Climate change is a global challenge that is expected to impact both present and future
generations. In recent years, the Earth's atmosphere has undergone significant changes. Scientific studies demonstrate that climate change has progressed gradually and is directly associated with increasing concentrations of carbon dioxide (CO₂) and methane (CH₄) in the atmosphere. These two gases, especially CO₂, influence the planet’s temperature. Due to the anticipated growth in international trade, pollution from shipping is expected to increase. This makes it essential to implement measures specifically tailored to the characteristics of the maritime sector to mitigate
emissions. In line with the commitment of the shipping industry to reduce greenhouse gas emissions by at least 50% by 2050, new technologies have been developed. The international community is also taking action to address climate change. This PhD thesis examines different types of waste heat recovery technologies onboard ocean-going ships, to assess their technical principles and application feasibility. The study is driven by the need to reduce carbon dioxide emissions from combustion processes worldwide, as part of the broader effort to address greenhouse gas emissions and reduce reliance on hydrocarbons as fuel. A thermo-economic analysis is performed
to enhance the understanding of available options and to support the Modelling and Optimisation of Main Diesel Engine Waste Heat Powered Systems Based on Dual-Loop Cycles, aiming to improve both fuel consumption and emissions.