A master thesis from Aalborg University
Microenvironment around People
[mikromiljø omkring mennesker]
Author(s)
Term
4. term
Publication year
2010
Submitted on
2010-06-15
Pages
90 pages
Abstract
Nowadays, a lot of attention is drawn to the subject of airborne diseases. Various measures can be taken in order to prevent the cross infection between people in closed spaces. One of them can be choosing an air distribution system that could work as a way to remove contaminants exhaled by one person before they can affect other people in the room. Most common distribution systems are: mixing and displacement ventilation. This report focuses on characterizing the cross infection in a room with air distributed by diffuse ceiling inlet what creates fully mixed conditions in the room. Several experiments are carried out to evaluate how this ventilation system works in regards of cross infection. First part of measurements covers experiments with one thermal manikin. The exhalation jet is examined in order to provide a thorough description of its behavior and to create a mathematical description of velocity and concentration distribution in it. Second part covers measurements with use of two manikins. It is checked how one exhaling manikin can influence another one in terms of personal exposure. CFD simulation are also carried out as a way to supplement the results and serve as a comparison for experiments. By all these measures the subject of cross infection in a mixing ventilated room can be fully described. Moreover, results are compared with previous research that focused on another air distribution system: displacement ventilation. This comparison can lead to conclusions on which system should be used in spaces where there is a need to diminish the effect of cross infection.
Keywords
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