Support VRF Terminal Unit placement on air loop/OA systems

[eringold]

Enhancement Request

EnergyPlus 9.3.0 added the ability to connect a ZoneHVAC:TerminalUnit:VariableRefrigerantFlow to AirloopHVAC and AirLoopHVAC:OutdoorAirSystem:EquipmentList in NatLabRockies/EnergyPlus#7605. Request that this be added to OpenStudio.

Detailed Description

The following MCVE in v3.1.0 returns false:

require 'openstudio'
include OpenStudio::Model
m = Model.new
ahu = AirLoopHVAC.new(m)
tu = ZoneHVACTerminalUnitVariableRefrigerantFlow.new(m)
tu.addToNode(ahu.supplyOutletNode)

Possible Implementation

The EnergyPlus implementation allows for a Terminal Unit without a Fan or OutdoorAirMixer. Supply Air Fan is currently a required field:

  A8 ,  \field Supply Air Fan
        \required-field
        \type object-list
        \object-list FansCVandOnOffandVAV
        \object-list FansSystemModel
        \note Supply Air Fan Object Type must be Fan:SystemModel, Fan:OnOff, or Fan:ConstantVolume
        \note if AirConditioner:VariableRefrigerantFlow is used to model VRF outdoor unit
        \note Supply Air Fan Object Type must be Fan:SystemModel or Fan:VariableVolume if
        \note AirConditioner:VariableRefrigerantFlow:FluidTemperatureControl or
        \note AirConditioner:VariableRefrigerantFlow:FluidTemperatureControl:HR
        \note is used to model VRF outdoor unit

[jmarrec]

Duplicate of #3905

[jmarrec]

I'm going to close but add your details to #3905

[eringold]

Sorry I missed the existing issue.