Question-and-Answer Resource for the Building Energy Modeling Community
 | 1 | initial version |
There are always many ways to skin a cat when it comes to modeling one particular system with templates.
Let's just try and understand what this "ductless split HVAC system" mean.
You have an outdoor unit, also called condenser unit, with a condenser and a compressor.
You have an indoor unit, with the evaporator and a fan (air-handler).
In between, refrigerant is piped.
(The expansion valve's typical location on a split (non multi-split/VRF) would be in the outdoor unit)
You have no ducts, so your indoor unit will condition the room it's installed in.
What they mean by "ducted" system is when the indoor air-handler is a proper Air handling unit that will deliver air to multiple rooms.
What you need to model this system:
So, in EnergyPlus, you could use HVACTemplate:System:UnitarySystem for the greatest flexibility.
In OpenStudio, you could create an empty air loop, and add a DX Cooling coil (and a DX Heating coil if it's a heat pump), and the appropriate controllers.
But, your system has the the same components as a Packaged Terminal Heat Pump (PTHP) (E+: HVACTemplate:Zone:PTHP), and that's built into OpenStudio.
This is a zonal system, you add it on the "Thermal Zones" pane of OpenStudio, and you can't (as of 1.6.0) modify it graphically like the other systems but you'll get a pane to change it its components.
The PTHP template comes with a supplemental (backup) electric heating coil and an outdoor air mixer... Both of which you'll want to modify.
