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Development of an evaporative cooling system for small four-stroke engines

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Abstract

A new evaporative cooling system for small four-stroke engines has been developed. Performance tests of a four-stoke single cylinder engine equipped with this evaporative cooling system have been carried out in the laboratory. Air removal rates from the closed coolant loop during the starting stage of the engine have been monitored for various engine operating conditions. In addition, data of the brake horsepower, the specific fuel consumption, heat loss to the coolant, cylinder-liner wall temperature and the wall heat flux have been obtained and were compared to those of the identical engine equipped with a conventional liquid cooling system. At a fixed air fuel ratio and under the MBT condition, the brake horsepower of the engine for the evaporative cooling system is enhanced compared to that for the liquid cooling system. The heat loss through the cylinder liner is decreased when the evaporative cooling system is adopted. The test result indicates several benefits of the evaporative cooling system such as faster warm up, better fuel economy and greater engine durability.

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Authors and Affiliations

  1. Mechanical Engineering Department, Yeungnam University, 713-748, Gyongsan, Korea

    S. C. Lee & J. Y. Kim

  2. Department of Automobile, Yeungnam Junior College of Technology, 705-037, Taegu, Korea

    B. H. Han

  3. Dae Woo HMS Industries Co, 711-855, Daisung, Korea

    T. M. Choi & S. H. Bae

Authors
  1. S. C. Lee
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  2. J. Y. Kim
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  3. B. H. Han
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  4. T. M. Choi
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  5. S. H. Bae
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Lee, S.C., Kim, J.Y., Han, B.H. et al. Development of an evaporative cooling system for small four-stroke engines. KSME Journal 4, 150–155 (1990). https://doi.org/10.1007/BF02954037

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  • DOI: https://doi.org/10.1007/BF02954037

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