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평판관-루버핀 열교환기의 공기측 열전달 및 압력강하 특성에 관한 실험적 연구
강병하,김석현,장혁재,박병규 대한설비공학회 2002 설비공학 논문집 Vol.14 No.6
Heat transfer and pressure drop on the air side of a plate-louvered fin heat exchanger with new shape of louver fin have been investigated experimentally. Water is employed inside the flat tube to transfer heat with air for convenience. This problem is of particular interest in the design of a plate-louvered heat exchanger. The effect of air flow rate, water flow rate and water temperature on pressure drop as well as heat transfer in air side are studied in detail. The present results showed a good agreement qualitatively with the previous results in general. Based on the experimental data, f-factor and j -factor correlations of the present louvered-fin are suggested. It is also found that heat transfer could be enhanced with new shape of louver fin, compared with the conventional louvered-fin, while the f-factor remains unchanged.
A Review of Recent Research on Automotive HVAC Systems for EVs
강병하,이현진 대한설비공학회 2017 International Journal of Air-Conditioning and Refr Vol.25 No.4
Automotive heating, ventilation, and air-conditioning (HVAC) systems are of particular interest from the viewpoint of improving fuel economy, especially in electric vehicles (EVs) such as hybrid electric vehicles (HEVs), fuel cell electric vehicles (FCEVs), and battery electric vehicles (BEVs). This paper describes recent research on automotive air-conditioning and heating technologies after classifying them into heat pump applications, control and operation, heat exchangers, refrigerants, thermal comfort, localized HVAC systems, and additional energy-saving systems. Even though many researchers have applied the existing concepts and technologies for EVs, significant revamping efforts are necessary owing to the dynamic, transient, and local characteristics of vehicles.
적외선 센서용 극저온 용기의 냉각특성에 관한 실험적 연구
강병하,이정훈,김호영 대한설비공학회 2004 설비공학 논문집 Vol.16 No.10
Infrared (IR) detectors are widely used for many applications, such as temperature measurement, intruder and fire detection, robotics and industrial equipment, thermoelstic stress analysis, medical diagnostics, and chemical analysis. Quantum detectors commonly need to be refrigerated below 80 K, and thus a cooling system should be equipped together with the detector system. The cooling load, which should be removed by the cooling system to maintain the nominal operating temperature of the detector, critically depends on the insulation efficiency of the cryochamber housing the detector. Thermal analysis of cryochamber includes the conduction heat transfer through a cold well, the gases conduction and gas outgassing, as well as radiation heat transfer. The transient cooling characteristics of an infrared detector cryochamber are investigated experimentally in the present study. The transient cooling load increases as the gas pressure is increased. Gas pressure becomes significant as the cooling process proceeds. Cool down time is also increased as the gas pressure is increased. It is also found that natural convection effects on cool down time become significant when the gas pressure is increased.