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

Lee, Seok-Hwan; Bae, Choongsik; Jeon, Jong-Ik; Han, Taesik

doi:10.4271/2003-01-3076

Cited by 3 publications

(2 citation statements)

References 19 publications

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“…To apply the DOE technique on the heat exchanger using the Taguchi method [8,15], signal, noise and control factors had to be identified. These factors are represented by the P-diagram shown in Fig.…”

Section: Design Of Experiments (Doe)-optimization Process Of Designinmentioning

confidence: 99%

“…In addition, it provided an alternative way to reduce the exhaust gas temperature at a higher engine load without wasting fuel. However, care must be taken such that there is not an increase in the engine back-pressure and the catalyst light-off time [8]. The DOE (design of experiments) approach was applied to limit the number of experiments needed to define the effects of the geometric design parameters (i.e., fin length, thickness, arrangement, and number of fins) [9].…”

Section: Introductionmentioning

confidence: 99%

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Design of a heat exchanger to reduce the exhaust temperature in a spark-ignition engine

Lee

Bae

2008

International Journal of Thermal Sciences

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Section: Design Of Experiments (Doe)-optimization Process Of Designinmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Design of a heat exchanger to reduce the exhaust temperature in a spark-ignition engine

Lee

Bae

2008

International Journal of Thermal Sciences

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Reducing the emissions and fuel consumption of a spark ignition engine by utilizing heat exchangers in the exhaust gas stream

Eftekhar

Keshavarz

2011

Proceedings of the Institution of Mechanical Engineers, Part D:

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In this study, an analytical technique has been used to design four types of heat exchanger in a spark ignition engine in an attempt to reduce both the warm-up period and the exhaust gas temperature under high-load conditions. The heat exchangers are installed in two different positions. One is installed after the outlet of the close-coupled catalytic converter to reduce the warm-up period, using the exhaust gas energy, and the other is installed between the exhaust manifold and the inlet of the close-coupled catalytic converter to avoid thermal ageing. To increase the heat transfer between the exhaust gas and the engine coolant, internally finned tubes have been selected. The first and second laws of thermodynamics are applied to optimize the number of fins and their geometry (i.e. the height and the thickness). Finally, the impact of heat exchangers on the warm-up period and the catalyst inlet temperature at high loads are presented. The results indicate that both the warm-up period and the exhaust gas temperature are decreased when the heat exchangers are installed along the exhaust gas stream. The results also show that a heat exchanger in the exhaust gas stream has the potential to reduce the requirement for high-load component-protection fuelling which, in turn, results in reduced fuel consumption and emissions.

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The application of an exhaust heat exchanger to protect the catalyst and improve the fuel economy in a spark-ignition engine

Lee

Bae

2007

Proceedings of the Institution of Mechanical Engineers, Part D:

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A close-coupled catalyst (CCC) can reduce engine cold-start emissions by utilizing the energy in the exhaust gas. However, in case the engine is operated at high engine speed and load condition, the catalytic converter may be damaged and eventually deactivated by thermal ageing. Excess fuel is sometimes supplied intentionally to lower the exhaust gas temperature, avoiding thermal ageing. This sacrifices fuel economy and exhaust emissions.This paper describes the results of 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 CCC to avoid thermal ageing. The exhaust heat exchanger successfully decreased the exhaust gas temperature, which eliminated the requirement of fuel enrichment under high-load conditions. A reduction of fuel consumption by approximately 7.7 per cent at high vehicle speed was achieved due to no fuel enrichment. Although the amount of hydrocarbon during the cold start increases due to the increment of the catalyst light-off time, it still meets the EURO-IV regulations. This problem could be resolved by adopting the solenoid valve to cut off the coolant at the inlet of the coolant passage of the heat exchanger.

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

Cited by 3 publications

References 19 publications

Design of a heat exchanger to reduce the exhaust temperature in a spark-ignition engine

Design of a heat exchanger to reduce the exhaust temperature in a spark-ignition engine

Reducing the emissions and fuel consumption of a spark ignition engine by utilizing heat exchangers in the exhaust gas stream

The application of an exhaust heat exchanger to protect the catalyst and improve the fuel economy in a spark-ignition engine

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