How much chiller you need depends on how many CUPfulls you want to run per shift/day
That gives you an upper bound on solvent requirements. Then you need to take your potency into account. Assuming you’ve read the Bucket Tek (Cold Ethanol Extraction on a Budget) thread, you know that you can run your solvent over multiple rounds of biomass (potency dependent).
Ie reduce your solvent guesstimate by 3 to 5x depending on what you plan on running.
THEN do the math on how much heat you need to remove and how fast.
Dropping 100gal by 40C in an hr requires the same size chiller as dropping 1000gal by that same 40C in 10hrs
Have you checked out the Ethanol Extraction White Paper @Photon_noir and I wrote?
That math is not in there, but should be. I’ll work on that for the next version…there’s lots of useful stuff in the current version.
Highly recommended (4 out of 5 blazed operators agree 
)