I've been thinking about blowing cold air into a puter case.
Towards what end?
It won't be quieter than a properly set up system, and
practically all parts crucial to overclocking have had
water-blocked designed for them.
Remember that computer components may sometimes be cheaply
implemented to barely stay cool enough but even so, they are
meant to be able to run in room-temp environment.
Water
cooling only takes care of the CPU / GPU, while the other devices: HD /
CD / DVD, other MB chips, etc are left to fans.
Do you realize that this is because fans are entirely
sufficient to cool them? That is, unless there are serious
design mistakes made, for example a really poor case.
I know nothing about
cooling compressors, but what's the possibily of building a small
refrigeration unit and blowing the cold air inside the case?
Of course it's possible, and would cost an arm and a leg if
you wanted a custom job where you first buy individual
parts, weld it all, have a technician charge the
refridgerant. Cheaper would be to modify a very small
refridgerator or window AC unit. Simplest and quietest (by
being rid of the compressor) would be peltiers, but they
gobble up energy, multiple times as much to move the same
amount of heat out of the system.
I did a cursory search on google and didn't find much.
When considering doing something that is unnecessary, this
is often the case. You need to first define exactly what
your goal is, THEN what your cooling system will need be to
accomplish it, instead of the somewhat backwards goal of
taking a cooling system type and then trying to apply to a
scenario.
If you just want an easy answer, take the smallest
refridgerator you can find, then modify the back for the I/O
ports and the front for drive bay openings, LEDs and
switch(es), USB and audio ports, etc... keeping in mind that
if you keey the temp too low, condensation will be a
problem.