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With the enforcement of international regulations aimed at reducing environmental pollution, various measures and procedures have been proposed to reduce fuel consumption and increase energy effi ciency of ships. Cruising ships that are commonly visiting some of most sensitive and protected sea areas are of particularly interest. This case study outlines measure that can be applied tocruising vessels without installing new or modifi cations of existing systems and will require somewhat increased attention of chief engineer during voyage. Modern medium speed marine diesel engines, out of the total energy contained in the fuel, utilize slightly less than half while the rest is a thermal loss.Therefore, ships are equipped with waste heat recovery systems utilizing the excessive heat of diesel engine exhaust gases and cooling water. The fi ndings in this paper shows that correct selection of parameters in automated control of cooling water temperature results with a signifi cant improvement of diesel engine thermal effi ciency, reduced fuel consumption and improved costs effi ciency. The results are applicable for all similar marine or industrial power systems as well.

Cost efficiency of optimizing automatic temperature control parameters in a diesel engine cooling system on a cruising vessel: A case study