Analysis of indoor occupant contaminants under the isothermal dual-airflow window ventilation

This paper discussed the isothermal ventilation effect of dual airflow windows in the rooms with different structures by combining computational fluid dynamics (CFD) simulations with physical experiment which supplied the boundary conditions and the accuracy verification for CFD model. Carbon dioxide breathed out by people was regarded as the representative pollutants in the paper. The results show that CFD model is validated excellently by the physical experiments. In all the four rooms, the simulations indicate that all the average CO₂ concentrations are around 860 ppm, and the value is smaller than the national standard requirement, 1000 ppm Therefore, in the rooms with the common depth modulus, dual-airflow windows can improve IAQ effectively, and the depth of the room has minimal impact on the average CO₂ concentration of the whole room However, as the depth increases from 3.0 m to 4.8 m, the average CO₂ concentration reduces on the horizontal planes where the emission sources located. Thus, the increasing depth can contribute to dilute CO₂ around the emission sources.