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Xtreme Cooling LN2, Dry Ice, Peltiers, etc... All the usual suspects

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Unread 04-12-2003, 11:44 PM   #1
SparkedFire
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Controlling peltier watt usage

Is it possible to controll a peltiers watt usage by a 3 way toggle switch, or some other simple cost efective means? I know there are devices that can controll peltier power usage but the temperature range of the sensor is not desireable. The goal is to be able to use pelts, but adjust power usage according to conditions. Example gaming, vs idle ; high cooling, vs low cooling (respectively). I will use a two loop water cooled system with a pelt water cooling device/contraption (similar to the "peltier based water chilling exparament" thread).

[url=http://forums.procooling.com/vbb/showthread.php?s=&threadid=5810]

Please post any ideas or comments here.
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Unread 04-14-2003, 09:17 PM   #2
RoboTech
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Hey SF,

To control a TECs wattage you just have to adjust the applied voltage - the amps will follow voltage (as voltage increases, so will the current draw). Now doing so with a 3-way switch might not be so easy. You would have to have two power (voltage) sources one high, one low and switch between them.

Another method you can use if you are building a water-chiller with multiple TECs is to switch on 1, 2 or 3 TECs for low, medium and high cooling. I tried this with my two TEC chiller once. One TEC is powered on all the time - basic cooling. I used a temp probe from a DigiDoc5 to monitor CPU waterblock temps and when they exceeded the programmed trip point on that channel of the DigiDoc, the fan output associated with that temp probe turned on. Instead of turning on a fan, the DigiDoc triggered a high current solid state relay which turned on the second TEC power supply - high cooling. You could expand the theme to three TECs or more depending on your goals and budget...

Of course you don't have to use an automated controller (DigiDoc - now that's a strectch) you could just use toggle switches.

Good luck,
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Unread 04-15-2003, 03:06 PM   #3
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Hey, thanks RoboTech. I will take this into consideration!
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Unread 04-16-2003, 07:39 PM   #4
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just thought about this, but couldn't you use a variable resistor like a volume control dial?
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Unread 04-16-2003, 08:20 PM   #5
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A variable resistor that can take the current draw of a 226 Watt TEC would be enormous, and would dissipate enormous amounts of heat itself.
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