It seems to me that all boats are holes in the greatest and most effective heat sink on the planet - the sea. Could there not be a way to harness the temperature differential between the sea and a hot
cabin in the tropics?
Specifically, what about using a phase-change material, like a variation of Glauber's
Salt, to provide passive
cooling, as well as
heating on a
boat. Couldn't you fabricate container of the
salt, drop it in the
water at night, and put it in you
cabin when it gets hot? Conversely, for
heating, couldn't you leave it on
deck in the sun, then put it in your cabin overnight for heat release?
Products - Phase Change Materials - PCMs - PCM Energy Pvt. Ltd.