Optimal trajectories for a liquid piston compressor/expander in a Compressed Air Energy Storage system with consideration of heat transfer and friction

2012 ◽  
Author(s):  
M. Saadat ◽  
P. Y. Li ◽  
T. W. Simon
Keyword(s):  
Heat Transfer ◽  
Energy Storage ◽  
Storage System ◽  
Piston Compressor ◽  
Energy Storage System ◽  
Compressed Air ◽  
Optimal Trajectories ◽  
Compressed Air Energy Storage ◽  
Liquid Piston

Analysis, Fabrication, and Testing of a Liquid Piston Compressor Prototype for an Ocean Compressed Air Energy Storage (OCAES) System

2014 ◽  
Vol 48 (6) ◽  
pp. 86-97 ◽  
Author(s):  
Joong-kyoo Park ◽  
Paul I. Ro ◽  
Xiao He ◽  
Andre P. Mazzoleni
Keyword(s):  
Heat Transfer ◽  
Energy Storage ◽  
Piston Compressor ◽  
Compressed Air ◽  
Compressed Air Energy Storage ◽  
Compression Process ◽  
Compression System ◽  
Numerical Studies ◽  
Piston System ◽  
Liquid Piston

AbstractPrevious work concerning ocean compressed air energy storage (OCAES) systems has revealed the need for an efficient means for compressing air that minimizes the energy lost to heat during the compression process. In this paper, we present analysis, simulation, and testing of a tabletop proof-of-concept experiment of a liquid piston compression system coupled with a simulated OCAES system, with special attention given to heat transfer issues. An experimental model of a liquid piston system was built and tested with two different materials, polycarbonate and aluminum alloy, used for the compression chamber. This tabletop liquid piston system was tested in conjunction with a simulated OCAES system, which consisted of a hydrostatic tank connected to a compressed-air source from the wall to mimic the constant hydrostatic pressure at ocean depth experienced by the air stored in an actual OCAES system. Good agreement was found between the experimental and numerical studies and demonstrated that the heat transfer characteristics of a liquid piston compression process are effective in reducing the increase in air temperature that occurs during the compression process. The results also suggest that it may be possible to achieve a near-isothermal process with a fully optimized liquid piston compression system.

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