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Thread: Raijintek demonstrates passive AiO liquid cooler

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    Raijintek demonstrates passive AiO liquid cooler

    Special coolant boils at 40°C, enters vapour chamber, and induces flowing coolant cycle.
    Read more.

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    Re: Raijintek demonstrates passive AiO liquid cooler

    Looks a great idea
    Old puter - still good enuff till I save some pennies!

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    Re: Raijintek demonstrates passive AiO liquid cooler

    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.
    Of course I'm perfect you just need to lower your expectations.

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    Re: Raijintek demonstrates passive AiO liquid cooler

    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.

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    Re: Raijintek demonstrates passive AiO liquid cooler

    "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.

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    Re: Raijintek demonstrates passive AiO liquid 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.

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    Re: Raijintek demonstrates passive AiO liquid cooler

    I wonder what will happen if there's a pressure leak and the imbalance goes out of wack, bye bye cooling!

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    Re: Raijintek demonstrates passive AiO liquid cooler

    Bottom picture looks like a mobile phone having a beer through straws. Maybe Sinclairs version of an iPhone.

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    Re: Raijintek demonstrates passive AiO liquid cooler

    This is likely 3M Novec 7000 fluid in a closed loop - here's a vid of the stuff in an immersion setup https://www.youtube.com/watch?v=Z_X_hgtlJpA

    This is something that's been on the cards for a few years - it was a case of getting the fluid cheap enough, last time I checked a couple years ago the stuff was about £150/litre. If it's getting to a decent price I might just build an immersion system.
    Last edited by zaph0d; 01-06-2016 at 05:54 PM. Reason: better vid

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    Re: Raijintek demonstrates passive AiO liquid cooler

    Quote Originally Posted by zaph0d View Post
    This is likely 3M Novec 7000 fluid in a closed loop - here's a vid of the stuff in an immersion setup https://www.youtube.com/watch?v=Z_X_hgtlJpA

    This is something that's been on the cards for a few years - it was a case of getting the fluid cheap enough, last time I checked a couple years ago the stuff was about £150/litre. If it's getting to a decent price I might just build an immersion system.
    Looks really interesting! How loud would it be with all the evaporation and "bubbling"?

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    Re: Raijintek demonstrates passive AiO liquid cooler

    In a closed loop you wouldn't hear it at all. In an immersion system it'd be as good as silent, especially when your PSU can go in as well. Only things external would be Mechanical-HDD/ODD as they can't work immersed.

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    Re: Raijintek demonstrates passive AiO liquid cooler

    What's the advantage compared to heat pipes and finned radiators?

    That radiator looks like a bog standard radiator and without forced airflow it's cooling performance is way lower to a finned radiator optimized for passive cooling.

    As far I can see the only advantage is flexible tubing instead of hard to bend / impossible to cut heat pipes.

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    Re: Raijintek demonstrates passive AiO liquid cooler

    Quote Originally Posted by zaph0d View Post
    In a closed loop you wouldn't hear it at all. In an immersion system it'd be as good as silent, especially when your PSU can go in as well. Only things external would be Mechanical-HDD/ODD as they can't work immersed.
    Surprised they went for no heatsink at all on the CPU, if the liquid is 34C and the cpu is 55C that is one hell of a temperature gradient. I would be worried that some sort of leidenfrost effect would cause poor CPU cooling. Peltier coolers are pretty nasty things too, but I guess a fridge chiller style heatpump system would be noisy enough to make the whole idea pointless.

    I saw the other day a 960GB SSD for £150, and who uses optical drives?

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    Re: Raijintek demonstrates passive AiO liquid cooler

    Quote Originally Posted by Attila the Bun View Post
    ... 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. ....
    The key is that it's not using heat exchange in the same way internally. It's using phase change, which can move a chunk more energy depending on the medium.

    In your big tower cooler heat is conducted directly into the fins through the heatpipes themselves, the structural metal surrounding them, and by the vapour action of the heatpipes - but in that set-up the liquid in the heatpipes is only acting as a faster means of transferring the heat, and it's only one part of the system. It looks like the Rajintek is using phase change alone to power the cooling cycle (a little like how a fridge works) - evaporating a liquid takes more energy than just changing its temperature, and similarly recondensing a vapour cools it more than passing it through a forced-air radiator. Phase change is a very efficient way of managing heat transfer, but AFAIK it's been difficult up to now to manage the liquid or use it in the kind of volumes that would allow it to be a sole means of cooling - previously it's been used in heat pipes and vapour chambers to speed up the transfer of heat into the cooling array. This looks like they've successfully taken the next step, and they're using the fluid as the primary coolant.

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    Re: Raijintek demonstrates passive AiO liquid cooler

    It's still got to dissipate the heat, I'd be surprised if it ships with that radiator which really doesn't look like it's up to much. Looks fun though. Let's see if I can come into some money and put together a silent VR build

    Quote Originally Posted by Brian224 View Post
    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.
    I'd hope that, regardless of which liquid they used, they make the tubing nice and tough.

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    Re: Raijintek demonstrates passive AiO liquid cooler

    It is a simple system, but wondering how much the radiator cools down the liquid, and think of a hot summer day.... would the liquid spin around like a water jet barely being able to cool at all, I mean if the product going back to the radiator is 40 degrees C or higher... how would it be when it get out from the radiator and reach the CPU block again.

    Would like to see some tests on this one

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