Hetp for copper mesh

[EricTheRed]

Been reading and reading and reading. Can't find a definitive answer.

I have a mixed diameter column setup.

2" x 90 cm with 70cm of tightly packed copper
The a 20cm open air gap during which it scales up to 3"
Then 60 cm of tightly packed copper mesh bore it scales back to 2" and a crossflow reflux condenser.

This setup will produce 94.5% at 1.25 lph

Question is, what is the hetp of this?
Can't find a calculator for this.