[buffalobillpatrick]

Yes, I like the GEA Flat Plate HX online sizing software. I have used it several times over the last 5 yrs.

I have already bought 2X of the 4-Ton coax (snake) HX's from Surplus City.
Oversized for my 2-Ton R410a Copland scroll compressor.

As I will be using Propane, in my DIY W/W heat pump, I am trying to figure out how the oversized Condenser & Evaporator will effect Subcool & Superheat?

I have a 2-Ton R22 TXV with 0-50*F Superheat adjustment.

Am trying to figure out if SLHX, IHX will help COP or not?

Most of the many website I have researched say SLHX will help some, as Propane
needs very high Superheat at Compressor inlet using POE oil (33-35*C or K, note: as this is a delta temp, C or K are interchangeable)

and more Subcool should also help as fewer bubbles will be present at TXV.
Also lower temp. refrigerant entering Evaporator will pick-up heat faster.