Would any of the big-iron drivers care to bore us with an in-depth explanation of the A/C packs on transport category aircraft, and maybe a web link with some diagrams? Maybe scan some junk out of a manual? Would be appreciated!!!
Let us also not forget the epic "Pressurization ACM" thread in the Tech/Ops forum over at airliners.net. It had a steady body count going for more than two months, with guys scanning pages from maintenance manuals and crawling in the guts of jets with a digital camera.
Education + Entertainment (+plus that site) = Edutainment (at its most awkward moments)
Packs are a pretty simple concept, really. Air is compressed, and due to compression it gets hotter than it already was. The hot air is put thru a radiator of sorts, where it is cooled by outside air that is moved thru the radiator with fans on the ground or airspeed in flight. This cools the air to a relatively lower temp. The air then goes thru a turbine which decompresses it, and in that process it cools to a lower temp than it started out with. The process is not so much different than a katabatic wind, really.