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TEC Air conditioner: Suggestions please! - Page 3

post #21 of 26
Quote:
Originally Posted by Bit_reaper View Post

Well with constant flowing coolant and warm up form the ambient air flowing over the cold side rad the coolant should never get anywhere near that cold (if it does you desperately need a better fan, more radiator space).

Oil is a no go as it gets to thick when cold. Alcohol would work but is expensive, evaporates quickly and has poor thermal conductivity. I would use antifreeze and distilled water. You probably wont need it to be more then -10C proof as like I said the coolant should not get that cold as you want the cooling out in the room not "stuck" in the loop.



The problem is, that even if the cooling loop doesn't get that cold the block on the coldTEC might. In fact, the coldside of the TECs should get to -30celsius. That means ice could slowly build up on it, and that can burn out the TEC and the pump, so you want some type of coolant rated down to at least -35.

As I said before, mayhems XT-1 glycol based coolant in a 50/50 ratio with distilled water should be a good mixture.
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post #22 of 26
Quote:
Originally Posted by ZytheEKS View Post

The problem is, that even if the cooling loop doesn't get that cold the block on the coldTEC might. In fact, the coldside of the TECs should get to -30celsius. That means ice could slowly build up on it, and that can burn out the TEC and the pump, so you want some type of coolant rated down to at least -35.

As I said before, mayhems XT-1 glycol based coolant in a 50/50 ratio with distilled water should be a good mixture.

I'm very skeptical of a TEC this size being able to hit thous kind of temps even on the block it self. Most TECs of this kind have a max temp delta of about 70C so for the TEC to be even physically able to hit that temp you need to keep the hot side under 40C. And the the TEC won't burn out even if the cold side froze as long as the hot side does not go above the the max temp (usually about 100C).

But its always possible to use mix antifreeze for -35C or lower (antifreeze is also glycol based by the way).
    
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post #23 of 26
if you could get a decent current, two regular 'well-placed' house fans would do a lot more than a PC-conditioner...

If you are talking about computer illiterate people seeing this, then why not just have the fans in your rig run while it is off? can always say the PSU has glitch and heats up so you have to constantly cool it for it to be able to start (be careful of too much BS, they might say it's a fire hazard if you go too far).

BTW- what happens when someone walks into your room if you do get it working? even if they don't think it's the computer- if it's a lot cooler than the hall outside then people are going to think you're hiding the AC somewhere.
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post #24 of 26
Thread Starter 
Quote:
Originally Posted by Blue Dragon View Post

if you could get a decent current, two regular 'well-placed' house fans would do a lot more than a PC-conditioner...

If you are talking about computer illiterate people seeing this, then why not just have the fans in your rig run while it is off? can always say the PSU has glitch and heats up so you have to constantly cool it for it to be able to start (be careful of too much BS, they might say it's a fire hazard if you go too far).

BTW- what happens when someone walks into your room if you do get it working? even if they don't think it's the computer- if it's a lot cooler than the hall outside then people are going to think you're hiding the AC somewhere.

I'm doing this project for the sake of the project. If it works, that's a bonus. I'm not expecting the device to be able to cool the room much--basically just make a small cold current in one direction (obviously pointed at me while I'm browsing OCN). As long as I don't have a window unit or something that's a blatant A/C unit, I'll be fine.

As far as the coolant goes:
I'm not expecting the loop temps to hit -30, but as mentioned above, I do suspect it will get pretty cold. There is no heat load other than the TEC's in the watercooling loop so the hot side should stay pretty cool, and therefore the cold side will be quite cold. This is all speculation really, but I'd like to be prepared.
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post #25 of 26
Quote:
Originally Posted by alcal View Post

I'm doing this project for the sake of the project. If it works, that's a bonus. I'm not expecting the device to be able to cool the room much--basically just make a small cold current in one direction (obviously pointed at me while I'm browsing OCN). As long as I don't have a window unit or something that's a blatant A/C unit, I'll be fine.

As far as the coolant goes:
I'm not expecting the loop temps to hit -30, but as mentioned above, I do suspect it will get pretty cold. There is no heat load other than the TEC's in the watercooling loop so the hot side should stay pretty cool, and therefore the cold side will be quite cold. This is all speculation really, but I'd like to be prepared.

Ultrasonic2's TEC Calculator says that if you have no heat load, and run them at 12v with the hotside of the TEC at 40degrees Celsius you will have a -30celcius coldside. I doubt the hotside will be THAT hot with no heatload. Let's decrease that to 30 degrees celsius. You are now looking at a -37 degree coldside. Your liquid itself will get nowhere near that cold, HOWEVER it WILL be flowing over a surface that IS that cold. For this reason you NEED a coolant that can withstand these temps. If you don't there will be frozen liquid building up on the chiller block. This is BAD. It causes intense flow restriction problems with the loop and will inevitably burn out your pump. It will also burn out your TECs.
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post #26 of 26
I am working with TEC (Peltier Cell) and Liquid Refrigeration. I am trying to achieve low temperatures (below 0 ºC). My set up is made by a water pump, an aluminum bloc, a Peltier cell (TEC1-12706) and a mix of water and ice.
I think that if you use a huge tank of water, the temperature of warm side could be constant for a long-time, better if the tank is open, because the evaporation of water helps. I have some videos of my experiments:


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