15℃ 냉각수 공급 조건 단열 다심관의 전기케이블 활용 가능성

Abstract

Abstract The International Maritime Organization has adopted the Polar code to strengthen safety regulations for vessels sailing in polar regions in response to the increasing demand for ships operating in polar regions worldwide. Furthermore, ongoing active research and development is being carried out in the field of electric propulsion ships to strengthen the response to emission control regulations in the maritime industry. Based on previous research, our research team determined that there is a need for various studies on insulated multi-core tubes developed as ship components for operating under extreme conditions. Therefore, we conducted an empirical experiment to utilize insulated multi-4-core tubes as electrical cables for ships. The durability and temperature changes of the cable were tested when DC current conditions of 10-25A were supplied in a stepwise manner to two cores of the multi-4-core tube and when cooling water was supplied at a level of around 15℃ and 13 l/min to the other two cores. At the minimum condition of 10A, the temperature of the core increased by 1.75℃, while at the maximum condition of 25A, it increased by 11.9℃, resulting in a temperature difference of approximately 10.15℃. However, the inlet-outlet temperature difference of the cooling water remained relatively uniform at approximately 0.7-1.0℃ under all conditions. This indicates that the established cooling water system operated with excessive flow rates. Thus, it was extrapolated that a higher cooling effect could be achieved if the heat exchange and residence time of the cores are maximized by appropriately reducing and adjusting the flow rate of the cooling water in the future.