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RISS 인기검색어
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- 저자 : 전창덕 (검색결과 106 건)
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전창덕 한국교통대학교 2020 한국교통대학교 논문집 Vol.55 No.-
In the standard cooling conditions specified in KS C 9306, tests were performed for the case of no water injection and the case of water injection. In particular, in order to investigate the effect of the water injection position on the air conditioner performance, an experiment was conducted by changing injection position to the refrigerant inlet area of the condenser , the middle area, and the refrigerant outlet area. As a result of the experiment, the case of injecting water droplets to the refrigerant outlet area showed 6.2% COP improvement effect compared to the case of not spraying.
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全昌德 忠州大學校 1998 한국교통대학교 논문집 Vol.33 No.1
An experimental study on the characteristics of condensation heat transfer and pressure drop of brazed plate heat exchangers using R-22 has been performed. The experimental condition of mass flux and inlet saturation pressure of the refrigerant were in the range of 20 to 120kg/㎡s and 1.4 to 1.6Mpa respectively. The pressure drop and heat transfer coefficient were compared with the previously proposed correlations. The conclusion is as follows. As the mass flux increases, the trend of increase of both pressure drop and heat transfer coefficient was obtained. The more chevron angle increases, the lower the pressure drop and heat transfer coefficient are. For the case of applying subcooled state at inlet and outlet, scarcely pressure drop and heat transfer coefficient were influenced as inlet saturation pressure changes. The specific pressure drop was calculated and maximum specific pressure drop appears at chevron angle 20˚. When inlet and outlet flow was two-phase, pressure drop and heat transfer coefficient were decreased according to increase of inlet saturation pressure. When inlet state is superheated and outlet state is subcooled, pressure drop and heat transfer coefficient decrease as increase of inlet saturation pressure.
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全昌德 忠州大學校 1996 한국교통대학교 논문집 Vol.31 No.1
An experiment study was performed to investigate the characteristics of condensation heat transfer and pressure drop of a multi-channel tube using HFC-134a as working fluid. The mass flux and inlet saturation temperature of the refrigerant were controlled, respectively, in the range of 200 to 400kg/m2s and 40 to 60℃. The trend was obtained that the increase of the mass flux and temperature of working fluid resulted in the increase of the heat transfer and pressure drop.
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내부열교환기가 구비된 실외기 코일을 이용한 에어컨 성능 향상 기술
전창덕 韓國交通大學校 2013 한국교통대학교 논문집 Vol.48 No.-
The objective of this feasibility study is to investigate the effect of performance enhancement when an internal heat exchanger is used in a refrigeration system, for example an air conditioner. Conventional system occurs several problems when internal heat exchangers are applied. New configuration of internal heat exchanger is suggested, consisted of double pipes. Theoretically performance enhancement of suggested system is about 17% better than that of conventional system at the condition of 40℃ condensation temperature, -20℃ evaporation temperature and 0.8 effectiveness.
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응축압력 변화에 따른 R407C의 응축특성에 관한 연구
전창덕,장경근,김창덕,이진호 대한설비공학회 2003 설비공학 논문집 Vol.15 No.3
R407C is considered as alternative refrigerant of R22 for air conditioners. Experimental investigation is made to study the condensation heat transfer characteristics of slit fin-tube heat exchanger using alternative refrigerant, R407C. Experiments are carried out at condensation pressure of 2110 kPa and 1943 kPa with the degree of superheat of 1$0^{\circ}C$ and mass flux varying from 150 to 250 kg/$m^2$s for refrigerant side. The inlet air condition is dry bulb temperature of 35$^{\circ}C$, relative humidity of 50% and air velocity varying from 0.8 to 1.6 m/s. Experiments show that pressure drop gets smaller at a higher condensation pressure especially when condensation pressure is raised from 1943 to 2110 kPa. Heat transfer rate gets smaller at a lower condensation pressure in the range of experimental condition.
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전창덕,장성운 충주대 산업과학기술연구소 1997 産業科學論文集 Vol.5 No.-
This study considers the effects of internal air supply and exhaust system according to the change of locations in a large space. Especially PHOENICS CFD code was used. The velocity and temperature distribution were presented for various parameters such as air speed and heat source.
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Intercellular Adhesion Molecule-1 (ICAM-1)의 분자구조와 기능
전창덕 한국통합생물학회 2001 한국동물학회 뉴스레터 Vol.18 No.2
Intercellular adhesion molecule-1 (ICAM-1)은 T 세포의 활성이나 면역세포가 염증작용이 일어나고 있는 곳으로 옮겨갈 때 중요한 역할을 수행하는 당단백질 (glycoprotein)으로서 2-integrin 계열의 분자인 leukocyte function associated antigen-1(LFA-1)이나 Mac-1의 수용체이며 세포의 막에 homodimer인 상태로 발현되어진다. ICAM-1은 5개의 세포외 domain과 transmembrane domain(TM) 및 짧은 cytoplasmic domain을 갖고 있으며, dimerization motif는 domain 5 또는 TM인 것으로 알려져 있다. 최근의 crystal 구조분석 결과에 의하면 domain 1에도 dimerization motif가 있는 것으로 추정되어지지만 정확한 실험적인 뒷받침이 되어져 있지 않다. 본 연구에서는domain 1에 dimer를 형성할 수 있는 motif가 존재하는 지에 대한 실험적인 증명과 함께 ICAM-1이 세포의 막에서 어떠한 구조를 갖고 있는지에 대한 최근의 연구성과를 보고하고자 한다.
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전창덕 한국교통대학교 2021 한국교통대학교 논문집 Vol.56 No.-
In the standard cooling conditions specified in KS C 9306, tests were performed for the case of no water injection and the case of water injection at 70mm and 90mm distance in order to investigate the effect of the water injection location on the air conditioner performance. The refrigerant inlet area, the middle area, and the refrigerant outlet area of the condenser were considered as injection location. As a result of the experiment, the case of injecting water at 70mm distance on the refrigerant outlet area showed 7.1% COP improvement effect compared to the case of not spraying.
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알루미늄 다채널관을 사용한 수랭식 열교환기 성능 연구(I)
전창덕 한국교통대학교 2018 한국교통대학교 논문집 Vol.53 No.-
Comparative experiments were carried out to investigate the heating performance of Alfa Laval plate heat exchanger and water-cooled aluminum micro-channel heat exchanger under the heating condition(entering temperature 40±0.5°C, leaving temperature 45±0.5°C) described in KS B 6275. The following conclusions were obtained. The heating capacity of both heat exchangers is the same as that of 16kW, and the power consumption of the heat exchanger of aluminum microchannel is higher by 100W
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대체냉매 R407C 및 R410A를 이용한 슬릿휜-관 열교환기의 응축특성에 관한 연구
전창덕,장경근,강신형,이진호 대한설비공학회 2002 설비공학 논문집 Vol.14 No.9
R410A and R407C are considered to be alternative refrigerants to R22 for the air-conditioners. Experimental investigation is made to study the condensation heat transfer characteristics of slit fin-tube heat exchanger using alternative refrigerants R410A and R407C. R407C, a non-azeotropic refrigerant mixture, exhibited a quite different condensation phenomenon from those of R22 and R410A and its condensation heat transfer coefficient was much lower than that of R22 and R410A. Between the R22 and R410A, the condensation heat transfer coefficient of R410A, near-azeotropic refrigerant mixture, was a little higher than that of R22. R410A also showed the lowest condensation pressure drop across the test section. For all refrigerants, the condensation heat transfer coefficient and pressure drop increase as the mass flux increases.
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