밀폐 선실 공간의 공기질에 미치는 환기 영향 전산해석

Abstract

Ventilation system in cabins is essential for healthful environment of crew members; however it is very difficult to predict the ventilation performance before the system is finally built in. Even though there are several requirements for the ventilation system, such as limits for maximum concentration of CO2, arithmetic estimation of change rate based on the flow rate and the cabin volume is the only available tool for the prediction. Since the air flow depends heavily on the geometrical domain, assessments based on computational fluid dynamics can be very effective and an useful alternative. This paper presents computational study of air flow in a cabin using CFD for 3D Navier-Stokes equation and multi-species transport. Existing and ventilated air are considered as different species, and the transport of new air is solved. The results include predicted air change rate as well as CO2 distribution due to breath and skin temperature of crews in the cabin. Due to the lack of experimental data, the computed results are not verified; however, the proposed method can be applied as an assessment tool.