Patent ID: 8117842

Claim:
A method for energy storage and recovery suitable for the efficient use and conservation of energy resources, the method comprising: at least one of expanding or compressing a gas via reciprocal motion within a pneumatic cylinder assembly, the reciprocal motion arising from or being converted into rotary motion, whereby energy is recovered and stored during expansion and compression of the gas, respectively; and during the at least one of expansion or compression, exchanging heat with the gas by spraying a heat-transfer liquid into the gas via a spray mechanism in order to maintain the gas at a substantially constant temperature, thereby increasing efficiency of the energy recovery and storage, wherein (i) the spray mechanism comprises at least one of a spray head or a spray rod fluidly connected to a circulation mechanism configured to circulate the heat-transfer liquid into the pneumatic cylinder assembly via the spray mechanism at high pressures ranging between 300 psi and 3000 psi, (ii) the heat exchanging is performed by a heat-exchange subsystem, and (iii) a control system controls the pneumatic cylinder assembly and the heat-exchange subsystem to enforce substantially isothermal expansion or compression of the gas.