CFD를 이용한 병실 국부지역의 공기전파감염확률 평가사례

Abstract

The purpose of this paper is to suggest the evaluation method for airborne infection risk at specific location in an area. The suggested method integrates the computational fluid dynamics(CFD) simulation and Wells-Riley equation. CFD simulation is used to derive the airborne pathogen concentration in a specific location by using passive scalar model. Wells-Riley equation is based on the airborne pathogen concentration at well-mixed room air and stead state. Suggested method substituted the airborne concentration of well-mixed condition to of spatial airborne pathogen concentration. The airborne pathogen was considered as passive scalar instead of particle matter contrary to the previous studies. The case study is performed to availability of the suggested evaluation method. The suggested method showed inhomogeneous expected airborne infection risk according to the elapsed time at a specific location. In order to implement this method to establishment of hospital design guideline, determination of airborne pathogen intensity and elapsed time of patient occupancy is required. In addition, the suggested method has limitation that the infection risk around pathogen source can be under-estimated in real situation because the airborne pathogen(droplet nuclei smaller than 1㎛) regarded as passive scalar does not act like droplet larger than 5㎛.