Energy, conventional exergy and advanced exergy analysis of cryogenic recuperative organic rankine cycle

Zhen Tian, Xiaochen Chen, Yuan Zhang, Wenzhong Gao, Wu Chen and Hao Peng

Energy, 2023, vol. 268, issue C

Abstract: In this study, a recuperative organic Rankine cycle (ORC) was designed with a three-fluid condenser for cryogenic cold energy recovery. An experimental setup with R290 as working fluid was constructed. Hot water and liquid nitrogen were the heat source and heat sink, respectively. The ORC performances were investigated under different heat source temperatures and heat sink flow rates. Both conventional and advanced exergy analyses were carried out based on the obtained experimental data. The optimum working condition was identified as the heat sink flow rate at 100 kg/h and heat source temperature at 45 °C. The results showed that the largest net power of the cryogenic recuperative ORC was 1.02 kW, the maximum thermal efficiency was 8.8%, and the maximum cold energy utilization efficiency was 22.5%. The conventional exergy analysis identified the condenser, which accounted for 62.6% of the total exergy destruction, as the priority of system optimization. However, the priority was ascribed to the expander based on the advanced exergy analysis, which showed that the avoidable endogenous exergy destruction rate of the expander was up to 54.0%. The findings would provide technical guidelines for the development and performance optimization of cryogenic ORCs.

Keywords: Advanced exergy analysis; Organic rankine cycle; Cryogenic cold energy utilization; Exergy destruction; Optimum operating conditions (search for similar items in EconPapers)
Date: 2023
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Citations: View citations in EconPapers (7)

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Persistent link: https://EconPapers.repec.org/RePEc:eee:energy:v:268:y:2023:i:c:s0360544223000427

DOI: 10.1016/j.energy.2023.126648

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