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Delta-T "Load" Temps - Questions - Page 3

post #21 of 29
I went throught painstaking efforts to explain how to improuve your delta T and I explained why. You didnt listen to any of it, in fact you did the exact opposite.

My help will not improuve your delta because you are not doing what I explained.

You got 10 fans pulling air into the box and only one fan taking air out: your rads can't breath.

You are taking rad air, exhausting it below for the rads to suck it all back in: you are not giving your rads fresh air.

It seems you just dont beleive a thing I tell you. So I suggested a little easy test that would prouve me right and increase your delta. But you didnt do the easy test and even if you did, any improvments could be attributed merely to your having changed your thermometer.

Over and out.
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post #22 of 29
Thread Starter 
If my rads couldn't breathe my temperatures wouldn't be as good as they are. Of course in theory, having 10 fans intaking and one exhausting would suffocate the radiators, but Im not seeing this effect in my temps. Ask anybody who runs dual 7970's on water what their GPU temps are during mining and if 50-51'C is a really good load temperature.
Could the temps be better? Not by more than a degree or two. After running the two GPU's at full load for *nine hours*, I'm seeing a Delta-T of 9°C (water temps seem to plateau at 37°C regardless of heat load, but you'll attribute this to switching sensors I'm sure.
I appreciate the help you provided but I never asked you to put any extraordinary effort into this thread. Again I do appreciate your help and will report back what my temps are after trying your suggestion of laying my case on its side, but try to keep the negative comments to PM please.
post #23 of 29
Quote:
Originally Posted by joesaiditstrue View Post

edit: I ran a spare temperature probe to the outside of my case (away from any heat producing components or fans)

Good, now just make sure that your rads are doing the same thing: taking air "away from heat producing components" i.e. the floor, and not recycling hot air rising.
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post #24 of 29
Thread Starter 
Unfortunately I didn't put the case on the floor for this test, but I followed all of your other suggestions. I would've had to move my side-desk and rearrange a bunch of cables in order to fit it on the ground, laying flat. And of course my temps would be better on the ground, even standing up due to the fact that the ground is colder of course.
post #25 of 29
When you started this thread, your old thermometer recorded a 17c delta.
After you changed you rad configuration, your rads were no longer sandwiching (good), but you are now recycling hot air by pushing it down and letting it rise to be sucked back in again (bad). Furthermore you are suffocating your rads with no room to exhaust (bad).
Then you reported very little change in your delta, I'm not surprised.

So you changed your thermometer. And now you see an improuvement.
The only thing that changed is the thermometer.

You should not chage delta measuring procedure in the middle of it all, please keep using the same method and equipment you were usingpreviously.
Quote:
try to keep the negative comments to PM please.
What negative comment? I think you see negativity in my words where there is none.I'm talking science and logic here. Why would that offend you?

Anyway, if it offends you, I'll just move on then.

Cheers cheers.gif
Edited by PepeLapiu - 1/26/13 at 11:34am
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post #26 of 29
Quote:
Originally Posted by joesaiditstrue View Post

Unfortunately I didn't put the case on the floor for this test, but I followed all of your other suggestions. I would've had to move my side-desk and rearrange a bunch of cables in order to fit it on the ground, laying flat. And of course my temps would be better on the ground, even standing up due to the fact that the ground is colder of course.

Okay, very good. At this point I dont know if my contributing here is offending you or not.
So, in this video, what was your delta using your old measuring method with your old thermometer?
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post #27 of 29
Thread Starter 
Quote:
Originally Posted by PepeLapiu View Post

When you started this thread, your old thermometer recorded a 17c delta.
After you changed you rad configuration, your rads were no longer sandwiching (good), but you are now recycling hot air by pushing it down and letting it rise to be sucked back in again (bad). Furthermore you are suffocating your rads with no room to exhaust (bad).
Then you reported very little change in your delta, I'm not surprised.

So you changed your thermometer. And now you see an improuvement.
The only thing that changed is the thermometer.

You should not chage delta measuring procedure in the middle of it all, please keep using the same method and equipment you were usingpreviously.
What negative comment? I think you see negativity in my words where there is none.I'm talking science and logic here. Why would that offend you?

Anyway, if it offends you, I'll just move on then.

Cheers cheers.gif

Watch the video, I still show the old thermometer. Oddly enough it's now showing the same temperature as my thermal probe. So ambient is being recorded correctly by two separate instruments
Quote:
Okay, very good. At this point I dont know if my contributing here is offending you or not.
So, in this video, what was your delta using your old measuring method with your old thermometer?

Reversing the 360 fans (as well as including an exhaust fan) seems to have lowered my Delta-T. Earlier you posted that the rads would be suffocating with only one exhaust. This is actually incorrect, as the air would find its way out of the case in the other openings/holes throughout the chassis. The exhaust fan (while only one) provides enough exhaust to keep the temperatures as low as they will go (as evidence by the video using your "lay flat" suggestion)
Edited by joesaiditstrue - 1/26/13 at 11:42am
post #28 of 29
So you now have a lower delta. Great ! thumb.gif
But to me, a 13c delta is still to high for my taste with the amount of raddage you have. Something just isnt right here and I dont see it. But hey, your delta has improved! Just not as much as I think it should and I am completely at lost here as to why. frown.gif
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post #29 of 29
Wont the Delta T also depend on fan RPM, as in how many watts the rads can dissipate at a specific RPM.

I run the Switch 810 and have an RX360 in the roof exhausting air and an RX240 in the bottom pulling in air, however I have two 140mm Bitfenix fans pulling in fresh air in through the front of the case, and I reversed the flow of the Rear Exhaust (making it intake) to get in even more fresh air. Whatever warmer air is being put into my case from the bottom 240 I don't think its having much of an effect on the 360 in the roof after pouring in much cooler air from outside.

I haven't put any sensors in my loop yet, but I'm planning too in the future. Got some more components going in and need to strip her down at some point anyway. But going by my operating temps its not too much of a problem, another thing I'm thinking of doing is reversing the flow in my loop so the warmest water goes to the 360 in the roof, atm its going to the 240 in the bottom. My thoughts are that by going through the 360 first (roof) the water will be a degree or two cooler when it hits the 240 rad and I'm hoping that means that the air coming out of it isn't perhaps as warm as it was when it had the warmest water the loop was producing.

Hope that makes sense, and hope that my theory makes sense also with regards to alternate flow wink.gif
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