초록 ▼

Systems, methods and devices for optimizing heat transfer within a device or system used to compress and/or expand a gas, such as air, are described herein. In some embodiments, a compressed air device and/or system can include an actuator such as a hydraulic actuator that can be used to compress a

Systems, methods and devices for optimizing heat transfer within a device or system used to compress and/or expand a gas, such as air, are described herein. In some embodiments, a compressed air device and/or system can include an actuator such as a hydraulic actuator that can be used to compress a gas within a pressure vessel. An actuator can be actuated to move a liquid into a pressure vessel such that the liquid compresses gas within the pressure vessel. In such a compressor/expander device or system, during the compression and/or expansion process, heat can be transferred to the liquid used to compress the air. The compressor/expander device or system can include a liquid purge system that can be used to remove at least a portion of the liquid to which the heat energy has been transferred such that the liquid can be cooled and then recycled within the system.

대표청구항 ▼

1. An apparatus suitable for use in a compressed gas-based energy storage and recovery system, the apparatus comprising: a pressure vessel having a working piston disposed therein for reciprocating movement in the pressure vessel, the working piston defining at least in part between a first side the

1. An apparatus suitable for use in a compressed gas-based energy storage and recovery system, the apparatus comprising: a pressure vessel having a working piston disposed therein for reciprocating movement in the pressure vessel, the working piston defining at least in part between a first side thereof and the pressure vessel a working chamber configured to contain at least one of a liquid or a gas;a first hydraulic actuator fluidically coupleable to the working chamber of the pressure vessel;a second hydraulic actuator coupled to the working piston; anda hydraulic controller operable to cause the first actuator to move a volume of liquid contained therein to the working chamber of the pressure vessel, and to cause the second actuator to move the working piston to reduce the volume of working chamber, so that:a quantity of gas contained therein can be compressed and the quantity of compressed gas can be discharged out of the working chamber, andheat energy produced by the compression of the quantity of gas can be transferred from the quantity of gas to the volume of liquid, thereby raising the temperature of a first portion of the volume of liquid from a first temperature at which it is moved into the working chamber to a second temperature greater than the first temperature and raising the temperature of a second portion of the liquid to a third temperature greater than the second temperature, andthe hydraulic controller further operable to move the working piston: a) a first distance such that the quantity of gas contained in the working chamber can be discharged from the working chamber, and b) a second distance such that the second portion of the liquid having a third temperature can be discharged from the working chamber. 2. The apparatus of claim 1, further comprising: a purge system fluidically coupleable to the pressure vessel, the purge system configured to receive the second portion of the liquid from the working chamber. 3. The apparatus of claim 1, further comprising: a purge system fluidically coupleable to the first hydraulic actuator, the purge system configured to supply a volume of liquid to the actuator having a fourth temperature, the fourth temperature being less than the third temperature. 4. The apparatus of claim 1, further comprising: a purge system fluidically coupled to a thermal management system, the purge system configured to transfer liquid removed from the pressure vessel to the thermal management system. 5. The apparatus of claim 1, further comprising: a heat transfer element disposed within the working chamber of the pressure vessel, the heat transfer element configured to receive heat energy from the gas being compressed to reduce the temperature of the compressed gas. 6. The apparatus of claim 5, wherein the heat transfer element is configured to transfer heat energy received from the compressed gas to the exterior of the working chamber. 7. The apparatus of claim 5, wherein the heat transfer element is configured to transfer heat energy received from the compressed gas to the liquid contained in the working chamber. 8. The apparatus of claim 1, further comprising: a plurality of elongate heat transfer elements disposed within the interior region of the pressure vessel, the plurality of elongate heat transfer elements configured to receive heat energy from the gas being compressed in the working chamber of the pressure vessel and to enhance thermal stratification of the volume of liquid. 9. The apparatus of claim 1, wherein the working chamber is a first working chamber, the working piston defining at least in part between a second side thereof and the pressure vessel a second working chamber configured to contain at least one of a liquid or a gas. 10. A method of compressing gas in a compressed gas-based energy storage and recovery system using a pressure vessel, the pressure vessel defining an interior region in which at least one of a liquid or a gas can be contained, the pressure vessel having a piston disposed therein for reciprocating movement in the pressure vessel and dividing the interior region of the pressure vessel into, and defining therewith, a first working chamber and a second working chamber, the method comprising: moving a volume of liquid into the first working chamber of the pressure vessel such that a portion of the volume of liquid in the first working chamber contacts a portion of a quantity of gas disposed within the first working chamber of the pressure vessel;moving the piston within the pressure vessel from a first position in which a volume of the first working chamber is greater than a volume of the second working chamber to a second position in which the volume of the first working chamber is less than the volume of the second working chamber, the piston and the volume of liquid collectively configured to compress the quantity of gas within the first working chamber when the piston is moved from its first position to its second position;substantially simultaneously with the moving the piston, moving the compressed gas from the first working chamber;removing from the first working chamber of the pressure vessel a portion of the volume of liquid, the removed portion of the volume of liquid being a first portion of the volume of liquid in the first working chamber and having a first temperature, the volume of liquid within the first working chamber having a second portion having a second temperature, the first temperature being greater than the second temperature;moving a volume of liquid into the second working chamber of the pressure vessel such that a portion of the volume of liquid in the second working chamber contacts a portion of a quantity of gas disposed within the second working chamber of the pressure vessel;moving the piston within the pressure vessel from its second position to its first position such that the quantity of gas within the second working chamber is compressed by the piston;substantially simultaneously with the moving the piston from its second position to its first position, moving the compressed gas from the second working chamber; andremoving from the second working chamber a portion of the volume of liquid, the removed portion of the volume of liquid being a first portion of the volume of liquid in the second working chamber and having a third temperature, the volume of liquid within the second working chamber having a second portion having a fourth temperature, the third temperature being greater than the fourth temperature. 11. The method of claim 10, further comprising: removing from the first working chamber of the pressure vessel the second portion of the volume of liquid. 12. The method of claim 10, wherein the volume of liquid is received from a hydraulic actuator coupled to the pressure vessel, the method further comprising: transferring the second portion of the volume of liquid from the first working chamber of the pressure vessel to the hydraulic actuator. 13. The method of claim 10, further comprising: transferring the first portion of the volume of liquid to a thermal management system.