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When you say "accurately model", it sounds as though you're asking for real world validation. I don't have that. I have, however, recently compared single curve representations of VRF, such as are used by some modeling software, against the E+ "segmented" multi-curve approach. It sure looks like there are hundreds of hours in most climates (near the curve transition points) where the E+ approach matches manufacturer performance much better. In case it might be helpful, there's an upcoming webinar sponsored by DesignBuilder (which I'm helping to present) that will promote DB's capabilities for VRF but will also show some of the curve differences between E+ and single-curve approaches.