An optimization of comparative analysis to improve the effectiveness of EGR coolers used in diesel engine

Abstract

The EGR mechanism is the predominant method to reduce the emitted NOx
from diesel engine. The exhaust
system reduces the combustion temperature, because of this formation of NOx
is reduced. Commercial computational
fluid dynamics (CFD) is used to solve and simulate the flow-fields and temperature distribution of fluids inside the EGR
cooler. There are three models of EGR coolers have been developed using Pro/engineer software. Model-a is a single
pass shell and tube type heat exchanger with plain tubes having cylindrical shaped fixed head. Model-b is similar to the
model-a except tubes because in model-b plain tubes were replaced with circular internally finned tubes to increase the
surface area of tubes. In Model – c rectangular fins are used for analysis. In model-a, model-b and model - c the inlet
conditions of both fluids kept constant for the analysis of effectiveness and exhaust temperature. Both analytical result
and CFD result show that heat transfer between exhaust gas and coolant is increased for finned tubes. In three models
rectangular fin tube model is more effective compared to other two models because surface area for heat transfer is more
in rectangular fin tube model.