Abstract
This Paper presented the reduction methods of <TEX>$CO_2$</TEX> emission from ships during voyage. In order to decrease <TEX>$CO_2$</TEX> emission during voyage the equation was established and conducted the study about the relationship between ship speed, the propulsive efficiency and its <TEX>$CO_2$</TEX> production. The results obtained from the examinations are as follows : 1. <TEX>$CO_2$</TEX> emission from sailing ships can be decreased by reducing specific fuel oil consumption of main diesel engine, coefficient of total resistance and ship speed and also by increasing propeller efficiency. 2. Diesel-electric propulsion system is more effective than diesel-mechanical system to decrease the level of <TEX>$CO_2$</TEX> emission during long voyage. 3. Good condition of ship's hull surface, rudder and propeller's surface can decrease the quantity of fuel oil and <TEX>$CO_2$</TEX> emission by reducing the resistance of ship that can rise the propeller efficiency 4. <TEX>$CO_2$</TEX> emitted from ships can be decreased in a global scale by giving attention to the synthetic transport efficiency.
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