• 5. Tagung Wärmemanagement | Haus der Technik, Berlin 2016
    Thermodynamischer Vergleich zwischen einer Hochdruck- und einer Niederdruck-Abgasrückführung
    K. Tüber, W. Ambros, Modine Europe GmbH
  • As world-wide exhaust legislation for diesel powered vehicles becomes more and more rigorous, extensive measures inside and outside the engine are necessary. This includes a cooled exhaust gas recirculation (EGR), which makes possible substantial reduction of nitrogen oxide emissions. Thereby, the EGR process can be implemented in a conventional high pressure EGR loop or in a low pressure EGR loop. In the latter case, part of the exhaust gas is extracted after the turbine and the diesel particulate filter to be recirculated and mixed with fresh air before the compressor. The present contribution describes the fundamental advantages and disadvantages of these two EGR systems and supplies a simulation model for a vehicle, which was generated using KULI®, a one-dimensional simulation software package. This model permits the computation of the charge air inlet temperature to the engine and the thermodynamic effects on the involved heat exchangers (EGR cooler, Charge air cooler and Radiator). It shows that in case of unchanged components a substantial thermal advantage for the low pressure EGR loop can result. For the boundary conditions of the selected basis case the engine intake air temperature could be reduced around 5.1K without penalizing the coolant side. An additional parametric study examines the influence of fresh air mass flow, air compression ratio, exhaust gas temperature, EGR rate and coolant rate in the EGR cooler.

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