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watercooling + paste
Halfgaar wrote:
David Maynard wrote: I didn't have one either, till recently. I had always thought one would be 'nice' but just never forked over for one. Now I can't imagine why I waited so long. I got my "rotary tool" from Sears during a sale but these people have an inexpensive job (plus other cheap tools) with some nifty accessories. http://www.softwareandstuff.com/tol_elerotkit.html I don't know how good it is but 30 bucks for all of that is an impressive deal. Figure on spending another $10 to $20 for various bits, cutting discs, etc, depending on what projects you dream up. (Sears stuff should fit, and is convenient, as they all use the 1/8" arbor) Something like it would be convient, but I don't really need it all that often. And software and stuff probably don't delive outside the US (and I don't like ordering things online ) They probably don't. Too bad because they have interesting deals from time to time. Halfgaar |
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Nick M V Salmon wrote:
"Halfgaar" wrote David Maynard wrote: Just a moment there. I didn't say one or the other was 'better'. I was talking about how ducting the fan worked and that's there's more to it than simply putting the fan in either the front or back. Sorry, I misinterpreted. I can't really find who said it, but someone did. [UK[_Nick wrote it, ie. me, sucking is better - assuming the same temperature inlet air. I'll explain the reason for it again too; Air spins outward from the outlet of a fan - if it is blowing through a radiator then the vast majority of the air travels through the outer edges of the radiator alone. If a fan is sucking through a radiator then you get a roughly equal amount of air travelling through the whole area of the radiator. That is true but the fly in the ointment is that axial fans can't pull against pressure as well as they can push into it (which isn't much to begin with). The upshot is that, depending on how much restriction there is, the air distribution will probably be better but the airflow will be less. If you just 'feel' to compare the air flowing through a radiator when sucking or blowing then you'll get the impression there's a stronger draft when blowing because there _is_ a stronger draft, but it's all concentrated at the outer edges of the radiator. I've tried it both ways and 'sucking' seems to win BUT, by far the more important point is - how hot is the inlet air..? A radiator can only radiate into colder air thus air already pre-heated by the rest of the components in a computer, or coming from a relatively hot place in a room, isn't much use... Ciao... [UK]_Nick... |
#3
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Halfgaar wrote:
Halfgaar wrote: Before I close this thread, I'd like to point out something to you Nick: You can find this on the Innovatak (manufacturer of my radiator) site (the site is german, this is world.altavista.com'ed): "The fine lamination of the radiator provides for an optimal heat emission to the cooling air, without obstructing however the air flow substantially. Further the air flow of the fan is optimally used by the integrated Fanhouse, since by this pre-chamber the whole surface of the radiator is flowed around by the cooling air. In addition this measure contributes also to the reduction of flow noises - the radiator is very quiet therefore." This says that the fanduct is meant for spreading out the airflow over the entire radiator surface, preventing a dead spot. Any comments on this ? The noise will be less because the fan blades are further from the irregular radiator surface and so there will be less air beat against it. If it is, in fact, distributing the air across the radiator surface then it would be due to pressure build up on the radiator surface (periphery where the duct contacts it) causing some air to flow toward the lower pressure area in the center and then through the radiator there. However, that (back) pressure is also going to reduce the fan's total airflow. What they're describing resembles an air plenum in front of the radiator with the fan 'pressurizing' it and the plenum pressure then causing air to flow through the radiator. That works best, though, when the fan is smaller than the radiator so that the airflow doesn't have to make drastic direction changes. Halfgaar |
#4
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David Maynard wrote:
That is true but the fly in the ointment is that axial fans can't pull against pressure as well as they can push into it (which isn't much to begin with). The upshot is that, depending on how much restriction there is, the air distribution will probably be better but the airflow will be less. I think I'll call an end to this thread . I've gotten some usefull advise. And I made some changes. Then fan is now sucking in air from outside the case trough a 1cm long fanduct, blowing it through the radiator. I've tested this configuration before, but without the intake fanduct. The intake fanduct seems to help both in decreasing noise as well as increasing airflow. The intake fan pressed directly against the metal intake filter is apparently a bad idea. These are my temps after hours of use (mostly Idle BTW): Rad. Fan: 1454 RPM (min = 998 RPM, div = 8) CPU Temp: +41.6°C (limit = +63°C, hysteresis = +60°C) Sys Temp: +32.1°C (limit = +41°C, hysteresis = +40°C) The best I've had with the current room temp (25 degrees C). The radiator feels quite cold, so I guess I should try some different thermal paste (the paste question was infact the start of this thread...., whether different paste would make a difference....) Anyway, thanks to everybody for your input. Halfgaar -- To send email, change nospam.com into yahoo.com. |
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