Quote Originally Posted by turtle420
if we know the heat capacity of CO2, and the one of water... and how much you'll be "purging", we can know if it'll work without building it.

....... But I think you'll have to "purge" many times to get a significant decrease in temps.
Thanks for the cookie, yum.

The heat capacity of water is one of the most amazing properties of any chemical compound.

It's really high.

The heat capacity of CO2 is MUCH MUCH lower, so yeah, you're going to have to do a lot of purging to get it that much cooler, but every little bit counts and free cooling is better than none at all.