Revised air-exchange efficiency considering occupant distribution in ventilated rooms

Area of Science:

• Building science
• Environmental engineering
• Indoor air quality management

Background:

• Air-exchange efficiency is a standard metric for assessing ventilation effectiveness and indoor air quality.
• Current methods are limited as they do not account for occupant distribution within a space.
• Accurate ventilation assessment is crucial for maintaining healthy indoor environments.

Purpose of the Study:

• To develop a revised air-exchange efficiency metric that incorporates occupant distribution.
• To introduce occupant air-exchange efficiency for a more nuanced evaluation of ventilation.
• To address the limitations of traditional air-exchange efficiency in diverse room scenarios.

Main Methods:

• Development of a novel occupant air-exchange efficiency calculation.
• Application and testing of the revised metric across different ventilation strategies.
• Comparative analysis of occupant air-exchange efficiency versus traditional metrics.

Main Results:

• The occupant air-exchange efficiency metric was successfully developed and applied.
• Studies included large-space, personalized, and displacement ventilation cases.
• The revised metric demonstrated superior performance in evaluating ventilation effects.

Conclusions:

• Occupant air-exchange efficiency provides a more accurate assessment of ventilation performance.
• This revised metric is valuable for optimizing indoor air quality in various ventilated spaces.
• The findings support the adoption of occupant-aware ventilation evaluation methods.