Abstract
A novel water cycle compressed air energy storage system (WC-CAES) is proposed to improve the energy storage density (ESD) and round trip efficiency (RTE) of A-CAES. The new system decreases electricity consumption by recovering and reusing the hydraulic pressure of water. The thermodynamic characteristics of WC-CAES are evaluated by energy and advanced exergy analysis method. When the air storage pressure of WC-CAES is equal to the minimum storage pressure of A-CAES (4.2 MPa), the ESD and generalized storage density increase by 5.85 % and 32.41 %, respectively. When the air storage pressure increases to the same level as A-CAES (7.2 MPa), ESD and generalized storage density increase by 112 % and 162 %, respectively. In addition, the RTE increases by 1.6 % when the air storage pressure is 4.2 MPa. WC-CAES is therefore verified to be an effective way to improve the performance of conventional A-CAES.
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Abbreviations
- T :
-
Temperature, K
- P :
-
Pressure, kpa
- ṁ :
-
Mass flow rate, kg/m3
- h :
-
Specific enthalpy, KJ/kg
- Ẇ :
-
Power, KW
- π :
-
Pressure ratio
- η :
-
Efficiency
- ρ :
-
Density, kg/m3
- V :
-
Volume, m3
- t :
-
Time, s
- Ė :
-
Exergy, KJ/kg
- ex :
-
Specific exergy, KJ/kg
- D :
-
Generalized storage density, MJ/m3
- i :
-
State point
- cj :
-
Compressor
- ej :
-
Turbine
- in :
-
Inlet
- out :
-
Outlet
- oil :
-
Heat transfer oil
- d :
-
Destruction
- w :
-
Water
- hydro :
-
Hydro turbine
- charge :
-
Charge process
- discharge :
-
Discharge process
- is :
-
Isentropic
- AS :
-
Air/water (air) storage
- LC1, LC2 :
-
Low pressure compressor
- HC :
-
High pressure compressor
- HT1, HT2 :
-
High pressure turbine
- LT1-LT4 :
-
Low pressure turbine
- AS :
-
Air/water (air) storage tank
- HE :
-
Heat exchanger
- TV :
-
Throttle value
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Acknowledgments
The authors would like to acknowledge the financial support by the Key Research and Development Program of Shandong province (No. 2017GGX40104) and the Fundamental Research Funds of Shandong University (No. 2017JC039) that facilitated this research.
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Zhen Xu received the B.S. in Chemical Equipment and Machinery from the Qingdao Institute of Chemical Technology in 1999, and the Ph.D. in Power Engineering and Engineering Thermophysics from Chinese Academy of Sciences in 2006. He is currently an Associate Professor with the Shandong University. His research interests include high efficiency waste heat utilization and energy saving.
Haiyang Yang received his Master’s in Power Engineering from Shandong University in 2020 and is currently a Ph.D. student at Institute of Engineering Thermophysics, Chinese Academy of Sciences. His research direction includes the optimization of the cogeneration system coupled with compressed air energy storage and the development of high-efficiency, low-carbon and low-nitrogen combustion chambers.
Yingchun Xie received the B.S. in Chemical Equipment and Machinery from the Qingdao Institute of Chemical Technology in 1999, and the Ph.D. in Port, Coastal and Offshore Engineering from Ocean University of China in 2018. She is currently a Professor with the Ocean University of China. Her research interests include integration and optimization of the thermal system, and working environment adaptability research of offshore oil platform.
Jinchi Zhu received the B.S. in Mechanical Design, Manufacturing and Automation from the Ocean University of China in 2017, and the M.S. in Power Engineering with the Ocean University of China in 2020. His current research interests include fluid mechanics and computational fluid dynamics.
Chaoqun Liu received his B.S. in Mechanical Engineering and Automation from Qingdao University of Science and Technology in 2020 and is currently a Master’s student in Mechanical Engineering from Ocean University of China. His current research direction is compressed air energy storage based on offshore wind power.
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Xu, Z., Yang, H., Xie, Y. et al. Thermodynamic analysis of a novel adiabatic compressed air energy storage system with water cycle. J Mech Sci Technol 36, 3153–3164 (2022). https://doi.org/10.1007/s12206-022-0546-3
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DOI: https://doi.org/10.1007/s12206-022-0546-3