|Tracer gas technique for ventilation rate characterization
|Ventilation -- Measurement.
Hong Kong Polytechnic University -- Dissertations
|Department of Building Services Engineering
|ii, 45 pages : color illustrations
|Ventilation rate not only influence office work performance, it is special important for occupier's physical health. This project researched states of doors and windows how influence the ventilation rate. Using dual tracer gas of CO2 and SF6 measured indoor concentrations. The SF6 selected as the material of constant concentration and calculated the mass fraction; otherwise, CO2 tested the air change rate by the method of concentration decay. The UVW Anemometers be selected to collected wind speed from top of the building (outdoor) and the corridor separately. The on-site measurement select two modes, close mode which is all doors and windows are closed and open mode is closed all doors but indoors shutters kept 45degree opened. In close mode, roof wind has a little influenced on indoor concentration, corridor wind have effect on concentration and mass fraction. In open mode, roof wind and corridor wind both have a significantly effect on air transmission. Linear regression calculate the air change rate (ACH), however, the relationship of ACH and air born is not clear. In the end, this paper propose some advices to improve the measurements.
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