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<p>Hüseyin</p>
<p> This may seem very basic but make sure that you have turned off
the automatic heating and cooling in TRNBuild so that the
temperature of your zone is floating. You can verify this by
running your simulation; the zone temperature should more or less
follow the ambient temperature. You will then implement a
thermostat to watch the zone temperature and turn on/off the heat
pump accordingly. <br>
</p>
<p> If that is what you are doing already and the power and
capacity of the heat pump is not changing at all then it must mean
that neither the return air temperature nor the water inlet
temperature is changing at all. It could also mean that the return
air temperature and inlet water temperature are outside the range
of data values given in the data file. The routine that reads the
data file and interpolate within the range but cannot extrapolate
beyond the range given.</p>
<p>kind regards,</p>
<p> David</p>
<p><br>
</p>
<div class="moz-cite-prefix">On 03/27/2020 09:29, Hüseyin Günhan
Özcan wrote:<br>
</div>
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<div class="WordSection1">
<p class="MsoNormal"><span
style="font-size:11.0pt;mso-fareast-language:EN-US"
lang="EN-US">Dear all,<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;mso-fareast-language:EN-US"
lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;mso-fareast-language:EN-US"
lang="EN-US">I have a similar question about modeling air
source heat pump.
<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;mso-fareast-language:EN-US"
lang="EN-US">In my case I am working the model inverter heat
pump so I selected the multi stage heat pump (Type 922c).<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;mso-fareast-language:EN-US"
lang="EN-US">Meanwhile, I connected its return temperature
value to the Type 56 indoor temperature (I am following a
single room) and I also use Type 15-6 for outdoor
conditions. Although I make some changes in the building
file (internal heat gain, regimes, etc.) and weather data
the model shows always the same values.<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;mso-fareast-language:EN-US"
lang="EN-US">Therefore, I realized that it only works based
on external catalogue values. But, it does not make sense.
Do you have an idea about this case ? How can type 922c
operates based on temperature variations belongs to the
building.<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;mso-fareast-language:EN-US"
lang="EN-US">Another question is how can I change the
catalogue values ? (I have no problem in proforma including
parameter, input and output parts).<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;mso-fareast-language:EN-US"
lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;mso-fareast-language:EN-US"
lang="EN-US">Thanks in advance.<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;mso-fareast-language:EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><b><span style="font-size:11.0pt">Huseyin
Gunhan Ozcan<o:p></o:p></span></b></p>
<p class="MsoNormal"><b><span style="font-size:11.0pt">Visiting
Researcher<o:p></o:p></span></b></p>
<p class="MsoNormal"><b><span style="font-size:11.0pt">Porto
Uni., Dept. of Mech. Eng.<o:p></o:p></span></b></p>
<p class="MsoNormal"><b><span style="font-size:11.0pt"><o:p> </o:p></span></b></p>
<p class="MsoNormal"><b><span
style="font-size:11.0pt;font-family:"Yu
Gothic",sans-serif"><img
style="width:1.6979in;height:.677in"
id="Picture_x0020_1"
src="cid:part1.3FC597C1.F5A9965E@tess-inc.com"
alt="Adsız" class="" width="163" height="65"><o:p></o:p></span></b></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;mso-fareast-language:EN-US"><o:p> </o:p></span></p>
<div>
<div style="border:none;border-top:solid #E1E1E1
1.0pt;padding:3.0pt 0cm 0cm 0cm">
<p class="MsoNormal"><b><span
style="font-size:11.0pt;font-family:"Calibri",sans-serif"
lang="EN-US">From:</span></b><span
style="font-size:11.0pt;font-family:"Calibri",sans-serif"
lang="EN-US"> TRNSYS-users
<a class="moz-txt-link-rfc2396E" href="mailto:trnsys-users-bounces@lists.onebuilding.org"><trnsys-users-bounces@lists.onebuilding.org></a>
<b>On Behalf Of </b>David BRADLEY via TRNSYS-users<br>
<b>Sent:</b> Friday, March 27, 2020 1:45 PM<br>
<b>To:</b> TRNSYS users mailing list at OneBuilding.org
<a class="moz-txt-link-rfc2396E" href="mailto:trnsys-users@lists.onebuilding.org"><trnsys-users@lists.onebuilding.org></a><br>
<b>Cc:</b> David BRADLEY <a class="moz-txt-link-rfc2396E" href="mailto:d.bradley@tess-inc.com"><d.bradley@tess-inc.com></a>;
Muhammad Zeeshan <a class="moz-txt-link-rfc2396E" href="mailto:zeeshanmuhammad922@gmail.com"><zeeshanmuhammad922@gmail.com></a><br>
<b>Subject:</b> Re: [TRNSYS-users] Type 941(Air to water
heat pump)<o:p></o:p></span></p>
</div>
</div>
<p class="MsoNormal"><o:p> </o:p></p>
<p>Muhammad,<o:p></o:p></p>
<p> Please refer to the Type941 documentation. It explains how
the external files and the parameters relate to each other to
compute the overall capacity and power consumption of the heat
pump.
<o:p></o:p></p>
<p> The evaporator does not really need to be designed more
than to choose a machine with an appropriate rated capacity.
Traditionally that might mean adding a safety factor to the
peak cooling load (10% is often used) and then selecting a
machine that will meet that capacity. Also bear in mind that
Type941 models a single speed (ie single capacity) heat pump
that is either on or off. Depending on how variable the load
in your building it, you might want to meet that load with
multiple smaller heat pumps rather than one big one.<o:p></o:p></p>
<p>kind regards,<o:p></o:p></p>
<p> David<o:p></o:p></p>
<p><o:p> </o:p></p>
<div>
<p class="MsoNormal">On 03/27/2020 08:02, Muhammad Zeeshan via
TRNSYS-users wrote:<o:p></o:p></p>
</div>
<blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">
<div>
<p class="MsoNormal">Hello Everyone, <o:p></o:p></p>
<div>
<p class="MsoNormal"> <o:p></o:p></p>
</div>
<div>
<p class="MsoNormal"> I am
working on cooling a building with type 41(air to water
source heat pump). The cooling load of the building is
25 tons. I want to know<o:p></o:p></p>
</div>
<div>
<p class="MsoNormal"><o:p> </o:p></p>
</div>
<div>
<p class="MsoNormal">1)- how the compressor power will be
calculated? as the external files of type 941 contains
fractions of compressor power which shows no link to the
equations provided in manual. How to link the external
file with the provided equations?<o:p></o:p></p>
</div>
<div>
<p class="MsoNormal"><o:p> </o:p></p>
</div>
<div>
<p class="MsoNormal">2)-As the cooling load of the
building is 25 tons, how to design the evaporator for
this building load?<o:p></o:p></p>
</div>
<div>
<p class="MsoNormal"><o:p> </o:p></p>
</div>
<div>
<p class="MsoNormal">Your help in this regard will be
highly appreciated.<o:p></o:p></p>
</div>
<div>
<p class="MsoNormal"><o:p> </o:p></p>
</div>
<div>
<p class="MsoNormal"><o:p> </o:p></p>
</div>
<div>
<p class="MsoNormal"><o:p> </o:p></p>
</div>
<div>
<p class="MsoNormal">Regards,<o:p></o:p></p>
</div>
<div>
<p class="MsoNormal">Muhammad Zeeshan<o:p></o:p></p>
</div>
</div>
<p class="MsoNormal"><br>
<br>
<o:p></o:p></p>
<pre>_______________________________________________<o:p></o:p></pre>
<pre>TRNSYS-users mailing list<o:p></o:p></pre>
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<pre>-- <o:p></o:p></pre>
<pre>***************************<o:p></o:p></pre>
<pre>David BRADLEY<o:p></o:p></pre>
<pre>Principal<o:p></o:p></pre>
<pre>Thermal Energy Systems Specialists, LLC<o:p></o:p></pre>
<pre>3 North Pinckney Street - suite 202<o:p></o:p></pre>
<pre>Madison, WI 53703 USA<o:p></o:p></pre>
<pre><o:p> </o:p></pre>
<pre>P:+1.608.274.2577<o:p></o:p></pre>
<pre>F:+1.608.278.1475<o:p></o:p></pre>
<pre><a href="mailto:d.bradley@tess-inc.com" moz-do-not-send="true">d.bradley@tess-inc.com</a><o:p></o:p></pre>
<pre><o:p> </o:p></pre>
<pre><a href="http://www.tess-inc.com" moz-do-not-send="true">http://www.tess-inc.com</a><o:p></o:p></pre>
<pre><a href="http://www.trnsys.com" moz-do-not-send="true">http://www.trnsys.com</a><o:p></o:p></pre>
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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
F:+1.608.278.1475
<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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