JJW's comments:

16 sq.m SPDU (Drg Ref: 21-12-86-01, Rev 2) - Approved

20 sq.m SPDU (Drg Ref: 21-12-86-02, Rev 2) - See below comments 

All looks good except that I have one concern regarding the Condenser bonnet design. It seems that the annular bonnet looks” small” compared to the size of the outlet Nozzle, N12.  It looks like the annular radius is about 4” and the inlet nozzle ID is 6” or so. Will this design result in an uneven flow in the tubes nearest N12 as opposed to those 180 degrees away from N12?  Without getting too theoretical here, I have the following question:

Is this design similar to the design of the 20 m2 units that were shipped to Heartland via LCI and PESCO in 2008?

If so, I would say that this is a proven design and there is no need to go any further.

Ask TF to forward a copy of the drawing from the above mentioned 20m2 evaporators from 2008 
