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2nd "law" violations => Heat to electric energy conversion => Topic started by: charmrus on January 17, 2009, 11:51:15 PM
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Im looking to purchase some Peltier juntions for power generation experiments and am a bit confused by what I should get. They are listed by thier wattage and size. The wattage thats listed is for what it consumes for use as a cooling device. Im seeing wattage differences for same sized package also.
Basically what Im in need of is how would I figure which or what attribute I should be using for comparision for getting the most bang for the buck. Would 2 30mm pcs be better then 1 60mm pc. Is there a "potential" density to the different sizes/wattage?
I realize that the temp. difference from one side to the other makes a difference but how would I compute that into wattage/size?
Thank you for any help given.
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Hi,
here is a list of types available.
This one is sorted by Qmax (W)
http://www.dr.neumann-peltier.de/peltier-chips-sortierung-q-max.pdf
hope it helps.
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I have several different values, 80 watt , 120 watt and 250 watt , all with voltages around 18 volts for maximum and 4, 6 and 8 amp respectively. they all need a temperature differential of 100 degrees to reach 2/3 rds their rated value. 100 degrees differential is pretty hard to achieve in everyday life. but you can drive a couple of high intensity LED's with a difference of only 40 degrees or so. with a single 80 watt device and a temperature differential of 40 degrees , I was able to get around 5 volts @ almost 2 amps without voltage drop. On a much larger scale this could work very well, in my opinion.