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구경민,김수형,Soowon Lee,Sung-Gyu Kim,Young-Man Jeong,이재근,Nae-Hyun Park,Byung-Chul Na,Yoon-Jae Hwang,Byung-Soon Kim,Joon-Hyun Hwang 한국화학공학회 2013 Korean Journal of Chemical Engineering Vol.30 No.5
We examined the effect of oil retention on the heat transfer performance of a shell-and-tube-type evaporator which had 26 inner tubes and was filled with the refrigerant R-134a. The refrigerant was boiled on the surface of the inner tubes in the evaporator, while chilled water circulated through these tubes. An experimental apparatus was designed to measure both the pressure and temperature profiles at the inlet and outlet of the flooded evaporator. Four windows were installed for observing the operation of the flooded evaporator. A series of experiments were carried out under the following conditions: the refrigerant saturation temperature, 5 oC; refrigerant inlet quality, 0.1; heat fluxes from water to the refrigerant, 5-7 kW/m2. The concentration of the oil retained in the refrigerant was then varied up to approximately 10% to observe the effect on the heat transfer performance of the flooded evaporator. Increasing the oil content (i.e., increasing the concentration up to a maximum of approximately 10%) in the refrigerant R134a did not lead to any appreciable reduction in the overall heat transfer coefficient of a flooded evaporator with multiple-innertubes. When the oil concentration in the refrigerant was approximately 10%, the heat transfer degradation in the case of the flooded evaporator with multiple-inner-tubes was approximately 11%, which was found to be much smaller than the heat transfer degradation in the case of a flooded evaporator with a single-tube (26-49%). This observation suggested that the oil retained in the refrigerant did not significantly deteriorate the heat transfer performance of the flooded evaporator, presumably because the presence of tube bundles promoted forced convection by agitating bubbles.
구경민,황준현,허현,이재근,나병철,황윤재,김병순,안영철 대한기계학회 2016 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.30 No.6
Brazed plate heat exchangers (BPHEX) are broadly used in water source heat pump systems for their large heat transfer capacity. Despite their high heat transfer rate, their high-performance rate tends to decrease sharply, due to fouling and they cannot be cleaned. So the thermal and fouling resistances of washable Shell and helically coiled tube heat exchangers (SCHEX) are designed and experimentally investigated in this study. Heat exchangers with two different tube types are studied and compared with a brazed plate heat exchanger. The overall thermal resistance coefficient of the heat exchangers as determined by using Wilson plots is 38% lower than that of the brazed plate heat exchanger at a Reynolds number of 2460. Fouling test results revealed that regular maintenance and physical cleaning can be used to maintain the thermal resistance of fouling of the washable heat exchanger at a level equal to or less than that of the brazed plate heat exchanger.
도축돈의 폐병변에서 Streptococcus suis 1 (+14)형, 2 (+1/2)형, 7형 그리고 9형의 Multiplex PCR을 통한 검출
구경민,임재향,고홍범,Koo, Kyung-Min,Lim, Jae-Hyang,Koh, Hong-Bum 대한수의학회 2002 大韓獸醫學會誌 Vol.42 No.4
Streptococcus suis is an important swine pathogen in nearly all countries with an extensive pig industry. It is associated with meningitis, arthritis, endocarditis, septicaemia, bronchopneumonia and sudden death. Attempts to control the disease are still hampered the lack of effective vaccines and sensitive diagnostic tools. A PCR method which can be used for the detection of virulent strains of serotype 2, which is most prevalent serotype, and serotype 1 was developed. However, serotype 1, 2, 7 and 9 strains are frequently isolated from diseased pigs. In European countries, S suis serotype 2 is the most prevalent type isolated from diseased pigs, followed by serotype 9 and 1. In Japan, capsular serotype 2 was also the most prevalent serotype, followed by capsular serotype 7. Most of S suis isolated from diseased pigs belong to a limited number of capsular serotype, often those between 1 and 9. We investigated the distribution of S suis serotype 1, 2, 7 and 9 from 740 pig lungs at abattoir in Jeolla and Chungcheong by rapid multiplex PCR assay. Fifty of 740 lung samples, 6.8%, were S suis postitive and identified S suis were divided by 38% (19/50) in serotype 2, 2% (1/50) in serotype 7 and 4% (2/50) in serotype 9. The distribution of S suis serotype in Korea was similar to other countries. Moreover, the multiplex PCR assay may be an useful diagnostic tool for the detection of pigs carrying serotype 1, 2, 7, 1/2, 9 and 14 strains in epidemiological and transmission studies and facilitate control and eradication programs.
구경민(Kyung-Min Koo),김태웅(Tae-Woong Kim),한선하(Seon-Ha Han),안영순(Young-Sun An),전예정(Yae-Jung Jun),이제명(Je-Myung Lee),황수진(Su-Jin Hwang) 한국식품과학회 2021 식품과학과 산업 Vol.54 No.2
HACCP 인증업체의 자율관리 능력을 제고하고 관리가 미흡한 업체 등에 대한 집중관리 등 선택과 집중을 통한 관리가 필요하다. 더불어 스마트 HACCP의 확대, 보급을 통해 HACCP 운영의 효율성과 편의성을 향상 시켜야 한다. 이처럼 HACCP 제도의 내실화와 스마트화 뿐만 아니라 동시에 적용분야를 지속적으로 발굴, 확대하는 것이 우리나라 HACCP이 나아가야할 방향이다. It is necessary to improve the self-management ability of Hazard Analysis Critical Control Point (HACCP) certified companies and intensive management for companies with insufficient management. In addition, the efficiency and convenience of HACCP operation should be improved by expanding and distributing smart HACCP. In this way, it is the direction that HACCP in Korea should go forward to continuously discover and expand the field of application with the improving and smartening the HACCP system.