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Raijintek demonstrates passive AiO liquid cooler

by Mark Tyson on 1 June 2016, 13:21

Quick Link: HEXUS.net/qac3g4

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For those who choose an all-in-one liquid cooling solution hoping for greater cooling efficiency and noise reduction but are peeved by the different noise profile emanating from the cooler pump and/or actively cooled radiator there may be a solution on the way. PC components and accessories maker Raijintek has been demonstrating a passive liquid cooler at Computex 2016 in Taipei.

As explained by TechPowerUp, which witnessed the cooler in action, this closed loop AiO cooler has no moving parts. Rather the heatsink warming up induces the specially formulated cooling fluid within to flow around the close loop. Thus the system doesn't require a pump (potential for noise and failure) and eschews cooling fans in the radiator portion, cutting out another potential noise/moving parts failure source.

The liquid flows thanks to the same science behind how heat-pipes work. TPU elaborates; "Heat from the source (your CPU) causes the special coolant to change phase to vapour, move to the heat-exchanger (radiator), where it condenses back to liquid, and flows back down to the block." Another report on the cooler by BitTech informs us that the "special coolant boils at under 40°C, and different sized pipes to create a pressure imbalance and force the liquid to evaporate in one direction only and thus generate flow."

Note the in/out flow pipe size differential

Apparently Raijintek has spent "vast amounts of R&D budget developing this technology," and with its patents in hand is ready to launch the system as demonstrated. Likely for dramatic effect, Raijintek demonstrated the cooler working to cool boiled water straight from a kettle but we would have preferred to see it in a high-end PC system running some modern gaming/tech demos, for example. Please note that to get the cooler to function it is a necessity to install the radiator portion of the device at a point somewhere above the CPU being cooled.

It will be interesting to hear and see more of this passive AiO liquid cooler from Raijitek, perhaps as launch gets nearer. Key cooling performance figures are necessary to judge if it can make more powerful fanless passive PC systems a reality.



HEXUS Forums :: 15 Comments

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Looks a great idea ;)
Could someone correct me if I misunderstood this:
There is no pump in the heat sink and no fans on the radiator…so then the only real difference from a tower passive cooler will be the fluid, which presumably is much more efficient than the stuff currently used in said tower cooler as I would have thought a rad with no air being forced through is less efficient at removing hot air than the larger vanes on a passive tower.
Thermodynamics wasn't my strongest subject so I could be talking utter pants here.
I love the idea, but would rather wait until I knew both the working fluid and its operating pressure. Too many of the possible candidates are one or more of toxic, flammable, carcinogenic or narcotic for my liking.
“Key cooling performance figures are necessary to judge if it can make more powerful fanless passive PC systems a reality.”

I'm not sure that's what they're aiming for.

I find this exciting because it'll allow better packaging and more secure mounting compared to conventional heavy-lump-of-metal passive coolers. This could easily be fitted to a design like the Dan A4-SFX without significantly increasing it's size which you could never do with a traditional passive cooler.
The pre-warning on the price tag is hidden in the article.

Apparently Raijintek has spent “vast amounts of R&D budget developing this technology,”
Be prepared to pay LOL.

Wonder how quickly the evaporation is triggered by the heat transfer as that will be key to efficiency.