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        • SCOPUSKCI등재

          H<sub>2</sub>O/LiBr+HO(CH<sub>2</sub>)<sub>3</sub>OH계 공냉형 이중효용 흡수식 냉방시스템의 사이클 해석

          권오경,문춘근,윤정인,Kwon, Oh-Kyung,Moon, Choon-Geun,Yoon, Jung-In 대한기계학회 1999 大韓機械學會論文集B Vol.23 No.2

          A cycle analysis was achieved to predict the characteristics by comprehensive modeling and simulation of an air-cooled, double-effect absorption system using a new $H_2O/LiBr+HO(CH_2)_3OH$ solution. The simulation results showed that the new working fluid may provide the crystallization limit 8% higher than the conventional $H_2O/LiBr$ solution. With a crystallization margin of 3wt%(weight%), the optimal solution distribution ratio was found in the range of 36 to 40%. Variation of cooling air Inlet temperature has a sensitive effect on the cooling COP and corrosion problem. The simulation of heat exchangers with UA value revealed that the absorber and the evaporator are relatively important for an air-cooled system compared with the condenser and the low temperature generator. The effect of cooling air flow rate, circulation weak solution flow rate and chilled water inlet temperature were also examined. The new working fluid may provide the COP approximately 5% higher than the conventional $H_2O/LiBr$ solution.

        • KCI등재
        • KCI등재

          반복세탁 및 전단·인정변형에 따른 텐셀직물의 피로도

          권오경,이창미,김묘향,박희웅,Kwon, Oh-Kyung,Yi, Chang-Mi,Kim, Myo-Hyang,Park, Hee-Ung 한국의류산업학회 1999 한국의류산업학회지 Vol.1 No.3

          This study was conducted to examine the fatigue phenomenon of mechanical properties in tencel fabrics by repeated washing & shear and tensile deformation. The obtained results are as follows. After performing repeated shear tensile deformation, RT of tencel showed higher increase rate than that of cotton and rayon, whereas its WT and EM was a smaller decrease rate than that of them. This means that tencel's resistance to tensile deformation was the greatest. In the repeated washing and shear tensile deformation, tencel's 2HB, 2HG and 2HG5 showed a remarkable increase rate. In terms of deformation frequency, the greatest change rate appeared at the time of 1000 cycles of repeated shear tensile deformation and 15 times of repeated washing. In the hand value and THV, KOSHI showed a higher increase rate for tencel than for cotton and rayon in both repeated washing and shear tensile deformation, and NUMERI showed a higher increase rate. In the THV the change rate of rayon and cotton could be rarely seen but for tencel, it decreased. tencel's change rate of thermal insulation value by materials was 1.08%, and it increased as the washing frequency increased, compared to the grey fabrics, whereas the change rates of cotton and rayon were 0.74% and 0.22%, respectively. The qmax decreased in the order of cotton>tencel>rayon as the washing frequency increased.

        • SCOPUSKCI등재

          수직관 흡수기의 물질전달에 미치는 계면활성제의 영향

          권오경,윤정인,윤재호,Kwon, Oh-Kyung,Yoon, Jung-In,Yun, Jae-Ho 대한기계학회 2003 大韓機械學會論文集B Vol.27 No.5

          This study was concerned with the enhancement of mass transfer by surfactant added to the aqueous solution of LiBr. Different vertical inner tubes were tested with and without an additive of normal octyl alcohol. The test tubes were a bare tube, groove tube, corrugate tube and inserted spring tubes. The additive concentration of normal octyl alcohol as a surfactant is about 0.08mass%. The Sherwood number was measured as a function of film Reynolds number 20~200. The experimental results were compared with those which use no surfactant. The enhancement of mass transfer by Marangoni convection effect which was generated by addition of the surfactant is proved for each testing tube Especially, it is clarified that the tube with the spring has the highest enhancement effect. A correlation of the experimental mass transfer data for the bare, groove, corrugate and insert spring tubes results expressed as the form of Sh=cㆍ Re$_{f}$ $^{n}$ .

        • KCI등재

          마직물 및 마혼방직물의 온열특성에 대한 흡습의 영향

          권오경,이참미,성우경,Kwon, Oh-Kyung,Yi, Chang-Mi,Sung, Woo-Kyung 한국의류산업학회 1999 한국의류산업학회지 Vol.1 No.2

          The thermal properies of the pure linen fabrics available in the market and linen blended woven fabrics were measured at the moisture content of 0%, 20%, 40% and 60% using KES-F7 system (Thermo Iabo II type). The experimental properties were statistically analyzed by the rate of water absorbent. The main results were as follows; There is a positive correlation between the thermal insulation value (TIV) and thickness of pure linen fabrics and linen blended woven fabrics by water absorption. Whereas an negative correlation exists between the TIV and cover factor. There is a high positive correlation among the thermal conductivity (k), thickness and weight of pure linen fabrics and linen blended woven fabrics by water absorption. Wherase a high negative correlation exist between the k and air' permeability (Ap). There is a high positive correlation between the feeling of warmth/coldness and bulk density of pure linen and linen blended woven fabrics by water absorption. Wherase a high negative correlation exists between the feeling of warmth/coldness and porosity. There is a negative correlation between TIV and $q_{max}$ of pure linen fabrics and linen blended woven fabrics. The higher the rate of water absorbent, the lower the TIV. This means that TIV decreases by water absorption. As for the thermal property by rate of water absorbent $q_{max}$ and k increase by water absorption and reach max-value at 60% rate of water absorbent. The TIV decreases by water absorption and has +value at 0% rate of water absorbent, whereas it has -value with a feeling of coldness at 20%, 40%. and 60% rate of water absorbent.

        • KCI등재

          컴퓨터 CPU 냉각용 미세채널 워터블록의 열성능에 관한 연구

          권오경(Oh-Kyung Kwon),최미진(Mi-Jin Choi),차동안(Dong-An Cha),윤재호(Jae-Ho Yun) 대한기계학회 2008 大韓機械學會論文集B Vol.32 No.10

          The object of this paper is to study on the thermal performance of a micro channel water block for computer CPU cooling. The effects of liquid flow rate, micro channel width and height on the thermal performances of water block are investigated experimentally. The water block was fabricated Al and machined with a micro milling. The water block consisted of rectangular micro channels 0.5 to 0.9㎜ width and 1.5 to 4.5 ㎜ height. The experiments were conducted using deionized water, over a liquid flow rate ranging from 0.2 to 2.0 ㎏/min. The base temperature and thermal resistance decrease with increasing of liquid flow rate. The increase of a channel height is more effective on the thermal resistance than the decrease of a channel width. At the flow rate of 0.7 ㎏/min, input power of 100W, the base temperature and thermal resistance of sample 6 is 33℃ and 0.13 ℃/W respectively.

        • KCI등재

          흡수식 냉온수기 증발기용 전열관의 전열성능에 관한 연구

          권오경(Oh-kyung Kwon),차동안(Dong-an Cha),윤재호(Jae-ho Yun),김효상(Hyo-sang Kim) 대한설비공학회 2009 설비공학 논문집 Vol.21 No.4

          The objectives of this paper are to measure the heat transfer and pressure drop of the heat transfer tube for an evaporator of absorption system applications. Five types of heat transfer tubes with different shape and heat transfer area are tested in the present experiment. Heat transfer and pressure drop performance of heat transfer tubes are measured in various operating conditions, and compared each other. The results show that the heat transfer coefficient of thermoexcel notch tube increases about 79.6% and 45.3% at the film Reynolds number 69.7 compared with that of bare tube and Jow fin tube, respectively. The thermoexcel notch tube is show the best performance considering pressure drop and heat transfer coefficient.

        • KCI등재
        • KCI등재

          쉐브론 각도변화에 따른 판형 고온 용액열교환기의 성능평가

          권오경(Oh-kyung Kwon),차동안(Dong-an Cha),윤재호(Jae-ho Yun),김효상(Hyo-sang Kim) 대한기계학회 2009 大韓機械學會論文集B Vol.33 No.7

          The objectives of this paper are to measure the heat transfer and pressure drop of the plate heat exchangers for absorption system applications. Three types of plate heat exchangers with different chevron angles are tested in the present experiment. Heat transfer and pressure drop performance of plate heat exchangers are measured in various operating conditions, and compared each other. The results show that the heat transfer rate of high theta (120°) and mixed theta plate heat exchanger increases about 118% and 98% at the solution flow rate 350 ㎏/h compared to that of low theta (60°), respectively. The effectiveness of high theta was evaluated about 0.53 ~ 0.85 in this experimental range. The experimental correlations of the Nu and f were developed with error bands of ±7% and ±12%.

        • KCI등재

          아시아권 속담의 구연양태와 세계인식 방법

          권오경 ( Kwon Oh-kyung ) 한국문학언어학회(구 경북어문학회) 2018 어문론총 Vol.78 No.-

          이 글은 아시아권역 속담의 구연양태를 살펴보고 아시아 사람들이 개인과 가정, 사회, 국가와 민족, 신과 자연을 어떻게 인식하고 있는지를 속담을 통하여 살펴보고자 하였다. 먼저, 속담을 구성하고 구연하는 양태를 중심으로 살펴본 결과, 속담의 형성 배경과 관련한 속담, 수수께끼나 시(詩), 게임 형식을 통하여 구연되는 속담, 공식어구나 감탄구를 사용하는 속담 등으로 크게 나눌 수 있었다. 배경이야기를 동반하는 경우는 문화권과 무관하게 공통적으로 존재한다. 시 형식의 속담 구연은 터키나 몽골과 같이 구연문화가 발달한 지역에서 성행하고, 게임형식으로 전승되는 경우는 일본의 속담카드 놀이를 들 수 있다. 그리고 수수께끼 형식으로 구연되는 경우는 중국의 헐후어가 대표적이다. 이란과 이라크로 대표되는 페르시아 문화권의 속담은 ‘신이 말하건대’ 와 같은 공식어구나 ‘Alas,(아-)’와 같은 감탄구를 많이 사용하는 특징이 있다. 그리고 세계인식 방법 중에서 개인과 관련된 속담의 경우, 양심, 선행 등이 강조되며 질투나 금전, 언행 조심 등을 언급하는 경우가 많다. 가정의 경우는 어머니의 사랑이나 자식 사랑, 첩의 문제 등이 거론된다. 사회와 관련해서는 친구의 중요성을 언급하면서 배신을 가장 부정한 것으로 보았다. 동남아는 농사 관련, 서남아시아는 상업 관련 속담이 많다. 국가와 민족, 혹은 신이나 자연과 관련한 속담은 이슬람권의 신에 대한 찬양을 제외하면 일반적으로 많지 않다. 이것은 속담이 일상생활에서 교훈이나 지침, 지혜가 될 만한 내용을 담는 생활처세술과 관련되어 사용되기 때문인 것으로 풀이된다. 본 논문은 아시아지역에 전승하는 속담의 구연양태나 주제적 접근을 위한 시안(試案)에 해당한다. 따라서 한국의 속담과 특정 국가의 속담을 비교하거나 특정 영역이나 기능을 상호 비교하는 단계까지는 나아가지 못하였다. 다만, 아시아 전반에 대한 속담의 존재양상과 세계인식방법에 대하여 살핀 것에서 그 의의를 가지고 이러한 내용이 향후 한국문화교육이나 다문화교육에 활용되기를 기대한다. In this paper, I researched about The types of performance and world view of Asian Proverbs. The results are as follows; First, The types of oral performance are classified by 4 types, 1)proverbs which accompany with behind story, 2)poem style, 3)game style, 4)proverbs which with formulaic word. Behind story or back story is related with the occurrence of proverb. And poem style assist of rhythm and memory and mellow speaking. The proverbs of game style are related with the social usages and an abridged sentence. Especially Japan has proverb cards to play and study proverbs. And in the Persia area, there are many proverbs with formulaic word like 'Alas-', the catch phrase. And another case, there are some proverbs with guidance words to have authority or dignity. Second, The types of world view in the Asian proverbs are also very important to study the Asian thinking method. To research this, I classified fifth categories; ㉠individual category ㉡family ㉢society ㉣nation or tribe, race ㉤God or nature. The case of ㉠individual category, there are about conscience, virtue, careful with money, speaking, jealousy. And ㉡proverbs including the love of mother, teaching of children, and second wife except the love of father or brotherly love. Regarding ㉢in society category, some proverbs have friend, lover. Especially betray is very unfairness in Persia area. Mongolian think that harmony and unity is very important among the social group. Agriculture is higher than commerce in south east Asian. But West Asian is opposite. ㉣Nation or tribe category and ㉤God or nature, race category are rare in proverbs. Because the proverbs are regarding the daily life or instruction of way of life. In fact, we need the criterion to divide the proverb as usual or unusual, as abstraction, or concrete. Unusual or abstractive proverbs are unuseful as text to study the types of performance and world view. But we have no criterion unfortunately. Because proverb performs in context, but we have no information about the fieldwork reports about the strategy to speaking. Therefore, so many field works are expected. This is a critical situation.

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