Preprint Article Version 1 Preserved in Portico This version is not peer-reviewed

Thermodynamic Optimization and Economic Evaluation of a High-Temperature Triple Organic Rankine Cycle System

Pengcheng Li
,
Chengxing Shu
,
Jing Li
* ORCID logo ,
Yandong Wang
,
Yanxin Chen
,
Xiao Ren
,
Desuan Jie
,
Xunfen Liu
Version 1 : Received: 1 November 2023 / Approved: 1 November 2023 / Online: 1 November 2023 (03:11:16 CET)

A peer-reviewed article of this Preprint also exists.

Li, P.; Shu, C.; Li, J.; Wang, Y.; Chen, Y.; Ren, X.; Jie, D.; Liu, X. Thermodynamic Investigation and Economic Evaluation of a High-Temperature Triple Organic Rankine Cycle System. Energies 2023, 16, 7818. Li, P.; Shu, C.; Li, J.; Wang, Y.; Chen, Y.; Ren, X.; Jie, D.; Liu, X. Thermodynamic Investigation and Economic Evaluation of a High-Temperature Triple Organic Rankine Cycle System. Energies 2023, 16, 7818.

Abstract

The efficiencies of conventional triple organic Rankine cycle (TORC) configurations are restricted by the low critical temperatures of common working fluids (＜320 °C). This paper proposes a high-temperature TORC system. A near-azeotropic mixture biphenyl/diphenyl oxide (BDO), which has stellar track record in the high-temperature ORC applications, is innovatively adopted as the top and middle ORC fluid simultaneously. The top cycle evaporation temperature is up to 400 °C in view of BDO’s high stability. Five conventional organic fluids are chosen for the bottom ORC. Fundamentals of the TORC system are illustrated, and mathematical models are built. Thermo-economic performance is investigated. The results hint that the optimal thermodynamic property is achieved on the use of benzene as the bottom fluid. The maximum thermal and exergy efficiencies are respectively 40.86% and 74.14%. The largest irreversible loss occurs inside the heat exchanger coupling the middle and bottom ORCs, accounting for above 30% of the total entropy generation. The levelized energy cost (LEC) is 0.0284 $/kWh. Given the same heat source condition, the TORC system can boost efficiency by 1.02% and drive down LEC by 0.0024 $/kWh compared with a BDO mixture-based cascade ORC.

Keywords

Triple organic Rankine cycle; Biphenyl/diphenyl oxide; Thermal efficiency; Exergy efficiency; Levelized energy cost

Subject

Engineering, Energy and Fuel Technology

Copyright: This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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