Overclock.net › Forums › Cooling › Air Cooling › Heatpipes......Do they REALLY work?
New Posts  All Forums:Forum Nav:

Heatpipes......Do they REALLY work? - Page 3

post #21 of 37
One thing I will say about a CPU HS is that most are probably manufactured for horizontal use. As 99% of CPU placement is horizontal. So I am sure the calipers inside the heatpipes are fixed for use this way.

pink
post #22 of 37
Nope, they cant be "fixed". Capillaries are used to help gravity. The vf900 is engineered with some really good capillaries, that's why its so expensive and works so well upside down. But when I flipped my case upside down it dropped 10c under load. Mind you that I only ran atitool for 3 min if that compared to the usuall all nighter, because I had to hold 1 fan that usually sits on the bottom of the case pointing at the cards.
    
CPUMotherboardGraphicsRAM
E6850 GIGA GA-P35-DQ6 P35 775 Evga 8800GTX 650/2.0GHZ 2x1G|OCZ DII1066 
Hard DriveOptical DriveOSMonitor
2x320G|Seagate(Raid-0) 1x500G|Seagate 2x LITE-ON|20x Windows XP Chopped SAMSUNG 226BW Black 22" 2ms 
KeyboardPowerCaseMouse
G15 Silverstone DECATHLON 650w 54A Thermaltake Armor Series w/ 25CM Fan G7 
Mouse Pad
XTRAC Ripper 
  hide details  
Reply
    
CPUMotherboardGraphicsRAM
E6850 GIGA GA-P35-DQ6 P35 775 Evga 8800GTX 650/2.0GHZ 2x1G|OCZ DII1066 
Hard DriveOptical DriveOSMonitor
2x320G|Seagate(Raid-0) 1x500G|Seagate 2x LITE-ON|20x Windows XP Chopped SAMSUNG 226BW Black 22" 2ms 
KeyboardPowerCaseMouse
G15 Silverstone DECATHLON 650w 54A Thermaltake Armor Series w/ 25CM Fan G7 
Mouse Pad
XTRAC Ripper 
  hide details  
Reply
post #23 of 37
What I meant by that is when I got ATI Tool 0.25 Beta 14 it showed 35C when 0.24 showed 58C
    
CPUMotherboardGraphicsRAM
Q8400 DFI LP DK P45-T2RS eVGA GTX 650 Kingston 
Hard DriveOptical DriveOSMonitor
2.8TB Total LG Super DVD Burner SATA VII Enterprise x64 Gateway FHD2401 
PowerCaseMouseMouse Pad
Corsair VX550W NZXT Source 210 White Logitech G400 Razer Kabuto 
Audio
Creative Audigy 
  hide details  
Reply
    
CPUMotherboardGraphicsRAM
Q8400 DFI LP DK P45-T2RS eVGA GTX 650 Kingston 
Hard DriveOptical DriveOSMonitor
2.8TB Total LG Super DVD Burner SATA VII Enterprise x64 Gateway FHD2401 
PowerCaseMouseMouse Pad
Corsair VX550W NZXT Source 210 White Logitech G400 Razer Kabuto 
Audio
Creative Audigy 
  hide details  
Reply
post #24 of 37
Thread Starter 
hmmmmm thats odd
My System
(13 items)
 
  
CPUMotherboardGraphicsRAM
Anthalon 64 3000+ Venice Abit KN8 Sli eVGA GeForce 7600GTS 2 Gigs 
Hard DriveOSMonitorPower
2x WD Caviar 80 gig Sata2 XP Pro NEC MultiSyng 1735 Anatec SmartPower 2.0 500 
Case
Thermaltake Soprano 
  hide details  
Reply
My System
(13 items)
 
  
CPUMotherboardGraphicsRAM
Anthalon 64 3000+ Venice Abit KN8 Sli eVGA GeForce 7600GTS 2 Gigs 
Hard DriveOSMonitorPower
2x WD Caviar 80 gig Sata2 XP Pro NEC MultiSyng 1735 Anatec SmartPower 2.0 500 
Case
Thermaltake Soprano 
  hide details  
Reply
post #25 of 37
It works better because heat travels up. You put your case upside down therefore flipping the graphics card upright. The heat can move upward freely faster so it will cool better.
post #26 of 37
I used to say the same thing about heat, too... However, "heat" doesn't always travel "up." Within a solid, heat travels equally in all directions. In liquids and gases, the warmer substance rises above the cooler, more dense substance, whether it's air or water. This process is called "convection." Vaporized water, being less dense than liquid (having less mass per unit volume and therefore less weight) isn't pulled as strongly by gravity and therefore the water drops while the steam/vapor rises above the more dense liquid.
My System
(13 items)
 
  
CPUMotherboardGraphicsRAM
3800x2 Manchester, 2.5Ghz ASUS A8N SLI-Deluxe 7600GS --> Smoked 1GB Corsair XMS Platinum 
OSMonitorPowerCase
Windows XP Pro IBM G74 Aspire 520W Purely Custom 
Mouse
IntelliMouse Explorer 
  hide details  
Reply
My System
(13 items)
 
  
CPUMotherboardGraphicsRAM
3800x2 Manchester, 2.5Ghz ASUS A8N SLI-Deluxe 7600GS --> Smoked 1GB Corsair XMS Platinum 
OSMonitorPowerCase
Windows XP Pro IBM G74 Aspire 520W Purely Custom 
Mouse
IntelliMouse Explorer 
  hide details  
Reply
post #27 of 37
I was pretty sure nothing evaporated in a heat pipe, was i wrong?
Deep Blue
(13 items)
 
  
CPUMotherboardGraphicsRAM
AMD Phenom 2 X4 940 BE MSI DKA790GX Platinum Sapphire HD4890 OC Corsair C5D8500 2x1Gig Kit 
Hard DriveOptical DriveOSMonitor
WD Cavair Black 500 LG DVD+ RW Windows 7 Ultimate Samsung 2494hs 24 Wide 
KeyboardPowerCaseMouse
Razer Tarantula Enermax Liberty 620W DD Torture Rack Razer Lachesis 
Mouse Pad
Razer Pro Solutions 
  hide details  
Reply
Deep Blue
(13 items)
 
  
CPUMotherboardGraphicsRAM
AMD Phenom 2 X4 940 BE MSI DKA790GX Platinum Sapphire HD4890 OC Corsair C5D8500 2x1Gig Kit 
Hard DriveOptical DriveOSMonitor
WD Cavair Black 500 LG DVD+ RW Windows 7 Ultimate Samsung 2494hs 24 Wide 
KeyboardPowerCaseMouse
Razer Tarantula Enermax Liberty 620W DD Torture Rack Razer Lachesis 
Mouse Pad
Razer Pro Solutions 
  hide details  
Reply
post #28 of 37
Evaporation of the liquid in the heatpipe is essential in order for the heatpipe to function.
My System
(13 items)
 
  
CPUMotherboardGraphicsRAM
3800x2 Manchester, 2.5Ghz ASUS A8N SLI-Deluxe 7600GS --> Smoked 1GB Corsair XMS Platinum 
OSMonitorPowerCase
Windows XP Pro IBM G74 Aspire 520W Purely Custom 
Mouse
IntelliMouse Explorer 
  hide details  
Reply
My System
(13 items)
 
  
CPUMotherboardGraphicsRAM
3800x2 Manchester, 2.5Ghz ASUS A8N SLI-Deluxe 7600GS --> Smoked 1GB Corsair XMS Platinum 
OSMonitorPowerCase
Windows XP Pro IBM G74 Aspire 520W Purely Custom 
Mouse
IntelliMouse Explorer 
  hide details  
Reply
post #29 of 37
Yes, but what was your initial point? That heat travels equally in all directions?
But we knew that, and it was already mentioned how a heat pipe works in the article I posted. I thought you had a point to make, but perhaps I'm missing something.


Quote:
Inside the container is a liquid under its own pressure, that enters the pores of the capillary material, wetting all internal surfaces. Applying heat at any point along the surface of the heat pipe causes the liquid at that point to boil and enter a vapor state. When that happens, the liquid picks up the latent heat of vaporization. The gas, which then has a higher pressure, moves inside the sealed container to a colder location where it condenses. Thus, the gas gives up the latent heat of vaporization and moves heat from the input to the output end of the heat pipe.
After that repeat indefinently/\\

Simply put. The capillary is a dense metal mesh, it has a lot of little pores in it (dhurr, its a mesh). The liquid is absorbed there. When it heats up, the liquid evaporates. So the liquid closest to the heat-sink evaporates. The vapor creates pressure, and travels to the coolest point, as it does this it displaces the water in the capillary down back to the heat-sink. When it reaches the coolest point it goes back to liquid state, and into the mesh. This whole cycle repeats. Now if the capillaries aren't high quality, the pressure that the heat produces, does not help to much with the movement of water inside the capillaries. When that happens it relies on gravity to pull the liquid down trough the capillary and let the heat rise up so that it can cool.

If you don't have a high quality heat-pipe, that use a good wicker structure (capillary structure) than you are relying heavily on gravity to keep the cycle going.

Heat pipes work on pressure, but those are high quality, high built and not mass-produced. What we have are more to the end of the rope coming form heat-pipes, and when something is really good, we pay for it (one of vf900 that I bought cost more than what I payed fro my SI-120, witch has 5 big and 2 small heat-pipes, not just 2.)


-------
Off-topic, I see that you too appreciate what a monster that Amanda cooler is. With the money I spent on this crap... Arggh.
    
CPUMotherboardGraphicsRAM
E6850 GIGA GA-P35-DQ6 P35 775 Evga 8800GTX 650/2.0GHZ 2x1G|OCZ DII1066 
Hard DriveOptical DriveOSMonitor
2x320G|Seagate(Raid-0) 1x500G|Seagate 2x LITE-ON|20x Windows XP Chopped SAMSUNG 226BW Black 22" 2ms 
KeyboardPowerCaseMouse
G15 Silverstone DECATHLON 650w 54A Thermaltake Armor Series w/ 25CM Fan G7 
Mouse Pad
XTRAC Ripper 
  hide details  
Reply
    
CPUMotherboardGraphicsRAM
E6850 GIGA GA-P35-DQ6 P35 775 Evga 8800GTX 650/2.0GHZ 2x1G|OCZ DII1066 
Hard DriveOptical DriveOSMonitor
2x320G|Seagate(Raid-0) 1x500G|Seagate 2x LITE-ON|20x Windows XP Chopped SAMSUNG 226BW Black 22" 2ms 
KeyboardPowerCaseMouse
G15 Silverstone DECATHLON 650w 54A Thermaltake Armor Series w/ 25CM Fan G7 
Mouse Pad
XTRAC Ripper 
  hide details  
Reply
post #30 of 37
Quote:
Originally Posted by TeLu1
Yes, but what was your initial point? That heat travels equally in all directions?
But we knew that, and it was already mentioned how a heat pipe works in the article I posted. I thought you had a point to make, but perhaps I'm missing something.
Sorry, I was just stating a technicality.
My System
(13 items)
 
  
CPUMotherboardGraphicsRAM
3800x2 Manchester, 2.5Ghz ASUS A8N SLI-Deluxe 7600GS --> Smoked 1GB Corsair XMS Platinum 
OSMonitorPowerCase
Windows XP Pro IBM G74 Aspire 520W Purely Custom 
Mouse
IntelliMouse Explorer 
  hide details  
Reply
My System
(13 items)
 
  
CPUMotherboardGraphicsRAM
3800x2 Manchester, 2.5Ghz ASUS A8N SLI-Deluxe 7600GS --> Smoked 1GB Corsair XMS Platinum 
OSMonitorPowerCase
Windows XP Pro IBM G74 Aspire 520W Purely Custom 
Mouse
IntelliMouse Explorer 
  hide details  
Reply
New Posts  All Forums:Forum Nav:
  Return Home
  Back to Forum: Air Cooling
Overclock.net › Forums › Cooling › Air Cooling › Heatpipes......Do they REALLY work?