Assessment on energy and exergy of combined supercritical CO2 Brayton cycles with sizing printed-circuit-heat-exchangers. (15th January 2023)

• Record Type: Journal Article
• Authors: Wang, Yiming; Xie, Gongnan; Zhu, Huaitao; Yuan, Han
• Is Part Of: Energy. Volume 263:Part A(2023)
• Publication Date: 2023-01-15
• Subjects: Combined cycle -- Printed-circuit-heat-exchanger -- Cycle efficiency -- Exergy -- Cold-electricity cogeneration; Power resources -- Periodicals; Power (Mechanics) -- Periodicals; Energy consumption -- Periodicals; 333.7905
• DOI: 10.1016/j.energy.2022.125559
• Languages: English
• ISSNs: 0360-5442

Abstract

Abstract: The supercritical carbon dioxide Brayton cycle is one of the alternative thermal schemes for advanced energy systems. In this study, ammonia absorption Refrigeration-reheat supercritical carbon dioxide Brayton combined cycle is constructed, and the thermodynamic performance of reheat supercritical carbon dioxide Brayton cycle with ammonia absorption refrigeration cycle are analyzed. The characteristics of Brayton cycle and ammonia absorption refrigeration cycle configuring with Printed Circuit Heat Exchanger are analyzed. The result shows that under controlled freezing-point storage condition, optimized combined cycle energy and exergy efficiency is 46% and 64.98%, electricity output and refrigeration capacity is 11.4 MW and 1.78 MW. Under air-conditioning refrigeration condition, optimized combined cycle energy and exergy efficiency is 50.28% and 65.04%, and electricity output and refrigeration capacity is 11.4 MW and 3 MW. Compared with combined cycle performance before optimization, average improvement of cycle energy efficiency, exergy efficiency and exergy destruction is 4.19%, 0.73% and 3.64%, which shows obvious improvement of cycle performance after optimization. Comparative analysis of printed circuit heat exchanger applied at recuperator and subcooler shows that heat transfer performance of single-faced etched printed circuit heat exchanger in straight channel is better than that of double-faced etched printed circuit heat exchanger for same heat transfer and pressure drop. Highlights: New combined supercritical CO2 Brayton cycles with a printed-circuit-heat-exchanger are proposed. Cycle efficiency and heat exchangers performance are assessed and quantitatively analyzed. The combined cycles fully utilize the low-temperature heat under two working conditions. Performance of single-side and double-side printed-circuit-heat-exchanger are compared.