RT Journal Article ID 19f9dacc0ed55dcd A1 Hu, Lian A1 Chen, Deqi A1 Gao, Shiqiu A1 Cao, Yiding T1 THERMODYNAMIC AND HEAT TRANSFER ANALYSES OF THE S−CO2 BRAYTON CYCLE AS THE HEAT TRANSPORT SYSTEM OF A NUCLEAR REACTOR JF Heat Transfer Research JO HTR YR 2016 FD 2016-09-19 VO 47 IS 10 SP 907 OP 925 K1 supercritical carbon dioxide K1 Brayton cycle K1 nuclear reactor K1 cycle efficiency AB A systematic thermodynamic analysis is presented for a recompression S−CO2 Brayton cycle incorporating a flow split between the main and recompressing compressors, a high-temperature recuperator (HTR), and a low-temperature recuperator (LTR). It is found that the efficiency of the Brayton cycle can reach 44.9% with a moderate reactor core outlet temperature of 650°C. The results represent a significant improvement over the Brayton cycle using helium as a working fluid in terms of the cycle efficiency and a substantially lowered reactor working temperature. However, the heat transfer amounts of the recuperators (including HTR and LTR) are found to be very high and the exchanged heat in the HTR is about twice as much as the reactor power output. Printed circuit heat exchangers (PCHEs), which have the characteristics of high effectiveness and compactness, are used as heat exchangers in the Brayton cycle. The use of this heat exchanger can effectively decrease the volumes and costs of both the HTR and LTR. Based on the comprehensive analysis, optimized working conditions of the S−CO2 Brayton cycle are also recommended in this paper. PB Begell House LK https://www.dl.begellhouse.com/journals/46784ef93dddff27,2310300256b05abd,19f9dacc0ed55dcd.html