This is the correct way to plot the boundary curve using the CAPFT results. However, the model still expects ODB as a function of IWB.
The high ODB temperature curves would be used when the ODB temperature is on the right side of the boundary curve. You would create a performance curve for the right side of the figure just as you did on the left side. The points between the low and high regions is the boundary curve you created in 1. above.
If specific performance aspects of VRF are not available you can used the data in the example file. Piping correction is not a large part of the answer but should still be included using your best judgment. Part-load performance is a large part of the answer yet using a curve similar to the example file is not that bad of an assumption. See this document for a description of how to create all the VRF performance curves.
