Wouldn’t (wooden) it be CHEAPER just to have a REAL hull?
Instead of a refrigeration system; fuel to run it,
men to maintain it,
a backup in case it FAILED and
all of those TUBES with refrigerant instead of
a relitively thin pice of steel?
There is usually a REASON things are built they way they are; and it is called ECONOMICs.
Imagine a steel hull ship built like a huge slab that is say figuratively three times larger than any of the worlds larget supertankers.
A one mile long vessel, this ship never leaves waters much warmer than 40F, it will never be in the tropics. Ammonia refrigeration through solar or wind power would be supplemental but not required, and any time some melting did occur the vessel needs to only travel in colder waters to build its hull back up.
The idea was about creating torpedo proof aircraft carriers during WW2 originally.