Local ventilation for airborne cross-infection control in spaces : ph. d. thesis
Mazej, Mitja
The current Ph.D.Thesis focuses in the development and optimisation of a novel local ventilation method, designed to control and reduce the risk of airborne cross-infection in occupied spaces. In ...this thesis the dispersion of pathogen-laden droplets between the two occupants, sitting opposite to each other, in a room with mixing background ventilation is analyzed with and without the use of the novel advanced local ventilation method, based on the air curtain principle. In the first part of the thesis the efficiency of the air curtain system for decreasing the risk of cross-infection is demonstrated and the importance of different factors (background ventilation, air change rate, design and geometrical characteristics of the air terminal device for generating air curtain, supply flow rate etc.) is identified and recommendations for the design are outlined based on the experimental analysis. In the second part protection potential of the air curtain against direct shortterm exposure to a wide range of possible cough levels is proved on the basis of performed experimental and numerical investigations. The resulting total exposure against experimentally studied strong cough was reduced by as much as 87% relative to the reference exposure without the local ventilation protection, while full protection against average strength coughs was obtained, which is very promising considering the simplicity of the method. This is an important finding as it is proved that increase of ventilation rate of the mixing air distribution alone is not able to provide any protection and is not efficient strategy to control the risk of cross-infection due to coughing.
Type of material - dissertation
; adult, serious
Publication and manufacture - Ljubljana : [M. Mazej], 2011
Dr MAZEJ M. Local IN: 00057042
Dr MAZEJ M. Local IN: 00057042
available - reading room
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