Quote:
Originally posted by redleader
Math time! 
10 comps and a "550w pump" probably works out to less then 1kw IME. Don't believe the pump power ratings, typical is generally half that, if as much. (Like my 24w Eheim 1250 that uses 9w). Lets say 1000w.
Enthalpy of evaporation is 22kj/mol for water at 101.3kpa and (IIRC) 20C. That works out to one mol lost every 22 seconds. A mole of water is 18g and a liter has a mass of 1kg, so you'd loose a liter every 1222 seconds or about every 20.5 minutes. That means 70.7 liters (about 18 gal) evaporated per day.
Plus the evaporated water gets replaced with cold water from the tap, so you get some "free" cooling right there. Lets use the above figure for simplicity of 70.7 l. Thats 70700g at say 10C below bong temp so you'd get almost 50 minutes of free cooling. Of course if you want sub ambient temps you'd loose that much trying to cool incoming water . . .
Not too bad compared to AC.
Edit: Just checked and according to my dad a cubic foot of water (~7.5gal) is 10 cents or so here in Arizona. If thats correct, then you'd be looking at just 24 cents a day assuming you can run the coolant at outside airtemp. Thats way less then a tenth of what AC would cost. I think I see why swamp coolers are so popular here.
You may want to check my math though.
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Yeah that's not good. Replacing that much water is going to be a bitch to keep the right amount anti-growth/corrosion stuff in the system. Running tap water through the system is a bad thing. You will have to hire a guy at minimum wage to stand there and dump mucho dollars of watter wetter a day if you want the system to last anyway. Water cooling basics, tap water no good! And you STILL need A/C. Back to basics, you are moving heat from one place to another place. The heat that the bong is evaporating has to go somewhere. If it is in the room it will go in the room and you will need a/c to cool the room or it will heat up.
If the bong is outside then you need to cool the air going into the bong as if it is 120F outside on a summer day you will be adding heat to the sytem instead of taking it away. Read what has been said first. I wouldn't want my computers running well over 120F.
There is no way that somesort of AC is not going to be used. And furthermore the computer room itself is STILL going to need A/C!!! CPU's are not the only thing putting out heat. With a lot of computers on one semi sealed room it will heat up fairly fast. All the componets put off heat. Even the water blocks themselfs will put of some heat. And you also have to add in all the other costs! Running those high speed fans in the bong is going to suck up a lot of power.