This is what I found on a different thread previously. (8) 1/2 BBL kegs, (20) 1/6 BBL kegs, ((16) 1/4 BBL?) on a 40x48 pallet assuming they are double stacked.
I am figuring my cold storage assuming (4) per pallet, and stacked (3) kegs high using a small pallet stacker. Assuming (3) kegs high, that would be 12 kegs in about 13.3 sqft in a 10' tall cold room. Note that you will also need to include space between the stacks to get a pallet stacker in there.
I hope this helps.
Brandon Besser, P.E.
"He that breaks a thing to find out what it is has left the path of wisdom" - Gandalf