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Go Back   SailNet Community > General Interest > General Discussion (sailing related) > No A/C when motoring?
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Thread: No A/C when motoring? Reply to Thread
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Topic Review (Newest First)
08-03-2012 04:31 PM
deniseO30
Re: No A/C when motoring?

Quote:
Originally Posted by Armchair Sailor View Post
Interesting. Maybe drop a silver coin in the water reservoir then. And be sure to never let the water be stale. For example always run the cooler to exhaustion of water. I think that should be sufficient to drastically reduce the chance of the disease.
AS, good but the media, (usually wood) will still get nasty. hvac suppliers sell tablets to treat the water.
08-03-2012 02:04 PM
Armchair Sailor
Re: No A/C when motoring?

Quote:
Originally Posted by deniseO30 View Post
Legionnaire's Disease became infamous in Phila PA in that type of equipment. "swamp cooling" coolers are essentially a "water tower" with wooden slats that water is recirculated over. as air by fan or gravity moves over them. The wood and reservoir will get nasty.. real nasty.
Interesting. Maybe drop a silver coin in the water reservoir then. And be sure to never let the water be stale. For example always run the cooler to exhaustion of water. I think that should be sufficient to drastically reduce the chance of the disease.
08-03-2012 12:50 AM
Brewgyver
Re: No A/C when motoring?

Well, 40 pounds of ice (two bags), 144 btu/lb, over five hours, 1,152 btus/hr, or about one fifth the cooling provided by a small window unit or portable A/C. Cheap to build, yes, certainly. Operating cost? Another story.
08-03-2012 12:03 AM
travlineasy
Re: No A/C when motoring?

One of the many videos I watched said two bags of ice in a well insulated cooler chest will last about 5 hours. The cooling effect, obviously, will depend upon the cubic feet of space you intend to cool, humidity level, etc.. Lots of factors to contend with. I'll begin working on my cooler-chest air conditioner next week and provide you with the results. My office is about the same size as the interior of my Morgan 33 Out Island. If it makes a big difference here, it will likely have a positive impact on the boat's cabin temperature.

Cheers,

Gary
08-02-2012 11:30 PM
Brewgyver
Re: No A/C when motoring?

Cooling by ice is a dead end. Mechanical cooling capacity is measured in tons, from the days when ice was used for large cold storage, etc, and the "ton" is the btu equivalent of the cooling provided by a ton of ice melting over a 23 hour period. 12,000 btus/hr = 1 ton of cooling. A typical window A/C unit runs from 0.5 to 1.5 tons. So, to provide the equivalent of a smallish window unit, you would go through just shy of 42 pounds per hour.
08-02-2012 01:33 PM
deniseO30
Re: No A/C when motoring?

Legionnaire's Disease became infamous in Phila PA in that type of equipment. "swamp cooling" coolers are essentially a "water tower" with wooden slats that water is recirculated over. as air by fan or gravity moves over them. The wood and reservoir will get nasty.. real nasty.
08-02-2012 03:55 AM
Armchair Sailor
Re: No A/C when motoring?

"Swamp coolers" work best in hot but arid climates. I am afraid that Maryland in the summer won't qualify...

If the humidity of the air is already 100%, the water won't evaporate in the cooler, so no cooling effect.
08-01-2012 11:21 PM
mikel1
Re: No A/C when motoring?

"Cooler" air conditioner video is interesting . . . like the concept, wonder how long the ice lasts . . .
08-01-2012 10:35 PM
LinekinBayCD
Re: No A/C when motoring?

Quote:
Originally Posted by NickPapagiorgio View Post
Hi everyone,

I don't own a boat (yet), but we've done a fair amount of chartering on the Nothern Chesapeake Bay. Our last trip was July 6-8 during the extreme heat. The high temperature was well over 100 degrees and the wind was constantly at our back (when there was wind).

Usually, it's fairly comfortable down below when under way becuase the air temps are usually lower on the water and there's generally a pretty good breeze. On this trip however, it was just unbearable.

We had my 2-year-old son with us and it was way too hot for him to take a nap down below, so he ended up being pretty miserable for most of the trip.

Anyway, I was wondering why you can't use the engine to power the A/C like in a car. The boat we had out was a Catalina 350, but as far as I know, most, if not all, sailboats are set up so that the A/C is only operational if plugged into shore power or if you have an onboard generator. Anyone know why? Also, how hard would it be, or is it even possible, to rig something up to allow the A/C to run while the engine is on?

Thanks,

Kevin
Like you we did a lot of chartering on the Chesapeake when the kids were little. My fix wasn't the AC. I started chartering in Maine.
08-01-2012 10:19 PM
travlineasy
Re: No A/C when motoring?

Back on topic - I've spent much of the evening looking at videos on YouTube of Swamp Coolers, some of which are very ingenious. Essentially, they are all nothing more than mid-size cooler chests filled with ice with a small fan motor mounted mounted at one end on the lid, and an exhaust port at the other end. Some baffle plates inside would make them far more efficient by making the air travel over greater distances before exiting the cooler chest, but overall, they seem to work quite well and consume very little power in the process--especially those utilizing compute fans. Before heading to the sunny south for winter I intend to construct one, maybe as soon as next week. Should be fun, and if it works in Maryland's oppressive heat and humidity, it will work anywhere on the planet.

Here's one you may wish to look at:

Cheers,

Gary
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