Originally Posted by
BizFlyin
Yawn. 1980 Australian military document? Really? If you want to play google-the-source, we can do that. I can see you skipped over quite a few documents which say exactly what I'm saying if you say, google for "airplane air conditioning." Maybe while you're at it, google "heat exchanger."
Nothing what you wrote above negates the fact that aircraft have a/c cooling packs and that air used in cabins is cooled despite the fact that temps outside the a/c at cruising speed are well below freezing. Hence your attempt at critical thinking in post 11 was dis-proven not only by logical reasoning, but also the 1980's article as well as the below more recent 2012 article which discusses cooling systems on aircraft, which, incidentally, is on the second page of a google search for "airplane air conditioning"
When the cold, sub-freezing air gets sucked into the engine at cruising speed, it is then compressed. This compressed air is hot and is transported via ducks to the a/c packs where it is then cooled to make for room/cabin temperature.
http://www.decodedscience.com/air-co...aircraft/10938
So, yes, it does appear we have different definitions of critical thinking. You seem to believe that cabin air does not need to be cooled because outside temps are well below freezing, but aviation mechanics and aircraft systems clearly differ with your "critical thinking".