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[EnergyPlus_Support] Re: Cooling Coil (Water) - Controls

Did you try using Setpoint Managers / SetpointManager:Scheduled:DualSetpoint? BTW I could not find the idf file ("ConstantVolumeSystem_092409.idf") in the file link.

Dave


 EnergyPlus_Support@xxxxxxxxxxxxxxx, "tobias.leibing" <tobias.leibing@...> wrote:
>
> Hello there,
> 
> I have a question regarding the controls of water-based cooling coil.
> 
> I'm trying to model the as-is condition of a building, I have a runaround system with first the fan (constant volume), then a heating coil (electric) and afterwards the cooling coil (water).  Right now the setpoint for the cooling coil is set to 12degC on the outlet node of the coil, air-side. The actuator node is on the inlet node of the coil, water-side.
> Right now the system is cooling the zone throughout the whole year (location: Washington, DC; cooling setpoint is 24/26degC).
> 
> Since the situation in the building is that the actual control for the zone air temperature is done via a thermostat within the zone for both cooling and heating.
> So how can I implement this into my model?
> 
> Besides, the heating coil only works if I either use an availability schedule to clearly turn on/off cooling and heating coil separately or or if I increase the ACR to a very high value of about 15ACH for the zone.
> 
> Could it be, that I might need a VAV-system instead of the constant volume to be able to control the zone air temperature properly?
> 
> I've uploaded the idf-file in the file-section of this group ("ConstantVolumeSystem_092409.idf")
> 
> 
> Thanks for your help,
> 
> Tobias
>




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