The method of claim 1, wherein the heat-transfer fluid is introduced into the cylinder assembly at least by spraying. The method of claim 1, wherein exhausting gas from the cylinder assembly comprises transferring gas from the cylinder assembly to a second cylinder assembly, and further comprising compressing gas within the second cylinder assembly from the second pressure to a third pressure larger than the second pressure. The method of claim 1, wherein exhausting gas from the cylinder assembly comprises transferring gas from the cylinder assembly to a compressed-gas reservoir. The method of claim 1, further comprising, after recovering energy, (i) introducing additional gas at the first pressure into the cylinder assembly and (ii) compressing the additional gas from the first pressure to the second pressure. The method of claim 2, wherein the cylinder assembly comprises a piston therewithin, and the energy recovered during the regenerative stroke drives at least one of (i) a mechanism mechanically coupled to the piston or (ii) a hydraulic system coupled to the cylinder assembly. The method of claim 2, wherein (i) during the exhausting of gas from the cylinder assembly, a portion of the gas is trapped in dead volume in the cylinder assembly, and (ii) the regenerative stroke recovers energy from the gas disposed in the dead volume. The method of claim 1 wherein energy is recovered from effervescing gas using a regenerative stroke. A method for improving efficiency of a compressed-gas energy storage and recovery system, the method comprising: within a cylinder assembly, compressing gas from a first pressure to a second pressure larger than the first pressure, thereby storing energy during the compression, introducing a heat-transfer fluid into the cylinder assembly to exchange heat with the gas, thereby increasing efficiency of the energy storage, a portion of the gas dissolving into the heat-transfer fluid exhausting from the cylinder assembly gas at the second pressure, at least a portion of the heat-transfer fluid remaining in the cylinder assembly andthereafter, recovering energy from gas effervescing from the heat-transfer fluid in the cylinder assembly. A method for improving efficiency of a compressed-gas energy storage and recovery system, the method comprising: within a cylinder assembly, compressing gas from a first pressure to a second pressure larger than the first pressure, thereby storing energy during the compression, introducing a heat-transfer fluid into the cylinder assembly to exchange heat with the gas, thereby increasing efficiency of the energy storage, a portion of the gas dissolving into the heat-transfer fluid exhausting from the cylinder assembly gas at the second pressure, at lea.ฤก.
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