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Application of CFD to the Calculation of 2 Phase Cryogenic Heat Transfer Processes
유걸(Jie. Liu),악해파(Haibo Yue),정모(Mo Chung),배철호(Cheolho Bai) 한국전산유체공학회 2011 한국전산유체공학회 학술대회논문집 Vol.2011 No.5
A two-phase numerical model for plate-fin heat exchangers with plain fins and wave fins is studied incorporating the thermodynamic properties and the characteristics of fluid flow. The numerical simulations for the two fins in cryogenic conditions are carried out by employing a homogenous two-phase flow model with the CFD code ANSYS CFX. The heat transfer coefficients and the friction factor for nitrogen saturated vapor condensation process inside two types of plate fin heat exchanger are evaluated including the effects of saturation temperature (pressure), mass flow rate and inlet vapor quantity. The convective heat transfer coefficients and friction factors will be used for design of plate-fin type heat exchangers operating under cryogenic conditions.
Two-phase Convective Heat Transfer in a Plate-Fin Type Heat Exchanger
유걸(Jie Liu),정모(Mo Chung),배철호(Cheolho Bai) 대한기계학회 2011 대한기계학회 춘추학술대회 Vol.2011 No.5
A two-phase numerical model for plate-fin heat exchangers with plain fins is studied incorporating the thermodynamic properties and the characteristics of fluid f1ow. The numerical simulations for heat exchangers with plate fin in different conditions are carried out by employing a homogenous two-phase flow model with the CFD code ANSYS CFX. The heat transfer coefficients and the friction factor for nitrogen saturated vapor condensation process inside a plate fin heat exchanger are evaluated including the effects of saturation temperature (pressure), mass flow rate and inlet vapor quantity. The convective heat trasfer coeffcients and friction factors will be used for design of plate-fin type heat exchangers operating under cryogenic conditions.
진태환(Tae-Hwan Jin),유걸(Jie Liu),정모(Mo Chung),신기열(Ki-Yeol Shin) 대한기계학회 2020 大韓機械學會論文集B Vol.44 No.12
본 연구에서는 당진시 스마트팜 단지 조성을 위한 열에너지 공급안을 분석하였다. 먼저 TRNSYS 프로그램으로 시계열 날씨 정보와 3D 벤로형 유리온실 모델을 통해 동적 에너지부하를 산정하였다. 그리고 경유보일러, 발전온배수, 하천수, 외기열 활용 열펌프를 동적 에너지부하를 통해 적정용량으로 난방설비 모델로 구성하였고, 저온성 및 고온성 작물의 생육조건에 맞는 난방운전 모델을 구성하였다. 이를 통해 case별 난방성능 평가와 경제성 평가를 위한 case study를 수행하였다. 그 결과, 해당 지역에서는 저온성 작물이 고온성 작물에 비해 400% 가량 더 우수한 경제성을 가지며, 고온성 작물에는 50% 이상의 금융 보조금이 필요한 것으로 평가되었다. 또 열펌프를 사용한 경우 보일러에 비해 운영비를 40% 가량 감소시킬 수 있어 보다 우수한 경제성을 가지는 것으로 분석되었다. In this paper, the thermal energy supply plan for a smart farm complex in Dangjin area was analyzed. First, the dynamic energy load was calculated by time-series weather data and 3D venlo-type glass greenhouse model with the TRNSYS program. In addition, the boiler and power plant waste water source heat-pump, stream water source heat-pump, and the ambient air source heat-pump was configured as the heating facility model with optimum capacity through dynamic energy load value. The heating simulation to maintain growth conditions of crops familiar with low-temperature and high-temperature was also performed. Through these models, the heating performance and economic evaluation in each cases were carried out. As a result, it was evaluated that low-temperature crops (strawberry) has a better economic performance by 400 % than high-temperature one (tomato), and 50 % or more of government subsidies should be required for high-temperature crops. It was analyzed that the heat pump heating cases showed better economic efficiency because the operating cost could be reduced by about 40 % compared to the boiler.
Characterization of Bacillus mojavensis KJS-3 for the Promotion of Plant Growth
Kang Min Kim(김강민),Jie Liu(유걸),Youn Suk Go(고윤석),Jae Seon Kang(강재선) 한국생명과학회 2015 생명과학회지 Vol.25 No.8
최근 식물 성장에 있어 곰팡이 독소에 관련된 질병에 효과가 있는 Bacillus mojavensis 균주 사용의 보고가 있다. 우리는 B. mojavensis KJS-3균주의 다양한 온도, 염도, 에탄올, pH에서 성장하는 특징을 확인 하였다. B. mojavensis KJS-3균주는 Polymerase chain reaction 분석에 의해 fengycin을 LC-MS/MS 분석을 통해서는 iturin 및 surfactin와 같은 cyclic lipopeptides를 생산함을 확인 하였다. B. mojavensis KJS-3균주는 식물 유해 곰팡이 균주인 Botrytis cinerea, Rhizoctonia solani AG-4, Sclerotinia sclerotiorum, Colletotricum goeosporioides에 항곰팡이 효과가 있음을 확인하였고 이 결과를 바탕으로 인삼재배에 있어 B. mojavensis KJS-3를 사용하여 성장을 관찰한 결과 뿌리 내에서 성장하여 plant growth promoting endophyte가 있음을 알 수 있었다. 이러한 특징들에 의해 미생물 농약 및 비료로 사용할 수 있을 것이다. Scientists have recently shown an interest in the characteristics of Bacillus mojavensis strains because of their increasing use in plants as a defense against diseases and mycotoxins. We have shown here that B. mojavensis KJS-3 possesses the typical characteristics of B. mojavensis strains including a strong resistance to high temperatures (≤50°C), tolerance to high salt concentrations (7% NaCl), ethanol tolerance (40% ethanol), and pH range for growth (pH 5-9). B. mojavensis KJS-3 has been used for the production of cyclic lipopeptides including important antifungal substances such as surfactin, iturin, and fengycin. Polymerase chain reaction analysis in this study showed that B. mojavensis KJS-3 can be used for the production of fengycin and the findings of LC-MS/MS analyses suggest that B. mojavensis KJS-3 can be used to produce iturin and surfactin. Antifungal activity analys is confirmed that B. mojavensis KJS-3 has antifungal effects on Botrytis cinerea, Rhizoctonia solani AG-4, Sclerotinia sclerotiorum, and Colletotricum goeosporioides. A microscopy assessment of the roots of wild ginseng plants planted together with B. mojavensis KJS-3 revealed that the roots contained B. mojavensis KJS-3, confirming the bacteria to be a plant growth promoting endophyte (PGPE) which acts against plant diseases and mycotoxins. Our findings lead us to conclude that B. mojavensis KJS-3 can be produced at an industrial level as a microbial pesticide or microbial fertilizer.