Assessment of ternary CO2 mixtures as working fluids in supercritical Brayton cycles with floating critical points

被引:10
作者
Zheng, Nan [1 ]
Li, Ziyang [1 ]
Luo, Yiyang [1 ]
Fang, Jiabin [1 ]
Wei, Jinjia [1 ,2 ,3 ]
机构
[1] Xi An Jiao Tong Univ, Sch Environm & Chem Engn, Xian 710049, Peoples R China
[2] Xi An Jiao Tong Univ, State Key Lab Multiphase Flow Power Engn, Xian 710049, Peoples R China
[3] 28 Xianning West Rd, Xian 710049, Shaanxi, Peoples R China
基金
中国国家自然科学基金;
关键词
Supercritical Brayton cycle; Floating critical points; Ternary CO 2 mixture; Design -point performance; Concentrated solar power; CO2-BASED BINARY-MIXTURE; COOLING SYSTEM; DESIGN; PERFORMANCE;
D O I
10.1016/j.csite.2023.103756
中图分类号
O414.1 [热力学];
学科分类号
摘要
The performance of the supercritical CO2 (sCO2) Brayton cycle deteriorates due to the mismatch between critical temperature and cold source temperature. An innovative solution based on ternary CO2 mixtures with adjustable compositions is proposed to expand the variation range of the critical temperature. An in-house MATLAB code is developed to investigate the design-point performance of the proposed system. The results indicate that the effect of improving cycle ef-ficiency by using the modified floating critical point method becomes increasingly significant as the target critical temperature deviates from that of CO2. The CO2-H2S-Kr is screened out as the best ternary mixture, with the cycle efficiency being increased by over 8 % compared to the sCO2 cycle at very high (45 degrees C) and low (-15 degrees C) temperatures. The long-term performance is also evaluated based on the hourly historical weather data of two typical climate regions. The annual performance depends on both the average value and the distribution characteristics of the local ambient temperature. A relative improvement in annual average efficiency of 7%-9.56 % can be obtained depending on the regions. The present work is helpful to make the supercritical Brayton cycle give full play to its efficiency advantage in a wide cold source temperature range.
引用
收藏
页数:19
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