Alternative to brazing?

[sjg0]

True but the useful life of a phase change system for a computer is really only ~2 years. CPU generations are fast and to keep up you have to rebuild anyway.

Just build your phaser with a ridiculously large condenser and retune everytime the latest CPU comes out, no?
Besides, Processors only jump about 25W load every generation. To me that doesnt justify a whole rebuild.
Also, the trend nowadays seems to be the whole "green" thing so i predict CPU loads will actually come down.

[teyber]

p4-> to the core 2(quad) necessitated a rebuild, core 2 -> i7 lookin like rebuild is necessary. It doesn't have to do with the condenser size but how restrictive the metering device is.

[SexyMF]

Each CPU does have a smaller die size and a lower TDP but we keep putting more into a package so the overall thermal load is high. Adding to that is the heat generated by overclocking is also scaled with the number of cores.

It will become more apparent soon that the heatload testers people are building can't reflect the heat density of the CPU die. I think we are going to need to move away from capillary tube into adjustable metering devices and just tune them directly on the CPU.

[Moc]

It will become more apparent soon that the heatload testers people are building can't reflect the heat density of the CPU die.

That is not important for a loadtester. As long as the temperature of the loadtester is under the room temp. the complete heat is getting to the evap. This is the only part of the loadtester.
For my comprehension, its just important for the evaporator.

I think we are going to need to move away from capillary tube into adjustable metering devices and just tune them directly on the CPU.

This is a point where I fully agree with you.

But the problem is, that only CPEVs are adjustable and there we slide in a new problem:
If we tune the CPEV to the max. load of the cpu, what will it do when there is no load? It keeps the pressure constant . And than the massflow is to high (as high as it is with load) and we get a really heavy floodback.

A captubes adjusts itself over the highside pressure (no load -> lower pressure on the highside -> less refrigerant gets through the captube).

One possibility would be a needle valve (a member from our forum tried some, but some started leaking, others were killed during brazing) but here someone have to find a useable one....

[tiborrr]

The future is in the pulse width moderation refrigeration. A simple IC that adjusts the rate/sampling of refrigerant flow via temperature & pressure monitoring.

[sjg0]

what will it do when there is no load?

Folding@Home ftw

The future is in the pulse width moderation refrigeration. A simple IC that adjusts the rate/sampling of refrigerant flow via temperature & pressure monitoring.

I think this is what gomeler was trying to do with that VFD. But not exactly.

[sjg0]

p4-> to the core 2(quad) necessitated a rebuild, core 2 -> i7 lookin like rebuild is necessary. It doesn't have to do with the condenser size but how restrictive the metering device is.

Oops forgot about the cap tube. :S

[SexyMF]

@Moc:

Being able to shift heat from copper->thermal compound->copper with a surface area the size of the whole CPU doesn't equate to trying to shift the same amount of heat from a much smaller die->heat spread->thermal compound->copper.

This is why we have heat-pipe technology heatsinks.

[ultralo1]

True but the useful life of a phase change system for a computer is really only ~2 years. CPU generations are fast and to keep up you have to rebuild anyway.

Its your money.