Modeling and Trajectory Optimization of Water Spray Cooling in a Liquid Piston Air Compressor

Saadat, Mohsen; Shirazi, Farzad A.; Li, Perry Y.

doi:10.1115/ht2013-17611

Cited by 7 publications

(4 citation statements)

References 16 publications

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“…4-top) and the value calculated by the suggested correlation defined by Eqs. (2), (3) and (4). Therefore, the optimization problem is formulated as:…”

Section: Heat Transfer Modelingmentioning

confidence: 99%

“…This efficiency-power density trade-off is mediated by heat transfer so that increasing heat transfer capability per unit volume will improve the trade-off. One approach is to inject tiny water droplets during the compression/expansion process [3,4] since the droplets present large surface area and heat capacity for heat transfer. This is especially useful for the low pressure stage compressor/expander.…”

Section: Introductionmentioning

confidence: 99%

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Air Compression Performance Improvement via Trajectory Optimization: Experimental Validation

Saadat

Srivatsa

et al. 2016

Volume 1: Advances in Control Design Methods, Nonlinear and Optimal Control, Robotics, and Wind Energy Systems; Aerospace Appli

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In an isothermal compressed air energy storage (CAES) system, it is critical that the high pressure air compressor/expander is both efficient and power dense. The fundamental trade-off between efficiency and power density is due to limitation in heat transfer capacity during the compression/expansion process. In our previous works, optimization of the compression/expansion trajectory has been proposed as a means to mitigate this trade-off. Analysis and simulations have shown that the use of optimized trajectory can increase power density significantly (2–3 fold) over ad-hoc linear or sinusoidal trajectories without sacrificing efficiency especially for high pressure ratios. This paper presents the first experimental validation of this approach in high pressure (7bar to 200bar) compression. Experiments are performed on an instrumented liquid piston compressor. Correlations for the heat transfer coefficient were obtained empirically from a set of CFD simulations under different conditions. Dynamic programming approach is used to calculate the optimal compression trajectories by minimizing the compression time for a range of desired compression efficiencies. These compression profiles (as function of compression time) are then tracked in a liquid piston air compressor testbed using a combination of feed-forward and feedback control strategy. Compared to ad-hoc constant flow rate trajectories, the optimal trajectories double the power density at 80% efficiency or improve the thermal efficiency by 5% over a range of power densities.

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“…4-top) and the value calculated by the suggested correlation defined by Eqs. (2), (3) and (4). Therefore, the optimization problem is formulated as:…”

Section: Heat Transfer Modelingmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Air Compression Performance Improvement via Trajectory Optimization: Experimental Validation

Saadat

Srivatsa

et al. 2016

Volume 1: Advances in Control Design Methods, Nonlinear and Optimal Control, Robotics, and Wind Energy Systems; Aerospace Appli

Self Cite

View full text Add to dashboard Cite

show abstract

“…Heat transfer capability can be enhanced by actively spraying very small liquid droplets with high heat capacity and large total heat transfer surface area [15][16][17][18]. The approach pursued in this paper is the use of a liquid piston in a compression/expansion chamber filled with porous material, as proposed in [19].…”

Section: Introductionmentioning

confidence: 99%

Experimental study of heat transfer enhancement in a liquid piston compressor/expander using porous media inserts

et al. 2015

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“…Heat transfer rate can be raised in the LPGC by continuously spraying very small liquid droplets with high heat capacity and large total heat transfer surface area [18,19]. Patil et al [19] investigated the effectiveness of spray injection to achieve near-isothermal compression experimentally in a liquid piston compressor for a compression ratio of about 2.5.…”

Section: Introductionmentioning

confidence: 99%

Experimental and modelling analysis of efficiency enhancement in a liquid piston gas compressor using metal plate inserts for compressed air energy storage application

Khaljani

Vennard

Harrison

et al. 2021

Journal of Energy Storage

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Modeling and Trajectory Optimization of Water Spray Cooling in a Liquid Piston Air Compressor

Abstract: An efficient and sufficiently power dense air compressor/expander is the key element in a Compressed

Cited by 7 publications

References 16 publications

Air Compression Performance Improvement via Trajectory Optimization: Experimental Validation

Air Compression Performance Improvement via Trajectory Optimization: Experimental Validation

Experimental study of heat transfer enhancement in a liquid piston compressor/expander using porous media inserts

Experimental and modelling analysis of efficiency enhancement in a liquid piston gas compressor using metal plate inserts for compressed air energy storage application

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