| Title |
Heat Transfer Analysis of a Heat Exchanger for an Air-Compressor of a Railway Vehicle Based on Cooling Air Flow Measurement |
| Authors |
Joon Ahn ; Moo Sun Kim ; Seongil Jang |
| DOI |
https://doi.org/10.6110/KJACR.2017.29.9.447 |
| Keywords |
열교환기 ; 열전달 ; 철도차량 Heat exchanger ; Heat transfer ; Railway vehicl |
| Abstract |
In this study, local velocity distribution of cooling air in a heat exchanger used in an air compressor for a railway car was measured and heat transfer characteristics of the heat exchanger were analyzed. First, heat transfer coefficient and fin performance of the cooling air side were predicted and was checked if the fin of the heat exchanger was effectively used. Distribution of air flow rate at high temperature side was predicted through pipe network analysis and heat resistance at high temperature and low temperature side were predicted and compared. Spatial distribution of temperature in the interior and surface of the square channel constituting high-temperature side was predicted and appropriateness of the size of the heat exchanger was examined. As a result of the analysis, the present size of the heat exchanger could be reduced and it could be effective to promote heat transfer inside the heat exchanger rather than outside to improve performance of the heat exchanger. |