Method to assess quality and quantity of outdoor ventilation airflow received by occupants

摘要

Ventilation with outdoor air is one important way to improve indoor air quality and keep occupants healthy and comfortable. Assessment of ventilation performance and effective outdoor ventilation airflow received by occupants at their workspace or respiration zone is necessary. A new scale, the first factor of outdoor air effect (FFOAE), was developed for this purpose and is based on the relationship between local components composition and the combined effect of outdoor air stream and contamination sources. The transfer efficiency of the outdoor air component, the time efficiency of indoor airflow, and the transfer efficiency of the contaminant component were reflected simultaneously in the first factor of outdoor air effect. With the aid of the FFOAE, impacts of indoor airflow pattern, supplied outdoor airflow rate, contamination sources emission intensities, and their distribution on ventilation performance, quality, and quantity of outdoor ventilation airflow received by occupants are discussed by numerical simulations.