{"title":"Performance evaluation of supercritical CO2 Brayton cycle with two-stage compression and intercooling","authors":"Jiahui Jiang, Yongqiang Yu, Yuanyang Zhao, Guangbin Liu, Qichao Yang, Yunxia Liu, Liansheng Li","doi":"10.1016/j.csite.2024.105503","DOIUrl":null,"url":null,"abstract":"Due to its small structures and high energy efficiency, the Brayton cycle using supercritical carbon dioxide (sCO<ce:inf loc=\"post\">2</ce:inf>) can be implemented in various energy industries. The simulation model for a sCO<ce:inf loc=\"post\">2</ce:inf> recompression Brayton (RB) system with a two-stage compression and intercooling process (TCIP) is developed. At the design working conditions, there are minimum and optimum split ratios for the sCO<ce:inf loc=\"post\">2</ce:inf> RB with TCIP cycle. The sCO<ce:inf loc=\"post\">2</ce:inf> RB with TCIP cycle has a broader range of split ratios compared to the RB cycle. The sCO<ce:inf loc=\"post\">2</ce:inf> RB with TCIP cycle can achieve a minimum split ratio of 0.315, compared to 0.36 for the sCO<ce:inf loc=\"post\">2</ce:inf> RB cycle. The maximum efficiency of the sCO<ce:inf loc=\"post\">2</ce:inf> RB with TCIP cycle is 50.95 %, which surpasses the efficiency of the sCO<ce:inf loc=\"post\">2</ce:inf> RB cycle by 3.14 %. There exists an optimal value for the first-stage pressure ratio because the maximum efficiency of the sCO<ce:inf loc=\"post\">2</ce:inf> RB with the TCIP system tends to increase and then decrease with the increase in the first-stage pressure ratio. The pressure ratio of 1.1 for the first-stage compressor, corresponding to an interstage pressure of 8.25 MPa, maximizes the efficiency of the sCO<ce:inf loc=\"post\">2</ce:inf> RB with the TCIP cycle. The results can be used to further explore the applicability of sCO<ce:inf loc=\"post\">2</ce:inf> RB with TCIP.","PeriodicalId":9658,"journal":{"name":"Case Studies in Thermal Engineering","volume":"3 1","pages":""},"PeriodicalIF":6.4000,"publicationDate":"2024-11-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Case Studies in Thermal Engineering","FirstCategoryId":"5","ListUrlMain":"https://doi.org/10.1016/j.csite.2024.105503","RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"THERMODYNAMICS","Score":null,"Total":0}
引用次数: 0
Abstract
Due to its small structures and high energy efficiency, the Brayton cycle using supercritical carbon dioxide (sCO2) can be implemented in various energy industries. The simulation model for a sCO2 recompression Brayton (RB) system with a two-stage compression and intercooling process (TCIP) is developed. At the design working conditions, there are minimum and optimum split ratios for the sCO2 RB with TCIP cycle. The sCO2 RB with TCIP cycle has a broader range of split ratios compared to the RB cycle. The sCO2 RB with TCIP cycle can achieve a minimum split ratio of 0.315, compared to 0.36 for the sCO2 RB cycle. The maximum efficiency of the sCO2 RB with TCIP cycle is 50.95 %, which surpasses the efficiency of the sCO2 RB cycle by 3.14 %. There exists an optimal value for the first-stage pressure ratio because the maximum efficiency of the sCO2 RB with the TCIP system tends to increase and then decrease with the increase in the first-stage pressure ratio. The pressure ratio of 1.1 for the first-stage compressor, corresponding to an interstage pressure of 8.25 MPa, maximizes the efficiency of the sCO2 RB with the TCIP cycle. The results can be used to further explore the applicability of sCO2 RB with TCIP.
期刊介绍:
Case Studies in Thermal Engineering provides a forum for the rapid publication of short, structured Case Studies in Thermal Engineering and related Short Communications. It provides an essential compendium of case studies for researchers and practitioners in the field of thermal engineering and others who are interested in aspects of thermal engineering cases that could affect other engineering processes. The journal not only publishes new and novel case studies, but also provides a forum for the publication of high quality descriptions of classic thermal engineering problems. The scope of the journal includes case studies of thermal engineering problems in components, devices and systems using existing experimental and numerical techniques in the areas of mechanical, aerospace, chemical, medical, thermal management for electronics, heat exchangers, regeneration, solar thermal energy, thermal storage, building energy conservation, and power generation. Case studies of thermal problems in other areas will also be considered.