|
|
General Liquid/Water Cooling Discussion For discussion about Full Cooling System kits, or general cooling topics. Keep specific cooling items like pumps, radiators, etc... in their specific forums. |
Thread Tools |
03-31-2005, 09:47 AM | #1 |
Cooling Neophyte
Join Date: Feb 2005
Location: England
Posts: 28
|
Radiators & Airflow
120:3 rad
3 x Xinrullian pushing 92 CFM MCP600 @ 13.6V Swiffy 6002 Fusion HL All 1/2" (a little shy of 10ft of tubing all in) running ... Res > Pump > Rad > CPC quick Connect > 6002 > HL > CPC quick connect > Res The reason I mention the CPC connectors are because they are self sealing and so inhibit flow somewhat, don't know if thats a factor here or not...Anyway, onto the questions... Running the fans at roughly half speed on my fan controller, is it fair to assume that half speed = half the rated airflow?? Either way, airflow is much reduced but when turning the fans up to full, the temps do not improve any, not even by a degree. Now, I guess there must be a point at which no matter how much air you throw at a rad it won't go any lower, so am I at that point with the fans on the low setting?? I'm sure that flow rate, ambient temps and many other factors will affect that, I guess I'm also after an idiots explaination as to the relationships between these things, or a pointer to some articles. Or am I missing something more fundamental here? Even my humble exos can dent the temps by 1 degree by turning the fans up to full. |
03-31-2005, 11:40 AM | #2 |
Cooling Savant
Join Date: May 2003
Location: Okotoks, A.B. Canada
Posts: 726
|
there is a temperature change from having your fans at 1/2 speed to full speed but the diffrence is minimal.
smaller then what you can acurately measure I'm guessing. my 2ยข
__________________
"Great spirits have always encountered violent opposition from mediocre minds" - (Einstein) |
03-31-2005, 12:55 PM | #3 |
Cooling Neophyte
Join Date: Jan 2005
Location: Houston
Posts: 34
|
Roughly speaking, half the voltage does usually end up being half the airflow. That relationship usually falls apart below half voltage though. If increasing airflow does not decrease operating temps, that means the cooling bottleneck in your system is not the radiator. In other words, regardless of airflow, the radiator has reached a plateau in efficiency given the current system components.
|
04-02-2005, 03:01 AM | #4 |
Cooling Neophyte
Join Date: Feb 2005
Location: England
Posts: 28
|
So, I've either hit the sweet spot for my gear first time, or theres improvements to be made elsewhere in the set up.
Interesting. I'd suspect flow rates are being hit by the CPC connectors, I'd hoped to compensate for that a little by running at the higher voltage. Gives me something else to play with for a while |
04-02-2005, 03:53 AM | #5 |
Cooling Savant
Join Date: May 2003
Location: Okotoks, A.B. Canada
Posts: 726
|
any pictures?
__________________
"Great spirits have always encountered violent opposition from mediocre minds" - (Einstein) |
04-02-2005, 05:07 AM | #6 |
Cooling Neophyte
Join Date: Feb 2005
Location: England
Posts: 28
|
On the test bench...3/4 rear shot
In situ and running... The side mounted LCD gives me a temps readout from MBM5 |
04-02-2005, 06:35 AM | #7 |
Cooling Savant
Join Date: Sep 2002
Location: Cincinnati, OH
Posts: 229
|
Looks good...
Yes, many variables affect final temp - radiator airflow is only one. IMHO, if you are not seeing any measurable change in temps when slowing the raddy fans down by roughly half, then the radiator system is not the limiting factor in your cooling system. Something else, such as overall flow rate, is holding you back. Try measuring your system flow rate: connect a large (constantly filling reservoir to mainatain constant level), disconnect your return line and measure how long it takes to fill a 1 gallon (or 5 gallon) bottle => GPM or GPH (or liters if you prefer) |
04-02-2005, 07:47 AM | #8 |
Cooling Neophyte
Join Date: Jan 2005
Location: Houston
Posts: 34
|
That's a nice setup, very clean and functional. What CPU, video card etc are you running? You may not be dumping enough heat into the system to really tax it. If I had to guess, I would say you're running near the peak efficiency of your waterblock, which puts you in the flat part of the curve in this graph:
Your pump can push over 2.9 GPM with no head, so even if we figure you have enough resistance to drop your flow rate to 1.5 GPM, for instance, you still wouldn't see much of a difference (less than .5 degree). Thus I don't think the pump is the problem, and the rad probably isn't either, given your results with fan speed changes. That means that given the amount of heat your hardware is producing, the bottleneck in your system is probably the MCW6002, which is a pretty good bottleneck to have, given its performance numbers. |
04-02-2005, 08:01 AM | #9 |
Cooling Savant
Join Date: May 2003
Location: New Smyrna, FL
Posts: 258
|
What's your dT air/water at load?
|
04-02-2005, 09:05 AM | #10 | |
Cooling Neophyte
Join Date: Dec 2002
Location: Twin Cities
Posts: 67
|
Quote:
Hoot
__________________
DFI LP UT NF4 Ultra-D 7.04-3 Bios A64 3700+ San Diego 11x257 (2827 Mhz) @ 1.57Vcore 2x1Gb Crucial Ballistix 7:6 (300 Mhz) 3-3-3-8-1T @ 2.77V Connect 3D x850xt 620/625 2x WD 36GB Raptors in Raid0 DIY Jet Impingement WB on CPU / Pipecap WB on GPU Shrouded Camaro Heater Core / Swiftech MCP655 Pump Antec P-160 Tower / Seasonic S12 600W PSU MAXIM 6658 Thermal Diode Reader Moderator at OCForums |
|
04-02-2005, 09:22 AM | #11 |
CoolingWorks Tech Guy Formerly "Unregistered"
Join Date: Dec 2000
Location: Posts: 2,371.493,106
Posts: 4,440
|
and I would note that Hoot has a very temperature stable room in which he tests
got to have a baseline |
04-02-2005, 10:30 AM | #12 |
Cooling Savant
Join Date: May 2003
Location: New Smyrna, FL
Posts: 258
|
I was thinking along the lines of water temp in his circuit vs ambient air. Isn't water temp at any point in a circuit the same (within .5C) regardless of where it is measured?
|
04-02-2005, 11:26 AM | #13 |
Cooling Neophyte
Join Date: Dec 2002
Location: Twin Cities
Posts: 67
|
I'd speculate that is true for the most part with systems having a reasonable flow rate. Something in the .5-1.0C range. I just ran downstairs and checked mine with my Fluke and Type K sensors and they're running 22.0C out of the Radiator and 22.8C into it. That's using the setup in my sig and running Prime95 Torture In-Place Large FFTs fixed at 896k. FWIW, the core is reading 43C.
BTW, nice workmanship on the external heat exchanger. Hoot
__________________
DFI LP UT NF4 Ultra-D 7.04-3 Bios A64 3700+ San Diego 11x257 (2827 Mhz) @ 1.57Vcore 2x1Gb Crucial Ballistix 7:6 (300 Mhz) 3-3-3-8-1T @ 2.77V Connect 3D x850xt 620/625 2x WD 36GB Raptors in Raid0 DIY Jet Impingement WB on CPU / Pipecap WB on GPU Shrouded Camaro Heater Core / Swiftech MCP655 Pump Antec P-160 Tower / Seasonic S12 600W PSU MAXIM 6658 Thermal Diode Reader Moderator at OCForums |
04-02-2005, 11:38 AM | #14 |
Cooling Neophyte
Join Date: Feb 2005
Location: England
Posts: 28
|
Current spec is...
XP-M2500 217 x 12 = 2604 @ 1.75V 9800Pro @ 433/370 I can't really give you any figures for dt or even ambient tbh, ambient tends to jump about a bit in this room. However, had a little scare this morning. Just browsing forums and had a reboot, a quick glance at the temp display showed 45c....not too alarming but curious as I had been at a steady 38c. Another glance at the radbox showed the pump power had cut off! 1 quick shutdown later and it was back to the bench for some investigation. To cut a long story short, the PSU I filched out of work was duff The upshot being the pump may have been running at below 12V, so it was back to the workshop to aquire another. A bit of testing/refitting later and it's back on. I'm just waiting for it to get a good warm up before I try the fans again. Update... The pump is now running at 13.8V ok. Temps have remained the same as before at 38/39 idle, 42/43 load as measured by MBM5. Turning the fans to full did decrease the temp by 1c but it took a fair few minutes to filter through. I'm not unhappy with those temps but I did expect them to be better. Maybe my expectations were too high. The only other thing I can try is run without the CPC connectors to increase my flow. Here's a chart of thier pressure drop, maybe someone with better knowledge can interpret it and let me know if it's doing more harm than good?? Last edited by TbirdX; 04-02-2005 at 04:12 PM. |
04-02-2005, 10:04 PM | #15 | |
Cooling Neophyte
Join Date: Dec 2002
Location: Twin Cities
Posts: 67
|
Quote:
Hoot
__________________
DFI LP UT NF4 Ultra-D 7.04-3 Bios A64 3700+ San Diego 11x257 (2827 Mhz) @ 1.57Vcore 2x1Gb Crucial Ballistix 7:6 (300 Mhz) 3-3-3-8-1T @ 2.77V Connect 3D x850xt 620/625 2x WD 36GB Raptors in Raid0 DIY Jet Impingement WB on CPU / Pipecap WB on GPU Shrouded Camaro Heater Core / Swiftech MCP655 Pump Antec P-160 Tower / Seasonic S12 600W PSU MAXIM 6658 Thermal Diode Reader Moderator at OCForums |
|
05-25-2005, 02:52 AM | #16 |
Cooling Neophyte
Join Date: May 2005
Location: Australia
Posts: 1
|
Nice setup there, still got the same?
|
05-25-2005, 08:02 PM | #17 |
Cooling Neophyte
Join Date: Apr 2005
Location: Near frozenCPU
Posts: 55
|
those quick-disconnects look pretty nice. what do they do to flow/where did you get them?
|
08-31-2005, 06:50 PM | #18 |
Cooling Savant
Join Date: Jun 2005
Location: Skokie, Illinois
Posts: 322
|
http://www.omega.com/pdf/tubing/coup...fc12series.asp
I was trolling and knew the source. The spec pictured is for the 3/8" ones. I use the 3/4" W 1/2" ID Tygon R3603. I installed them as TBirdX did. I don't have to drain the system or have two people to move it. They are fairly restrictive, but I think they can be modded to be better although I havn't had time to try. In a system with an Eheim 1048 they reduced flows from 0.91GPM to 0.78GPM. |
09-04-2005, 09:49 PM | #19 | |
Cooling Savant
Join Date: May 2005
Location: US
Posts: 123
|
Quote:
__________________
Intel is the way to go. |
|
Currently Active Users Viewing This Thread: 1 (0 members and 1 guests) | |
|
|