Please use this identifier to cite or link to this item: https://scholarbank.nus.edu.sg/handle/10635/220532
Title: ESTIMATION OF AIRBORNE INFECTIOUS DISEASE TRANSMISSION RISK USING DOSE � RESPONSE APPROACH IN A ROOM WITH DIFFERENT VENTILATION SYSTEMS
Authors: ANG SHU MENG
Keywords: Building
Project and Facilities Management
Tham Kwok Wai
2009/2010 PFM
Probability of infected risk
Ventilation systems
Issue Date: 2-Jun-2010
Citation: ANG SHU MENG (2010-06-02T03:14:51Z). ESTIMATION OF AIRBORNE INFECTIOUS DISEASE TRANSMISSION RISK USING DOSE � RESPONSE APPROACH IN A ROOM WITH DIFFERENT VENTILATION SYSTEMS. ScholarBank@NUS Repository.
Abstract: This study analyses the probability of infected risk at a radius distance of 1, 2, 3, and 4 m from an infected source using mixing, displacement, under-floor, and personalized ventilation systems each at 6 and 12 ACH-1. Results stated that with exception for personalized ventilation system at 12 ACH-1, infected risk does not decrease as the distance from infected source increases. Instead it increases when distance between infector and susceptible occupant is increased from 1 m to 2 m. Among the total volume ventilation systems, mixing ventilation at 12 ACH-1 has the lowest probability of infected risk for all the distances examined. Personalized ventilation system works the best in reducing infected risk among other ventilation systems for all ACH-1 examined. Results demonstrated that the probability of infected risk for tuberculosis is always higher than that of influenza due to three causing factors - infectious dose, deposition fraction, and pathogen concentration. To obtain the probability of the infected risk under perfectly mixed assumption, the mass balance equation for unsteady state was used with three assumptions - perfectly mixed environment, constant release of cough droplets into the indoor environment and uniform expiratory droplets sizes, and exposure risk equation are needed. The reproductive number of the perfectly mixed environment at 12 ACH-1 is lower than 6ACH-1 as infectious droplets could only remain in the room for a short period of time. Imperfect ratio which assesses perfectly mixed calculation shows that perfectly mixed calculation underestimates the actual value of an imperfectly mixed calculation regardless of the ventilation systems used.
URI: https://scholarbank.nus.edu.sg/handle/10635/220532
Appears in Collections:Bachelor's Theses

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