Comments on: The 787, The Electric Airplane

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By: Bob

Bob — Sat, 23 Apr 2011 23:41:17 +0000

Does anyone know is there is a electrical air compressor that is APPROVED to operate at
CRUISE altitude – with min. 20 psig/2 cfm ? Thanks bob

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By: Bill P

Bill P — Thu, 28 May 2009 00:18:22 +0000

It’s not just that the bleed air on other jet aircraft is hot, but the energy it took to get the air that hot. Then, when it is used for air conditioning and pressurization, that heat get’s thrown away in both a pre-cooler and air conditioning packs.
The 787 still pulls energy off of the engine, to turn the generator, and then uses some of that energy to turn a cabin air compressor (located behind the fancy looking scoop at near the front of the wing root). But the cabin air compressors (CAC) produces less heat than typical bleed air – they even have a circuit (if needed) to put some CAC air back into the front of it to get it hot enough ( for cabin heating).