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Thank you David !<br>
<br>
Then idea to connect outside air to electric air heater and control
it by an equation sounds reasonable. <br>
<br>
All the best,<br>
Michal<br>
<br>
<br>
<div class="moz-cite-prefix">On 2015-05-21 16:02, David BRADLEY
wrote:<br>
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<blockquote cite="mid:555DE572.8050701@tess-inc.com" type="cite">
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Michał,<br>
Type938 does not take a defrosting cycle into account because
the sequence of controls used to run a defrost cycle change from
one manufacturer to another. You can create your own defrost
cycle, however by using a thermostat model to watch the outdoor
unit outlet temperature and turn the heat pump on in cooling mode
for a period if the outlet air temperature falls too far.
Depenging on how the defrost cycle works in your case you can also
use some other components if an electric heater runs to keep the
supply air warm during that cycle.<br>
<br>
As a side note, please remember that Type938 (and all the
components that read performance data from an external data file)
can interpolate performance data within the range given in the
file but cannot extrapolate beyond the range. If you expect to run
your heat pump in a climate where defrost will be needed please
also make sure that both the heating and cooling data files
contain capacity and input power information for temperatures that
low.<br>
kind regards,<br>
David<br>
<br>
<br>
<div class="moz-cite-prefix">On 5/20/2015 8:30 AM, Michał Klimas
wrote:<br>
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<p class="MsoNormal">Dear All,<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><span lang="EN-US">I’m trying to simulate
the behavior of air source heat pump during a year. <o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">Does anyone know how
to take into account <b>defrosting cycle</b> (reverse
mode of heat pump) during winter time ?<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">kind regards<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">Michal Klimas<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">Poznan University of
Technology<o:p></o:p></span></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
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