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<p>Laura,</p>
<p> There are various ways that heat pumps modulate and how you
model them depends on how they modulate. Perhaps most simply some
heat pumps contain a single speed compressor that turns on and off
as required by the home. Those are best modeled by using a minute
timestep in your simulation and allowing a controller model to
switch the heat pump compressor and fan. More recently heat pumps
with variable speed compressors have entered the market. The
compressor speeds up and slows down to provide more or less
heating and cooling as needed by the building. It is a bit harder
to model these devices because it is frankly difficult to get
manufacturers to say how the compressor reacts to changing inlet
conditions. We have made some guesses about the internal control
mechanisms and have written some heat pump components that
modulate the compressor either to maintain a constant outlet
temperature or to maintain a constant inlet/outlet temperature
difference. The models do require manufacturer data but it is
usually data that can be obtained freely online. You can contact
me directly and I can explain in a bit more detail.<br>
</p>
<p>kind regards,</p>
<p> David</p>
<p><br>
</p>
<br>
<div class="moz-cite-prefix">On 09/27/2017 13:23, Laura Guillon via
TRNSYS-users wrote:<br>
</div>
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<p class="MsoNormal">Hello everyone, <o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><span lang="EN-CA">My questions are the
following : <o:p></o:p></span></p>
<ol style="margin-top:0cm" start="1" type="1">
<li class="MsoListParagraph"
style="margin-left:0cm;mso-list:l0 level1 lfo3"><span
lang="EN-CA">How to simulate a modulating air-source heat
pump with TRNSYS, in order that it provides only the
amount of heat required by the house ?
<o:p></o:p></span></li>
<li class="MsoListParagraph"
style="margin-left:0cm;mso-list:l0 level1 lfo3"><span
lang="EN-CA">Do the external files used to define the ASHP
performance represent the typical working of an ASHP ? Or
do I need to find data from manufacturers ?
<o:p></o:p></span></li>
</ol>
<p class="MsoNormal"><span lang="EN-CA"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-CA">Thank you very much for
your help! <o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-CA"><o:p> </o:p></span></p>
<p class="MsoNormal">Laura<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><b><span
style="font-size:9.0pt;font-family:"Arial",sans-serif;color:#1F497D;mso-fareast-language:FR-CA">Laura
Guillon</span></b><span
style="font-size:9.0pt;font-family:"Arial",sans-serif;color:#1F497D;mso-fareast-language:FR-CA">,
Jr. Eng M.A.Sc<o:p></o:p></span></p>
<p class="MsoNormal"><i><span
style="font-size:9.0pt;font-family:"Arial",sans-serif;color:#1F497D;mso-fareast-language:FR-CA">Project
Leader<o:p></o:p></span></i></p>
<p class="MsoNormal"><span style="mso-fareast-language:FR-CA"><br>
<b><img style="width:.7083in;height:.25in"
id="Image_x0020_1"
src="cid:part1.C1D6F8A9.2B1FDEBE@tess-inc.com"
alt="cid:image001.jpg@01CC82A8.133EEF70" class=""
height="24" width="68"></b>
<br>
</span><b><span
style="font-size:7.5pt;font-family:"Arial",sans-serif;mso-fareast-language:FR-CA">Natural
Gas Technologies Centre</span></b><span
style="font-size:7.5pt;font-family:"Arial",sans-serif;mso-fareast-language:FR-CA"><o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size:7.5pt;font-family:"Arial",sans-serif;mso-fareast-language:FR-CA">1350
Nobel, Suite 150, Boucherville, Quebec</span><span
style="mso-fareast-language:FR-CA">
</span><span
style="font-size:7.5pt;font-family:"Arial",sans-serif;mso-fareast-language:FR-CA">J4B
5H3 (Canada)</span><span style="mso-fareast-language:FR-CA">
<br>
</span><span
style="font-size:7.5pt;font-family:"Arial",sans-serif;mso-fareast-language:FR-CA"
lang="FR">Tel.: 450-641-0021</span><span
style="mso-fareast-language:FR-CA"><br>
</span><span style="mso-fareast-language:FR-CA" lang="FR"><a
href="mailto:laura.guillon@ctgn.qc.ca"
moz-do-not-send="true"><span
style="font-size:7.5pt;font-family:"Arial",sans-serif;color:blue"
lang="FR-CA">laura.guillon@ctgn.qc.ca</span></a></span><span
style="font-size:7.5pt;font-family:"Arial",sans-serif;mso-fareast-language:FR-CA"><o:p></o:p></span></p>
<p class="MsoNormal"><span style="mso-fareast-language:FR-CA"
lang="FR"><a href="http://www.ctgn.qc.ca/"
moz-do-not-send="true"><span
style="font-size:7.5pt;font-family:"Arial",sans-serif;color:blue"
lang="EN-CA">www.ctgn.qc.ca</span></a></span><span
style="font-size:7.5pt;font-family:"Arial",sans-serif;color:blue;mso-fareast-language:FR-CA"
lang="EN-CA"><o:p></o:p></span></p>
<p class="MsoNormal"><span style="mso-fareast-language:FR-CA"><o:p> </o:p></span></p>
<p class="MsoNormal"><o:p> </o:p></p>
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<pre class="moz-signature" cols="72">--
***************************
David BRADLEY
Principal
Thermal Energy Systems Specialists, LLC
22 North Carroll Street - suite 370
Madison, WI 53703 USA
P:+1.608.274.2577
F:+1.608.278.1475
<a class="moz-txt-link-abbreviated" href="mailto:d.bradley@tess-inc.com">d.bradley@tess-inc.com</a>
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