The 34th Asian-Pacific Technical Exchange and Advisory Meeting on Marine Structures Conference, TEAM 2020/21, İstanbul, Turkey, 6 - 08 December 2021, pp.329-335
Low carbon and energy-efficient shipping have been the major concerns for the maritime industry, recently. Operational measures have been taken and the machinery systems have been developed to fulfil the requirements of the International Maritime Organization and to increase the energy efficiency of ships. One of the challenging methods to increase energy efficiency is waste heat recovery (WHR) using the organic Rankine cycle. In this study, the exhaust gas waste heat of a dual-fuel (liquefied natural gas and diesel) engine installed on a tanker is recovered by a regenerative organic Rankine cycle (ORC) system. Thermodynamic and environmental impact analysis of the ORC is conducted and the energy existing ship index under navigation scenarios is calculated to estimate the numerical effect of the ORC integrated power generation system (PGS). Low global warming and zero ozone depletion potential working fluids are selected for ORC and the performances of the fluids are compared. According to the results, the ORC WHR system can increase the thermal efficiency of the PGS by more than 4% leading to a significant decrease in carbon emissions sourced by the tanker.