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Old 23-03-2016, 21:56   #1
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Question "Eutectic" A/C - eg. Frozen Water - possible?

I have solar panels, once the batteries are full it dumps excess energy into running my Freezer/Refrigerator...

If I freeze a eutectic solution (eg. Arctic Ice, that blue stuff you put in a cooler), and the make an "ice box with a fan" type contraption...

Would that be a good A/C system? I have no idea how many BTU's are stored in those blue cooler things but maybe it will help some?
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Old 23-03-2016, 23:09   #2
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Re: "Eutectic" A/C - eg. Frozen Water - possible?

It would work but you would be better off adding batteries to take the extra power potential and run a 12 volt swamp cooler off it.
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Old 25-03-2016, 16:29   #3
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Re: "Eutectic" A/C - eg. Frozen Water - possible?

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It would work but you would be better off adding batteries to take the extra power potential and run a 12 volt swamp cooler off it.
Huh I never thought about that. I suppose I could put cold packs inside anyways if I needed extra cold.

Would a swamp cooler work running directly from the sea water? Our waters are around 55 degrees year round...
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Old 25-03-2016, 16:41   #4
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Re: "Eutectic" A/C - eg. Frozen Water - possible?

The last thing on my mind when the water is 55 is cooling the boat more!!

But the most effective way to harness the cold water would be run a pump from the sea through a radiator and blow air over it.


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Old 25-03-2016, 18:49   #5
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Re: "Eutectic" A/C - eg. Frozen Water - possible?

What sailmonkey said to do is just a closed swamp cooler so not adding any moisture to the boats interior. In august the waters under my keel in port orchard are rarely over 60f even with an air temp well over 80f.
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Old 26-03-2016, 07:52   #6
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Re: "Eutectic" A/C - eg. Frozen Water - possible?

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What sailmonkey said to do is just a closed swamp cooler so not adding any moisture to the boats interior. In august the waters under my keel in port orchard are rarely over 60f even with an air temp well over 80f.

Wellllllll, not really. A swamp cooler relies on evaporation to pull heat from the air, the heat of vaporization. Doing so with seawater will cause a buildup of salt crystals leading to an eventual mess. A radiator on the other hand transfers the heat from the cabin to the seawater contained in the radiator, and then overboard. A more compact and clean type of cooling.....but needs a sufficient delta of temperature to be efficient.


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Old 26-03-2016, 08:59   #7
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Re: "Eutectic" A/C - eg. Frozen Water - possible?

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Wellllllll, not really. A swamp cooler relies on evaporation to pull heat from the air, the heat of vaporization. Doing so with seawater will cause a buildup of salt crystals leading to an eventual mess. A radiator on the other hand transfers the heat from the cabin to the seawater contained in the radiator, and then overboard. A more compact and clean type of cooling.....but needs a sufficient delta of temperature to be efficient.


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You are right I was trying to be simple in my last post I should have been more technical. The delta is sufficient here in the Puget sound that it would work rather well. Right now the water temp is 49 deg under my keel. Last year it varied from 57 to 61 deg from July thru august. But my real question would be why do all that plumbing. Just turn the Dorado into the wind open the bow hatch and deploy the wind scoop. Lots simpler and cheaper. And no holes in the hull.
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Old 26-03-2016, 09:50   #8
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Re: "Eutectic" A/C - eg. Frozen Water - possible?

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You are right I was trying to be simple in my last post I should have been more technical. The delta is sufficient here in the Puget sound that it would work rather well. Right now the water temp is 49 deg under my keel. Last year it varied from 57 to 61 deg from July thru august. But my real question would be why do all that plumbing. Just turn the Dorado into the wind open the bow hatch and deploy the wind scoop. Lots simpler and cheaper. And no holes in the hull.

That's my general feeling about that also, but when I lived up there I met lots of people with pasty white skin who looked like they were dying when the temp hit 75!!


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Old 26-03-2016, 09:58   #9
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Re: "Eutectic" A/C - eg. Frozen Water - possible?

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That's my general feeling about that also, but when I lived up there I met lots of people with pasty white skin who looked like they were dying when the temp hit 75!!


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Hey now I don't have pasty white skin ( but then I do work on boats outside I have a protective layer of rust)
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Old 26-03-2016, 10:17   #10
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Re: "Eutectic" A/C - eg. Frozen Water - possible?

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Hey now I don't have pasty white skin ( but then I do work on boats outside I have a protective layer of rust)

And here I thought rust was an insulator.


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Old 26-03-2016, 10:41   #11
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Re: "Eutectic" A/C - eg. Frozen Water - possible?

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And here I thought rust was an insulator.


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It is an insulator from cold but in absorbs solar radiation like nobody's bussiness( at least on me it does)
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Old 26-03-2016, 11:59   #12
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Re: "Eutectic" A/C - eg. Frozen Water - possible?

The evaporation type A/C's ("swamp coolers") need fairly low humidity levels to work efficiently. Anything higher than about 40%, and they won't do much other than give your boat problems with mould.

Just a swim and a fan works good for me.
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Old 26-03-2016, 12:05   #13
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Re: "Eutectic" A/C - eg. Frozen Water - possible?

Kokanee that works as well however here in the pnw its basicly a polar bear swim year round . Hypothermia can set in in less that 20 min in summer .
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Old 28-03-2016, 18:52   #14
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Re: "Eutectic" A/C - eg. Frozen Water - possible?

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You are right I was trying to be simple in my last post I should have been more technical. The delta is sufficient here in the Puget sound that it would work rather well. Right now the water temp is 49 deg under my keel. Last year it varied from 57 to 61 deg from July thru august. But my real question would be why do all that plumbing. Just turn the Dorado into the wind open the bow hatch and deploy the wind scoop. Lots simpler and cheaper. And no holes in the hull.
This is my first summer up here as well so I just wanted to make sure I covered the bases before I started getting a heat stroke!

I'll try opening all the ports and hatches that I have and see how it goes. Hopefully thats enough
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Old 28-03-2016, 20:35   #15
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Re: "Eutectic" A/C - eg. Frozen Water - possible?

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This is my first summer up here as well so I just wanted to make sure I covered the bases before I started getting a heat stroke!

I'll try opening all the ports and hatches that I have and see how it goes. Hopefully thats enough
It will be plenty trust me BTW where are you moving from?
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