Evaluation of the Economic and Environmental Performance of Low-Temperature Heat to Power Conversion using a Reverse Electrodialysis – Multi-Effect Distillation System

Michael Papapetrou, George Kosmadakis, Francesco Giacalone, Bartolomé Ortega-Delgado, Andrea Cipollina, Alessandro Tamburini and Giorgio Micale
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Michael Papapetrou: Dipartimento di Ingegneria, Università degli Studi di Palermo, Viale delle Scienze, Ed.6., 90128 Palermo, Italy
George Kosmadakis: Ricreation IKE, Technological Park “Lefkippos”, Patriarchou Grigoriou & Neapoleos 27, 15341 Agia Paraskevi, Greece
Francesco Giacalone: Dipartimento di Ingegneria, Università degli Studi di Palermo, Viale delle Scienze, Ed.6., 90128 Palermo, Italy
Bartolomé Ortega-Delgado: Dipartimento di Ingegneria, Università degli Studi di Palermo, Viale delle Scienze, Ed.6., 90128 Palermo, Italy
Andrea Cipollina: Dipartimento di Ingegneria, Università degli Studi di Palermo, Viale delle Scienze, Ed.6., 90128 Palermo, Italy
Alessandro Tamburini: Dipartimento di Ingegneria, Università degli Studi di Palermo, Viale delle Scienze, Ed.6., 90128 Palermo, Italy
Giorgio Micale: Dipartimento di Ingegneria, Università degli Studi di Palermo, Viale delle Scienze, Ed.6., 90128 Palermo, Italy

Energies, 2019, vol. 12, issue 17, 1-26

Abstract: In the examined heat engine, reverse electrodialysis (RED) is used to generate electricity from the salinity difference between two artificial solutions. The salinity gradient is restored through a multi-effect distillation system (MED) powered by low-temperature waste heat at 100 °C. The current work presents the first comprehensive economic and environmental analysis of this advanced concept, when varying the number of MED effects, the system sizing, the salt of the solutions, and other key parameters. The levelized cost of electricity (LCOE) has been calculated, showing that competitive solutions can be reached only when the system is at least medium to large scale. The lowest LCOE, at about 0.03 €/kWh, is achieved using potassium acetate salt and six MED effects while reheating the solutions. A similar analysis has been conducted when using the system in energy storage mode, where the two regenerated solutions are stored in reservoir tanks and the RED is operating for a few hours per day, supplying valuable peak power, resulting in a LCOE just below 0.10 €/kWh. A life-cycle assessment has been also carried out, showing that the case with the lowest environmental impact is the same as the one with the most attractive economic performance. Results indicate that the material manufacturing has the main impact; primarily the metallic parts of the MED. Overall, this study highlights the development efforts required in terms of both membrane performance and cost reduction, in order to make this technology cost effective in the future.

Keywords: reverse electrodialysis; multi-effect distillation; cost; LCOE; waste heat; energy storage; life cycle assessment; environmental impacts; salinity gradient power (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2019
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (5)

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