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Old 05-28-2021, 12:24 AM   #21 (permalink)
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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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Old 05-28-2021, 10:08 AM   #22 (permalink)
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Originally Posted by cRiPpLe_rOoStEr View Post
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.
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.
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Old 05-28-2021, 10:24 PM   #23 (permalink)
It's all about Diesel
 
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Originally Posted by Piotrsko View Post
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.
Would be quite harder to bleed enough air from a turbocharger fitted to a conventional reciprocating engine. On a sidenote, the ACM also resorts to a turbocompressor and a heat exchanger which resembles an intercooler.
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Old 05-29-2021, 12:01 AM   #24 (permalink)
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The problem with compressed air is about half the energy is lost to heat compressing the air. That's why batteries rule.
Methods of compressing air at over 100% efficiency are possible using a temperature differential and the ocean.

But unless we are compressing CO2 exhaust from a power plant what’s the point of a gigantic underwater air column?

And if we did
why waste it in an inefficient air motor that has just as limited of a range as a Hydrogen or Early BEV vehicle?
Compressed CO2 would have more value in industry than blowing a car.

The only advantage of an air car is free air conditioning, maybe nice in Solcal but not fun up north.
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Old 05-29-2021, 12:23 AM   #25 (permalink)
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I may be wrong, but if you have a way of either efficiently absorbing and replacing the heat during compression and decompression, or a way of efficiently insulating the heat in under compression so it's there when you decompress, then that should raise efficiency.

It's when you compress the air, lose the heat after and not during compression, then decompress the air without letting it heat up in some way or form during decompression, that's when pneumatics are inefficient.

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