This paper describes the results of a DOE (design of experiment) applied to an exhaust heat exchanger to lower the exhaust gas temperature mainly under high load conditions. The heat exchanger was installed between the exhaust manifold and the inlet of the close-coupled catalytic converter (CCC) to avoid thermal aging. The DOE evaluates the influence of the selected eight design parameters of the heat exchanger geometry on the performance of the exhaust gas cooling system, and the interaction between these parameters. To maximize the heat transfer between exhaust gas and coolant, fins were implemented at the inner surface of the heat exchanger. The design parameters consist of the fin geometry (length, thickness, arrangement, number of fin), coolant direction, exchanger wall thickness, and the length of the heat exchanger. The acceptable range of each design parameter is discussed by analyzing the DOE results.The exhaust heat exchanger successfully decreased the exhaust gas temperature, which eliminated the requirement of fuel enrichment under high load conditions. However, the cooling of the exhaust gas through the heat exchanger may cause the deterioration of exhaust emissions at cold start due to the increment of catalyst light-off time. The light-off time was found to increase by 18 seconds in EC mode test. Hydrocarbon emission was also increased by 0.021g/km though it still meets the Euro-IV regulation. The fuel economy was improved by 7.64% at high speed conditions owing to no fuel enrichment.


    Access

    Check access

    Check availability in my library

    Order at Subito €


    Export, share and cite



    Title :

    Effect of Design Parameters on the Performance of Finned Exhaust Heat Exchanger


    Additional title:

    Sae Technical Papers


    Contributors:
    Bae, Choongsik (author) / Jeon, Jongik (author) / Lee, Seokhwan (author) / Han, Taesik (author)

    Conference:

    SAE Powertrain & Fluid Systems Conference & Exhibition ; 2003



    Publication date :

    2003-10-27




    Type of media :

    Conference paper


    Type of material :

    Print


    Language :

    English




    Effect of design parameters on the performance of finned exhaust heat exchanger

    Lee,S. / Bae,C. / Jeon,J. et al. | Automotive engineering | 2003


    Effect of Design Parameters on the Performance of Finned Exhaust Heat Exchanger

    Lee, S. / Bae, C. / Jeon, J. et al. | British Library Conference Proceedings | 2003


    Performance of NACA Type A finned-tube exhaust heat exchanger

    Reuter, J.G. / Manson, S.V. | Engineering Index Backfile | 1944



    Performance tests of NACA type A finned-tube exhaust heat exchanger

    Reuter, J. George / Manson, S. V. | TIBKAT | 1944