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  #1  
Old 06-19-2006
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Smile Peltier Effect Cooler

G'Day folks
I have been reading on boats(again) and I came across something called a "PELTIER EFFECT COOLER".
Can someone explain what it is, is it popular, is it worthwhile, does it work.
It is some sort of a refer/coolbox. Also where can I find out more about it if the answer is long.
Fair winds to you all.
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Old 06-19-2006
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Solid State thermal transfer

Been around for many years.

http://www.peltier-info.com/products.html

http://www.coleman.com/coleman/colem...ategoryid=8570

http://www.aceee.org/pubs/a042_r1.pdf

http://www.colorado.edu/engineering/...5519/10tec.htm
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Thanks for that SAILANDOAR.
I will start more reading.

Last edited by sailorjim99; 06-19-2006 at 07:38 AM.
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Pelletier effect coolers aren't all that efficient, compared to a good compressor-based refrigeration system. They are also fairly dependent on the ambient temperature, as they can only cool a certain amount. Most of the Pelletier effect coolers can only claim to cool 40 degrees from ambient. On a 95 degree day, that's only 55 degrees, which is not sufficient to keep food fresh or prevent bacterial growth.
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Peltier coolers operate on the same principle as a thermocouple, only in reverse. They are VERY power hungry. A typical sized peltier-cooled cooler (like you'd take camping) will drain a car's batteries overnight if left running. That coupled with Sailingdogs's noted limitation in cooling ability makes them marginally useful.
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Peltier Effect

This is a non-tech answer to what I think you are asking. Yes they work quite well as long as you have a power supply they were used in space capsules,basicly using two metals with current passing thru them the space in between is cooler and is then blown into a space to chill,reversing the current will create warm air.As stated in other posts,the downside is you are limited to a forty degree drop in the ambient temperature.I use a cooler on board and it works as long as the temp does not get past 75 to 80 degrees.Had it on all night and it didn't drain house battery.nice thing about it is you can load it at home,plug it in at the car on the way to the boat,then plug it in at the boat already cool.I was wondering if might be better to buy one of those small dorm room refridgerators,and a 500w inverter.Hook them up to the house system.a two or three hundred dollar investment as compared to six to seven hundred for a 110ac/12vdc fridge with the same volume?
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IIRC the dorm fridges, like all home fridges, need to be kept level to work. Get one on sale at WallyWorld for $75 and if if works...great.

But I think there is one maker of Peltier coolers from South Africa where they were meant for uses like safari. Expensive, stainless cladding, and capable of doing better than the usual 40-odd degree cooling. Emphasis on expensive, don't remember the brand name.

Meantime, block ice and dry ice work very nicely, and if you can't get block ice ask your local ice cream store if they can deep-freeze a couple of gallon jugs of spring water for you overnight, any commercial deep freezer will turn those into portable block ice very nicely.
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We used to use a peltier cooler in the car on the drive to the boat and then used traditional block ice in the on-board ice box. This way the food was already pre-chilled when put in the ice box and we didnt have to deal with water and ice in the car.
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Old 06-20-2006
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I use an Engel refrigerator unit, and it is quite energy efficient. At the a setting of 1.5 out of 5, the lower half of the little fridge will freeze water and most drinks fairly solid, and it uses very little electricity to do so.

What I generally do before a trip is load the Engel with everything I want refrigerated, and turn it up to 4 or 5 the night before. The large bottles of juice then freeze overnight...and I can turn the Engel down to 1 or off and the bottles will act like ice and keep everything nice a chilly.
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You know what the first rule of sailing is? ...Love. You can learn all the math in the 'verse, but you take
a boat to the sea you don't love, she'll shake you off just as sure as the turning of the worlds. Love keeps
her going when she oughta fall down, tells you she's hurting 'fore she keens. Makes her a home.

—Cpt. Mal Reynolds, Serenity (edited)

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