The infectious isolation intensive care unit (ICU) is an isolation unit where medical care is provided for patients with severe infectious diseases

which plays an important role in epidemic prevention and control. In this study

the application of a fresh air system combined with a radiant ceiling in an infectious isolation ICU was simulated using computational fluid dynamics models. The effects of different heating or cooling capacities of the radiant ceiling and heights of exhaust outlet on the indoor thermal environment and contaminant removal efficiency were examined. Experiments were also conducted to verify the accuracy of the model. The vertical temperature difference in the room

draft rate near the patients

and contaminant removal efficiency decreased by 5%–58%

68%–86%

and 13%–50%

respectively

with the increase in the cooling capacity of the radiant ceiling in the summer. The exhaust outlet installed on the upper part of the room discharged gaseous pollutants and heat during the summer. In winter

the use of the radiant ceiling combined with the exhaust outlet reduced the room vertical temperature difference by 7%–43% and improved the contaminant removal efficiency by 43%–59%. However

the combined use of the radiant ceiling and exhaust outlet in the lower part of the room in the winter reduced the contaminant removal efficiency. These results are applicable to the operation of fresh air systems combined with a radiant ceiling in infectious isolation ICUs.