Quote:
Originally Posted by cRiPpLe_rOoStEr
Even though the air-cycling system applied to airliners may be possible to scale down enough to fit into a pneumatic hybrid, I'd take its suitability with a grain of salt. Vapour-cycle air conditioning is likely to remain more common for such purposes. Unless a heat pump could be applied to a pneumatic hybrid in order to improve its overall efficiency.
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I was good on this until I remembered how they get their air.
It is compressor stage heated air that is bypassed from the front of the engine ran down a flex duct in the wing into the cabin then back out to atmosphere through a pressure valve. May or may not be filtered where the circulating air system is filtered with a hepa style filter to get the smell particles reduced. Exchange rate used to be like 3 times per hour but now it's 6.