The thesis is an introduction to the operation and understanding of the cooling mechanisms of a closed cooling system of an electric outboard drive for smaller boats. The analysis of the system was divided into the problems of the hydraulic system and the way the heat is transferred to the environment. Using the data sheets of the system components, we confirmed the adequacy of the design and pointed out possible problems. On the basis of measurements and calculations, we described the pressure conditions in the system. The characteristics of the hydraulic system helped us to select a suitable pump, which we tested in a durability test as the main component of the system. As another important component of the system, we analysed the refrigerant and alternatives to it in more detail. We made an overview of the main heat sources and sinks in the system and calculated the ratios between the individual heat outputs. Based on the system analyses, we then proposed optimizations of critical components from the hydraulic and heat transfer point of view. We also presented the methods for testing drives from the viewpoint of the cooling system in the field and in the test facility designed for sustainable testings of drives. We compared and analysed the results obtained with different test methods.
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