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The OCZ Hydrajet cooler, featured upside-down to reaveal the carbon nanotube conductor. (Source DailyTech, Anh Huynh)
The OCZ Hydrojet cooler uses an advanced heatsink material

The first heatsink to make use of directional carbon nanotubes, the OCZ Hydrojet, was on display at Computex 2007. Carbon nanotubes, an allotrope of carbon, are widely regarded as the next major thermal interface material because of their superior thermal conduction properties.  

The contact base of the OCZ Hydrojet is made completely of carbon-nanotubes, which OCZ claims are five times more efficient than copper. Carbon nanotubes have been looked upon as a strong alternative to traditional copper based heatsinks. They are ideal for application in heat transfer products because of their impressive heat-conduction properties.  Carbon nanotube based interfaces have been shown to conduct more heat than conventional thermal interface materials at the same temperatures. In addition, they have shown to be ballistic conductors at room temperature, which means electrons can flow through CNTs without collisions.

Carbon nanotubes are small wire-like structures made out of a sheet of graphene.  The sheet of graphene used to construct CNTs is roughly one-atom thick, and is rolled up into a cylinder. The diameter of the cylinder ranges in the nanometers.

Unlike most other thermal materials, carbon nanotubes are able to move heat in one direction. On the other hand, copper, which is looked upon as one of the more superior thermal materials, moves heat radially. In the case of CNTs, heat is moved along the alignment of the nanotubes.


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RE: Mm,, interesting
By MrTeal on 6/10/2007 12:31:51 PM , Rating: 3
You're both incorrect. There are two seperate systems here, and they're getting confused.

1. When the pipeline is buried unground, there is a refridgeration system in place to prevent the hot oil from melting the permafrost. This refridgeration system does not use ammonia, it uses brine cooled below the freezing point of water.

2. When the pipeline is above ground, to prevent the heat from passing through the metal supports into the ground and cause melting around them, they have a heatpipe system. Nothing is cooled below ambient, but the 50 degree celsius heats up the pipeline, but the heatpipe setup helps keep the supports near ambient temperature, providing a thermal break between the ground and pipeline. This is where the ammonia is used.


RE: Mm,, interesting
By Goty on 6/10/2007 6:08:49 PM , Rating: 2
Wouldn't brine be a little corrosive?


RE: Mm,, interesting
By MrTeal on 6/10/2007 7:39:17 PM , Rating: 2
Depends on what they use for piping. The brine doesn't go through the oil pipeline, it's very possible they use plastic lines.


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