Hi,
I need to build and install a packaged AC unit into a very confined location on a vehicle. Previously the vehicle had two Tricool packaged AC's and I need to replace these, as these are old R22 and very corroded units. Me and the owners reached the conclusion we have to build from scratch two custom units that can fit exactly in the original location. These units needs to have the air inlets and outlets in the same location as the old units.

My main problem is I need to find condensers and evaporators of the same physical sizes.
For example, I need to calculate how many rows, fin density and pipe dimension for a 24000BTU condenser. The old R22 condenser was 580x310mm for finned area, 2.5mm fin pitch, 5 pipe rows and 10mm pipe O.D.

I'm not asking for someone to calculate this, I'd like to know if there's an easy or practical method for me to calculate a new condenser for, let's say, R32 refrigerant I intend to use.
Thanks!