Reducing the Excess Energy Consumption on Higher Ventilation Flowrates to Control the CO2 Levels of the Central Air Conditioning Systems in Polluted Urban Areas by CO2 Capturing

Controlling the air quality of the indoor environment is extremely important to improve the health and the productivity of the occupants. The air quality is maintained by providing ventilation air following the ASHRAE standards. The ventilation air (outdoor fresh air), usually processes in the Air Handling Unit (AHU) of the Central AC system, and delivers to the occupant zones. However, supplying outdoor air with increased levels of CO
2
will adversely affect for the health and the productivity of the occupants. In this study, it was found that the CO
2
levels in the indoor environments increase with the increased atmospheric CO
2
levels and the recirculation air percentage. When the CO
2
level of the outdoor air is higher, IAQ can only be controlled by supplying more fresh air to the indoor environment. However, it increases the load on the Cooling Coil and eventually, electricity consumption of the chiller increases. Moreover, the higher excess air flowrates of the MVAC systems require larger fans and increased equipment costs. Therefore, it has been suggested that a CO
2
Capturing Device which is suitable for MVAC systems can handle these extreme scenarios and reduce the operating and maintenance cost of the MVAC systems.