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<p>Jacopo,</p>
<p> It may be that the evaporator temperatures in the default
heating performance file do not correspond with the range of
evaporator temperatures that are occurring during your simulation.
Type954 is able to interpolate within the range of temperatures
(and flow rates, etc.) that is given in the file. However, it
cannot extrapolate beyond the range of numbers given. If you have
COP values for ambient temperatures from 5C to 20C in the data
file but the ambient temperature in your weather data is
consistently below 5C then the COP corresponding to 5C would
always be returned. Have a look in your *.log file; if the data
file is often being accessed with temperatures above or below the
range there will be a warning written there.</p>
<p>kind regards,</p>
<p> David</p>
<p><br>
</p>
<div class="moz-cite-prefix">On 2/4/2023 11:54 AM, Jacopo Valente
via TRNSYS-users wrote:<br>
</div>
<blockquote type="cite"
cite="mid:AM0PR06MB6546C5777D38FEB705E1A689A6D49@AM0PR06MB6546.eurprd06.prod.outlook.com">
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<p class="MsoNormal">Dear all,</p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">i’m using the type 954 to model an
air-to-air heat pump. Analyzing the results of my simulation,
the COP is almost constant during the heating working. I’m
using the default performance data file. The problem is only
for the heating working, while the COP varies for the cooling
working.</p>
<p class="MsoNormal">I can suppose there is some problem with
the default heating performance data.</p>
<p class="MsoNormal">Can u help me please?</p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">I try to attach an image of COP curve:</p>
<p class="MsoNormal"><img style="width:5.825in;height:2.0416in"
id="Immagine_x0020_3"
src="cid:part1.6exW3v3U.0KGo03gF@tess-inc.com" class=""
width="559" height="196"></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Thanks.</p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Best regards,</p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Jacopo Valente</p>
</div>
<br>
<fieldset class="moz-mime-attachment-header"></fieldset>
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<pre class="moz-signature" cols="72">--
***************************
David BRADLEY
Principal
Thermal Energy System Specialists, LLC
3 North Pinckney Street - suite 202
Madison, WI 53703 USA
P:+1.608.274.2577
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<a class="moz-txt-link-freetext" href="http://www.trnsys.com">http://www.trnsys.com</a></pre>
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