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바이패스 오리피스 팽창장치의 유동 특성에 관한 실험적 연구
최종민,김용찬,Choi, J.M.,Kim, Y.C. 대한설비공학회 1999 설비공학 논문집 Vol.11 No.1
To establish optimum cycle of the inverter-driven heat pump with a variation of frequency, the bypass orifice, which is a short tube having a bypass hole in the middle, was designed and tested. Flow characteristics of the bypass orifice were measured as a function of orifice geometry and operating conditions. Flow trends with respect to frequency were compared with those of short tube orifices and capillary tubes. Generally, the bypass orifice showed the best flow trends among them, that will enhance the seasonal energy efficiency ratio of an inverter heat pump system. Based on experimental data, the semi-empirical flow model was developed to predict mass flow rate through bypass orifices. The maximum difference between measured data and model's prediction was within ${\pm}5%$.
바이패스 타입 self-switchable 엔진마운트 개발
김승원(Seungwon Kim),심현진(Huounjin Sim),이병곤(Byeonggon Lee) 한국자동차공학회 2021 한국자동차공학회 부문종합 학술대회 Vol.2021 No.6
In high-end vehicles, electronic control mounts are often applied to simultaneously improve idle vibration and ride-shake. However, the electronic control mount must apply a controller, solenoid valve, wiring, etc. Cost, weight, layout, etc. are disadvantageous when compared to a general hydro mount. Therefore, it cannot be applied to many models. Therefore, in this paper, a self-switchable mount was developed and proposed. Self-switchable mounts have eliminated controllers, solenoid valves and wiring. The method of changing the stiffness is the amplitude of the vibration input to the mount. In this paper, design principles, cost, and weight savings will be mentioned, and the test results in vehicles will be presented.
안병훈(Byounghoon An),이원석(Wonsuk Lee),이순종(Soonjong Lee),박병덕(Byung-Duck Park),박만희(Manhee Park),최용현(Yonghyun Choi) 한국자동차공학회 2013 한국자동차공학회 학술대회 및 전시회 Vol.2013 No.11
For the prevention of depletion of energy resources and global warming in the world, efficient use of energy is required. By a global movement like this, the most important issue in the automobile field is improved fuel efficiency in recent. In order to improve the fuel efficiency of automobiles, improving performance of air conditioning system is the most important. In this study, it has been the design of the sub-expansion system has enough sub-cooling is obtained in the condenser outlet. In this system, the triple tube heat exchanger and the refrigerant expansion circuit is installed in the condenser outlet for performing heat exchange even more. The experimental results, sub-expansion system confirmed cooling performance to be better than 8% of the existing system.