This study investigates the characteristics of human exhalation through the mouth with three different ventilation strategies: displacement ventilation, mixing ventilation and without ventilation. Experiments were conducted with one breathing thermal manikin in a full scale test room where the exhalation airflow was analyzed. In order to simulate the gaseous exhaled substances in human breathing, N2O was used as a tracer gas. The concentration of N2O and the velocity of the exhaled flow were measured in the center line of the exhalation flow. The velocity decay of the exhalation flow versus distance was analyzed for the three ventilation strategies. The relationship between gas concentration values and distance from the manikin was also examined. The measurements show distribution system. Two equations could be applied to describe the relationship between distance from the manikin and, respectively, peak velocity values and maximum mean gas-concentration values.
|Title of host publication||ASHRAE’S IAQ 2010 : airborne infection control- ventilation, IAO & energy|
|Number of pages||12|
|Place of Publication||Kuala Lumpur|
|Publisher||American Society of Heating, Refrigerating and Air-Conditioning Engineers, Inc.|
|Publication status||Published - 2010|
|Event||ASHRAE IAQ Conference 2010 - Kuala Lumpur, Malaysia|
Duration: 10 Nov 2010 → 12 Nov 2010
|Conference||ASHRAE IAQ Conference 2010|
|Period||10/11/2010 → 12/11/2010|
Bibliographical notePublished on a CD.
- Exhalation Flow
- Human Breathing
- Velocity Decay
- Thermal Manikin