I am just curious. There are a lot of exchanges on VRF with DOAS for OpenStudio/EnergyPlus here. I have spent some time with that subject myself, including trying to use the VRF with DOAS measure. To this day, I have not been able to demonstrate the commonly alleged advantage of a VRF with DOAS system over a RTU system. This includes using the default OpenStudio VRF selection and the LG components, as well as homegrown Daikin components (based on Daikin's Trace-700 library).
In fact, I am having to fall back on Trace-700 - and its Daikin library - every time I have to do a LEED project, which is frustrating, given that OpenStudio/EnergyPlus ought to be eminently capable of handling this seemingly simple task? I have gotten some comments on earlier questions I posed, but not really actionable guidance.
Has anyone at all gotten VRF with DOAS to work under OpenStudio/EnergyPlus while seeing BOTH a roughly 25% reduction in demand and usage AND acceptable unmet hours (< 300 hours/year)? If so, would you be willing to share your model, so I could learn from it? I know there is a large number of Vulcan death grips possible in VRF with DOAS, and it is quite likely I am not applying them in the right combination (though I think I have been through a good number - if not all - of them). Thanks!
