Techno-economic investigation of alternative propulsion systems for fishing vessels

Abstract

Main objective of this thesis is to analyze the techno-economic aspects of the propulsion chain and power supply units in fisheries. The global agricultural sector is vital for supporting the food needs of the growing population, contributing to national economies, and creating new job opportunities. Aquaculture forms the marine interest of this system. Fishing, a significant component of marine and ocean aquaculture, not only provides food but also supports economic development and consumer welfare in many countries. However, overfishing and technological advancements have led to decline in fish populations over time. This has made the implementation of sustainable management systems imperative. This study provides information on agricultural activities, fish production processes, and fish farming and fishing in Turkey. As it is known, the Republic of Turkey is surrounded by seas on three sides. This situation highlights the importance of aquaculture and fishing for our country. The study identifies fundamental challenges such as environmental pollution, regulatory issues, and technological inadequacies resulting from this fishing and aquaculture. Main focus of the thesis is the analysis of power systems used in fishing vessels, including diesel, hybrid, LNG (Liquefied Natural Gas), and dual-fuel systems. The research examines the detailed operation schedules of predetermined vessels, the devices used in operations, the annual fuel energy consumption of alternative fuel systems, lubrication oil usage, initial investment costs, and long-term operational costs. The study also provides a comprehensive cost-benefit analysis over a 20-year period by evaluating the life cycle costs of these propulsion systems. The cost efficiency and effectiveness of the most commonly used diesel systems are examined. Additionally, the potential of hybrid systems, which combine diesel and electric power, to reduce fuel consumption and emissions is evaluated. The LNG systems, an emerging and promising alternative fuel, are assessed for their environmental benefits and economic feasibility. The comparative analysis of these systems aims to identify the most sustainable and cost-effective options for the fishing industry. Techno-economic indicators are used to evaluate how the introduction of different fuel types will impact the fishing community. The study examines factors such as employment, income levels, and the overall economic well-being of fishermen to understand the socio-economic changes brought by these new systems. The importance of integrating techno-economic indicators with biological indicators to ensure the sustainability of fishery resources is emphasized. The analyses show that diesel systems still maintain their validity for the fishing industry. However, it is observed that hybrid, LNG, and dual-fuel propulsion systems have minimal environmental impact when examined in the long term. It is found that this minimal environmental impact can also provide economic benefits in the long term. This situation underscores the need for governments, fishing fleet owners, and fishing vessel operators to work together to promote more sustainable and technologically supported measures for the future of fishing. In conclusion, this thesis also provides some valuable insights for stakeholders in the fishing industry, including boat owners, fishermen, and policy-makers, to make informed decisions that balance economic efficiency with environmental sustainability. The recommendations aim to promote the adoption of cleaner and more efficient fuel technologies, ensuring the long-term sustainability of the fishing industry and the preservation of marine resources.