Entropy-driven approach to irreversibility management in ship engines
摘要
Efficiency-based approaches in motor technologies are generally considered in relation to operational parameters. However, the choice of operating frequencies within the system should also be seen as a parametric reason. In ship design processes, design preferences will affect not only the main machine but all auxiliary machines. This study, modeled within this scope, examined the impact of frequency selection on efficiency. Using a simulation-based model derived from two marine diesel engines operating at different frequency outputs, energy and environmental impact assessments based on entropy approach were conducted, and the performance impacts were evaluated. Analyses were conducted under comparative operating conditions at 50 Hz and 60 Hz frequencies using a holistic thermodynamic and environmental approach. The results showed that 50 Hz engines exhibited approximately 15.59% higher performance efficiency than the 60 Hz engine group. In contrast, 60 Hz engines exhibited greater irreversibility due to significant exergy loss. Furthermore, when entropy generation is considered, 50 Hz engines were found to be 2.38% more environmentally friendly in terms of the environmental performance index (EPI). Based on these data, the decarbonization inefficiency of 60 Hz engines indicated a 2.72% higher potential than 50 Hz engines. At the end of the study, suggestions for the effectiveness and applicability of the entropy approach in engine selection are also presented.