNormal"><span style="font-size:9.5pt">I've plotted (with fixed condensing temperature) both capacities varying exterior temperature, and observing the results taking the curves in the opposite way as it shoud be (below 39ºF,ChlrHPAirHeatCap-fHW&39+,
and ChlrHPAirHeatCap-fHW&39- above 39ºF ), the resulting HP capacity curve seems more like it should be.<u></u><u></u></span></p>
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<p class="MsoNormal"><span style="font-size:9.5pt">Am I doing something wrong?<u></u><u></u></span></p>
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<p class="MsoNormal"><span style="font-size:9.5pt">Thank you in advance.<u></u><u></u></span></p>
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<p><strong><span style="font-size:7.5pt;font-family:"Verdana",sans-serif;color:#00533e">Fernando Varela Díez</span></strong><span style="font-size:7.5pt;font-family:"Verdana",sans-serif;color:black"><br>
Dpto. Ingeniería Energética - ETSI Industriales<br>
Email: </span><a href="mailto:fvarela@ind.uned.es" target="_blank"><span style="font-size:7.5pt;font-family:"Verdana",sans-serif">fvarela@ind.uned.es</span></a><span style="font-size:7.5pt;font-family:"Verdana",sans-serif;color:black"><br>
Tlf: 91 398 6468<u></u><u></u></span></p>
<p><span style="font-size:7.5pt;font-family:"Verdana",sans-serif;color:black">Universidad Nacional de Educación a Distancia (UNED)<br>
C/ Juan del Rosal, 12. Despacho 2.20<br>
Ciudad Universitaria, 28040, Madrid<u></u><u></u></span></p>
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