Dynamic modeling and response characteristics of closed CO2 cycle with Li/SF6 fuel boiler to external disturbances

Jiaqi Feng, Enbo Zhang and Bofeng Bai

Energy, 2024, vol. 312, issue C

Abstract: High-energy density power propulsion technology is of urgent demands for UUVs. In this paper, a novel closed transcritical CO2 cycle combining Li/SF6 fuel boiler is proposed, which has higher efficiency and energy density. To understand the dynamic response characteristics of this system in UUVs application environment, the dynamic simulation model was established and the dynamic response characteristics of the system to external parameter disturbances such as heat source heat load, cold source temperature, turbomachinery speed and their coupled disturbances were investigated. The results show that CO2 mass flow rate needs to be adjusted when the heat load disturbance of heat source exceeds 10 % to avoid overheat. The cycle pressure is not only affected by the turbomachinery speed disturbance, but also by CO2 density change caused by compressor inlet temperature disturbance. The response time of cycle pressure to turbomachinery speed disturbance is shorter than that to compressor inlet temperature. The transcritical CO2 cycle with the compression from gas phase is more resistant to clod source temperature disturbances than S-CO2 Brayton cycle. Inventory control is required to ensure the stability of compressor inlet status. This study provides insights into developing the novel high-energy density power systems for UUVs.

Keywords: Transcritical CO2 cycle; Supercritical CO2 cycle; Dynamic response characteristics; External parameter disturbances; Marine environment (search for similar items in EconPapers)
Date: 2024
References: View references in EconPapers View complete reference list from CitEc
Citations:

Downloads: (external link)
http://www.sciencedirect.com/science/article/pii/S0360544224034467
Full text for ScienceDirect subscribers only

Related works:
This item may be available elsewhere in EconPapers: Search for items with the same title.

Export reference: BibTeX RIS (EndNote, ProCite, RefMan) HTML/Text

Persistent link: https://EconPapers.repec.org/RePEc:eee:energy:v:312:y:2024:i:c:s0360544224034467

DOI: 10.1016/j.energy.2024.133668

Access Statistics for this article

Energy is currently edited by Henrik Lund and Mark J. Kaiser

More articles in Energy from Elsevier
Bibliographic data for series maintained by Catherine Liu ().