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마이크로채널에서 FC-72의 단상 압력강하 및 열전달 특성에 관한 실험적 연구
장용희(Yonghee Jang),김보성(Bosung Kim),김용찬(Yongchan Kim) 대한설비공학회 2006 대한설비공학회 학술발표대회논문집 Vol.2006 No.11
Although the advance in electronic technology enables large number of circuitry to be packed in small volume, it is simultaneously needed to remove the high heat load produced by them. Since the use of a finned heat sink to these electronic components is limited by manufacturing constraints and noise levels, the use of liquid cooling is a promising way of maintaining low surface temperature by dissipating the large heat flux. In this study, the heat transfer and pressure drop characteristics of a micro-channel heat exchanger, which was designed for liquid cooling of electronic components, were investigated with various operating conditions. FC-72 was used as a working fluid. The micro-channel heat exchanger was made with rectangular shape that had hydraulic diameters of 61.1 and 137.5 ㎛ in regular intervals with a channel length of 310 ㎜. A direct heating method by DC power supply, which was used to apply heat load to the test section was adapted in this experiment. The heat flux provided by direct heating method ranged from 2.3 to 27.2 ㎾/㎡. The heat transfer rate from the heat source to the working fluid was measured, and pressure drop characteristics of the test section were also investigated for single-phase flow.
전기장 자극에 따른 Tetrahymena pyriformis의 움직임에 관한 연구
장용희(Yonghee Jang),김지훈(Jihoon Kim),변도영(Doyoung Byun),남성원(Seong-Won Nam),박성수(Sungsu Park),김민준(Minjun Kim) 한국가시화정보학회 2010 한국가시화정보학회 학술발표대회 논문집 Vol.2010 No.11
Recently, cell manipulation has been paid much attention to be applied to micro-robot. In this paper, we visualize the flow field induced by swimming T.pyriformis using micro-PIV system and investigate effect of electric field strength in terms of galvanotaxis. By using DC/AC voltage between two electrodes, T.pyriformis motion could be controlled, guiding to any specific direction. T.pyriformis stopping and rotating motion depends on frequency value in AC voltage. By means of implementing group swimming, we could suggest the biological pump or micro-structure transporter in microfluidic device.
안지훈(Jihoon Ahn),장용희(Yonghee Jang),김용찬(Yongchan Kim),장의영(Uiyoung Jang),박용종(Yongjong Park) 대한설비공학회 2008 대한설비공학회 학술발표대회논문집 Vol.2008 No.2
Various types of refrigerators become popular in the market such as a common refrigerator, kimchi refrigerator and wine cellar. It is required to develop a multi function refrigerator which has different purposes in each evaporator. In this study, the performance of a multi type refrigerator system, which consists of one machine room and three evaporators, was measured in a bench type multi refrigerator. The multi type refrigerator system was tested by varying the number of refrigerator cabinet, refrigerant charge amount, temperature condition. Based on experimental data, the multi type refrigerator showed better performance than the conventional refrigerator(single type) At the same external load condition, the COP of the multi type refrigerator was 1.22~1.29, but the COP of the single type refrigerator was 1.0.
R600a를 이용한 소형 멀티형 냉장고 시스템의 성능특성에 대한 실험적 연구
안지훈(Jihoon Ahn),장용희(Yonghee Jang),김용찬(Yongchan Kim),최원섭(Wonseop Choi),오승환(Seungwhan Oh),김창년(Changnyeun Kim),이재승(Jaeseung Lee) 대한설비공학회 2009 설비공학 논문집 Vol.21 No.4
Various types of refrigerators become popular in the market such as a common refrigerator, kimchi refrigerator and wine cellar. It is required to develop a multi type refrigerator combining these refrigerators to save space and energy consumption. In this study. the performance of a multi type refrigerator, which consists of one machine room and three evaporators, was measured in a bench type multi refrigerator. The multi type refrigerator was tested by varying the number of refrigerator cabinet, refrigerant charge, and temperature conditions. In addition, the multi type refrigerator with a suction line heat exchanger(SLHX) was tested to improve system performance. Based on the experimental data, the multi type refrigerator showed better performance than the conventional refrigerator (single type system). Besides. the COP of the single system increased from 1.0 to 1.37, and those of the dual and triple system increased from 1.29 to 1.39, and 1.22 to 1.51, respectively, by applying the SLHX.
R600a를 이용한 소형 멀티형 냉장고 시스템의 성능특성에 대한 실험적 연구
안지훈(Jihoon Ahn),장용희(Yonghee Jang),김용찬(Yongchan Kim),김용한(Yonghan Kim),장의영(Uiyoung Jang),박용종(Yongjong Park) 대한기계학회 2008 대한기계학회 춘추학술대회 Vol.2008 No.5
Various types of refrigerators become popular in the market such as a common refrigerator, kimchi refrigerator and wine cellar. It is required to develop a multi function refrigerator which has different purposes in each evaporator. In this study, the performance of a multi type refrigerator system, which consists of one machine room and three evaporators, was measured in a bench type multi refrigerator. The multi type refrigerator system was tested by varying the number of refrigerator cabinet, refrigerant charge amount, compressor frequency and temperature condition. Based on experimental data, the multi type refrigerator showed better performance than the conventional refrigerator (single type). At the same external load condition, the COP of the multi type refrigerator was 1.2~1.5, but the COP of the single type refrigerator was 0.8. The single and multi type refrigerator cycles were optimized at -30.0℃ and -25.0℃, respectively. Therefore, the multi type refrigerator may show low compression ratio than the single type refrigerator.