Thermoeconomic assessments and optimization of a vapour compression and an ejector integrated sCO2 trigeneration systems

Hakan Çetin, Tuğberk; Zhu, Jie

Abstract

Two sCO2 trigeneration systems are proposed in this study to supply power, heating and cooling simultaneously, one is a vapour compression recuperation system (VCRS), the other is an ejector integrated recuperation system (EIRS). Their performance assessments are conducted from thermoeconomic point of view. In a recuperative base case scenario with cooling capacity of 100 kW, the transcritical VCRS has the ability to provide 46.5 kW power output with the trigeneration utilization efficiency of 160 % and exergy efficiency of 49.92 %, while the transcritical EIRS can deliver 54.43 kW power with the trigeneration utilization efficiency of 158 % and exergy efficiency of 54.41 %. The effects of key operational parameters are evaluated, including the maximum cycle pressure, minimum and maximum power cycle temperatures, evaporation temperature and trade-offs between thermoeconomic points. Multi-objective optimization is carried out based on the identified trade-offs. It is found that the VCRS exergy efficiency increases 4.51 % when the minimum exergy cost rate rises 13 %, the EIRS exergy efficiency improves 4.21 % as the minimum exergy cost rate goes up 14 %.

Citation

Hakan Çetin, T., & Zhu, J. (2022). Thermoeconomic assessments and optimization of a vapour compression and an ejector integrated sCO2 trigeneration systems. Sustainable Energy Technologies and Assessments, 54, Article 102832. https://doi.org/10.1016/j.seta.2022.102832

• Journal Article Type: Article
• Acceptance Date: Oct 10, 2022
• Online Publication Date: Oct 18, 2022
• Publication Date: Dec 1, 2022
• Deposit Date: Oct 18, 2022
• Publicly Available Date: Oct 18, 2022
• Journal: Sustainable Energy Technologies and Assessments
• Print ISSN: 2213-1388
• Publisher: Elsevier BV
• Peer Reviewed: Peer Reviewed
• Volume: 54
• Article Number: 102832
• DOI: https://doi.org/10.1016/j.seta.2022.102832
• Keywords: Energy Engineering and Power Technology; Renewable Energy, Sustainability and the Environment
• Public URL: https://nottingham-repository.worktribe.com/output/12612525
• Publisher URL: https://www.sciencedirect.com/science/article/pii/S2213138822008803?via%3Dihub
• Additional Information: This article is maintained by: Elsevier; Article Title: Thermoeconomic assessments and optimization of a vapour compression and an ejector integrated sCO2 trigeneration systems; Journal Title: Sustainable Energy Technologies and Assessments; CrossRef DOI link to publisher maintained version: https://doi.org/10.1016/j.seta.2022.102832; Content Type: article; Copyright: © 2022 The Author(s). Published by Elsevier Ltd.