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철도차량용 공기압축기의 열교환기 최적 설계를 위한 해석 연구
김무선(Moo Sun Kim),정종덕(Jong Deok Chung),장성일(Seongil Jang),안준(Joon Ahn) 대한설비공학회 2017 설비공학 논문집 Vol.29 No.11
In this study, we examined the multi-stage piston-type air compressors typically used in a railroad vehicle, and the heat transfer efficiency was analyzed according to the design conditions of the heat exchanger (a compressor component module for cooling the compressed high temperature air). For the fin-tube heat exchanger used in the most air compressors, numerical analysis was performed to analyze heat transfer by defining the various rectangle tube sizes and the number of fin-per-unit area as design variables under the same flow rate of compressed air. Also, this analysis compared the temperature of the compressed air. Regarding environmental conditions for analysis, the flow rate of the external cooling air was measured and the mean value of the values was applied. And a “turbulence model” was considered in both the external flow of the cooling air and the internal flow inside the tube. From the results of analysis, it was found that the change of the aspect ratio value of the tube greatly influences the heat transfer efficiency of the compressed air, and influences if the fin density is relatively small. As a result, the optimum design specifications of the heat exchanger for air compressors were confirmed based on the analysis of the heat transfer efficiency, according to the design conditions of fin and tube by the operating temperature range of the compressed air.
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안태기(Ahn Tae Ki),신정렬(Shin Jeong Ryol),박기준(Park Kee Jun),정종덕(Chung Jong Deok) 한국철도학회 2006 한국철도학회 학술발표대회논문집 Vol.- No.-
Since the most part of maintenance work for EMU depends on the worker"s know-how, the quality of maintenance is different according to the worker"s skill and experience. Especially EMU is composed of the various parts such as electrics, electronics, communication, signal, and machinery, etc., and performs its function by their organic work. Therefore it is very difficult to improve the quality of maintenance for EMU. In this paper we purpose how to change the know-how-based maintenance method to knowledge-based maintenance method. Consequently we can ensure the quality of maintenance for EMU, and improve the quality by continuous maintaining the knowledge.
ScienceON
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