Title: Exergy-environmental analysis and optimisation of the modified organic Rankine cycle driven by geothermal and biomass energies

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 this paper, thermodynamic analysis and optimisation studies are investigated on an ORC for multi-generation using geothermal and biomass energies. Results indicated that the ORC is responsible for 65% of the total exergy destruction rate. The produced hydrogen and freshwater rates are 1.264 lit/s and 5.9 kg/s, respectively. By increasing the temperature of the geothermal source from 400 K to 430 K, the hydrogen and freshwater production rates increase to 19.6% and 17.6%. If all energy is supplied by biomass, the amount of emitted CO₂ will increase to 60.3%.

Keywords: organic Rankine cycle; ORC; exergy; environmental; hydrogen; desalination; optimisation.

DOI: 10.1504/IJEX.2023.128776

International Journal of Exergy, 2023 Vol.40 No.2, pp.144 - 161

Received: 13 Nov 2021
Received in revised form: 13 Apr 2022
Accepted: 15 Apr 2022
Published online: 03 Feb 2023 *

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