A multi-generation system based on geothermal driven: energy, exergy, economic and exergoenvironmental (4E) analysis for combined power, freshwater, hydrogen, oxygen, and heating production

Hassan Hajabdollahi, Amin Saleh and Mohammad Shafiey Dehaj ()
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Hassan Hajabdollahi: Vali-e-Asr University of Rafsanjan
Amin Saleh: Vali-e-Asr University of Rafsanjan
Mohammad Shafiey Dehaj: Vali-e-Asr University of Rafsanjan

Environment, Development and Sustainability: A Multidisciplinary Approach to the Theory and Practice of Sustainable Development, 2024, vol. 26, issue 10, No 75, 26415-26447

Abstract: Abstract Renewable energy is one of environmentally friendly strategies to reduce the environmental pollution caused by energy generation from fossil fuels and reach sustainable development. In this current study, a geothermal driven multi-generation system to provide power, heating, freshwater, hydrogen and oxygen demands is investigated. The main components are encompassed single-pressure organic Rankine cycle, reverse osmosis desalination unit, domestic water heater and proton exchange membrane electrolyzer. For this purpose, energy, exergy, economic and exergoenvironmental (4E) evaluations are accomplished upon proposed system. Non-dominant sorting genetic algorithm has been considered as optimization method that leads to reveal the maximum and minimum of exergy efficiency and total annual cost (TAC) rate as two objective functions. In addition, sensitivity analysis is performed to reveal the roles of design parameters on the system performance and productivity from different standpoints. The optimal results showed that exergy efficiency and TAC increased, as operating temperature of PEM electrolyzer enhances. In terms of economic analysis, the most percentage of total investment cost is pertained to RO unit which was 58.05%. In addition, exergy efficiency and TAC of the proposed system were 30.42% and 255.96 $/h, respectively. As well, the mass flow rate of freshwater, hydrogen, oxygen, net power output and heating production were obtained 3146.7 m3/day, 0.42 m3/day, 3.35 m3/day, 1556.2 kW and 18,586 kW, respectively. Furthermore, by taking into account exergoenvironmental analysis, the environmental impact rate of power, heating, freshwater and hydrogen–oxygen production 2.331 × 10−5 pts/kJh, 3.668 × 10−3 pts/kJh, 1.45 pts/m3h and 11.42 pts/kgh, respectively. Eventually, the optimal outcomes from various perspectives were compared and argued.

Keywords: Life cycle assessment; Freshwater and hydrogen production; Total annual cost; Geothermal power plant; Organic Rankine cycle; Multi-objective optimization (search for similar items in EconPapers)
Date: 2024
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DOI: 10.1007/s10668-023-03735-7

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