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I think you might be best off trying to model that type of heat pump
using a performance map instead of trying to model the whole
refrigeration cycle. Typically the dynamics of a refrigeration cycle
have a very very short time constant while the dynamics of a solar
collector (due to its mass) have a longer time constant. Getting a
correct first-principals model of the refrigerant evaporation and
the energy transfer within the fins and tubes of the solar collector
might be difficult. However, if you can get information about the
COP of the heat pump under different circumstances, you might be
able to mimic the way that most other heat pumps are modeled (ie
with a catalog-data lookup table approach).<br>
Kind regards,<br>
David<br>
<br>
<br>
On 3/12/2011 03:20, <a class="moz-txt-link-abbreviated" href="mailto:Enmisagh@aol.com">Enmisagh@aol.com</a> wrote:
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<div>dear all,</div>
<div>I was wondering you to give me an idea to model a direct
expansion solar assisted heat pump? In this heat pump , a flat
plate collector has the role of evaporator and refrigerant
circulates in tubes of collector . other components are
similar to conventional heat pump Is there any special type
for this application or I have to simulate every part of
refrigeration cycle separately?</div>
<div>best regad,</div>
<div> </div>
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***************************
David BRADLEY
Principal
Thermal Energy Systems Specialists, LLC
22 North Carroll Street - suite 370
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<a class="moz-txt-link-abbreviated" href="mailto:d.bradley@tess-inc.com">d.bradley@tess-inc.com</a>
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