Present standards define maximum CO2
concentration level in the air inhaled by occupants. The amount of outdoor air supplied
to the room is controlled to keep the CO2 concentration equal or slightly below
the allowed maximum CO2 level. The indoor CO2 concentration is often measured
in only one location in the room - either in the exhaust room air or at one of
the walls. However, measurements in only one point does not correctly represent
the actual CO2 concentration in the entire occupied zone including in the
inhaled air of the occupants. The project will investigate the effect of occupant
density (i.e. heat load), distance between the occupants, location of the
exhaust diffuser and supply airflow rate on CO2 concentration in the inhaled
air and the CO2 concentration measured at the exhaust, walls or above occupants.
For this purpose, experiments with human subjects and a thermal breathing
manikin will be conducted in a room with mechanical ventilation. The results from this project will be used to
improve the methodology for CO2 based design of building ventilation. This project is planned to start 1 August 2019 till 31 December 2019.
Knowledge of HVAC design