Extensive techno-economic assessment of combined inverted Brayton – Organic Rankine cycle for high-temperature waste heat recovery

Kirill Abrosimov, Andrea Baccioli, Aldo Bischi

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)

Abstract

This work is a techno-economic study of the combination of inverted Brayton cycle, and organic Rankine cycle (combined IBC-ORC) applied for high-temperature waste heat recovery (WHR) of the engine exhaust energy. In IBC, exhaust gases expand to subatmospheric pressure in the turbine, transmit heat residuals to ORC, and restore pressure to 1 atm in the compressor. The system is analysed in the Aspen Hysys software in design conditions at the case study of 1.4 MW gas-fueled internal combustion engine as a high-temperature waste heat source (470–570 °C). Firstly, the paper shows the performance of the system optimised for different ambient temperatures. The role of water condensation contained in flue gas is emphasised for these bounds. Then, the paper presents a multi-objective optimisation illustrated by Pareto fronts for the objective functions of system electric efficiency and levelized cost of energy (LCOE) in the mentioned range of exhaust temperatures. TOPSIS-based Pareto-front analysis results in recommendations of the best sets of cycle parameters in this trade-off. For exhaust temperatures 470 °C, 520 °C, and 570 °C, optimal configurations identified via TOPSIS methodology demonstrate 10.8%, 12.1%, 13.3% efficiencies with LCOE equal to 185.5 $/MWh, 162.4 $/MWh and 146.1 $/MWh correspondingly.

Original languageEnglish
Article number118406
JournalEnergy
Volume211
DOIs
Publication statusPublished - 15 Nov 2020

Keywords

  • High-temperature exhaust
  • Inverted Brayton cycle
  • Organic Rankine cycle
  • Techno-economic analysis
  • Waste heat recovery

Fingerprint

Dive into the research topics of 'Extensive techno-economic assessment of combined inverted Brayton – Organic Rankine cycle for high-temperature waste heat recovery'. Together they form a unique fingerprint.

Cite this