The Effect of Hot and Cold EGR Applications on Exhaust Emissions in Diesel Engines
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Keywords:
EGR, NOx, Smoke, HC, CO EmissionsAbstract
In this study, the effects of hot and cold Exhaust Gas Recirculation (EGR) applications on
exhaust emissions in diesel engines were experimentally investigated. Tests were conducted by applying
both hot and cold EGR at 10% and 20% rates, and the resulting emission values were compared with
standard operating conditions. The results revealed that both types of EGR significantly reduced NOx
emissions. However, as the EGR rate increased, notable increases were observed in HC, CO, and smoke
emissions. These increases are attributed to the reduction in oxygen concentration and combustion
temperature in the combustion chamber caused by EGR, which negatively affects combustion efficiency.
In particular, the further decrease in combustion temperature with cold EGR applications exacerbated
these negative effects. In conclusion, although EGR applications are effective in controlling NOx
emissions, they must be carefully optimized due to their adverse impact on other harmful emissions. The
findings suggest that to balance engine emissions effectively, EGR rate, application type (hot/cold), and
engine operating parameters must be evaluated together.
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