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Investigation of Bus Duct System for Optimum Cooling Performance
ISSN: 0148-7191, e-ISSN: 2688-3627
Published November 01, 1993 by SAE International in United States
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Uniform cooling inside a large bus in hot season is important for comfort of all the passengers. The air, which is cooled by the car cooling system, is distributed into the room space of the bus by a duct system, For some buses with a sub-engine cooling system, however, it is cold at front seats while there is little cooling at rear seats. In order to solve this problem, several factors such as equal distribution of cooling air at each nozzle, duct insulation, exchange rate of room air, heat generation of reading lamps, etc. may be studied. Among these factors, the most important one is equal distribution of the cooling air, since the cooling effect is mainly due to the cooling air stream. In this study, the duct system installed in a specific bus is treated by using a CFD code. The cooling air velocity at the foremost nozzle of the current system is 1.5-2 times that in the middle. This is improved to have almost equal velocity at each nozzle by modifying the duct shape and air flow resistance inside the system. The CFD results for air velocity at each nozzle before and after the improvement are compared with those by vehicle tests to verify the validity of the analysis.
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CitationKim, C. and Kim, J., "Investigation of Bus Duct System for Optimum Cooling Performance," SAE Technical Paper 931956, 1993, https://doi.org/10.4271/931956.
- Meong, H.K. 1992 “A Duct Study for Optimum Cooling Performance of Large Bus” '92 Kist-Industry consortium 9th report KOREA
- Hur, N.K. 1993 “Computational Analysis for Optimum Air Distribution of Air Condition Duct of Large Bus” '93 Kist-Industry consortium 10th report KOREA
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- Belaidi, A. Johnson, M.W. Humphrey, A.C. 1992 “Flow instability in a Curved Duct of Rectangular Cross Section” ASME Journal of Fluids Engineering 114 585
- Majundar, S. Rodi, W. Zhu, J. 1992 “Three Dimensional Finite-Volume Method for Imcompressible Flows with Complex Boundaries” ASME Journal of Fluids Engineering 113 496
- Yang, S.Y. 1989 “Turbulent Flow Analysis in the Symmetric Planes of the Strongly 90° Curved Ducts and the Strongly 90° Diffusing Curved Ducts by Finite Analytic Method” HANYANG Univ. KOREA