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[EnergyPlus_Support] Heating and Cooling Coil Control

Hey Everybody,

So I currently have a zone which is controlled by a single air handler. The physical mechanics of the system are this:

(Economizer) -> Fan -> Heating Coil -> Cooling Coil -> Zone

Both the Heating Coil and Cooling Coil are on district plants. The system itself is a single zone CAV system.

What would be the best way to go about modeling/organizing this? 

The HVACTemplate:System:VAV does not have the ability to list the coil as anything but electric/gas (for obvious reasons) or I could list it as a reheat coil and attempt to reorganize the nodes later. My first attempt was to list it as a reheat coil then reorganize the nodes, but it led to this question.

How would I organize the controls, without using a schedule, so that the heating coil water massflow rates drop to zero when no heating is required and the chilled water mass flow rates drop to zero when no cooling is required?

I currently have a mixed air set point scheduled at the fan outlet to control the economizer (is there a better way to do this to get maximum cooling out of the economizer?) but where can I put a setpoint in the SetpointManager(and what kind) combined with the ThermostatSetpoint:DualSetpoint (which is what the HVACTemplate expands to in the expidf) to add intelligence to the control layout. Currently I have the VAV airflow % set to 100% so it is a CAV system but I need to model the coil flow like what you would get with control valves on there that shut down when they are not needed and I seem to be spinning my wheels with this particular layout.

The big problem with this building is that it is a gym so during cooling months we will always need to cool but during heating months we might need to heat and we might need to cool depending on the occupancy.



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