peltier+rheobus = disaster?

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umbra

[H]ard|Gawd
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Jul 27, 2004
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I'm looking to install a peltier soon but I don't want to have to worry about condensation as much as others and I was wondering if I copuld use a rehobus to adjust the voltage or if the rheobus would break and the peltier wouldn't work. so I was wondering if I put the rheobus on a and the peltier on the same line if I could adjust the power going into the rheobus thereby saving me cash on buying a extra 500watt psu or one of those really exspensive independant psus.
 
umbra said:
I'm looking to install a peltier soon but I don't want to have to worry about condensation as much as others and I was wondering if I copuld use a rehobus to adjust the voltage or if the rheobus would break and the peltier wouldn't work. so I was wondering if I put the rheobus on a and the peltier on the same line if I could adjust the power going into the rheobus thereby saving me cash on buying a extra 500watt psu or one of those really exspensive independant psus.
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Dont' bother trying it........Peltiers aren't that simple....can't just hook them up to a controller and turn them down. There also isn't really any way you can avoid condensation with the Pelt though, as once they're powered...that's it...there's no "turning them down", and you WILL get condensation.

I suggest you do a bit more reading up on the topic (no offense/harm meant) before diving in.....because a standard rheobus is nowhere CLOSE to what you'd need for a Pelt of any kind, you're pretty much gonna HAVE to get a seperate PSU of some kind.....and even though they are a bit pricey, those Meanwell 5.25" units are some of the best I've seen.

This isn't a cheap thing to do or a cheap hobby by any means....and you gotta be willing to shell out the extra cash for those few extra MHz if you really want to go past h2O at all.
 
I'm well aware of the need for an extra psu especially one with great amps I'm surrounding it with neoprene I just don't need all that cool goin on my cpu and I don't need all that extra heat from the hot side to be dissipated in my loop
 
umbra said:
I'm well aware of the need for an extra psu especially one with great amps I'm surrounding it with neoprene I just don't need all that cool goin on my cpu and I don't need all that extra heat from the hot side to be dissipated in my loop
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All I'm saying is that I don't think that the rheobus is an option.....you're gonna be dealing with "all that cool" and "all that extra heat" if you go with a Pelt anyways. There are different "sizes" of Pelts to you know, find out using SiSoft Sandra how much Wattage (worth of heat) your cpu is putting out, and get a Pelt a bit larger then that.......that way if your cpu put out say...90W of heat, you coudl get a Pelt about 100W and you wouldnt have any extra heat being put into the loop, but the cpu'd be nice and chilly.

Sry bro, but this is one of those times where there isn't really any "easy" or "cheap" way out. ;)
 
You can vary the voltage to peltiers, effectively changing their heat-pumping capacity or "turning them down". However, you're going to need to use a variable-voltage power supply or else a really beefy "rheobus"- not something you buy from CompUSA. Using something to reduce the voltage to the peltier is not going to save you anything. If you want to do it, either get a variable power supply or a set lower-voltage power supply and take a lucky guess at what voltage you need. If you want to do it right, get a lower-power peltier. If you want to do it [H], seal everything up to prevent condensation- don't try to avoid the problem.
 
zer0signal667 said:
You can vary the voltage to peltiers, effectively changing their heat-pumping capacity or "turning them down". However, you're going to need to use a variable-voltage power supply or else a really beefy "rheobus"- not something you buy from CompUSA. Using something to reduce the voltage to the peltier is not going to save you anything. If you want to do it, either get a variable power supply or a set lower-voltage power supply and take a lucky guess at what voltage you need. If you want to do it right, get a lower-power peltier. If you want to do it [H], seal everything up to prevent condensation- don't try to avoid the problem.
Click to expand...

That's more or less what I was getting at in reference to the adjustments.....just didn't clarify enough. Everything was phrased like you wanted to adjust the Pelt itself with a simple rheobus....so I'm sorry for any misunderstandings.

I do agree though.....if you wanna go toe to toe with your own Pelt setup, be ready to face the task of sealing everything off to prevent condensation dmg.
 
yeah well I already have a 226 watt pelt and this http://www.thermaltake.com/accessories/hardcano/a1659.htm is my rheobus. Since it only acts as a resistor I was wondering if it would work it's a pretty high quality one too. The fact of the matter too is that you don't need to get your cpu to negative degrees celsius to get a hefty oc. What my goal is to get my cpu running aroun 60 degrees farenheit at idle then when load builds up and temps rise raise the voltage to the pelt a little. thereby extending the life of the chip as opposed to supercooling it to freezing temps and having it burn out after a year. I know the pelt is overkill but it was a good price and if I can turn down the volts I could still keep the cpu cool as I want and buy a cheaper psu and save a few bucks. I'm still gonna cover everything with neoprene I'm just trying to figure out if my rheobus would work for this task or not
 
umbra said:
yeah well I already have a 226 watt pelt and this http://www.thermaltake.com/accessories/hardcano/a1659.htm is my rheobus. Since it only acts as a resistor I was wondering if it would work it's a pretty high quality one too. The fact of the matter too is that you don't need to get your cpu to negative degrees celsius to get a hefty oc. What my goal is to get my cpu running aroun 60 degrees farenheit at idle then when load builds up and temps rise raise the voltage to the pelt a little. thereby extending the life of the chip as opposed to supercooling it to freezing temps and having it burn out after a year. I know the pelt is overkill but it was a good price and if I can turn down the volts I could still keep the cpu cool as I want and buy a cheaper psu and save a few bucks. I'm still gonna cover everything with neoprene I'm just trying to figure out if my rheobus would work for this task or not
Click to expand...


I just told you it won't work... Take a look at the specs for that rheobus. The website doesn't explicitly say how much power it can handle, but it appears that it's 4.2W for 2 of the channels and something greater than 4.2 for the other 2, but probably much less than 10W even. If you'd like to pull 226W through this thing just for the fun of destroying it, go right ahead, just take pics for our entertainment please :D
The device does not just act as a resistor. It's basically a simple voltage regulator, based on transistors. You need pretty beefy ones to regulate voltage and still allow the kind of current necessary for your peltier. Aside from that, even a resistor-based "regulator" would have to have some pretty badass resistors to accomplish this task. In each case, the energy that is regulated is released elsewhere as heat.
 
zer0signal667 said:
I just told you it won't work... Take a look at the specs for that rheobus. The website doesn't explicitly say how much power it can handle, but it appears that it's 4.2W for 2 of the channels and something greater than 4.2 for the other 2, but probably much less than 10W even. If you'd like to pull 226W through this thing just for the fun of destroying it, go right ahead, just take pics for our entertainment please :D
The device does not just act as a resistor. It's basically a simple voltage regulator, based on transistors. You need pretty beefy ones to regulate voltage and still allow the kind of current necessary for your peltier. Aside from that, even a resistor-based "regulator" would have to have some pretty badass resistors to accomplish this task. In each case, the energy that is regulated is released elsewhere as heat.
Click to expand...

Exactly what I was gonna say....something as "sad" as that Tt controller isn't gonna do didly shit for a Pelt....unless you wanna make a movie of you turning on your compter to see the unit go up in smoke. :p
 
i think it is a cool idea to have a pelt volt adjustable when at idle you can have it at say 6 volts keeping it just above ambeint but when you start to game you can up the volts and keep the temp the same. sound cool to me.

i have used a R\C car speed control to adjust the voltage of a pelt i was cooling off a waterblock in a attemp to make a water chiller .

i have a vantec nxp201 PWM "reobus" it is probly the strongest reobus you can get and it is only rated for 15 watts, a 226 watt pelt should draw just what it says 226 watts or about 18 amps that is way out of spec if you wanted to make one for your north-bridge and use say a 40 watt pelt you can use a simple LM338 volt regulator other then that i don't think i have any ideas on how to control the bigger pelts
 
jeclone said:
i think it is a cool idea to have a pelt volt adjustable when at idle you can have it at say 6 volts keeping it just above ambeint but when you start to game you can up the volts and keep the temp the same. sound cool to me.

i have used a R\C car speed control to adjust the voltage of a pelt i was cooling off a waterblock in a attemp to make a water chiller .

i have a vantec nxp201 PWM "reobus" it is probly the strongest reobus you can get and it is only rated for 15 watts, a 226 watt pelt should draw just what it says 226 watts or about 18 amps that is way out of spec if you wanted to make one for your north-bridge and use say a 40 watt pelt you can use a simple LM338 volt regulator other then that i don't think i have any ideas on how to control the bigger pelts
Click to expand...

I agree, kinda tricky for the larger pelts....oh, and I used to own the 201....it was just over 18W per channel it was rated for.....I could easily run a pair of 9W tornado's off one channel. :)
 
get a light dimmer from walmart!!!! i have one running an industrial fan for my airbrush booth..
some times you want a spray effect so you have to turn down the fan. it runs at about 50% most of the time. no problems....should be able to handle your pelt...
 
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