Study of System Integral Energy Efficiency of a Hybrid Pneumatic Power System

Chen, Po‐Tuan; Nghia, Duong Dinh; Yang, Cheng‐Jung; Huang, Keyong

doi:10.3390/app9112333

Cited by 9 publications

(7 citation statements)

References 19 publications

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“…The energy stored in CAST can be used to drive the wheels directly through air engines. Hybrid compressed air technology is promising, has great potential, and can be used in the future to improve the performance of the air engine and fuel efficiency [48].…”

Section: Utilization Of Stored Energy In Castsmentioning

confidence: 99%

Study of the Energy Efficiency of Compressed Air Storage Tanks

Dindorf

2024

Sustainability

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This study focusses on the energy efficiency of compressed air storage tanks (CASTs), which are used as small-scale compressed air energy storage (CAES) and renewable energy sources (RES). The objectives of this study are to develop a mathematical model of the CAST system and its original numerical solutions using experimental parameters that consider polytropic charging and discharging processes, changes in the time of the temperature, flow parameters of the inlet and outlet valves under choked and subsonic conditions, and the characteristics of the air motor. This model is used to select CAST as an energy storage system for compressed air generated by compressors and recycling, as well as an energy source to drive DC generators and a pneumatic propulsion system (PPS). A measuring test rig is built to verify the polytropic pressure and temperature variations during CAST charging and discharging obtained from numerical solutions. The topic of discussion is the functional model of a high-pressure air system (HPAS) that contains a CAST connected to an air motor coupled to a mechanical drive for a DC generator or PPS. Such a system is used in small-scale CASTs, which currently respond to socio-economic demands. The presented CAST energy efficiency indicators are used to justify the storage of compressed air energy on a small scale. Small-scale compressed air storage in CASTs is currently important and relevant due to the balance between peak electricity demand and the development of wind energy, photovoltaics, and other renewable energy sources.

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Section: Utilization Of Stored Energy In Castsmentioning

confidence: 99%

Study of the Energy Efficiency of Compressed Air Storage Tanks

Dindorf

2024

Sustainability

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“…The main goal is to develop an easily handled vehicle that would contribute to reducing environmental impacts and noise while driving as long a distance as possible [23]. Moreover, the automotive company PSA worked on the development of a car powered by compressed air that would replace the electromotors in the company's hybrid vehicles [31].…”

Section: Introductionmentioning

confidence: 99%

A Numerical Study of a Compressed Air Engine with Rotating Cylinders

Dižo¹,

Blatnický²,

Sága³

et al. 2021

Applied Sciences

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This article explores the possibility that, during the elimination of conventional combustion engines, the connecting rod becomes deflected. A larger connecting rod angle creates higher lateral pressure on the piston, also leading to greater loads on other engine components. This fact inspired us to develop an applied mechanism design that reduces the disadvantages of conventional combustion engines. The presented mathematical model that describes the designed engine working principle was created utilizing Lagrange’s equations of motion of the second kind and solved in MATLAB. This paper also includes a multibody simulation model of the engine mechanism created using the Simpack software. Based on a comparison of the two methods, the obtained waveforms of the selected kinematic quantities were found to yield minimal deviations. A real prototype was subsequently developed based on the mathematical model outputs. In this manner, we practically verified that the proposed theoretical solution for a non-conventional engine is fully functional.

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“…The engine efficiency and operation modes have been widely investigated on the new combined thermodynamic cycles of HPE. 24,25 Fazeli et al 26 studied the recycling capability of braking regenerative energy using double compressed air tanks. The experimental results indicated a 125% improvement in energy recycling compared to the single-tank system.…”

Section: Introductionmentioning

confidence: 99%

Study of high-pressure air jet controlled compression ignition with compound thermodynamic cycle for combustion and emission formation process

Meng

Liu

Cui

et al. 2020

International Journal of Engine Research

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A novel method called high-pressure air (HPA) jet controlled compression ignition (JCCI) based on the compound thermodynamic cycle was investigated in this work. The combustion process of premixed mixture can be controlled flexibly by the high-pressure air jet compression, and it characterizes the intensified low-temperature reaction and two-stage high-temperature reaction. The three-dimensional (3D) computational fluid dynamics (CFD) numerical simulation was employed to study the emission formation process and mechanism, and the effects of high-pressure air jet temperature and duration on emissions were also investigated. The simulation results showed that the NOx formation is mainly affected by the first-stage high-temperature reaction due to the higher reaction temperature. Overall, this combustion mode can obtain ultra-low NOx emission. The second-stage high-temperature reaction plays an important role in the CO and THC formation caused by the mixing effect of the high-pressure air and original in-cylinder mixture. The increasing air jet temperature leads to a larger high-temperature in-cylinder region and more fuel in the first-stage reaction, and therefore resulting in higher NOx emission. However, the increasing air jet temperature can significantly reduce the CO and THC emissions. For the air jet duration comparisons, both too short and too long air jet durations could induce higher NOx emission. A higher air jet duration would result in higher CO emission due to the more high-pressure air jet with relatively low temperature.

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Study of System Integral Energy Efficiency of a Hybrid Pneumatic Power System

Cited by 9 publications

References 19 publications

Study of the Energy Efficiency of Compressed Air Storage Tanks

Study of the Energy Efficiency of Compressed Air Storage Tanks

A Numerical Study of a Compressed Air Engine with Rotating Cylinders

Study of high-pressure air jet controlled compression ignition with compound thermodynamic cycle for combustion and emission formation process

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