Redesign the air ventilation system in the engine room 48 meter patrol ship

Abstract The patrol boat with a Length Overall of 48 meters has the main function as a coastal patrol boat. The air ventilation system installed on patrol ships currently reaches an average temperature of 320°K ∼ 345°K with an average speed of 0 ∼ 2.5 m/s and the airflow is not distributed throughout the engine room. The temperature in the engine room is above the ISO 8861:1998 standard where the maximum temperature is 318.15 K (45°C). Based on calculations according to ISO 8861, the total air capacity requirement is 10.806 m 3 s −1 or 38.901 m 3 /hour, while the currently installed air blower capacity only has an air capacity of 3.988 m 3 s −1 or 14.358 m 3 h −1 . The existing air ventilation system consists of 2 air blowers that suck in outside air. Computing Fluid Dynamics (CFD) is used to calculate the temperature distribution of the engine room between the existing ventilation system and the ventilation system based on ISO 8861 calculations. Based on the CFD simulation results, a blower modification with a capacity of more than 10.806 m 3 s −1 is carried out so air can be distributed throughout the room at an average speed 2.5 ms −1 ∼ 8 ms −1 with engine temperature at a height of 1-2 meters is 303°K ∼ 315°K according to ISO 8861:1998 standards.