Is water-cooled THAT good? - Page 4 - Techist - Tech Forum

 Techist - Tech Forum Is water-cooled THAT good?
 Register FAQ Members List Calendar Search Today's Posts Mark Forums Read

 07-07-2006, 01:24 PM #31 (permalink) MechEng Extraordinaire   Join Date: Apr 2006 Posts: 1,027 Reynolds number=(density*velocity^2*hydrolic-diameter)/viscosity. Prandlt number=viscosity*Cp/Thermal conductivity Prandlt, Nusselt, reynolds, schmidt, as well as many other numbers interact algebraicly Heat transfer increases proportionally with Reynolds number, but also with viscosity. its a tricky topic as to which to use, distilled water or antifreeze. the distilled water flows faster because it has a lower viscosity. the lower viscosity raises the reynolds number of the fluid across the waterblock(hydrolic diameter is associated with the geometry of the waterblock). reynolds number increases inversly with viscosity, but heat transfer increases directly with viscosity and reynolds number. Antifreeze, although handicaped by its lower reynolds number, it's higher viscosity causes more friction with the radiator and tubing walls causing greater heat transfer out of the system. it is quite complicated... to learn more, google fluid mechanics, convection heat transfer, reynolds number, nusselt number, prandtl number... it goes on. the Cp, or specific heat capacity, of water is higher than that of antifreeze (ethylene glycol/water mixture) and so the water is capable of carrying more heat in it with less of a temperature change of the fluid. and as we all know, heat transfer is driven by temperature differences! this means that you may need a larger reservior if you are going to use antifreeze. as you can see, the same things that advantage one in a certain respect will also detract from it in another. it is quite a design problem... i gotta stop typing and get back to work... designing heat exchangers, curiously enough __________________ __________________ Change the world upgrading... PS3 -> Folding as we speak Team# 64582
 07-07-2006, 03:56 PM #32 (permalink) True Techie   Join Date: Mar 2006 Posts: 154 you definetely do NOT want to run regular anti-freeze/coolant made with ethylene glycol, as said, the viscosity is significantly higher than what this equipment was made to run, and can really cause problems with buildup, especially in the more popular/higher performing impingement water blocks. There simply is not a better solution than distilled/deionized water at the moment, there have been numerous other things tested, and they all had significant drawbacks. I would also recommend against MCT-5, besides it being a lower performing liquid to use in the loop, the main point of MCT-5 is that "it won't fry your equipment" which just isn't true.. MCT-5 is just as likely to fry your hardware as Distilled/DI, there have been casualties and survivor stories on both sides, the difference is one of these doesn't cost 100+ dollars to fill most loops. __________________ __________________ [SIZE=\"1\"][COLOR=\"Red\"]Case:[/COLOR][COLOR=\"Black\"] MountainMods U2-UFO[/COLOR] [COLOR=\"Red\"]PSU:[/COLOR][COLOR=\"Black\"] PCP&C 1kW EPS12V[/COLOR] [COLOR=\"Red\"]Motherboard:[/COLOR][COLOR=\"Black\"] ASUS P5NSLI[/COLOR][COLOR=\"Blue\"] (Yeah, I know!)[/COLOR] [COLOR=\"Red\"]Processor:[/COLOR][COLOR=\"Black\"] Retail Core 2 Duo X6800[/COLOR][COLOR=\"Blue\"] Week 26/B2[/COLOR] [COLOR=\"Red\"]RAM:[/COLOR][COLOR=\"Black\"] 2x1GB OCZ Platinum Rev.2 DDR2-800[/COLOR] [COLOR=\"Red\"]VGA:[/COLOR][COLOR=\"Black\"] 1x eVGA 7950GX2[/COLOR] [COLOR=\"Red\"]Sound Card:[/COLOR][COLOR=\"Black\"] SB X-Fi XM[/COLOR] [COLOR=\"Red\"]HDD:[/COLOR][COLOR=\"Black\"] 2x Raptor 150GB in RAID 0/1x 500GB WD Caviar[/COLOR] [COLOR=\"Red\"]Optical:[/COLOR][COLOR=\"Black\"] Plextor DVD-R DL PX-716AL[/COLOR] [COLOR=\"Red\"]Speakers:[/COLOR][COLOR=\"Black\"] Logitech z-5500[/COLOR] [COLOR=\"Red\"]Fans:[/COLOR][COLOR=\"Black\"] 9x YL D12SM-12[/COLOR] [COLOR=\"Lime\"]Water-Cooling:[/COLOR][COLOR=\"Black\"] MCP355 w/AlphaCool top/PA120.3/AQX MP-05 SP LE/Silverprop Cyclone NexusSX chipset block[/COLOR] [/SIZE]
 07-07-2006, 04:12 PM #33 (permalink) Ultra Techie     Join Date: Oct 2005 Posts: 896 http://svc.com/fxphprf32.html Finally decided on this coolants. I don't feel like going around looking for dyes and the perfect coolant etc. This seems like a good choice. Going to wash out everything in my loop with distilled water and vinegar. Run the system with distilled water. Drain it, and pour in the coolant to make sure my loop is clean enough. I was thinking of getting a temperature indicator for my loop. Would the water be as hot as the CPU? (Only thing I am cooling in my loop) I know how inaccurate the mobo indicators are. __________________ __________________ e6300@2.8GHZ G. Skill 4GB(2x2GB) DDR800 eVGA 8800GTS 320MB super pi: 1m=20s

 Thread Tools Display Modes Linear Mode

 Posting Rules You may not post new threads You may not post replies You may not post attachments You may not edit your posts BB code is On Smilies are On [IMG] code is On HTML code is OnTrackbacks are On Pingbacks are On Refbacks are Off Forum Rules

#### Our Communities

Our communities encompass many different hobbies and interests, but each one is built on friendly, intelligent membership.

#### Automotive Communities

Our Automotive communities encompass many different makes and models. From U.S. domestics to European Saloons.

» More about our Automotive Communities

#### Marine Communities

Our Marine websites focus on Cruising and Sailing Vessels, including forums and the largest cruising Wiki project on the web today.

» More about our Marine Communities