[EnergyPlus_Support] Zone components of a 2-pipe system?

["anarui.oliveira" <anarui.oliveira@xxxxxxxxx>]

Hello, all.

I'm having a hard time to figure out the best options to model a 
specific 2-pipe HVAC configuration...

Any ideas about which could be the simplest way to approximate the 
zone level model of a 2-pipe (constant volume) system with:
- an AHU that delivers 100% OA at inermediate heated/cooled 
temperatures (18/27 ºC) to the zone level,
- where a battery with either hot or chilled water coil (mutually 
exclusive at any given moment, and necessarily in the same operation 
regime - heating or cooling - serving the central AHU) meets the 
additional load (when needed),
- raising/decreasing the air temperature of the supply air loop to 
design Temperatures of 35ºC(heating) or 16ºC (cooling), to meet Room 
Air setpoint conditions according to a 20-25ºC thermostat?

The "Single Duct:Const Volume: Reheat" and "Single Duct:Const Volume:4 
pipe" don't quite seem to reproduce this behaviour?...

No recirculating or induced air from the room actually happens in the 
real situation (the zone level re-conditioning is performed directly 
and uniquely in the air supplied by the AHU, and then delivered to the 
room, where the mixed model should take care of the rest)...
....but perhaps, in terms of global thermal loads and energetic 
analysis, it wouldn't be too far fetched to use
- "Single Duct:Const Volume:4 pipe"
or
- "direct air" and "fan coil: 4 pipe"
with mutually exclusive availability schedules for the coils and 
design air inlet temperatures equal to the setpoints of AHU supply 
air?...
.... the main differences between these options being?...

Better options?...

Thanks in advance,
Ana Rui.



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