Question-and-Answer Resource for the Building Energy Modeling Community
 | 1 | initial version |
I'm assuming you mean there is an annual heating and cooling energy use difference between the VRF system and the Split AC system. Load implies a unit energy per unit time.
The differences are likely due to (1) differences in equipment COP and (2) part load curves, particularly on the VRF system.
I've noticed the default VRF curves in the OpenStudio object give high energy use values, so I altered the VRF measure to replace the default curves. The EnergyPlus example files have VRF system you can draw from.
Also make sure to model heat recovery if your VRF system has it.
| | 2 | No.2 Revision |
I'm assuming you mean there is an annual heating and cooling energy use difference between the VRF system and the Split AC system. Load implies a unit energy per unit time.
The differences are likely due to (1) differences in equipment COP and (2) part load curves, particularly on the VRF system.
I've noticed the default VRF curves in the OpenStudio object give high energy use values, so I altered the VRF measure to replace the default curves. The EnergyPlus example files have VRF system you can draw from.
Also make sure to model heat recovery if your VRF system has it.
