Increasing which of the following variables will require an increase in the outdoor airflow rate under Indoor Environmental Quality Prerequisite…

The outdoor airflow rate is the amount of outdoor air that is supplied to the building by the

ventilation system to dilute indoor air pollutants and provide fresh air for the occupants. The outdoor

airflow rate depends on the ventilation standard that the project follows, which can be either

ASHRAE 62.1-2010 or CEN Standard EN 15251-20071. Both standards specify the minimum outdoor

airflow rate per person and per unit area for different occupancy types and zones. Therefore,

increasing the number of occupants will require an increase in the outdoor airflow rate to maintain

the minimum ventilation level. The other variables, such as supply air velocity, system ventilation

efficiency, and supply air temperature set point, do not directly affect the outdoor airflow rate,

although they may influence the energy consumption and thermal comfort of the ventilation system.

Reference:

LEED Reference Guide for Building Design and Construction v4

Minimum Indoor Air Quality Performance

Ventilation for Acceptable Indoor Air Quality - ASHRAE

Indoor environmental input parameters for design and assessment of … - CEN