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how to make Peltier cooler? Answered

i like to make a Peltier air cooler. how much watts Peltier is needed and battery for Peltier cooler to run for 8 hour.if i use less watts Peltier does it affect the cooling rate.
is it possible to place place another Peltier above heat sink while the other one Peltier is working, if possible how much amount of power can be produced from the Peltier placed above heat sink.


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seandogue (author)2010-10-03

Understood. I think you should do some google research. Much much much info available. Skip wikipedia on this for tech info. Go to the mfg sites...Many of the companies involved have both detailed and readable documents available for download that will educate you...after all, they want to sell their devices to you and need to educate their potential customers about how to use these nifty gizmos...look for "application notes"

Regarding stacked operation, yes, that's a common practice when trying to achieve cold temps or fast heat flux.

HOWEVER,while a cool idea on the face of it, using them for thermoelectric scavengers requires a cold sink. Their ability to convert heat into electricity is critically dependent on a temperature difference between the hot and cold sides, and it is proportionate to that temperature difference. If you placed the device above a unit pumping heat out of something, you'd initially get some current flowing in device #2, but them the unit itself would heat up (with time) and the current would steadily decrease to zero.

I can't specify what current you'd get for an unknown temperature difference or the specific unit in question.

Your "average" peltier block has a load range of about 0-4 amps, where the heat flux is proportionate to the input current. Specific models will vary accordingly from what I just said.

They also operate in different Input Voltage ranges on a model by model basis, so that's a consideration to think about...

Melcor, I think, is one company you should lookup...

good luck, and enjoy!

BTW, neat thing about Peltier devices is that they're bidirectional, so they can both cool and heat...makes an interesting statement when you want something to stay at a specific temperature, doesn't it?

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