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TechPowerUp wrote:

Raijintek invented the world's 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.

DrCR wrote:

Is this essentially a flexible heatpipe?

The LCS is filled with a customized coolant, which has evaporation point of around 40°C to 50°C. Once the CPU or the GPU gets hot enough, the coolant turns into vapor and streams to the radiator through one of the tubes where it condenses back to liquid, whereas the cool coolant streams back to the water block. The theoretical limit of TDP that Raijintek’s prototype can handle is unclear, but different reports point to over 200 W, which is in line with traditional high-end and AIO liquid coolers.

pikaporeon wrote:

I know it's a different concept but all I could think of was this old behemoth
http://techreport.com/review/6860/zalma ... ter-cooler

biffzinker wrote:

pikaporeon wrote:

I know it's a different concept but all I could think of was this old behemoth
http://techreport.com/review/6860/zalma ... ter-cooler

Passive though meaning no pump or fan. I'm still not sure Raijintek's passive water cooler can handle up to the rumored 200 watts of heat. Maybe it is possible?

Redocbew wrote:

I've never really understood the whole "completely passive" thing anyway. For an industrial machine that has to live in a harsh environment I get it, but for the average PC it's a solution looking for a problem.

biffzinker wrote:

pikaporeon wrote:

I know it's a different concept but all I could think of was this old behemoth
http://techreport.com/review/6860/zalma ... ter-cooler

Passive though meaning no pump or fan. I'm still not sure Raijintek's passive water cooler can handle up to the rumored 200 watts of heat. Maybe it is possible?

Kougar wrote:

Hoses & barbs aren't even the same size... relying on pure evaporation without any means of directing the gas into the correct plastic pipe? I would imagine the CPU would run very hot with such a setup, heatpipes at least provide direction for the gas to follow to the fins

blahsaysblah wrote:

biffzinker wrote:

pikaporeon wrote:

I know it's a different concept but all I could think of was this old behemoth
http://techreport.com/review/6860/zalma ... ter-cooler

Passive though meaning no pump or fan. I'm still not sure Raijintek's passive water cooler can handle up to the rumored 200 watts of heat. Maybe it is possible?

If the top of the case is fully vented and this is placed up there, there could be enough normal air convection, as long as the case also has good fresh air source to let it work.

Most of the "fanless" stuff has fine print of optimal placement and air flow via case fans.

It's easy to move a decent amount of air w/o producing enough noise pressure to notice without being a few inches away.

JustAnEngineer wrote:

A chimney works because hot air is less dense than cold air. A tall, well-insulated chimney can provide quite a bit of natural draft. A six-foot length of plastic pipe attached to the top vent of your case would improve its passive cooling capability significantly.

Redocbew wrote:

JustAnEngineer wrote:

A chimney works because hot air is less dense than cold air. A tall, well-insulated chimney can provide quite a bit of natural draft. A six-foot length of plastic pipe attached to the top vent of your case would improve its passive cooling capability significantly.

A PC has a much lower temperature delta than a chimney which seems like it would reduce the potential for an upward draft?

JustAnEngineer wrote:

Redocbew wrote:

JustAnEngineer wrote:

A chimney works because hot air is less dense than cold air. A tall, well-insulated chimney can provide quite a bit of natural draft. A six-foot length of plastic pipe attached to the top vent of your case would improve its passive cooling capability significantly.

A PC has a much lower temperature delta than a chimney which seems like it would reduce the potential for an upward draft?

Air at 25 °C with a dewpoint of 7½ °C at one atmosphere of pressure has a density of 1.1793 kg/m³.
Air at 40 °C at the same conditions has a density of 1.1228 kg/m³.
Air at 60 °C at the same conditions has a density of 1.0554 kg/m³.
For a two meter tall chimney, the difference between 60 °C air and 25 °C air adds up to 2x(1.1793-1.0554) = 0.2478 kg/m² difference in pressure. A sheet of writing paper is about 3½ times as heavy as that. Your PC's case is only about half a meter tall and the heat generating components may be near the middle or top instead of being located at the bottom.

D@ Br@b($)! wrote:

JustAnEngineer wrote:

Redocbew wrote:

<PC not hot enough to be gud chimney, yes?>

<NUMBARS>
<PC's aren't 2m tall>
<The hot bit isn't even in the right place>

???HuH???

So?

D@ Br@b($)! wrote:

After that i took the side panel of an it overheated

Chrispy_ wrote:

So:

Your half-meter tall PC case is going to be a particularly useless chimney.
Not only that, but it's not even a half-meter tall chimney because the only part of it acting as a chimney is the 25cm between the GPU and the top.