So, I tried the VRF & DOAS measure from BCL in OpenStudio 2.4. I have a few questions.
1) Where in the EnergyPlus output, can I find the VRF outdoor unit capacity (similar to an RTU capacity)? Is the only way to get these to add some VRF-related output variables to the OpenStudio 2.4 reports section and then look at design day numbers in DView or ResultsViewer?
2) On the DOAS side of things, i.e. the "traditional" air loop, rather than the VRF structure, each zone has a field "Account for Dedicated Outdoor Air System", which appears to be set to "No" by default. But since VRF and DOAS do not "communicate" with each other shouldn't this be set to "Yes", so that the outdoor air coming into the zone is viewed as a (mild) load on the VRF terminal for that zone? The effect may be small if the OA is space neutral, but depending on what the various zones are doing, I could imagine OA temperature being off from zone set point by a few degrees?
3) I am doing a ASHRAE 90.102997 Appendix G analysis, requiring to compare a "System 6" (RTUs with PFPB) to a VRF & DOAS system. I always thought that the latter is much more efficient than the former, but I get much more annual cooling and heating energy for VRF & DOAS than for RTU & PFPB. Something is amiss, I am sure. Anyone seen this before?
