engines compress and heat air with a fuel suitable for an . For example, burning natural gas or heats compressed air, and then a conventional engine or the rear portion of a expands it to produce work. can recharge an . The apparently-defunct Enter energy storage nitrogen bags – the industrial world's best-kept secret for smoother operations. These pressurized marvels work like hyperactive kangaroos, storing energy in their "pouches" and releasing it precisely when needed. [pdf]
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