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A comparative exergy-based assessment of direct air capture technologies

Author

Listed:
  • Sina Hoseinpoori

    (Chalmers University of Technology)

  • David Pallarès

    (Chalmers University of Technology)

  • Filip Johnsson

    (Chalmers University of Technology)

  • Henrik Thunman

    (Chalmers University of Technology)

Abstract

The 6th Assessment of the IPCC underlined the need for urgent measures for carbon dioxide removal from the atmosphere, so as to meet the 1.5 °C goal by the end of this century. One option to achieve this is direct air capture (DAC) technologies. This work assesses the thermodynamic performances of different categories of DAC technologies, i.e., adsorption-based, absorption-based, ion exchange, and electrochemical. An exergy analysis is performed on the DAC processes in each category to identify hotspots for efficiency loss within the system. The results show that the consumption of materials is responsible for 5–40% of the exergy consumption of the most-developed DAC processes. Despite their greater use of materials compared to absorption-based processes, adsorption-based processes, together with ion exchange technologies, have the highest exergy efficiencies of the DAC technologies investigated. Moreover, the results highlight the importance of limiting material consumption and electrifying large-scale DAC plants, which cannot run exclusively on waste heat from industrial processes.

Suggested Citation

  • Sina Hoseinpoori & David Pallarès & Filip Johnsson & Henrik Thunman, 2023. "A comparative exergy-based assessment of direct air capture technologies," Mitigation and Adaptation Strategies for Global Change, Springer, vol. 28(7), pages 1-20, October.
    • Handle: RePEc:spr:masfgc:v:28:y:2023:i:7:d:10.1007_s11027-023-10076-3
    DOI: 10.1007/s11027-023-10076-3
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    References listed on IDEAS

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