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임효준(Hyo Joon Lim),이주경(Ju Kyoung Lee),황준현(Jun Hyeon Hwang),이경창(Kyung Chang Lee),이석(Suk Lee) Korean Society for Precision Engineering 2016 한국정밀공학회지 Vol.33 No.6
Unlike household refrigerators, commercial refrigerators are composed of separate indoor and outdoor units. The outdoor unit of most commercial refrigerators is designed to run at a fixed speed, which results in low energy efficiency and loud fan noise. Moreover, it cannot respond flexibly to changing thermal load in the indoor unit. Inverter type outdoor units can address such problems through speed changes based on information obtained from the indoor unit. However, using two units from different manufacturers is often not a viable solution. If condition changes in the indoor unit can be detected without communication between the two units, it is possible to adjust the speed of the outdoor unit. This paper attempts to analyze the signal from the outdoor unit when the condition of the indoor unit changes by varying the thermal load.
정헌술(Heon-sul Jeong),남지우(Ji-woo Nam),임효준(Hyo-joon Lim),정승욱(Seung-wook Jung),한성민(Sung-min Han) 유공압건설기계학회 2010 유공압건설기계학회 학술대회논문집 Vol.2010 No.6
Because of the increasing demand on the high precision and high response of a machinery, electronic control valves are widely adopted at various application fields. This paper studies on the static characteristic of a first-stage proportional pressure control valve. At first an experimental apparatus including hyd. pump variable speed inverter, pressure and data aquisition system was setted up with the experimental apparatus, various tests such as P-Q-W test, hyd, pump, dynamic, static, frequency response test of the proportional valve was carride out and the results are discussed.