Thermo-Economic Study of a Regenerative Dual-Loop ORC System Coupled to the Main Diesel Engines of a General Support Vessel

Athanasios G. Vallis, Theodoros C. Zannis, Elias A. Yfantis, Efthimios G. Pariotis, John S. Katsanis and Konstantina D. Asimakopoulou
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Athanasios G. Vallis: Naval Architecture and Marine Engineering Section, Hellenic Naval Academy, 18539 Piraeus, Greece
Theodoros C. Zannis: Naval Architecture and Marine Engineering Section, Hellenic Naval Academy, 18539 Piraeus, Greece
Elias A. Yfantis: Naval Architecture and Marine Engineering Section, Hellenic Naval Academy, 18539 Piraeus, Greece
Efthimios G. Pariotis: Naval Architecture and Marine Engineering Section, Hellenic Naval Academy, 18539 Piraeus, Greece
John S. Katsanis: Naval Architecture and Marine Engineering Section, Hellenic Naval Academy, 18539 Piraeus, Greece
Konstantina D. Asimakopoulou: Department of Engineering, School of Sciences and Engineering, University of Nicosia, Nicosia 24005, Cyprus

Energies, 2020, vol. 13, issue 11, 1-45

Abstract: A thermo-economic analysis of a regenerative dual-loop organic Rankine cycle (ORC) is conducted, which will be coupled with the main diesel engines of a general support vessel. An energy and exergy analysis of the regenerative dual-loop ORC is conducted. The energy and exergy analysis results of the regenerative dual-loop ORC are compared with pertinent results for a simple dual-loop ORC without regeneration. A mission analysis that was based on a vessel speed profile with the proposed ORC was conducted. A heat transfer analysis was performed for dimensioning the heat exchangers of both ORC loops. Finally, an economic analysis is conducted to calculate the total capital cost and the payback period of the proposed ORC. The results showed that the proposed ORC is thermodynamically superior in both energetic and exergetic terms compared to the simple dual-loop ORC. The total fuel cost saving is 337,493 Euros, the total CO 2 emission saving is 1,153,416.4 kg, and the SO 2 emission saving is 36,044.3 kg. The total capital cost of the proposed ORC is 2,546,000 Euros. Finally, the installation of the proposed ORC in the examined vessel is economically feasible because it results in a reasonable payback period, which is less than nine years.

Keywords: waste heat recovery; ORC; dual-loop; regeneration; heat exchangers; capital cost (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: 2020
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