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<p>Amirreza,</p>
<p> If the air and water conditions at the inlet of your heat pump
are always outside the range of the performance map then the power
and COP will always come back with the same values. Of course it
is also possible that the performance map that you are using is
set up in such a way that the COP is always the same no matter
what the inlet conditions. The *.lst file may have some additional
clues in it.<br>
</p>
<p>kind regards,</p>
<p> David</p>
<p><br>
</p>
<p><br>
</p>
<div class="moz-cite-prefix">On 01/03/2021 05:16, Heidari Amirreza
via TRNSYS-users wrote:<br>
</div>
<blockquote type="cite"
cite="mid:5024145290674c4aaf126f39cf9cb8a5@epfl.ch">
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<p>Hello,</p>
<p><br>
</p>
<p>To model a heat pump water heating system I am using type
938. In theory, the COP of the heat pump should decrease with
the increase of storage tank temperature. Also, it should
increase with the increase of outdoor air temperature.
However, using type 938 the power consumption is always the
same. Would you please let me know how it can be modified in
my simulation?</p>
<p><span style="font-size: 12pt;"><br>
</span></p>
<p><span style="font-size: 12pt;"><img size="32573"
contenttype="image/png" id="img861431"
contextid="img733512" tabindex="0" style="max-width:
99.9%; user-select: none;"
src="cid:part1.EC63706B.354D83F2@tess-inc.com" class=""> </span></p>
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<p><span style="color:rgb(0,111,201)">---------------------------------------</span></p>
<p><i><span><span style="font-size:10pt;
color:rgb(0,111,201)"><b><span
style="color:rgb(0,111,201)">Doctoral Assistant,
E</span></b></span><span style="font-size:10pt;
color:rgb(0,111,201)"><b><span
style="color:rgb(0,111,201)">cole Polytechnique
Fédérale de Lausanne (EPFL), Switzerland</span></b></span></span><br>
</i></p>
<p><i><span><span style="font-size:10pt;
color:rgb(0,111,201)"><b><br>
</b></span></span></i></p>
<p><span><span style="font-size:10pt"><i><span
style="color:rgb(0,111,201)"><b><span
style="color:rgb(0,111,201)">Email:</span></b></span></i></span></span></p>
<p><span><span style="font-size:10pt"><i><span
style="color:rgb(0,111,201)"><a class="moz-txt-link-abbreviated" href="mailto:amirreza.heidari@epfl.ch">amirreza.heidari@epfl.ch</a></span></i></span></span></p>
<p><span><span style="font-size:10pt"><i><span
style="color:rgb(0,111,201)"><a class="moz-txt-link-abbreviated" href="mailto:amirrezaheidarysbu@gmail.com">amirrezaheidarysbu@gmail.com</a></span></i></span></span></p>
<p><span><span><i><br>
</i></span></span></p>
<p><span><span><span><i><span style="font-size:10pt;
color:rgb(0,111,201)"><b><span
style="color:rgb(0,111,201)">Phone: </span></b></span><span
style="font-size:10pt; color:rgb(0,111,201)">+41
21 69 57221</span></i></span><br>
</span></span></p>
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<br>
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<pre class="moz-quote-pre" wrap="">_______________________________________________
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<pre class="moz-signature" cols="72">--
***************************
David BRADLEY
Principal
Thermal Energy Systems Specialists, LLC
3 North Pinckney Street - suite 202
Madison, WI 53703 USA
P:+1.608.274.2577
<a class="moz-txt-link-abbreviated" href="mailto:d.bradley@tess-inc.com">d.bradley@tess-inc.com</a>
<a class="moz-txt-link-freetext" href="http://www.tess-inc.com">http://www.tess-inc.com</a>
<a class="moz-txt-link-freetext" href="http://www.trnsys.com">http://www.trnsys.com</a></pre>
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