Re: [EnergyPlus_Support] LOW TEMP RADIANT SYSTEM:HYDRONIC in combination with purchased air object

[Rick Strand <rkstrand@xxxxxxxx>]

Arno:

The situation you describe cannot exactly be modeled in EnergyPlus.  What 
can be done is to have both the radiant system and the purchased air system 
turn on at 23C with the radiant system taking priority over the purchased 
air system.  Unfortunately, any load not met by the radiant system will be 
met by the purchased air system, even if the temperature is not yet above 26C.

Currently, we are looking at the possibility of changing the radiant system 
controls.  The biggest change being considered is the decoupling of the 
radiant system from the thermostat controls used for conventional forced 
air systems.  If such changes are implemented, then you would be able to 
achieve the control that you described in your email.  This is something 
that the development team will discuss and prioritize for work in the near 
future.

Thanks,

Rick Strand
EnergyPlus Development Team


At 01:58 AM 2/14/2007, you wrote:


>Hello.
>
>Is it possible to combine/control a LOW TEMP RADIANT SYSTEM:HYDRONIC
>with a purchased air (cooling) object in this manner:
>
>1. start cooling with low temp radiant system above 23 °C (MAT)
>2. start (second) cooling with the purchased air object if the room 
>temperature is above 26 °C
>
>At the moment both objects starts if the room temperature of the ZONE 
>CONTROL:THERMOSTATIC is
>above the setpoint.
>
>Ideas are welcome.
>
>Regards, Arno


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