Enhancement of carbon monoxide removal in an underground car park using ventilation system with single and twin jet fans

This study aims to explore many case scenarios of both single and twin jet fans installation in existing ventilation system such as the operation mode, tilt angle and gap distance of the jet fans on the ventilation efficiency in an underground car park using computational fluid dynamics technique. It was found that the averaged carbon monoxide concentration was 28 ppm after the simulation time of 15 min for conventional ventilation case without jet fans. The inclined single jet fan had lower carbon monoxide concentration than conventional ventilation case. It was found that the straight twin jet fan could remove carbon monoxide gas better than the inclined one. The increasing gap distance increased the carbon monoxide ventilation efficiency of the system. In addition, the energy consumption was analyzed. The inclined single jet fan was potential jet fan installation when considering on both the ventilation efficiency and energy utilization aspects.