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RISS 인기검색어
- 검색키워드
- 주제어 : Joule-Thomson refrigerator(쥴톰슨냉동기) (검색결과 4 건)
- 무료
- 기관 내 무료
- 유료
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홍용주(Yong-Ju Hong),박성제(Seong-Je Park),김효봉(Hyo-Bong Kim),최영돈(Young-Don Choi) 대한기계학회 2005 대한기계학회 춘추학술대회 Vol.2005 No.5
In this study, the cool-down characteristics of a miniature J-T refrigerator with the pressurized bottle, which has the different initial pressures of nitrogen gas and argon, were investigated by experiment. To analyze the cool-down characteristics of the refrigerator, the supply and exhaust pressure, the temperatures on the surface of the cryostat, and the mass flow rate were measured simultaneously. The results show the effect of the supply pressure on the performance of the refrigerator. The influence of the supply pressure and the temperature on the mass flow rate during the cool-down stage is discussed in details.
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홍용주(Yong-Ju Hong),박성제(Seong-Je Park),고득용(Deuk-Yong Koh),최영돈(Young-Don Choi) 대한기계학회 2005 대한기계학회 춘추학술대회 Vol.2005 No.11
As the component density of electronics increases due to smaller line width, so does the power dissipation. Microscale Joule-Thomson refrigerator has gained attention in the cooling of electronics due to the its capability of cooling of small spot. A typical microscale JT refrigerator consists of four main compontents; inlet and outlet ports, counter flow heat exchanger, capillary channel and evaporator. The counter flow heat exchanger and capillary channel have serpentine microchannels. Cooling power is generated by the isenthalpic expansion of a gas through the capillary channel, and the performance is kept by counter flow heat exchanger. In this study, Thermodynamic simulations, which are based on the simple Linde-Hampson system, was undertaken to use it to design a microscale JT refrigerator. The results shows the effect of inlet pressure on the cooling capacity. effectiveness, mass flow rate, evaporator temperature.
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질소-아르곤 혼합가스의 조성비가 쥴톰슨냉동기의 성능에 미치는 영향
홍용주(Yong-Ju Hong) 대한기계학회 2013 대한기계학회 춘추학술대회 Vol.2013 No.12
Miniature Joule-Thomson refrigerators have been widely used for rapid cooling of infrared detectors, optoelectronic device, and integrated circuits of microelectronics. Nitrogen (NBP 77.35K) and argon gas (NBP 87.3K) are typically used as the cryogen due to their easy availability, low cost and being able to achieve a relatively low cryogenic temperature. Argon is recognized as the preferred coolant for rapid cooling below 100K, but the refrigerator does not attain the temperature below 87.3K. Mixture of nitrogen and argon exhibit intermediate performance between the two pure gases. Cooldown with a nitrogen-argon mixture is slower and the runtime is shorter than with pure argon. But, a significant benefit of including nitrogen is in the mixture is that the temperature of operation is lowered. In this study, effectiveness-NTU approach was adopted to predict the thermodynamic behaviors of the heat exchanger for the Joule-Thomson refrigerator with the nitrogen-argon mixture. The results show the effects of the mixture composition ratio on the performance of the heat exchanger and refrigerator for the given heat exchanger.
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홍용주(Yong-Ju Hong),고준석(Jun-Seok Ko),김효봉(Hyo-Bong Kim),박성제(Seong-Je Park) 대한기계학회 2011 대한기계학회 춘추학술대회 Vol.2011 No.10
Gas-charged bellows demand flow control mechanism in the Joule-Thomson(J-T) refrigerator are typically an assembly of a cylindrical bellows that is sealed at both ends and pressurized with a gas. The gas pressure in the bellows increase or decrease as the bellows is heated or cooled, which causes the bellows to expand or contract relative the fixed end and to open or restrict the nozzle. The gas-charged bellows can be adjusted to provide a small excess of the refrigeration at the cold end of the refrigerator to assure a presence of liquid at the cold end. The charged gas and initial pressure are chosen for the desired operating temperature and pressure. In this study, characteristics of a nitrogen gas-charged bellows during cool-down process were investigate by numerical analysis. Some typical results of the thermodynamic analysis is presented.
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