A performance recovery coefficient for thermal-hydraulic evaluation of recuperator in supercritical carbon dioxide Brayton cycle

被引:58
作者
Li, X. L. [1 ]
Tang, G. H. [1 ]
Fan, Y. H. [1 ]
Yang, D. L. [1 ]
机构
[1] Xi An Jiao Tong Univ, Sch Energy & Power Engn, MOE Key Lab Thermofluid Sci & Engn, Xian 710049, Peoples R China
基金
中国国家自然科学基金;
关键词
Printed circuit heat exchanger; Supercritical carbon dioxide Brayton cycle; Thermal-hydraulic evaluation; Cycle efficiency; Performance recovery coefficient; CIRCUIT HEAT-EXCHANGER; CHANNEL; DESIGN; OPTIMIZATION; ZIGZAG; FINS; STRAIGHT; MODELS;
D O I
10.1016/j.enconman.2022.115393
中图分类号
O414.1 [热力学];
学科分类号
摘要
Recuperator is an important component in supercritical carbon dioxide Brayton cycle. However, open literature mainly focused on the performance of recuperator in component scale but the effect of its thermal-hydraulic performance on the cycle efficiency was seldom concerned. Besides, to be more convenient in practical appli-cations, a criterion for thermal-hydraulic evaluation of recuperators in supercritical carbon dioxide Brayton cycle is needed to avoid the coupling analysis of recuperator design and cycle design. In the present study, an integrated model is developed by combining the supercritical carbon dioxide Brayton cycle with the recuperator of a printed circuit heat exchanger. Based on the integrated model, the effects of design parameters of recu-perator on the cycle performance are discussed. It is shown that ultra-large Reynolds number and effectiveness fail to improve the cycle efficiency and are not recommended due to the caused large pressure drop. The effects of conventional performance evaluation criteria and the ratio of heat transfer rate to pressure drop on cycle efficiency are also examined. It is indicated that the existing criteria are not sufficient to evaluate the effect of recuperator channel configuration on cycle efficiency. The performance recovery coefficient with value between 0 and 1 is finally proposed and validated to be an effective and convenient criterion as well as straightforward to various cycle layouts with other types of recuperators.
引用
收藏
页数:13
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