Aiming at the obstacle of the low heat transfer performance and compression/expansion efficiency of compressed air energy storage system,a multi tube array nearly isothermal compressed air energy storage method is proposed.A multi tube array compression/expansion machine that couples a liquid piston structure with a tube type heat exchange structure is designed.The liquid piston structure achieves high-pressure sealing,the tube type heat exchange structure increases the heat exchange area to improve heat exchange,and a diaphragm type structure is used to achieve gas-liquid isolation to avoid air dissolution.A water tank is used to store compressed heat and release it during air expansion.A system thermodynamic model and a heat transfer model were established to analyze the effects of multiple tube array parameters on air pressure,temperature,and compression work.The air was pressurized from 0.8 MPa to 5 MPa,and when 1000 tubes were used and the compression time was 60 seconds,the air compression efficiency could reach 70％.A new approach is provided to achieve high efficiency and high pressure compressed air energy storage.
compressed air energy storagenear isothermal air compressiontube arrayliquid piston
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