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Performance of Oil-Separator Adopting Nature-Inspired Surface
Jang, Seongil,Ahn, Joon,Lim, Si Hyung Korean Society for Precision Engineering 2015 International Journal of Precision Engineering and Vol.16 No.10
In order to improve a refrigeration system's energy efficiency, the separation efficiency of its oil separator should be improved. To do so, we turned to nature for inspiration. A Namib Desert beetle collects water in fog by using its skin, which combines hydrophilic and hydrophobic surfaces. Inspired by nature's design, we applied a surface with oleophilic and oleophobic patterns to an oil separator used in a refrigeration system. In order to make the oil separator, an appropriate design was established using computational fluid dynamics. A cyclone-type oil separator was produced with an oleophobic-treated surface on its lower cup. The efficiency of the treated surface of this oil separator was tested with an open-type experimental setup using an oil mist generator. To obtain conditions similar to those of a refrigeration system in the open-type experimental setup, the oil particle diameter and working fluid pressure were set to yield a Stokes number similar to that of oil particles in the oil separator of the refrigeration system. The oil separator with the treated oleophilic-oleophobic surface improved its oil separation efficiency by 1.67% and its pressure drop by 2.48% compared to a conventional cyclone-type oil separator.
A Numerical Analysis on Separating Performance for Oil Separator
Seongil Jang,Joon Ahn 한국전산유체공학회 2014 한국전산유체공학회 학술대회논문집 Vol.2014 No.10
A series of numerical simulation has been carried out to study performance of a cyclone type oil separator, which is designed for the compressor of a refrigeration system. Working fluid is R22, which is a typical refrigerant, and mineral oil droplet is supplied. Pitch of the helix is considered as design parameters to make a compact separator. Depending on the helix pitch, separation efficiency varies from 97.5 to 99%, while predicted pressure drop ranges from 5 to 6.5 kPa. Considering both of the pressure drop and separation efficiency, helix pitch of the separator has been designed as 50 mm.
장성일(Seongil Jang),안준(Joon Ahn) 대한설비공학회 2015 설비공학 논문집 Vol.27 No.8
A series of numerical simulations have been carried out to study the performances of cyclone-type oil separators, which are designed for refrigeration-system compressors. The corresponding working fluid is R22, which is a typical refrigerant, whereby a mineral-oil droplet is supplied (Ed-highlight-My interpretation). The outlet-tube length in relation to the total chamber volume is considered a design parameter. Depending on the tube length, the separation efficiency varies from 98.7% to 99.3%, while the predicted pressure drop is between 5.1 ㎪ and 6.4 ㎪. Considering both the pressure drop and separation efficiency, the length of the outlet-port tube of the separator is 152 ㎜.
바이오 수소 생산에 사용가능한 열원 탐색을 위한 IGCC 배열분석
장성일(Seongil Jang),안준(Joon Ahn) 대한설비공학회 2018 대한설비공학회 학술발표대회논문집 Vol.2018 No.6
세계적으로 친환경 에너지 개발의 필요성은 점점 더 부각되고 있다. 새로운 친환경 에너지 개발의 필요성이 대두되고 있으며, 수소경제가 부상하고 있다. 그에 따라서 국내 최초로 발견한 초고온성 고세균인 Thermococcus onnurineus NA1의 특성을 활용해서 일산화탄소에서 수소를 만들어 내는 반응기를 만들고 구동하기 위한 연구가 진행중이다. 해당연구에서는 해당 반응기의 열수지 분석을 진행한 결과에서 나온 구동 열량을 충족시켜서 반응기를 구동시킬 수 있는 열원을 찾기로 하였다. 반응기를 설치할 예정인 IGCC공정에서의 열원분석을 통해서, 구동에 충분한 열량을 공급해 줄수 있는 열원을 모색하기로 하였다. 반응기의 경우 구동열량은 302 kW이고, 예열 열량은 1547 kW인데 비해서, IGCC에서 찾아낸 열원의 열량은 16,991.2 ~ 1,273,699 kW로 반응기를 구동시키는데 충분한 열량을 공급할 수 있다는 점을 확인하였다.
장성일(Seongil Jang),안준(Joon Ahn) 한국전산유체공학회 2014 한국전산유체공학회 학술대회논문집 Vol.2014 No.5
In order to improve a refrigeration system’s energy efficiency, the separation efficiency of its oil separator should be improved. To do so, new oil separator used in a refrigeration system has been developed. The separation efficiency and pressure drop were predicted using CFD. Numerical analysis was performed using FLUENT 14.0. A series of numerical simulation has been conducted while changing the helixl pitch and the length of the oil separator. Taking into account the pressure drop and separation efficiency, the dimensions were decided to be 272 mm in total length, and 50 mm in the pitch.