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??Peltier under no load??

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EBFoxbat

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Mar 8, 2002
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EB, MA
I have designed a unit, atleast it works in autoCAD. However, it utilizes a peltier thermoelectric cooler. I have never worked with one of these before. I'm 17 and I'm building a new system. I'm going to see what I can get out of my XP1700. And we'll see what a real cool case does for my GeForce 2 (64mb of course). The only problem with my design is that it utilizes a peltier to cool air which is then pushed into the case (which is negativly preasured). My question is: If there is no load on the cool side of the Peltier, just a heatsink on the hot side, will the cool side cool the air around it? If not, Can I put a heatsink on the cool side and have the heatsink get real cold? Thanks for the help.

EBFoxbat
 

res0r9lm

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Joined
Dec 14, 2001
Location
florida
EBFoxbat said:
I have designed a unit, atleast it works in autoCAD. However, it utilizes a peltier thermoelectric cooler. I have never worked with one of these before. I'm 17 and I'm building a new system. I'm going to see what I can get out of my XP1700. And we'll see what a real cool case does for my GeForce 2 (64mb of course). The only problem with my design is that it utilizes a peltier to cool air which is then pushed into the case (which is negativly preasured). My question is: If there is no load on the cool side of the Peltier, just a heatsink on the hot side, will the cool side cool the air around it? If not, Can I put a heatsink on the cool side and have the heatsink get real cold? Thanks for the help.

EBFoxbat
yes you will need a heatsink on coldside
 
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EBFoxbat

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EB, MA
The heat sink on the cold side, will cool the air around it, right? Then I can blow it in the case...
 
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EBFoxbat

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I plan on a heatsink on both sides of the pelt. it will be fitted in abox haning out the front of my case. The hot sink will have a fan blowing out the front of my case while the cool sink (and hopefully cool outside air) will be blown into the case. The case will have atleast 2 blowholes, plus an 80mm fand plus the one on the cpu heatsink. and I dont even ask too much preformance from my xp1700. Will the cool air being blown in create condensation on my interior components? I'm starting to make myself nervous with condensation...!
 

res0r9lm

Member
Joined
Dec 14, 2001
Location
florida
EBFoxbat said:
I plan on a heatsink on both sides of the pelt. it will be fitted in abox haning out the front of my case. The hot sink will have a fan blowing out the front of my case while the cool sink (and hopefully cool outside air) will be blown into the case. The case will have atleast 2 blowholes, plus an 80mm fand plus the one on the cpu heatsink. and I dont even ask too much preformance from my xp1700. Will the cool air being blown in create condensation on my interior components? I'm starting to make myself nervous with condensation...!
I don't believe it will get condensation because you would be cooling the whole case the only condesation you would see if any would be where cold air meets the warmer air in the room.
I don't believe an airchiller would be very effective but it doesn't hurt to try.
 
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EBFoxbat

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EB, MA
Is a old 486 (90 Mhz?) heatsink enought for it?

Hoptfully it'll look somthing like this:
 
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Diggrr

Underwater Senior Member
Joined
Nov 29, 2001
If both fans are open air (not ducted) the air will just circulate in a circle.
You can try ducting into the hot-side fan through the case door so the hot side fan is getting cool outside air instead of sucking your chilled air from the top. You would also have to duct the area outside of the case, so the cool side isn't sucking the hot side's air.
An easier way than ducting would be the move the hotside's airflow crossways from the coldside's. Intake cool air from the right lower case door, and exhaust the hotside on the left panel door.

Forgive my hacking on your picture to illustrate:
 
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EBFoxbat

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EB, MA
The entire unit will be outside of the case mounted in its own box. It will probably have its own PS. The only opening in the case is opposite the fan on top. The top and bottom of the peltier will be separated by a wall to keep the air from moving in a circle. The lower section of the boz will have an opening opposite that fan to expell the hot air from the peltier into the room. That way the hot air is blow into the room and the cold air is blown into the case. The case will have a few blowholes to keep the case pressure negative. that way there will be continuous flow of cool air in and CPU heated air out. Will the cool air in the peltier (probably on the order of 15 degrees F) being blown in from the fan cause condensation on the components inside?
 

Diggrr

Underwater Senior Member
Joined
Nov 29, 2001
You may get condensation on the pelt itself (use a potted unit only), but I doubt condensation would be a problem on the components inside the case. Really, you'll only be dropping the air temps, and not directly cooling the components themselves.
This would work much like the gents who vent outdoor (winter) air into their cases. The components remain above room temp, but the cooler air cools them better. No condensation concerns there.

I understand now about the unit being external, I guess I was a little 'thick' on understanding the pic.:D
 
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EBFoxbat

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I had never heard of people venting winter air into their cases. Now that you have told me that they have no condensation problems I feel much better. I'm not sure if I should expect it to help very much, but I would think, logically, that bring cooled air into they case, would allow it to absorbe more heat before it left the blow holes. Then again maybe I should just put a huge fan in the front and a huge one in the back.....make my case a wind tunnel.......that way the case doesn't have time to get hot... lol
 

Diggrr

Underwater Senior Member
Joined
Nov 29, 2001
I saw on somewhere on the net, the guy used a pony keg (1/4 barrel for beer). He made a side door on it for placing all the components, and mounted a 10" fan in each end....WOW! talk about a windtunnel!
 

rossd

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Nov 16, 2001
Location
Silicon Valley California
You can find out just how cold it will get under no-load conditions by looking at the manufacturers website for the pelt.

Of course, if you blow air across it, it will get warmer. But I'd guess that you could blow a lot of air before it gets too bad. Use a big heatsink.

rossd.