Re: [TRNSYS-users] direct expansion solar assisted heat pump

[David BRADLEY <d.bradley@tess-inc.com>]

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).
Kind regards,
 David


On 3/12/2011 03:20, Enmisagh@aol.com wrote:

dear all,

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?

best regad,

 

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