SPACE AND TANK WINTERIZATION TECHNIQUES FOR VESSELS OPERATING IN COLD REGIONS

摘要

To meet the increasing demands for vessels operating in cold regions, SHI (Samsung Heavy Industries) has contributed to the design and the construction of these vessels. In comparison with other ships, the main differences can be considered as winterization for outfitting systems to guarantee safe operation in cold environments. In this study, a simplified evaluation technique has been introduced for thermal protection, based on the derivation of an overall heat transfer coefficients including suitable convection terms. It has been applied to evaluate the thermal protection performance in ballast tank and air-pressurized-vessel room and proved to be reasonable performance within 10%, comparing with the results by CFD (Computational Fluid Dynamics) using commercial code, FLUENT. Since CFD technology has been widely used in various fields, anti-freezing mechanisms in ballast tank with an air bubbling system has been simulated to check the performance under -20°Cof ambient temperature. An imaginary variable coefficient of specific heat value was introduced to consider latent heat at the range of freezing point temperature. The simulation gives physically reasonable phenomena and confirms the applicability of air-bubbling system as an anti-freezing system for ballast tank.