zeig

I'm currently working on a project and need to power a Peltier (electrothermal) cooler. Is there any way i can get cold temperatures with a battery?I've provided a link to the component, they are around 12V and 77W and about 6A.


http://www.amazon.com/TEC1-12705-The...m/B002UQKEU8/2


is there any electrical circuitry i could use off a basic battery or any way to power one of these? I need some cool temperatures on the cool side of the Peltier chip to cool some water, I'll have a heatsink and fan attached to the hot side to increase efficiency.


Thanks~

triden

For that amount of power you will need to use a car battery. Otherwise, just find a used PC power supply or laptop power supply and run it off that. You don't need any special electrical circuitry to power a peltier cooler unless you want to limit the temperature change. In this case you would use a current limiting device, but that is optional. Sounds like the rest of your setup should work.

Chris

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LJSMITH1

Why not just use a straight up Liquid Cooling System for a CPU? I am not sure how cold you need to get (or how many BTU's you need to remove), but the Peltier modules don't really pull that much heat out for the wattage used. Plus the fact that you are converting to a water system anyway, makes these preconfigured systems all the more attractive. Plus the overall power usage would probably be less for a 120MM muffin fan motor (typically less than 4W).


http://www.directron.com/bxrts2011lc.html

http://subzeropcs.com/

http://www.frozencpu.com/

However, if you are looking to cool something below room temperature (i.e. chill), the Peltier might be your best bet. Here are some systems that you might be able to hack to get in a configuration you need.

http://koolatrononline.stores.yahoo....s-warmers.html

Maybe you use the Peltier in conjuction with the preconfigured liquid cooling system?

A car or marine battery, or scooter battery (lead acid, deep cycle, AGM) would be your best power source for such an application.

Have fun!

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Larry

zeig

I'm not lookin to cool my laptop with this project. more of a portable self cooler

LJSMITH1

I am not suggesting that. I was suggesting that you use it to get rid of the heat from the peltier....

Good luck with just using a peltier....

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Larry

Big John

I made a little soft-drink cooler with one of these. Your best bet is just to get a small switching-mode power supply with inherent overload protection. Try Marlin P. Jones Associates. They sell a lot of that stuff cheap.

-John

Semi-Ret Electrician

Those coolers are great for road trips, camping or getting groceries home. Mine drew about 6A at 12VDC and dropped the temp about 30 deg.

It would keep a bag of ice frozen for a couple of days and worked fine off a 120v/12V 8A battery charger at a campsite.

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zeig

oh my bad haha, Uhm, i would if it wasnt so redundant, using a water cooler to cool my water cooling system :P.. ill throw a heat sink on it and a fan though.

BUT i really need a semi lightweight batter that can last 2-4 hours =/ only needs to get down to around 40 degrees i guess

LJSMITH1

Ditch the Thermoelectric cooling. It won't work for your application.

Build a heat echanger backpack with a small pump and circulate a glycol solution through a suit of tubing. Fill the backpack with ice and dry-ice.

Use a couple of R/C, high-capacity, Lithium Polymer (LiPo) batteries. Way more power for the weigh than AGM or Wet cell batteries.

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Larry

zeig

I'm going to circulate my coolant in a suit but i planned to cool it with the TEC chip, that wont work? i feel with such low temps im cooling it would. i need the back to stay small

LJSMITH1

Do some research and you will see what I am talking about.

http://thermal.ferrotec.com/technolo...ference-guide/

Heat load is your problem. The Human body + exterior thermal conditions = large # of BTU's needed which exceed most TEC capacities...

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Larry

zeig

oh yea.. What about if i just have the coolant circulated through a transmission oil cooler radiator with a fan on it? would that help lower my body temp?

LJSMITH1

I think you can figure it out with all of the information I gave you.

Good Luck!

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Larry

zeig

well...im trying.. but no equations ive found sofar really helped yet.

LJSMITH1

Google is your friend..

http://www.tetech.com/Peltier-Thermo...ator/index.php

http://www.tetech.com/Cooling-Assemb...ator/index.php

You need to work harder....

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Larry

zeig

okay the max W a human dissipates during workout is around 900W.
i plugged these numbers in and it looks like a TEC would work. did i do something wrong?

I couldn't quite get anything from the heat sink one...

im trying i swear



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zeig

any help on the above post? :/

LJSMITH1

Buddy...you seriously need to learn how to research. In less than 10 minutes, I found a load of links that show product already designed that accomplishes what you are trying to do, relevant patents, and college papers on the subject.

http://www.mscooling.com/activecooling

http://www.coolvest.com/RPCM_Cooling_Vest/Default.aspx

http://www.pages.drexel.edu/~jrc49/projects/thermo.pdf

http://www.coolshirt.net/

http://deepblue.lib.umich.edu/bitstr...ing%20Vest.pdf

http://hyperphysics.phy-astr.gsu.edu...mo/coobod.html

http://www.google.com/patents/US5386701


Lastly, here is a thread with some kid asking the same thing back in 2009 about Peltier devices on the All About Circuits forum: http://forum.allaboutcircuits.com/sh...ad.php?t=23322

Funny, quite a few folks said the same thing I already told you....

So, stop asking folks to help you. I can't even believe I gave you as much as I did.

Good luck...again.. You will need it.

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Larry

zeig

wow. before you want to be condescending how about you ask what my full plans/intentions are. I've done all that research as far as if what i want to construct exists. it doesn't. all those vests either need to be put in a freezer or have a large cooling unit that isn't practically carried.

So thanks for the help but not the attitude.

I was only looking into peltier as an alternative to my current design by the way.

MDShunk

You should make an IV kit that will tap into a vein and an artery, and circulate the human blood through a cooling tower worn on the head, like a stovepipe hat.

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