Calculation of Steam Required

That would depend upon the vacuum level in the dryer, the minimum acceptable moisture level, the maximum temperature in the dryer, the quality of the steam and a whole host of other things.

Engage one or several dryer vendors in a pilot-scale trial. Most dryer vendors are happy to participate, because as well as the prospect of a sale, the vendor will both bring recent application knowledge gained from elsewhere to the party and glean application knowledge from it that can be taken to the next one.

You mean to say that you want to dry solids with 50% moisture content with steam at 16 bar? What is the solid (wood/Tobacco/bagasse/rice/wet leather etc)? what is the quantity kg/hr? what is the specific heat of the solid? waht temperature wet in? what temperature dry out? what % m.c in the solid at exit?