Hi Bldg-Sim Group,

I am working on variable refrigerant flow (VRF) system modeling using
EnergyPlus to understand energy savings compared to other conventional
systems.

For VRF modeling, I utilized the example file
"VariableRefrigerantFlow_5Zone.idf". This example uses outdoor air mixer in
each VRF indoor unit for the supply air which goes through cooling and
heating coil to the zone inlet node.

But, a typical VRF system practice uses a separate DOAS system to reduce
cooling and heating load in the VRF side only recirculating return air to
be conditioned.

I am trying to add DOAS in the VRF modeling. The problem is that
HVACTemplate:DOAS (in EnergyPlus 7.2 or 8) does not support this.

Is there anybody who did VRF system modeling with adding DOAS?

Thank you!

Sang Hoon Lee