[Bldg-sim] EnergyPlus VRF + DOAS modeling

Jason Kirkpatrick jason.alan.kirkpatrick at gmail.com
Mon Jun 3 17:44:16 PDT 2013

Sang Hoon,

The point of the HVACTemplate files is to demonstrate how the nodes and
branches are configured.
Using the DOAS and a zonal system template will show you how to configure a
system with a ventilation system and separate zonal cooling / heating

I suggest using the HVACTemplates for DOAS and WaterToAirHeatPump to create
the node connections. Upon running, this will create a file '.expidf' which
is the HVACTemplates expanded out to full .idf.
You can rename this file to be extension .idf and edit it like a normal

Modify this renamed expanded HVACTemplate file, remove the zonal
WaterToAirHeatPump objects and replace them with the VRF terminals
following the example you are using.

Hope this helps,


On Mon, Jun 3, 2013 at 12:08 PM, Lee, Sang Hoon <hi.sanghoon at gmail.com>wrote:

> 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, Post-doc
> Building Technology
> College of Architecture
> Georgia Institute of Technology
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