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윤백,박현연,유국철,김용찬,Yoon, Baek,Park, Hyun-Yeon,Yoo, Guk-Chul,Kim, Yong-Chan 대한설비공학회 1999 설비공학 논문집 Vol.11 No.4
A computer program was developed for simulating performance(capacity, power consumption and etc.) of air-conditioners using compressor, fin-tube heat exchanger and capillary tube. The program consists of five modules, condenser, evaporator, compressor, capillary tube simulation modules and properties modules of refrigerant and moist air, The present program is focused on R22 only, however can be easily extended for other refrigerants such as R407C and R410A just by adding property modules. The compressor simulation module utilizes performance maps supplied by manufacturers-map-based model. The condenser and evaporator simulation modules are modeled using tube-by-tube method. Simulation results(capacity and power consumption) were compared with calorimeter test results of actual air-conditioners of window and split types, where more than 82% of the data lied within ${\pm}5$% of the predicted results.
휜-관 열교환기에 있어서 각종 휜 형상의 성능 특성에 관한 실험적 연구
윤백,김영생,박환영,박현연,Yoon, Baek,Kim, Young-Saeng,Park, Hwan-Young,Park, Hyun-Yeon 대한설비공학회 1999 설비공학 논문집 Vol.11 No.4
Air side heat transfer and pressure drop for ø9.52 fin-tube heat exchanger with various types of slit and louver fins were measured, and compared with wave-slit fin. Longitudinal and transverse tube spacings of the heat exchangers are 21.65mm and 25mm respectively. Actual heat exchanger was tested using water, and the tests were performed for 2 row heat exchangers with 3 different fin spacings, 1.3, 1.5 and 1.7mm. The overall performance of the enhanced fins was evaluated by comparing heat transfer coefficient with respect to fan power.
웨이브 및 웨이브-슬릿 열전달촉진 휜-관 열교환기의 공기측 압력강하 및 열전달 특성에 관한 실험
윤백,길용현,박현연,유국철,김영생,Yoon, Baek,Gil, Yong-Hyun,Park, Hyun-Yeon,Yoo, Guk-Chul,Kim, Young-Saeng 대한설비공학회 1998 설비공학 논문집 Vol.10 No.5
Air side heat transfer and pressure drop for fin-tube heat exchanger with wave and wave-slit fins were measured for various fin spacings and number of tube rows. Outer diameter of the tube including fin collar is 10.07mm, and experiments were done with dry surface condition. Longitudinal and transverse tube spacings of the heat exchangers are 21.65mm and 25mm respectively, and wave depth of the wave fin is 2mm. Experiments were conducted for 1, 2 and 3 rows and 3 different fin spacings, 1.3, 1.5 and 1.7mm. An attempt was made to demonstrate advantage of the enhanced fins over the plane fin by introducing the concept of fan power, Effect of the number of tube rows on heat transfer was discussed in connection with general mechanisms of heat transfer enhancement for fin-tube heat exchanger. Also the effect of hydrophilic coating was investigated. Lastly, correlations for Colburn j-factor and friction factor were developed.
알루미늄 다채널 평판관내 R-22 및 R-410A 응축에 관한 연구
정호종,김내현,윤백,김만회,Jung, Ho-Jong,Kim, Nae-Hyun,Yoon, Baek,Kim, Man-Hoi 대한설비공학회 2002 설비공학 논문집 Vol.14 No.7
In this study, condensation heat transfer tests were conducted in flat aluminum multi-channel tubes using R-410A, and the results are compared with those of R-22. Two internal geometries were tested; one with a smooth inner surface and the other with micro-fins. Data are presented for the following range of variables; vapor quality (0.1~0.9), mass flux (200~600 kg/$m^2$s) and heat flux (5~15 ㎾/$m^2$). Results show that the effect of surface tension drainage on the fin surface is more pronounced for R-22 than R-410A. The smaller Weber number for R-22 may be responsible. For the smooth tube, the heat transfer coefficient of R-410A is slightly larger than that of R-22. For the micro-fin tube, however, the reverse is true. Possible reasoning is provided considering the physical properties of the refrigerants. For the smooth tube, a correlation of Akers et at. type predicts the data reasonably well. For the micro-fin tube, the Yang and Webb model was modified to correlate the present data.
조홍기,조금남,윤백,김영생,김정훈,Cho, Hong-Ki,Cho, Geum-Nam,Yoon, Baek,Kim, Young-Saeng,Kim, Jung-Hoon 대한설비공학회 2004 설비공학 논문집 Vol.16 No.9
The present study investigated two-phase flow distribution, phase separation and pressure drop in multi-microchannel tubes under adiabatic condition. The test section consisted of inlet and outlet headers with the inner diameter of 19.4㎜ and 15 parallel microchannel tubes. Each microchannel tube brazed to the inlet and outlet headers and had 8 rectangular ports with the hydraulic diameter of 1.32㎜. The key experimental parameters were orientation of header (horizontal and vertical), flow direction of refrigerant into the inlet header (in-line, parallel and cross flow) and inlet quality (0.1, 0.2 and 0.3). It was found that the orientation of the header had relatively large effect on the flow distribution and phase separation, while the inlet quality didn't affect much on them. The horizontal header showed the better flow distribution and phase separation characteristics than the vertical one. The parallel flow condition with the horizontal header showed the best performance for the flow distribution and phase separation characteristics under the test conditions. Two-phase pressure drops through the microchannel tubes with the horizontal header were higher than those of the microchennel tubes with the vertical header due to gravitational effect.
사인 웨이브 휜-관 열교환기의 공기측 성능에 관한 실험연구
김내현,조진표,윤백,Kim, Nae-Hyun,Cho, Jin-Pyo,Yoon, Baek 대한설비공학회 2004 설비공학 논문집 Vol.16 No.4
The heat transfer and friction characteristics of the heat exchangers having sinusoidal wave fins were experimentally investigated. Twenty-nine samples having different waffle heights (1.5 mm and 2.0 m), fin pitches (1.3mm to 1.7mm) and tube rows (one to three) were tested. Focus was given to the effect of the waffle configuration (herringbone or sinusoidal) on the heat transfer and friction characteristics. Results show that the sinusoidal wave geometry provides higher heat transfer coefficients and friction factors than the herringbone wave geometry, and the difference increases as the number of row increases. The i/f ratios of the herringbone wave geometry, however, are larger than those of the sinusoidal wave geometry. Compared to the herringbone wave geometry, the sinusoidal wave geometry yielded a weak row effect, which suggests a superior heat transfer performance at the fully developed flow region. Possible explanation is provided considering the flow characteristics in wavy channels. Within the present geometric range, the effect of the waffle height on the heat transfer coefficient was not prominent. The effect of the fin pitch was also negligible. Existing correlations highly overpredicted both the heat transfer coefficients and friction factors. A new correlation was developed using the present data.
제습이 수반된 공조용 증발기 습표면의 열전달계수 데이터 리덕션
김내현,오왕규,조진표,박환영,윤백,Kim, Nae-Hyun,Oh, Wang-Kyu,Cho, Jin-Pyo,Park, Hwan-Young,Yoon, Baek 대한설비공학회 2003 설비공학 논문집 Vol.15 No.1
Four different methods of reducing the heat transfer coefficients from experimental data under dehumidifying conditions are compared. The four methods consist of two different heat and mass transfer models and two different fin efficiency models. Data are obtained from two heat exchanger samples having plain fins or wave fins. Comparison of the data with the reduction methods revealed that the single potential heat and mass transfer model yielded the humidity independent heat transfer coefficients. Two different fin efficiency models - enthalpy model and humidity model - yielded approximately the same fin efficiencies and accordingly approximately the same heat transfer coefficients. The heat transfer coefficients under wet conditions were approximately the same as those of the dry conditions for the plain fin configuration. For the wave fin configuration, however, wet surface heat transfer coefficients were approximately 12% higher. The pressure drops of the wet surface were 10% to 45% larger than those of the dry surface.
주름진 필터의 형상변수 및 투과율에 따른 압력강하에 대한 실험적 연구
윤원경(Won Kyong Yoon),김관택(Gwan Taek Kim),윤백(Baek Youn),김현정(Hyun Jung Kim) 대한설비공학회 2021 대한설비공학회 학술발표대회논문집 Vol.2021 No.6
최근 대기오염으로 인해 공기정화 시장이 확대되며 공기청정기 사용률이 증가하고 있다. 공기청정기는 보편적으로 집진 효율이 100%에 달하는 필터를 사용하기 때문에 풍량이 곧 공기청정기의 성능을 나타내는 지표인 분진청정화 능력이 된다. 일반적으로 필터의 집진효율이 증가하면 투과율은 감소하기 때문에 압력강하가 증가하여 풍량이 감소하게 된다. 이에 따라 공기청정기의 성능 확보를 위해서는 필터의 압력강하 특성을 정확하게 파악할 필요가 있다. 필터는 투과면적을 증가시키기 위해 주름진 형상으로 만들어지는데, 주름진 필터에서는 다공성 매질인 필터를 통과하며 생성되는 압력강하와 주름 형상에 의해 생성되는 압력강하가 복합적으로 발생한다. 이러한 영향을 분석하기 위해 본 연구에서는 서로 다른 투과율을 갖는 H-10, H-11, H-13 급의 세 가지 필터를 사용하여 다양한 주름 간격, 주름 깊이를 갖는 필터에 대한 압력강하를 측정하였다. 또한, 특성변수들을 이용하여 상관식을 도출하였으며 본 연구의 결과는 향후 공기청정기의 집진필터를 설계하는데 유용한 데이터로 활용될 것으로 사료된다.