Evaluating the IAQ and energy performance of two types of ventilation systems in multifamily buildings

This study evaluates the performance of Single-Flow and Dual-Flow ventilation systems in a residential building situated in Strasbourg, characterized by high PM2.5 levels, permeable tightness, and strong wind conditions. The research examines indoor air quality by measuring CO2 and PM2.5 concentrations in bedrooms and compares the energy consumption of both systems across different cities. The findings indicate that the Dual-Flow system effectively maintains CO2 levels between 500 and 1000 ppm, significantly reduces peak PM2.5 levels, and demonstrates superior energy efficiency, particularly with heat recovery system Conversely, the Single-Flow system shows limitations in controlling indoor air quality and higher energy consumption. Overall, the Dual-Flow ventilation system proves to be a more effective solution for enhancing indoor air quality and achieving energy savings in residential buildings under similar environmental conditions.