CFD investigation of ventilation strategies to remove contaminants from a hospital room

The primary requirement in designing air conditioning systems in healthcare facilities is
eliminating contaminants. It is considered one of the crucial health elements in building design,
particularly in the presence of many airborne diseases such as COVID-19. The purpose of this
numerical research is to simulate various ventilation designs for a hospital room model by taking into
account results obtained by previous researchers. Four designs with three airflows, 9, 12, and 15 ACH
(Air Change per Hour), are applied to explore the capacity of the ventilation system to remove contaminants.
The objective is to determine the influence of airflow and the diffuser location distribution
on the pollutants elimination represented by carbon dioxide. The Reynold Averaged Navier–Stokes
(RANS) equations and the k-" turbulence model were used as the underlying mathematical model
for the airflow. In addition, boundary conditions were extracted from ASHRAE (American Society
of Heating, Refrigeration, and Air-Conditioning Engineers Society) ventilation publications and
relevant literature. Contrary to what was expected, this study’s results demonstrated that increased
ventilation alone does not always improve air distribution or remove more contaminants. In addition,
pollutant removal was significantly affected by the outlet’s location.