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Systems and methods for improving drivetrain efficiency for compressed gas energy storage and recovery systems

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TLDR
In this article, the authors proposed a staged pneumatic conversion system for providing narrow pressure ranges to a hydraulic motor. But their work was focused on power generation and energy storage and recovery.
Abstract
The invention relates to power generation and energy storage and recovery. In particular, the invention relates to compressed gas energy storage and recovery systems using staged pneumatic conversion systems for providing narrow pressure ranges to a hydraulic motor.

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References
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Wind turbines

E. Hau
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