Modelling and Performance Analysis of Cyclic Hydro-Pneumatic Energy Storage System Considering the Thermodynamic Characteristics

Lulu Gao (), Dongyue Wang, Chun Jin and Tong Yi
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Lulu Gao: School of Mechanical Engineering, University of Science and Technology Beijing, Beijing 100083, China
Dongyue Wang: School of Mechanical Engineering, University of Science and Technology Beijing, Beijing 100083, China
Chun Jin: School of Mechanical Engineering, University of Science and Technology Beijing, Beijing 100083, China
Tong Yi: Jiangsu Advanced Construction Machinery Innovation Center Ltd., Xuzhou 221004, China

Energies, 2022, vol. 15, issue 18, 1-19

Abstract: The energy storage system of electric-drive heavy mining trucks takes on a critical significance in the characteristics including excellent load capacity, economy, and high efficiency. However, the existing battery-based system does not apply to harsh cold environments, which is the common working condition for the above trucks. A type of cycle hydro-pneumatic energy storage system for the trucks was proposed in this study. The dynamic model of the system, including the dynamic and thermodynamic models of hydraulic and pneumatic parts, was built to analyze the performance of the system. Subsequently, the thermodynamic characteristics were clarified during the energy storage and released through the real test condition-based simulation. The power and energy performances of the system were studied in practice based on the above characteristics. The analysis of the results showed that the system reduced 22.03% driving power at the optimal braking energy recovery rate, the energy density was nearly 12.6 MJ/m 3 , the maximum input power was higher than 230 kW, and the cycle efficiency was about 40.6%. The results of this study will be conducive to the application of the hydro-pneumatic energy storage system for the electric-drive mining trucks and reducing the resulting carbon emission.

Keywords: heavy mining dump trucks (HMDT); hydro-pneumatic; energy storage system (ESS); thermodynamics (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2022
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (1)

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