welcome to lonus Tech tips today's video is all about building and using a 6 foot
tall evaporative cooler to cool down a core i7 extreme Edition processor this
is colloquially known as bong cooling so
sit back relax get real relaxed and
enjoy
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for free at the link in the video description so some of you are probably
asking yourselves is he serious right now and the answer is yes let's begin
then with some Theory traditional PC coolers like heat sinks and closed loop
water cooling systems and even fully custom water coolers can deliver
fantastic results for overclock ERS and silence enthusiasts but sadly videos
like this showing -10 to -2° CPU
temperatures with a bunch of fans on a radiator will always be shockingly
effectively however epic trolls through
the miracle of video editing TTL who legitimately has plenty of gear capable
of reaching those temps swapped in some screen cap of a different cooling system
and we know this because three cheer for Science and the laws of thermodynamics
heat just like water or nutrients across
the membrane of a cell naturally flows from an area of higher temperature one
with a higher average kinetic energy of its molecules and atoms to one of lower
temperature so as air let's say it's 22°
C passes over a heat sink that's sitting
at around 50° C due to its absorption of
thermal energy from a CPU underneath that thermal energy naturally transfers
from the hot heat sink to the cooler surrounding air where it can be blown
out of window or whatever and The Wider the difference in temperature between
the heat sink and the air the faster this transfer takes place which is why
you'll reach a maximum load temperature while running a game for 15 to 30
minutes instead of it just continuing to rise cool right sure it is but all
cooling systems that rely on the these principles inherently share a hard
performance limit that is to say that no matter how many heat pipes radiators or
cooling fans you add you can never get
below the temperature of the air around you well hold on a second lonus what
about wind chill when I put my ARM out the window of my car it feels a whole
hell of a lot cooler cruising down the highway than sitting at a red light even
when it's really hot outside well that is because you are made of water water
the effect that you're feeling is called evaporative cooling and it works thanks
to a neat little concept called stick with me here we're almost done the
enthalpy of vaporization in simple terms
for a given mass of fluid to change phases for example from liquid to gas
energy must be either absorbed or
released ice can be colder than Z
degrees fun fact and water vapor can be hot enough to burn you or hot enough to
freaking cook you but not while it is in
the midst of a phase change that's why
the mixture of ice and water in your glass stays at exactly 0° C until all of
the ice is melted and that's why your Boiling Pot of water on the stove stays
at exactly 100° until all the water
evaporates and then you need to buy a new piece of cookware the heat energy
being added by the Sun or the cooking element is being used to break hydrogen
bonds between H2O molecules before the
new phase can continue to heat up so as long as you keep adding ice or water to
that two-phase mixture the temperature remains constant okay then so bong
cooling you don't have to put water on a
stove for it to evaporate otherwise I mean how would the glass of water you
spill on the carpet Ever Dry more heat
just speeds up this process and if you've ever tried to clean up a spill
before Mom notices it you probably also know that more air flow maybe in the
form of a fan makes this happen faster too so in a nutshell a bong cooler works
by first creating small droplets of water with a shower head this gives the
falling water more surface area making it easier to evaporate then dropping
these water droplets down a cooling tower which causes the water molecules
on the surface of the droplets to change phase to gas absorbing heat energy from
the liquid water that remains in the falling droplet effectively cooling it
we use fans then to blow air from the bottom of the cooling tower to the top
to accelerate this process this allows
us to potentially reach subambient
temperatures assuming enough air flow big enough towers and favorable humidity
and atmospheric pressure conditions this is at the cost however of losing to the
room around us some of that liquid water
so let's build it then shall we darus will be assisting me since I'll be in
another country by the time this is being filmed here's what you'll need we
took a lot of cues from this awesome build log over on overclock.net
4in diameter PVC piping PVC joiners two
120 mm fans with a power adapter for them as many shower heads as you will
have cooling tower some wood a PVC y one
per
Tower a powerful pump to get water to
the top of the shower heads 1/ in clear flexible tubing some miscellaneous 5/8
in PVC fittings to join our tubing runs together and a normal CPU water block
which leads us then to Moment of Truth time and here here are the results the
advantage of bong cooling here is that we were able to beat the performance of
a traditional ambient CPU Cooler without
adding a significant electrical cost thermoelectric or pelti cooling air
conditioning or phase change would incur these penalties and the higher your
airflow our fans are actually kind of wimpy and the lower the humidity in your
environment desert dwellers Rejoice the more effective this would be but there
are some disadvantages as well it's kind of loud if you're not into the whole
falling water relaxation thing it increases the humidity of the room it
occupies it's large if you want it to work well and finally unless you were to
rig up some kind of water level meter and an automated topup mechanism
connected to your house Plumbing which is possible mind you you'll need to
constantly top it up with water which is why most people don't don't build them
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today as the kids
say they don't say that do they so
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