Stacking 156W & 172W tecs????

[Nohto]

Which tec should be twoards the cold plate and which should be on top? I am using a 156w 12c 50mm and a 172w 24v 40mm tec with a watercooled block coolant @ -15c. I am going to try the 156w cooling the 172w and have the 172w in contact with the coldplate. Is this the correct method???

[Teus]

CORE || coldplate || 156W TEC || coldplate || 172W TEC

I'd use only the 172W TEC, because the 172W TEC has to cool both the 156W TEC and the CPU/GPU so 172W isn't enouh

[Nohto]

Oh yeah, it's for a 9800XT

[Teus]

a single 172W will do :)

[Nohto]

No, actually it won't. If I let it run without the PC on it will get to a temps of about -15F, if I remember correctly. By the time I finish with 7 tests, the temp is up in the 50"s.

[Teus]

that's because your pelt is not cooled well enough

[Soulburner]

Yup your pelt is being overloaded with the heat and it can't remove it all.

Need to cool it better.

[Nohto]

I am cooling it with a Z-4 block. The coolant temps are -15C and I am using a 750GPM pond pump. I don't really know how I am suppose to cool it much better than that. Any suggestions. That block has 1/2 in barbs, is solid copper, and has a silver plating on it. Mr Icee has used them. I would have to put in the top 10 as far as cooling capacity.

[Soulburner]

Well something isn't right, your temps should never reach into the 50s.

I have read that TECs get inefficient at low temps.

Using just straight water wouldn't even let the card get that warm, maybe 10-15c max.

[Teus]

-15°Cwater, is that with the pelt or without?

[Nohto]

-15 is the coolant temperature. The pelt has nothing to do with the coolant temperature, unless you are measuring it after it has went thru the block.
The temps I am reading are off the backside of the Vid card and are measured in Farenheit not Celcius. so 15c is 59F.

[Nohto]

CORE || coldplate || 156W TEC || coldplate || 172W TEC
What is the purpose of using a coldplate between the 156 and 172? The only reason I see is that the 156 is bigger than the 172. I was going to try it like this
Core || coldplate || 156 || 172 || block
The 172 is a 24v pelt that I am going to try at 12v along sith the 156. I have a 24v PSU I can try, but I found that it actually gives better temps at around 13v. I don't have an adjustable 12v supply so changing the voltage to the 156 without going thru changes isn't an option.

[]JR[]

You cant stack them tecs and run the at full power. It wont work.

Just use the 172w on its own, or nothing (since you have chilled water).

Youll need to run the 172 @ 17v at least aswell else it wont cope with the heatload.

172watts refers to the amount of heat pumped at vmax, when dT drops to 0 i.e. making the tec pointless.

In your setup @ 12v tec power and -15c coolant, your tecs total heat pump capacity is ~60watt on an ~55watt heatload. My simulator tells me you should expect ~-10c coldside temps.

Infact no voltage on a 172watt tec will give you a better result than just -15c chilled water on a 55w heatload. You may aswell just remove it.

]JR[

[NitroRat]

What are the water temps of your chilled water when you have the system loaded, they must be going up also. Check temps of the chilled water going to pelt while you are under load if they are still in the negatives I'd say you got a bad pelt...

[Nohto]

Originally posted by ]JR[
You cant stack them tecs and run the at full power. It wont work.

Just use the 172w on its own, or nothing (since you have chilled water).

Youll need to run the 172 @ 17v at least aswell else it wont cope with the heatload.

172watts refers to the amount of heat pumped at vmax, when dT drops to 0 i.e. making the tec pointless.

In your setup @ 12v tec power and -15c coolant, your tecs total heat pump capacity is ~60watt on an ~55watt heatload. My simulator tells me you should expect ~-10c coldside temps.

Infact no voltage on a 172watt tec will give you a better result than just -15c chilled water on a 55w heatload. You may aswell just remove it.

]JR[

Ok, so if I run it at 17v, than what will my capicity be?

[sandman]

You aren't cooling the water enough.......

[NitroRat]

-15 is the coolant temperature. The pelt has nothing to do with the coolant temperature, unless you are measuring it after it has went thru the block.

if I remember correctly. By the time I finish with 7 tests, the temp is up in the 50"s.
Dude if you think about it add the heat in the water as it goes into the pelt now add the heat that the pelt makes then add the heat that the processor is putting out and add it all up and throw it back into the coolant ...
What are you chilling the water with a small fridge ?
You need something in the 100-150 watt at -10 c range so you have to be looking at a 1/5 horsepower compressor or larger cooling your water,if its not that big thats the reason for your increase in temps, and you can stack all the pelts you want, your just going to multiply the problem and fry you gpu.

[Nohto]

Dude, I have a thermometer in the 25 GALLONS OF COOLANT . After running it for about 2 hours now, my coolant temp is -14.9C. This is just the waterblock. Running just the waterblock doesn't even come close to the temps of running just the 172W. The 172W by itself produces the best results, but those just aren't good enough. Guess, I'll have to put my Baker blocks to use, since I have had them sitting here for a couple of months now.

[NitroRat]

OK now lets get this right, you have used both the 172 watt and the 150 watt pelt, on separate occasions, on a 9800 XT with coolant at -15c and you gpu temps goto 50c, and at no time is your coolant as it enters the gpu block above -10c . What volts is your 172 watt pelt supposed to run at ,24 volts? If it is you have removed all nuts from your pelt, just run the coolant.

[NitroRat]

and with water temps of -14c with just a waterblock tells me nothing, what are the coolant temps under load with the pelt on it...

[Nohto]

Originally posted by NitroRat
OK now lets get this right, you have used both the 172 watt and the 150 watt pelt, on separate occasions, on a 9800 XT with coolant at -15c and you gpu temps goto 50c, and at no time is your coolant as it enters the gpu block above -10c . What volts is your 172 watt pelt supposed to run at ,24 volts? If it is you have removed all nuts from your pelt, just run the coolant.
Where to start. I never said I have run the 156W on the 9800xt by itself. I never said my GPU temps go to 50c. My volts on the 172w 24v 40mm tec are anywhere between 13.6 (what my 12v power supply runs) to 27v (what my meanwell PSU supplys) the meanwell is adjustable from about 17v to 27v. I found that running the pelt at 13.6 gave the best produced temps. If my PSU was adjustable to say 15v or so it would probably work even better, but since it isn't there is no point in going there.

[Nohto]

Originally posted by NitroRat
and with water temps of -14c with just a waterblock tells me nothing, what are the coolant temps under load with the pelt on it...
I don't know what the actual coolant temps are inside the block when it is under a load. I know that the coolant going into the block is -15c, but I have never measured them as they exit the block. This wouldn't really matter anyway, because I can't control what the exit temps are, just what the enter temps are. Why would you care what they are anyway? Unless you had :banana::banana::banana::banana::banana:ty contact on the GPU and then of course they would be substantially lower.

[NitroRat]

the temp is up in the 50"s.
you did say this and we are just trying to help you.
What is cooling your water ...
When you are running a 24 volt pelt at 13 and get better results this is an example of a pelt that is overheating your coolant...

[Nohto]

If the pelt was overheating my coolant, then I would not get better temps using the pelt than when not using the pelt. I am using a 5cuft. freezer with a 30 gal rubbermaid container inside holding the coolant. As far as the 13v issue, it is known that most of the time running the pelt slightly undervolted will result in better temps. Which in my case is a fact. When I use the 24v PSU and run it at 24v my temps increase, but when I turn the voltage down my GPU temps improve.

[iboomalot]

hey Nohto

nice looking Red zx-12r I got one just like it but with Dymag carbons 3 spokes. Also noticed you are in vegas if you see D-mann (derrick) tell him to give Randy from okla city a buzz and tell him hello.

keep the rubber down and keep that CPU nice and chilled :D

[NitroRat]

When you are running your system under load what is the coolant temp inside the rubbermaid container inside of your freezer... and how did you get a 30 gal container inside of your 5 cubic ft freezer and is the freezer a fridge freezer that sells for 100 bucks and less...

[iboomalot]

there is around 7+ gallons per cubic foot of air space.

[NitroRat]

7.48 but was wondering how he got a container to fit in it.

[iboomalot]

good point lets see some pics if you could

[Nohto]

D-mann (derrick) tell him to give Randy from okla city a buzz and tell him hello.
I am confused. Do I know D-mann? If I do/don't where would I see him. Thanks for the compliment. How do you like the new wheels? Did they make a big difference, and if they did, what were they? Any other mods? I have a powercommander and that's about it, besides having the clutch basket drilled out for proper oil flow. Been thinking about getting a pipe, but have a hard time justifying the $1000 (approx) for an acrapovic or stepped Hindle.

[Nohto]

Originally posted by NitroRat
When you are running your system under load what is the coolant temp inside the rubbermaid container inside of your freezer... and how did you get a 30 gal container inside of your 5 cubic ft freezer and is the freezer a fridge freezer that sells for 100 bucks and less...
The coolant temperature is 15C all of the time. It only increases after about 35min of running under a load, and then it only increases about 1 deg. every 45min.
I pushed hard.
It is a Frigidaire Heavy Duty Commercial Freezer. It was $180.00 if I remember correctly.

[NitroRat]

the second pic looks like your coolant is slush, is it or is from the flash

[NitroRat]

the container fits like a glove...

[Nohto]

The top of the coolant is slush for about 6 inches. The pump is located below the slush, so it doesn't affect it.

[iboomalot]

Originally posted by Nohto
I am confused. Do I know D-mann? If I do/don't where would I see him. Thanks for the compliment. How do you like the new wheels? Did they make a big difference, and if they did, what were they? Any other mods? I have a powercommander and that's about it, besides having the clutch basket drilled out for proper oil flow. Been thinking about getting a pipe, but have a hard time justifying the $1000 (approx) for an acrapovic or stepped Hindle.


D-mann is a one of the top stunt riders in the country and lives in vegas. He is one of the original LVX riders.

you can see his web site at http://www.d-mann.com/

He hangs out all over and on the strip.

Your wheels look sweet. The dymags help alot on lean angle and whipping it into corners.

mods: 1436 cc engine , falicon crank , SuperBikeMike billet big block and JE pistons, 2mm+ throttle bodies, Muzzy-> billet clutch basket - lockup clutch - clutch - adj.cam hubs - timing advancer, pingle wheelie bars, dynaminder/airshifter(co2 powered), Mcpherson adj drop links, dymag carbon wheels, corbin seat, and other stuff Iam forgetting.

I won the 2001 ami horsepower shootout see link import 1001+

http://www.superflow.com/press/ami_results.htm

sorry for being off topic to everyone readin this post.

and ride you got :cool:

[iboomalot]

Originally posted by Nohto
The top of the coolant is slush for about 6 inches. The pump is located below the slush, so it doesn't affect it.

have you tried windshield washer fluid??

if its not a sealed setup might stick with what you got since WWF contains methanol.

[benonmsn]

i dont think my air cooling on my 9800 pro at 500 / 395 reaches 50c.... soemthign with ur setup aint right

[Nohto]

Neither does mine. 50F