Design and energy saving analysis of a novel isobaric compressed air storage device in pneumatic systems. (June 2021)

• Record Type: Journal Article
• Authors: Wang, Hu; Tong, Zhengren; Dong, Xin; Xiong, Wei; Ting, David S.-K.; Carriveau, Rupp; Wang, Zhiwen
• Is Part Of: Journal of energy storage. Volume 38(2021)
• Publication Date: 2021-06
• Subjects: Compressed air energy storage -- Isobaric storage -- Energy saving -- Pneumatic system; Energy storage -- Periodicals; Energy storage -- Research -- Periodicals; 621.3126
• DOI: 10.1016/j.est.2021.102614
• Languages: English
• ISSNs: 2352-152X

Abstract

Highlights: A novel isobaric compressed air storage concept is proposed. The profiles of a nonlinear cam transformation mechanism are deduced. Favorable constant-pressure characteristics can be achieved. Isobaric devices can reduce the energy consumption by 18% over traditional isochoric ones. Abstract: Compared with traditional isochoric storage of compressed air in pneumatic systems, isobaric storage possesses many advantages. In this study, a novel isobaric compressed air storage device is proposed by introducing compressed gas energy storage and a nonlinear cam transformation mechanism. The critical profiles on both sides of cam are deduced and the mathematical model of a typical pneumatic system is established under different control modes. A parametric analysis is also conducted to reveal how the energy-saving performance can be affected by several factors. The results show that this new isobaric compressed air storage device presents favorable constant-pressure characteristic and energy-saving performance. With a pneumatic system working pressure of 0.4 MPa, 18% energy savings can be achieved and the compressed air pressure is stable within 2.14%. The working pressure of system has a significant effect on the energy-saving performance and the energy-saving rate decreases with the increasing working pressure. The proposed novel isobaric compressed air storage device provides a new way to reduce pressure and energy consumption of pneumatic systems.