Reward for lost Kraken!
Join Date: Apr 2006
Thanked 137 Times in 134 Posts
Rep Power: 11
Sucking in cold water and pumping it through small tubing is a nice theory. Except, you need to strain the inlet, filter it, keep the critters from growing inside the lines, keep powering the pump and fans....In practical terms you could put a lot of time and money into the experiment and see it pack up solid after a month or two, if it worked well at all.
I'd second the motion for a 5000 btu "carrycool" type air conditioner, and just pay for the use of the AC at the dock. Make up a hatchboard that secures the AC unit in the companionway hatch and you'll be in business. Those units are outright CHEAP.