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Delta-T "Load" Temps - Questions - Page 2

post #11 of 29
Thread Starter 
Gonna flip the top 360 fans inward as I don't want extremely loud fans blowing in from the floor and rear. I'll have floor/rear fans exhaust and both rads intaking so I'll have positive pressure as well
post #12 of 29
That should work a lot better. I had the same problem in my Bitfenix Raider with a 240 front and 360 top. I found the best delta in mine by having both intaking.
Report back with what happens.
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post #13 of 29
I think you would net better results (slightly) by have both rads push air out. But even if they pull in air, you still will get better temps over current temps.
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post #14 of 29
Quote:
Originally Posted by PepeLapiu View Post

I think you would net better results (slightly) by have both rads push air out. But even if they pull in air, you still will get better temps over current temps.
What's your logic behind suggesting lower temperatures will come by pushing air out over pulling air in? My tests have shown lower temperatures from having radiators pull air into the case, since the air outside the case is slightly cooler than the air in the case.
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post #15 of 29
Hot air rises. So if it is pulled in from top and front, then exhausted out the floor and back, as it comes out, it will rise and get sucked back in by the rads again. So if you want to pull in fresh air with your rads, do it from the floor and front (or floor and back).

Having said that, with the top and front pulling in air, you still will get better temps then recycling rad1air into rad2.

Besides, once you have your cpu and vga under water, your case won't be heating up nearly as much as when air cooling.

It's all about 3 simple rules:
- rads produce warm air
- warm air rises
- rads don't like warm air.

Now, about the components producing warm air to the rads. This is really a tits for tats issue. You can feed your warm case air to your rads, which your rads won't like. Or you could push your warm rad air onto your components, which your components won't like. Either way, you just have to flip a coin on this one.

Or you could buy an 800$ Caselabs case with separate rad chambers.
Edited by PepeLapiu - 1/24/13 at 10:09pm
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post #16 of 29
Thread Starter 
Quote:
Originally Posted by PepeLapiu View Post

Hot air rises. So if it is pulled in from top and front, then exhausted out the floor and back, as it comes out, it will rise and get sucked back in by the rads again. So if you want to pull in fresh air with your rads, do it from the floor and front (or floor and back).

Having said that, with the top and front pulling in air, you still will get better temps then recycling rad1air into rad2.

Besides, once you have your cpu and vga under water, your case won't be heating up nearly as much as when air cooling.

It's all about 3 simple rules:
- rads produce warm air
- warm air rises
- rads don't like warm air.

Now, about the components producing warm air to the rads. This is really a tits for tats issue. You can feed your warm case air to your rads, which your rads won't like. Or you could push your warm rad air onto your components, which your components won't like. Either way, you just have to flip a coin on this one.

Or you could buy an 800$ Caselabs case with separate rad chambers.

Hot air does rise, but you're talking about the distance the air has to rise in literally less than two feet vertically, it wouldn't make a noticable difference (this is speculation on my part)

I flipped the 360 fans, so all of my fans are intaking air and I have a powerful 140mm NZXT exhausting air (I have a speedfan profile setup so the NZXT fan is always running at a higher RPM than the fans on each RAD, as it has to exhaust enough air for 2 radiators)

My temps aren't really that different so far. It's really cool in my PC room (~16'C), and I'm running my Bitcoin Miner (both GPU's overclocked to 1200), and my Coolant temperature is 32'C, so almost exactly the same as it was before

Once my room temperature increases, we'll see if the coolant remains constant at 32 (which would thus drop my Delta-T), or if it hasn't stabilized yet and thus will keep my Delta around 16'C-17'C

edit: I ran a spare temperature probe to the outside of my case (away from any heat producing components or fans) where it's just picking up an ambient temperature, and it's reading about 5'C higher than my old run of the mill mercury thermometer which might just be old an inaccurate

going off the temp probe, my Delta-T is now 13'C (34'C Coolant - 21'C Ambient)

Edited by joesaiditstrue - 1/25/13 at 1:46am
post #17 of 29
Very well, now we are going to try an easy test. But you have to do exactly as I explain.

Put your case on the floor, if it's not already there.
Lay your case on it's right side in such a way that your side door is facing up.
Open the door of your case wide open.
Make sure the flow to your rads is completely free, making sure they can suck air without restrictions.
Now do your Bitcoin Miner again and let me know what your delta is.

Dont change temperature recording now. Whatever methods you were using previously, keep that same method to be consistant.

Edit: and please let it run that stress tet for at least 20 mins with the case on the floor, on it's side, with the case door wide open.

Cheers
Edited by PepeLapiu - 1/25/13 at 6:58am
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post #18 of 29
Just to verify, you are calculating your delta T as follows:

(RadWIn + RadWOut)/2 - (Air1 + Air2)/2 = Air/Water Delta T

Air temp varies greatly by location (made up of pockets of different temperatures), so I can't see you getting accurate readings without at least averaging two sensors. Your water temp is the average between the hottest and coolest points of water.
post #19 of 29
Quote:
Originally Posted by Electrocutor View Post

Just to verify, you are calculating your delta T as follows:

(RadWIn + RadWOut)/2 - (Air1 + Air2)/2 = Air/Water Delta T

Air temp varies greatly by location (made up of pockets of different temperatures), so I can't see you getting accurate readings without at least averaging two sensors. Your water temp is the average between the hottest and coolest points of water.

Yeah, I agree with you here. But with his method, he calculated the delta T to be 17c. So let's see if we can improve that 17c before we change the formula. If we change the way his delta T is calculated now, any change could indicate calculation changes, not actual loop improvment. So lets be consistant.

So joesaiditstrue, dont move your temp sensors around just for now, just use the same method and sensors as you used to get that 17c delta.
Only AFTER we've improuved your delta as you calculate it, we can look to change formulas and sensor placement.

Please do the little test I suggested in my post above. I think you will be surprised at the results.
Edited by PepeLapiu - 1/25/13 at 11:59am
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post #20 of 29
Thread Starter 
well as I edited in my last post, my Delta-T is fluctuating between 13° and lower due to previously using an inaccurate thermometer
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