Study on integrated design of engine room ventilation

Initial design, working design, and manufacturing are three key steps for ship design and manufacturing. The system design of engine room ventilation is an important component of initial design for ships. However, in current design technology, after the working design, whether the air quantities delivered at the exits of the ventilation system meet with that of initial design is not checked. Nevertheless, differences may exist between the actually delivered air quantities and the results of the working design, and such differences remains unknown until the sea trial. To achieve integration and improve design effectiveness of the ventilation system design in these three steps, a three-dimensional (3D) model based ventilation design process and technology have been developed. The diameters of the 3D ventilation routes are determined by using New Duct program in the initial design step, and the Flow Rate program has been used to predict the air quantities to be delivered by the ventilation system modified in the detail design step. The differences in the measured air quantity delivery and the predicted air quantity delivery were compared in the engine room ventilation system of a 4622 TEU container ship.