yet another homemade air conditioner thread.

[madjack]

Gus, during my construction career as a plumber, we built/rebuilt several (commercial)water towers and the only thing they cooled was air...as far as cascading goes, during my trucking career I hauled liquefied CO2...it started as a gas at 0#s pressure at around 2000degrees, thru a series of cascading compressors and chillers, it was chilled to -10*F and pressurized to 300psi...somewhere along the way the gas became liquid.............
madjack

[8]

You learn something new every day...I just did.

eamarquardt said a one ton unit can freeze one ton 32 degree water into ice in a day. I didn't know that.

madjack says he thought a one ton unit was 12,000 BTUs. I didn't know that.

So, 2000 pounds of water divided by 24 hours times 144 BTUs per pound = 12,000 BTUs.

2000/24*144=12000

Hey, math works again. So, yes, MJ is correct on the 12,000 BTU number. Or we all just got real lucky with numbers we pulled out of our butt.

As for cascading systems, I intend to pick up one of these for my 3 ton home AC unit.
http://www.mistcooling.com/acprecool.html
It pre-cools the air before it goes into the AC condenser to make it more efficient.

We could do all this math again with dry ice at 246 BTUs/pound to sublimate and you would use about 45% less in weight but it will cost you a lot more and can kill you if done wrong.

[Lesbest]

Yep, Madjack is right-- the old GM compressors used in the 60's and 70's, the Harrison A6 was rated for 18,000 BTU's. That was the equiveliant to a 1 1/2 ton house unit! And in the auto business they were ONLY hoping to drop the temp. in the interior to 10 degrees below the ambient temp!
Heat sources:
people
sunlight
engine
transmission
exhaust
road heat
color of car (dark=hotter)
poorly insulated

So getting the feeling of comfort in a car is a big endevor, and a poorly insulated TD in a hot climate would be a big job to cool also.
Good luck - and make Mr. Goldberg proud- you could be the next inventor of a taxless energy source. Heatless is a good thing.

Les