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Xtreme Cooling LN2, Dry Ice, Peltiers, etc... All the usual suspects |
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04-01-2003, 09:38 PM | #1 |
Cooling Neophyte
Join Date: Mar 2003
Location: Canada
Posts: 2
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Noob question on Peltier wattage
Greetings to all. New to the forum but I must say congradulations to all the denisens that make up this fine repository of wisdom and experience. I have benifited greatly thank you
OK I have three pelts that were given to me. Is there any way one can determine there characteristics/specs without any other information other than the units themselves? I have gone over them with my microscope and can find no identifiable markings. Thank you in advance for your time and consideration of my request Kindest Regards Z |
04-04-2003, 07:53 AM | #2 |
Cooling Savant
Join Date: Sep 2002
Location: Cincinnati, OH
Posts: 229
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Hey Zoltan,
Welcome to the forum... I'm no expert but I can tell you what I have done 1. Size - are they 40 mm square or 50 mm? The larger the TEC, the larger the wattage rating usually. 2. Test each one with a variable output power supply to find out where they work best. (0 - 30 VDC up to 25 amps) Mount the pelt between a cold plate and water block. Hook up the waterblock to a water-cooling system (to keep the hot side cool during testing). Start out at about 10 VDC and mesure the temp of the cold plate. Every few minutes turn up the voltage 1 or 2 volts and check cold plate temp. Keep doing this until the cold side temp starts getting warmer as the voltage increases. The minimum voltage you get the most cooling is the TECs sweet spot and is usually a few volts below it's factory rated Vmax. Good luck... |
04-04-2003, 08:20 AM | #3 |
Cooling Neophyte
Join Date: Mar 2003
Location: Canada
Posts: 2
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Hello RoboTech
Many Thanks for your practical advice. I appreciate your time in reply Kindest Regards Z |
04-11-2003, 09:38 AM | #4 |
Thermophile
Join Date: May 2001
Location: UK
Posts: 1,064
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Size has little relevance to cooling power. A 40mm TEC could be anything from 10W to 172W. The easiest way to get a rough estimate is to power one up and read how much current it draws, then multiply by voltage*0.7 to get a rough estimate of the cooling power of the TEC. You should test at around 12-15V to get a reasonable reading.
So for instance if you power up at 12V and get 20A current draw. You can do 12*20*0.7 = 168W. And that's roughly the cooling power of your TEC.
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04-11-2003, 12:06 PM | #5 |
Cooling Savant
Join Date: Sep 2002
Location: Saskatoon, Saskatchewan
Posts: 294
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Keep in mind though, if it's cooling 168W at 12V, then it's probably a 220W TEC, since they are rated for 220W at 15.2V.
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