Raijintek unveiled its first liquid cooler that works without a prime-mover for the coolant (i.e. no pump). Further, its radiator lacks fans (i.e. no power, no noise). This closed-loop cooler works in the same principle as a heat pipe, with a combination of convention and phase-change doing the heavy lifting of heat-transfer. Heat from the source (your CPU) causes the special coolant to change phase to vapor, move to the heat-exchanger (radiator), where it condenses back to liquid, and flows back down to the block. We saw this contraption in action, and we can tell you that it works. It is ready for the real-world. Raijintek spent vast amounts of R&D budget developing this technology, and has patented it in most markets. We could see the first products based on this technology very soon.

25 Comments on Raijintek Unveils its First Passive Liquid Cooler

#1 Ferrum Master

Just Awesome. Posted on Jun 1st 2016, 6:59 Reply

#2 Joss

well.... I'm impressed Posted on Jun 1st 2016, 6:59 Reply

#3 RejZoR

But wouldn't saturation of heat also slow down the circulation. The bigger the difference, the bigger is flow. But as the difference becomes smaller when heat is saturated within the coolant, it'll circulate slower and get even hotter. Posted on Jun 1st 2016, 7:01 Reply

#4 thevoiceofreason

RejZoR But wouldn't saturation of heat also slow down the circulation. The bigger the difference, the bigger is flow. But as the difference becomes smaller when heat is saturated within the coolant, it'll circulate slower and get even hotter. Possibly adding a slow fan on the radiatior would make it more efficient. I will take the sound of a fan over a pump any day. Possibly adding a slow fan on the radiatior would make it more efficient. I will take the sound of a fan over a pump any day. Posted on Jun 1st 2016, 7:05 Reply

#5 ClaytonCTA

Really impressive! Posted on Jun 1st 2016, 7:15 Reply

#6 BarbaricSoul

JUST WOW :eek:, an AIO liquid cooler that can't have pump issues. I may go back to a AIO if this is good enough to cool a OC'ed chip running full load for weeks on end. Posted on Jun 1st 2016, 7:17 Reply

#7 Steamroller

thevoiceofreason Possibly adding a slow fan on the radiatior would make it more efficient. I will take the sound of a fan over a pump any day. Yeah! Much easier to find some quality and silent fans than to listen to the crappy AIO pump sound. Yeah! Much easier to find some quality and silent fans than to listen to the crappy AIO pump sound. Posted on Jun 1st 2016, 7:34 Reply

#8 ZoneDymo



www.tomshardware.com/news/silverstone-td04-pumpless-liquid-cooling,27023.html



that was two years ago, from Silverstone, so forgive me for being sceptical about ever seeing this in stores, also "first"? yeah, right... ermm yeah:that was two years ago, from Silverstone, so forgive me for being sceptical about ever seeing this in stores, also "first"? yeah, right... Posted on Jun 1st 2016, 8:12 Reply

#9 Air

It will require an special coolant with low boiling point. Performance will be very dependent on the radiator positioning (avove or bellow cpu). Posted on Jun 1st 2016, 8:25 Reply

#10 AsRock

TPU addict Air It will require an special coolant with low boiling point. Performance will be very dependent on the radiator positioning (avove or bellow cpu). I would of thought above for best performance.



Anyways why not show a real test of this in action ?, that supposed to be hot steamy water ?, umm i need to see it actually working not this rubbish. I would of thought above for best performance.Anyways why not show a real test of this in action ?, that supposed to be hot steamy water ?, umm i need to see it actually working not this rubbish. Posted on Jun 1st 2016, 8:35 Reply

#11 SAL9000



I first saw this when searching for supercomputers and liquid cooling so they have the expertise There is another cooling system that uses a similar method from a french company named Calyos and this company made a version for a PC. www.modding.fr/presentation-le-pc-0db-de-calyos/ I first saw this when searching for supercomputers and liquid cooling so they have the expertise Posted on Jun 1st 2016, 9:09 Reply

#12 Air

AsRock I would of thought above for best performance.



Anyways why not show a real test of this in action ?, that supposed to be hot steamy water ?, umm i need to see it actually working not this rubbish. Yeah, im not sure it would even work below. Also agree about this test being pretty bad. All it shows is that the liquid moves inside the pipes... no information about temperatures, heat dissipated, etc... Yeah, im not sure it would even work below. Also agree about this test being pretty bad. All it shows is that the liquid moves inside the pipes... no information about temperatures, heat dissipated, etc... Posted on Jun 1st 2016, 9:11 Reply

#13 Caring1

Air It will require an special coolant with low boiling point. Performance will be very dependent on the radiator positioning (avove or bellow cpu). I would have thought also it requires a low boiling point to vaporise without cooking the CPU.

Also the design optimally requires the block to be horizontal or the positioning of the inlet and outlet to be upper most. I would have thought also it requires a low boiling point to vaporise without cooking the CPU.Also the design optimally requires the block to be horizontal or the positioning of the inlet and outlet to be upper most. Posted on Jun 1st 2016, 9:28 Reply

#14 Potatoking

Pretty sure this is a joke

I cant be the first one to realize Posted on Jun 1st 2016, 9:39 Reply

#15 eidairaman1

The Exiled Airman bulky version of a heatpipe cooler pretty much. Posted on Jun 1st 2016, 9:56 Reply

#16 yogurt_21

eidairaman1 bulky version of a heatpipe cooler pretty much. this...seriously. this...seriously. Posted on Jun 1st 2016, 12:35 Reply

#17 thesmokingman

Raijintek spent vast amounts of R&D Simple rad, some fittings, simple block, tubing... that equals vast amounts? Simple rad, some fittings, simple block, tubing... that equals vast amounts? Posted on Jun 1st 2016, 13:18 Reply

#18 PopcornMachine

Some here are missing the point. It's the 'special coolant' that makes this different, and probably required a lot of R&D.



And until the cooling efficiency is tested and verified, it is to early to draw a conclusion.



But if this does provide the cooling of a custom loop without a pump, sign me up. Posted on Jun 1st 2016, 16:44 Reply

#19 truth teller

PopcornMachine Some here are missing the point. It's the 'special coolant' that makes this different, and probably required a lot of R&D. create concoction that evaporates at 50ºc under a slightly increased pressure (ethyl alcohol is at around 75ºc)

spend millions of dollars on something else

...

profit? create concoction that evaporates at 50ºc under a slightly increased pressure (ethyl alcohol is at around 75ºc)spend millions of dollars on something else...profit? Posted on Jun 1st 2016, 19:00 Reply

#20 R-T-B

truth teller create concoction that evaporates at 50ºc under a slightly increased pressure (ethyl alcohol is at around 75ºc)

spend millions of dollars on something else

...

profit? You seem to be missing the "easier said than done" part of that equation. You seem to be missing the "easier said than done" part of that equation. Posted on Jun 1st 2016, 20:55 Reply

#21 Chloe Price

World's first passive? Uhm, Zalman Reserator anyone..?



Yeah, it had a pump, but still it was passive-cooled.. Posted on Jun 1st 2016, 23:35 Reply

#22 geon2k2

Simple things are usually very hard to do.



This sounds interesting, but we'll have to see some reviews first and then compare the price with the performance and the competition. If this will be in the 3 digits $$$ area from price perspective and offer more or less the same performance as a 30$, typical air cooler ... it will not be such amazing product anymore. But let's see there could still be a market for it, for the guys which would pay anything to have a silent, high performance computer. Posted on Jun 2nd 2016, 2:35 Reply

#23 W1zzard

I have no idea about pricing, but looking at it it just looks like a normal rad with a normal waterblock and a special coolant, which cant cost that much Posted on Jun 2nd 2016, 5:32 Reply

#24 DeathtoGnomes

Special coolant? R-34? R-502?

Refrigerants used in window AC units or central air work well when under pressure. However without pressure and open to the atmostphere most refrigerants evaporate very, very rapidly. In a closed loop like this it can be contained and even have a bit of pressure to it, if the loop is strong enough.



The more refrigerant heats up the more it expands, if this loops heats up to much, the weakest link in the loop will break.



So its prolly safe to say the bulk of the R&D went into just developing the refrigerant.





Note:Some people might call refrigerant Freon, but Freon was a brand name and mostly associated with old R-12 originally. Posted on Jun 2nd 2016, 7:11 Reply