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자동차용 증발기 판 내의 증발 열전달 및 유동 특성에 관한 실험적 연구
곽경민,주상우,정우열,김택근,김광일,Kwak, Kyung-Min,Joo, Sang-Woo,Jung, Woo-Youl,Kim, Taek-Keun,Kim, Kwang-Il 한국자동차공학회 2007 한국 자동차공학회논문집 Vol.15 No.2
An experimental study was performed to evaluate the in-plate evaporation heat transfer and flow characteristics of a evaporator used in automobile. Two test-cores with different heat transfer area, bead-shape and bead-array were tested, A type and B type. For the heat transfer, Nusselt number for B type test-core reaches a value nearly equal to the one for A type test-core, in the whole range of equivalent Reynolds number. But, for the same mass flow rate of refrigerant, hA for B type test-core becomes higher with the increase of the mass quality of refrigerant than for A type test-core. In a flow visualization experiment, the wake zone of refrigerant circulating at u-turn position of plate is observed.
마이크로핀 관의 기하학적 형상면화에 대한 열전달 특성(II) -증발 열전달-
곽경민,장재식,배철호,정모,Kwak, Kyung-Min,Jang, Jae-Sik,Bae, Chul-Ho,Jung, Mo 대한설비공학회 1999 설비공학 논문집 Vol.11 No.6
The evaporating heat transfer experiments with refrigerant HCFC 22 are performed for performance evaluation using 4 and 6 kinds of microfin tubes with outer diameter of 9.52mm and 7.0mm, respectively. Used microfin tubes have different shape and number of fins with each other, The experimental results are represented with effects of quality, mass flux and EPR. The evaporating heat transfer characteristics are represented by the existence of not only heat transfer area and turbulence promotion effect but also additional other enhancement mechanism, which are the overflow of the refrigerant over the microfin and microfin arrangement. Microfin tubes having a shape which can give much overflow over the microfin show large evaporating heat transfer coefficients. The effect of refrigerant overflow is much severe in evaporation than condensation. The effect of microfin arrangement is related to overflow effect of the refrigerant over the microfin.
곽경민,배철호,정모,이상천,Kwak, Kyung-Min,Bae, Chul-Ho,Jung, Mo,Lee, Sang-Chun 대한설비공학회 1998 설비공학 논문집 Vol.10 No.6
Prediction method for heat transfer coefficients in a horizontal smooth tube with forced convection condensation is proposed. In this paper, the analogy between momentum and heat transfer was applied to an annular flow regime and the logarithmic velocity distribution is applied to describe the velocity profile within the liquid film. Prediction results are compared with those of experimental ones. The test refrigerants are R113, R22, R134a, R407C(R33/R125/R134a, 23/25/52 wt%), R410A(R32/R125, 50/50 wt%) and R134a+R123(R134a/R123, 85.5/14.5 wt%) which are used under operating conditions in a condenser of air-conditioner. The proposed prediction method shows good agreement with experimental data within$\pm 30%$ for pure refrigerants. For the mixture refrigerants including the ternary mixture refrigerant R407C, condensation heat transfer from this study are higher than those from experiments. By correcting the constant in two-phase frictional multiplier, the predicated heat transfer coefficients become similar to the experimental results.
마이크로핀 관의 기하학적 형상변화에 대한 열전달 특성 (I) - 응축 열전달 -
곽경민,장재식,배철호,정모,Kwak, Kyung-Min,Jang, Jae-Sik,Bae, Chul-Ho,Jung, Mo 대한설비공학회 1999 설비공학 논문집 Vol.11 No.6
To examine the enhancement mechanism of condensing heat transfer through microfin tube, the condensation experiments with refrigerant HCFC 22 are performed using 4 and 6 kinds of microfin tubes with outer diameter of 9.52mm and 7.0mm, respectively. Used microfin tubes have different shape and number of fins with each other The main heat transfer enhancement mechanism is known to be the enlargement of heat transfer area and turbulence promotion. Together with these main factors, we can find other enhancement factors by the experimental data, which are the overflow of the refrigerant over the microfin and microfin arrangement. The overflow of the refrigerant over the microfin can be analyzed by the geometric shape of the microfin. Microfin tubes having a shape which can give much overflow over the microfin show large condensing heat transfer coefficients. The effect of microfin arrangement is related to the heat transfer resistance of liquid film of refrigerant. The condensing heat transfer coefficients are high for the microfin tube with even distribution of liquid film.
폐열회수형 환기장치의 휘발성유기화합물 배출 특성에 관한 연구
곽경민(Kyung-Min Kwak),배철호(Cheol-Ho Bai),배효석(Hyo-Seok Bai),김지용(Jee-Yong Kim),주의성(Euy-Sung Chu) 대한설비공학회 2006 대한설비공학회 학술발표대회논문집 Vol.2006 No.11
This study is to evaluate the emission characteristics of VOCs from indoor side the heat recovery ventilator system. The operating conditions are flow rate and operating time under KS cooling and heating standard condition, 2 kind of elements in heat recovery ventilator are used, L and M type. The VOC concentrations from heat recovery ventilator with M type and L type elements have no effect on variation of flow rate and operating time. The VOC concentrations on the cooling condition is much larger than those of heating condition.
Wi-Fi 전자책 단말기를 위한 전자책 컨텐츠 다운로드 서버 설계 및 구현
곽경민 ( Kyung-min Kwak ),김효곤 ( Hyo-gon Kim ) 한국정보처리학회 2010 한국정보처리학회 학술대회논문집 Vol.17 No.1
전자 출판 기술과 전자책 단말기의 발전으로 전자책 컨텐츠의 보급이 확산되면서 전자책은 정보 자료로써 그 중요성이 더해가고 있으며 전자책 단말기를 통하여 컨텐츠를 다운로드 받으려는 요구가 증가 되어 가고 있다. 전자책 컨텐츠 다운로드 서버를 개발하기 위해서는 전자책 단말기의 하드웨어 특성이 고려되어야 한다. 본 논문에서는 Wi-Fi 전자책 단말기의 하드웨어 특성을 고려하여 Wi-Fi 전자책 단말기를 통해 전자책 컨텐츠를 효과적으로 다운 받을 수 있는 다운로드 서버를 설계 및 구현 하였다.
수중 위치 추정을 위한 3차원 전자기파 센서 노드 개발
곽경민(Kyung Min Kwak),김진현(Jinhyun Kim) 제어로봇시스템학회 2013 제어·로봇·시스템학회 논문지 Vol.19 No.2
In this paper, we discuss a 3-dimensional localization sensor node using EM waves (Electromagnetic waves) with RSSI (Received Signal Strength Indicator). Generally EM waves cannot be used in underwater environment, because the signal is highly attenuated by the water medium according to the distance. Although the signal quickly reduces in underwater, the reducing tendency is very clear and uniform. Hence EM waves have possibility as underwater distance sensors. The authors have verified the possibility by theory and several experiments, and developed calibration methods in case of linear and planer environment. For 3-dimensional localization in underwater, it must be known antenna’s radiation pattern property in electric plane(called E-plane). In this paper, we proceed experiments to verify attenuation tendency with z axis movement, PLF(Polarization Loss Factor) and ILF (Inclination Loss Factor) with its theoretical approach.
곽경민(Kyung-Min Kwak),최성종(Sung-Jong Choi),조현덕(Hyun-Deog Cho) 한국기계가공학회 2008 한국기계가공학회 춘추계학술대회 논문집 Vol.2008 No.-
This study is to propose a new model of upper mold(wind header) which can be reduced temperature deviation and increased cooling velocity in mold surface cooling The proposed mold with flow resistance partially have even pressure deviation compared to the common mold. The pressure deviation of cooling surface shows max. 40% in common mold and less than 10% in proposed mold. The heat transfer experiment verified reduction of temperature deviation in proposed mold, and the cooling velocity of proposed mold showed 15.6% higher than that of common mold.