No A/C when motoring? - Page 4 - SailNet Community
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post #31 of 35 Old 08-02-2012
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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.
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post #32 of 35 Old 08-02-2012
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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.

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post #33 of 35 Old 08-02-2012
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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.

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post #34 of 35 Old 08-03-2012
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Smile 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.
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post #35 of 35 Old 08-03-2012
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Re: No A/C when motoring?

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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.

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