Re:U.S. to let airlines limit service animals on planes
by kortilla on Wednesday January 22, 2020 @07:01PM
(#22123418)
Airplanes aren’t closed-air circulation systems. Air is pulled in from the outside and heated before being injected into the cabin which releases air to the atmosphere directly through openings on the aircraft. You get more fresh are on airplane than you do in the airport you were sitting in before you boarded it.
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Re:U.S. to let airlines limit service animals on planes
by paulryanrogers on Wednesday January 22, 2020 @07:09PM
(#22123479)
IIRC it's 50% recycled to save money
Re:U.S. to let airlines limit service animals on planes
by maxcan on Wednesday January 22, 2020 @07:37PM
(#22123661)
How would that save money?
Re:U.S. to let airlines limit service animals on planes
by sowbug on Wednesday January 22, 2020 @07:54PM
(#22123772)
Probably the cost of heating -50°F air to cabin temperature.
Re:U.S. to let airlines limit service animals on planes
by sitharus on Wednesday January 22, 2020 @09:06PM
(#22124161)
Heating isn't a problem, cooling is. Most aircraft use "bleed air" from the compressor on the engine. That air is extremely hot (>150°C), so it requires a lot of cooling. Aircraft air conditioners are known as "packs" or "air-cycle machines", as they don't use any refrigerant, just compression/expansion and heat exchange with the outside air. This is also why you can smell oil and jet fuel when the engines start.
Air isn't recycled in to this system because the cabin pressure is too low, but air already inside the cabin is circulated around to avoid it stagnating.