Title: Thermo-economic analysis of a combined flash-binary geothermal cycle with a transcritical CO₂ cycle to produce green hydrogen

Authors: Mohammad Ali Sabbaghi; Mohammad Sefid

Addresses: Department of Mechanical Engineering, Yazd University, Yazd, Iran ' Department of Mechanical Engineering, Yazd University, Yazd, Iran

Abstract: In recent years, the increasing trend of population has led to an increase in energy demand in the world. In this study, a combined cycle with two flash chambers is proposed to provide energy for a transcritical CO₂ cycle. The obtained results provide that the proposed cycle has energy and exergy efficiencies of 5.79% and 28.06%, respectively, and can produce 3.99 lit/s of hydrogen. The PEM electrolyser requires the most investment with a cost rate of $1.8/hr. Comparing the present cycle with previous studies reveals that the proposed cycle has better performance.

Keywords: thermo-economic; CO₂ transcritical cycle; geothermal; hydrogen.

DOI: 10.1504/IJEX.2024.136929

International Journal of Exergy, 2024 Vol.43 No.2, pp.110 - 122

Received: 31 Mar 2023
Accepted: 08 Oct 2023
Published online: 29 Feb 2024 *

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