[EnergyPlus_Support] Re: Many coils in one AHU

["Jean marais" <jeannieboef@xxxxxxxxx>]

It seems like you want to take the heat in the condenser loop of the cooling dx and use it in you heating dx (reheater) circuit, and in fact the condenser loop is the circuit for the heating coil (one compressor in the machine). I honestly don't know how to model this.Does e+ have such a model?

 Perhaps you could model the dx cooling as is and then model a dummy water coil with a dummy hot water plant. Then use EMS to change the fluid entering temperature of the heating coil to equal that of the exit dx cooling coil compressor, then use EMS to override the entering expansion valve temp from that of the exiting htg coil fluid temp.

That is provided the EMS can grab into the dx unit.

Jean



--- In EnergyPlus_Support@xxxxxxxxxxxxxxx, "FrancescoP" <fpasserini.tn@...> wrote:
>
> A problematic issue is that the DX cooling coil and the DX heating coil are part of the same refrigerant circuit. The goal of the system is the dehumidification. I would like to impose the condition:
> 
> heat provided by the DX heating coil =  heat subtracted by the cooling coil + work of the compressor
> 
> Is it possible? Or does a better way to model such a system exist? E.g., does a method exist to model explicitly a refrigerant circuit within an AHU?
> 
> If it is impossible, I would like to impose at least the following conditions:
> 
> 1.  IF  the DX cooling coil works  THEN  the DX heating coil works
> 
> 2.  IF  the DX heating coil works  THEN  the DX cooling coil works
> 
> And then I would adjust the COP values.
> 
> Any suggestion, please?
> 
> Regards
> Francesco
> 
> 
> 
> --- In EnergyPlus_Support@xxxxxxxxxxxxxxx, "FrancescoP" <direzionecontraria@> wrote:
> >
> > Hello,
> > I have to model a dehumidification system (an AHU without outdoor air, only recirculation) in which there are a water cooling coil, a DX cooling coil, a DX heating coil, and another water cooling coil. 
> > I begin to model in DesignBuilder, then I export the .idf file in EnergyPlus. As you can read at the following link, modeling such a system directly in DesignBuilder isn't possible:
> > http://www.designbuilder.co.uk/index.php?option=com_forum&Itemid=1&page=viewtopic&p=12704#12704
> > What is the best way, in your opinion?
> > In DesignBuilder shall I begin with an Unitary heat pump or with a Generic Air loop?
> > Best Regards
> >
>




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