Cool new tidbit.

[jinu117]

Never thought about this but while studying cryogenic book (yeah... lot of fun equations -_-) I came across material property that was interesting and might explain few behaviours that was bit contradictory to what we've been seeing :)
Copper's thermal conductivity increases as temperature goes down (well metals do). But thermal conductivity at 300k is 3.98 (room temp or so), 4.13 at 200k (bit lower than single stage), around 100k it is 4.83 (yup big jump there)
I am guessing at typical cascade temperature the conductivity must be quite good compared to single stage where heat transmittal is much better which might explain some interesting behaviour of evaps tending to be able to handle better load than what it was originally designed for (as well as the fact the gas/liquid specific heat changes as temp gets lower).
Something to think about definitely when designing evap for cascade :)

[Fhqwhgads6680]

So less surface area is required to hold the same load at cascade temps? So Would an evap with a thicker base and less surface area hold load better on a cascade due to less fluctuation from load to no load?

[AliG]

so this is why cascades can push cpus to much higher speeds even though the cpu is already chilled to way below ambient temps with a ss (well, the evap is anyways, so the jump in thermal conductivity for the cascade's temps must help a lot)

nice find

[TopherTony]

And copper thermal conductivity surpasses silver at a very low temp, correct?

[AliG]

It may, I'm no expert, but I'd be willing to bet since most metals' thermal conductivity increases with lower temps, silver would still be better, just making a silver evap would be hard due to silver's melting temp

[TopherTony]

what i'm saying is that as the two metal decrease in temperature at the same rate, the thermal properties of Cu increase faster than that of Ag, eventually surpassing Ag at a certain (very low) temp.

[Unknown_road]

that cross point is around -130*C

[[XC] gomeler]

Hmm optimal for.. Intel cold-bug. Guess that blows that concept out of the water for actual applications.