On Sat, 10 Sep 2011 01:24:45 -0500, Richard
wrote:

I've asked a few people about this personally, but I'd like to throw it
open to the larger group as well.

I'm trying to cool the boat for a few days at a time...

A normal 5000 BUT marine air conditioner can pull up to 30 amps of 12
volt power. If my house battery were new and fully charged, that's 4 or
5 hours. That won't get it for even for a weekend.

If we had a diesel engine (and ran it all day) we could use an
automotive approach. But we don't - and can't.

So, quoting Kelly Johnston (one of my favorite heroes),
"Simplicate, and add lightness".

Statement of Problem:
I want to air condition the boat for up to 3 or maybe 4 days at a time.
Independent of dock power.
With as low of a battery load as possible.

Proposed Solution:

A cooler type container with a load of dry ice and a way to move large
amounts of air across the cooler.

A sketch at:
http://www.home.earthlink.net/~cave-1/images/ac-3.jpg

I'm already thinking glycol for the fluid.

But what to make the rest of it from?
Cheap, off the shelf stuff preferred!
A pump that can handle antifreeze?
High torque low power 12 volt DC motors?
What to use for the heat exchangers?
Coils of tubing? Or auto parts?


Other than a drip pan (and a handful of brain cells),
what am I missing?


Thanks all,


Richard

Humidity too high for a swamp cooler?


--
"The danger to America is not Barack Obama but a citizenry
capable of entrusting a man like him with the Presidency.
It will be far easier to limit and undo the follies of an
Obama presidency than to restore the necessary common sense
and good judgment to a depraved electorate willing to have
such a man for their? president.. Blaming the prince of the
fools should not blind anyone to the vast confederacy of
fools that made him their prince".