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Energies 2017, 10(4), 547; doi:10.3390/en10040547

A Comparison of Organic and Steam Rankine Cycle Power Systems for Waste Heat Recovery on Large Ships

Department of Mechanical Engineering, Technical University of Denmark, Building 403, Nils Koppels Allé, DK-2800 Kgs. Lyngby, Denmark
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Academic Editor: George Kosmadakis
Received: 15 February 2017 / Revised: 24 March 2017 / Accepted: 11 April 2017 / Published: 17 April 2017
(This article belongs to the Special Issue Waste Heat Recovery)
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Abstract

This paper presents a comparison of the conventional dual pressure steam Rankine cycle process and the organic Rankine cycle process for marine engine waste heat recovery. The comparison was based on a container vessel, and results are presented for a high-sulfur (3 wt %) and low-sulfur (0.5 wt %) fuel case. The processes were compared based on their off-design performance for diesel engine loads in the range between 25% and 100%. The fluids considered in the organic Rankine cycle process were MM(hexamethyldisiloxane), toluene, n-pentane, i-pentane and c-pentane. The results of the comparison indicate that the net power output of the steam Rankine cycle process is higher at high engine loads, while the performance of the organic Rankine cycle units is higher at lower loads. Preliminary turbine design considerations suggest that higher turbine efficiencies can be obtained for the ORC unit turbines compared to the steam turbines. When the efficiency of the c-pentane turbine was allowed to be 10% points larger than the steam turbine efficiency, the organic Rankine cycle unit reaches higher net power outputs than the steam Rankine cycle unit at all engine loads for the low-sulfur fuel case. The net power production from the waste heat recovery units is generally higher for the low-sulfur fuel case. The steam Rankine cycle unit produces 18% more power at design compared to the high-sulfur fuel case, while the organic Rankine cycle unit using MM produces 33% more power. View Full-Text
Keywords: waste heat recovery; organic Rankine cycle; steam Rankine cycle; off-design; turbine efficiency; diesel engine; marine vessel; container ship; maritime; sustainability; low sulfur fuel waste heat recovery; organic Rankine cycle; steam Rankine cycle; off-design; turbine efficiency; diesel engine; marine vessel; container ship; maritime; sustainability; low sulfur fuel
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Andreasen, J.G.; Meroni, A.; Haglind, F. A Comparison of Organic and Steam Rankine Cycle Power Systems for Waste Heat Recovery on Large Ships. Energies 2017, 10, 547.

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