<div dir="ltr">Hi All,<div><br></div><div>I'm modeling a "heat pump" type chiller (air-cooled) and I'm trying to figure out the dependent variables about which the default curves are normalized so that I can create my own curves. Below is the screen-shot for my heat pump Performance Curves.</div><div><img src="cid:ii_mpe4x0a00" alt="image.png" width="542" height="378"></div><div>For example, the heating EIR curve that is a function of evap leaving T (SWT) & cond entering T (OAT): does anyone know the leaving water temperature and entering air temperature at which point this curve is normalized (i.e. returns an EIR value of 1.000)? I used goal seek for various combination of temperatures and here are some options (yellow cell was
calculated using GOAL-SEEK ):</div><div><br></div><div><table border="0" cellpadding="0" cellspacing="0" width="457" style="border-collapse:collapse;width:343pt">
<colgroup><col width="159" style="width:119pt">
<col width="64" span="3" style="width:48pt">
<col width="42" style="width:32pt">
<col width="64" style="width:48pt">
</colgroup><tbody><tr height="20" style="height:15pt">
<td height="20" class="gmail-xl73" width="159" style="height:15pt;width:119pt;text-align:right;padding:0px;color:black;font-size:11pt;font-family:Calibri,sans-serif;vertical-align:bottom;border-width:medium;border-style:none;border-color:currentcolor;white-space:nowrap">SWT
-></td>
<td class="gmail-xl74" align="right" width="64" style="width:48pt;border:0.5pt solid windowtext;padding:0px;color:black;font-size:11pt;font-family:Calibri,sans-serif;vertical-align:bottom;white-space:nowrap">120</td>
<td class="gmail-xl74" align="right" width="64" style="border-width:0.5pt 0.5pt 0.5pt medium;border-style:solid solid solid none;border-color:windowtext windowtext windowtext currentcolor;width:48pt;padding:0px;color:black;font-size:11pt;font-family:Calibri,sans-serif;vertical-align:bottom;white-space:nowrap">115</td>
<td class="gmail-xl75" align="right" width="64" style="border-width:0.5pt 0.5pt 0.5pt medium;border-style:solid solid solid none;border-color:windowtext windowtext windowtext currentcolor;width:48pt;background:yellow;padding:0px;color:black;font-size:11pt;font-family:Calibri,sans-serif;vertical-align:bottom;white-space:nowrap">115.6816</td>
<td class="gmail-xl74" align="right" width="42" style="border-width:0.5pt 0.5pt 0.5pt medium;border-style:solid solid solid none;border-color:windowtext windowtext windowtext currentcolor;width:32pt;padding:0px;color:black;font-size:11pt;font-family:Calibri,sans-serif;vertical-align:bottom;white-space:nowrap">105</td>
<td class="gmail-xl75" align="right" width="64" style="border-width:0.5pt 0.5pt 0.5pt medium;border-style:solid solid solid none;border-color:windowtext windowtext windowtext currentcolor;width:48pt;background:yellow;padding:0px;color:black;font-size:11pt;font-family:Calibri,sans-serif;vertical-align:bottom;white-space:nowrap">112.2388</td>
</tr>
<tr height="20" style="height:15pt">
<td height="20" class="gmail-xl73" style="height:15pt;text-align:right;padding:0px;color:black;font-size:11pt;font-family:Calibri,sans-serif;vertical-align:bottom;border-width:medium;border-style:none;border-color:currentcolor;white-space:nowrap">OAT -></td>
<td class="gmail-xl75" align="right" style="border-width:medium 0.5pt 0.5pt;border-style:none solid solid;border-color:currentcolor windowtext windowtext;background:yellow;padding:0px;color:black;font-size:11pt;font-family:Calibri,sans-serif;vertical-align:bottom;white-space:nowrap">54.36586</td>
<td class="gmail-xl75" align="right" style="border-width:medium 0.5pt 0.5pt medium;border-style:none solid solid none;border-color:currentcolor windowtext windowtext currentcolor;background:yellow;padding:0px;color:black;font-size:11pt;font-family:Calibri,sans-serif;vertical-align:bottom;white-space:nowrap">61.10728</td>
<td class="gmail-xl74" align="right" style="border-width:medium 0.5pt 0.5pt medium;border-style:none solid solid none;border-color:currentcolor windowtext windowtext currentcolor;padding:0px;color:black;font-size:11pt;font-family:Calibri,sans-serif;vertical-align:bottom;white-space:nowrap">47</td>
<td class="gmail-xl75" align="right" style="border-width:medium 0.5pt 0.5pt medium;border-style:none solid solid none;border-color:currentcolor windowtext windowtext currentcolor;background:yellow;padding:0px;color:black;font-size:11pt;font-family:Calibri,sans-serif;vertical-align:bottom;white-space:nowrap">39.21</td>
<td class="gmail-xl74" align="right" style="border-width:medium 0.5pt 0.5pt medium;border-style:none solid solid none;border-color:currentcolor windowtext windowtext currentcolor;padding:0px;color:black;font-size:11pt;font-family:Calibri,sans-serif;vertical-align:bottom;white-space:nowrap">44</td>
</tr>
<tr height="20" style="height:15pt">
<td height="20" class="gmail-xl73" style="height:15pt;text-align:right;padding:0px;color:black;font-size:11pt;font-family:Calibri,sans-serif;vertical-align:bottom;border-width:medium;border-style:none;border-color:currentcolor;white-space:nowrap">Goal Seek set to 1.000 -></td>
<td class="gmail-xl74" align="right" style="border-width:medium 0.5pt 0.5pt;border-style:none solid solid;border-color:currentcolor windowtext windowtext;padding:0px;color:black;font-size:11pt;font-family:Calibri,sans-serif;vertical-align:bottom;white-space:nowrap">1.003649</td>
<td class="gmail-xl74" align="right" style="border-width:medium 0.5pt 0.5pt medium;border-style:none solid solid none;border-color:currentcolor windowtext windowtext currentcolor;padding:0px;color:black;font-size:11pt;font-family:Calibri,sans-serif;vertical-align:bottom;white-space:nowrap">0.999675</td>
<td class="gmail-xl74" align="right" style="border-width:medium 0.5pt 0.5pt medium;border-style:none solid solid none;border-color:currentcolor windowtext windowtext currentcolor;padding:0px;color:black;font-size:11pt;font-family:Calibri,sans-serif;vertical-align:bottom;white-space:nowrap">0.99995</td>
<td class="gmail-xl74" align="right" style="border-width:medium 0.5pt 0.5pt medium;border-style:none solid solid none;border-color:currentcolor windowtext windowtext currentcolor;padding:0px;color:black;font-size:11pt;font-family:Calibri,sans-serif;vertical-align:bottom;white-space:nowrap">1</td>
<td class="gmail-xl74" align="right" style="border-width:medium 0.5pt 0.5pt medium;border-style:none solid solid none;border-color:currentcolor windowtext windowtext currentcolor;padding:0px;color:black;font-size:11pt;font-family:Calibri,sans-serif;vertical-align:bottom;white-space:nowrap">0.999975</td>
</tr>
</tbody></table></div><div><span style="font-size:14.6667px;color:rgb(0,0,0);font-family:Calibri,sans-serif"><br></span></div><div>Based on these results, it's looking like perhaps 115F SWT and 47F OAT might be correct...but wanted to confirm.</div><div><br></div><div>Since there is a second heating EIR curve for OAT < 39F, does anyone know the leaving water temperature and entering air temperature at which point this curve is normalized?</div><div><br></div><div>Thanks,</div><div>Chris</div></div>