Question-and-Answer Resource for the Building Energy Modeling Community
 | 1 | initial version |
The measure labeled 'VRF + DOAS' in BCL has high static pressure on the zone terminal units and some odd curves for main VRF condenser.
Try the VRF+DOAS system option in this measure. This should have acceptable unmet hours in all climates except very cold climates (ASHRAE CZ 7+), as the default system and curve set isn't set up to handle very cold outdoor air temperatures without a backup heating system.
VRF systems have improved rapidly in the last few years, and we need to update our curves, especially for low-temperature operation. No matter which VRF measure you select on BCL, I would recommend updating the VRF condenser curves to match the specific product you are using in your project.
