Title: Multi-objective optimisation of a new multi-generation system integrating waste heat recovery, and geothermal resources to produce power, hydrogen, heating and cooling

Authors: Mohammad Ali Sabbaghi; Mohammad Sefid

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

Abstract: This study investigates a new multi-generation system through the integration of geothermal energy, waste heat, organic Rankine cycle (ORC), proton exchange membrane electrolyser (PEME) and water-ammonia absorption chiller cycle. The impact of various effective parameters on system performance is evaluated and the system is optimised based on three viewpoints. The obtained results show that the turbine production power is 101.2 kW, the hydrogen production rate is 1.467 kg/h, and the amount of cooling generated in the evaporator, 65.48 kW, is determined. The heat released in the de-superheater amounts to 81.79 kW, which is utilised to operate the absorption chiller.

Keywords: multi-generation system; absorption chiller cycle; geothermal; heat recovery; optimisation.

DOI: 10.1504/IJEX.2025.146398

International Journal of Exergy, 2025 Vol.47 No.1, pp.49 - 63

Received: 25 Aug 2024
Accepted: 27 Oct 2024
Published online: 28 May 2025 *

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