Powering TEC, pump and system

[Chucky]

My friends now said to me that i'm gonna need a 240 volt pump instead of my newly purchased 12v D5 because the pump and TEC will need to be switched on before i power the system to make sure the cpu doen't fry. To the people that already have systems running smoothly wots the correct order of powering on the cetain components or do you have the TEC, pump and system all powering up at the same time??????

[theelectic]

The pump needs to be switched on first, no flow and TEC on would be disastrous. Swiftech has a relay kit available for this very purpose.

[Chucky]

Does the relay from swiftech turn on the pump before you start system then.... this was the arguement i was havin with him. so you turn on the pump then the tec psu then the system?

[cyberspyder]

Does the relay from swiftech turn on the pump before you start system then.... this was the arguement i was havin with him. so you turn on the pump then the tec psu then the system?

No, no. Press the power button on your compy, and all the TEC stuff (pump etc...) will turn on at the same time as your computer. Pretty ingenious.

Brendan

[Chucky]

so everything turns on at same time yeah. He was saying that i need to initially turn on the pelt and pump before i turn on compy due to heat generated from cpu. so wen computer boots the cpu will already be cooling from the pump and pelt.

[littleowl]

chucky on my system I power on the meanwell that runs pump, and tec as well as 2 120mm fans on the rad. Then turn on the system.. you can do the swiftech relay and turn it all on at one time also. but do not let tec and stuff run for more then a couple min without the cpu running..

[Chucky]

so running all that before powering on system doesnt chill cpu too much then... i'm running a D5 12v pump...will i be able to do the same then...wire up the tec , pump and fans. meanwell psu same as you , pump as mentioned above and 2 fans.

[Baenwort]

I would wait for NoL for finial word but with my Video Card TEC I use the Swiftech relay as the card isn't placed in it's overclocked state till I'm in windows.

Now on a CPU TEC I've never done so I"m not sure if the TEC cools off fast enough for a boot OC.

[littleowl]

so running all that before powering on system doesnt chill cpu too much then... i'm running a D5 12v pump...will i be able to do the same then...wire up the tec , pump and fans. meanwell psu same as you , pump as mentioned above and 2 fans.


yes you can! I use one of the under monitor power switch things! just have to make sure no one plays with your pc other then you!
I run my pc 24/7 at 100% cpu load and never had any trouble. the only problem I can say that I had was my electric went off and when it came back on my tec setup did too but the pc was set to stay off. I had to turn off the tec unit for about 30 min to get the cpu warm enough so that I could boot it up.

[rehab]

Alright Chucky Carp,

I wouldn't have called it an argument, more of a debate. Glad to hear you've got it sorted from people in the know :toast: Maybe this will encourage you to finally get all the remaining parts ordered - looking forward to the results :fact: and helping build:D

PS I was right about the relay and about the Meanwell PSU powering pump :stick: Hadn't thought about the fans tho:clap:

[littleowl]

but keep in mind rehab he is talking about a 24v meanwell so you can only run it at 12 if you put the pump and fans on it. or maybe he is talking about a 12v meanwell

[rehab]

I see, Chucky has bought the following for the CPU (as an introduction to TEC and once we/he figures it out ie. condensation etc, upgrade it to the 226W):
Potted Peltier rated @ 172W 11.3A 24.6V, Delta Tmax of 69 deg C

So, ideally he needs to use the 24V Meanwell PSU but the pump and fans cannot be powered directly from this.

Is there way for him to power the pump and fans independantly of the system whilst using the 24V Meanwell?

Alternatively, if he used a 12V meanwell PSU would you expect Delta T of the Pelt to be reduced by 50% (is the relationship between voltage and delta t linear)?

Cheers Rehab

[littleowl]

what cpu is he using?

[rehab]

Opteron 146

[Chucky]

Opty 146

[littleowl]

Is there way for him to power the pump and fans independantly of the system whilst using the 24V Meanwell?
yes just take the voltage down to 12v.

take a look at the undervoltage chart
http://www.xtremesystems.org/forums/showthread.php?t=67927

[littleowl]

Opteron 146

Opty 146

:D good timing!!

I would get the 320w tec and undervolt it to what you need! I have only ran 12v tecs IMHO if you need a 24v one then you need to move to phase or chiller "just my opinion"

[rehab]

I see (thanks for the link). So by using a 320w pelt at 12v, its equivalent to using a 235w pelt @ 24v (if I've interpreted the link correctly)?

[littleowl]

yea for the most part. the part you need to figure out is this the wattage is that how much wattage of heat it moves or how much it consumes?

[littleowl]

if you guy one off of ebay they say it is a 226w/320w pelt. well it is more like a 226w

[rehab]

I was always under the inpression that it was the wattage of heat removed by the pelt but good point i will have to check that in future. So for yours, its uses 320w and removes 226w of heat hence, 226/320?

One last question littleowl, from previous posts I am under the impression that the 24V Meanwell can be turned down to 12V. If this is the case and Chucky runs a true 320w (heat) at 12v, the pelt will be pulling approx 22.3amps, would there be enough power remaining from the meanwell to power an additional pelt for his gpu? Or am I running away with myself on a tangent :rolleyes:

Cheers Rehab

[littleowl]

yes on the first question! as for the second yes it can run 2 pelts but I wouldn't recomend doing 2 320w tecs because the amps would be cut in half if I am correct. half to one pelt and the other half to the other

[rehab]

It would't be an additional 320w. I was thinking that Chucky will now have redundant 172w, obviously if he decides to go ahead with the 320w @12v.

Therefore 22.3amps for the 320w @12v and approx 5.5amps for the 172w @12v = approx 27 amps (2 amps above the 12v meanwell spec, not sure about the 24v). The only concern I would have is that the 172w gpu pelt would only be removing 41w of heat @12v.

He also has a Potted Peltier rated @ 80W 8A 14.4V (ie 12 volts: 43.0 watts; 5.96 amps) but it down to you now chucky

Thanks for all your help littleowl:D . all seems a lot clearer now - I may even do it myself:p:

[littleowl]

are you sure that the 172 is a 24v pelt? Most I have seen are rated for 12v now.

[rehab]

Just checked it out on the site where he purchased it from its a Potted Peltier rated @ 172W 11.3A 24.6V, Delta Tmax of 69 deg C
So those rough calcs should still stand as ball park figures.

[littleowl]

yea