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And small, unpressurized airplanes do not need cooling. The air outside
is plenty cold. For heat, there's lots to be had from the exhaust or
oil with a simple heat exchanger.
In a pressurized airplane, I do not think the vortex tube would work. I
do not think you can exhaust the cold side into the cabin and the hot
side overboard, so I think you're back to conventional AC.
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