To exhaust the ammonia gas released after the rupture of a low-pressure suction pipe of an ammonia refrigeration compressor

a computational fluid dynamics (CFD) method was used to numerically calculate the accident ventilation process and compare the emergency ventilation effectiveness under different airflow patterns in this study. According to the calculation results

the upper edge of the exhaust vent in the side wall has little effect on the removal of pollutants within the range of 0–0.2 m. When there are doors at both ends of the ammonia refrigeration plant

and there are upper and lower rows of windows in the middle

the volume of the area where the NH3 mass fraction exceeds 4.2 × 10-4 after 120 s of emergency ventilation is: 133.0% higher with all doors open

60.7% higher with all doors and windows open

98.1% lower with the upper row of windows open

and 180.3% higher with the lower row of windows open respectively than that with all open windows. The total indoor NH3 mass after 120 s of ventilation is 40.6% higher with all doors open

12.7% higher with all windows and doors open

24.1% lower when the upper row of windows are open

and 44.4% higher when the lower row of windows are opened than that with all windows open.