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황재순(Jaesoon Hwang),허형석(Hyungseok Heo),배석정(Sukjung Bae),이동혁(Donghyuk Lee),최해성(Haeseong Choi),김영삼(Youngsam Kim) 한국자동차공학회 2010 한국자동차공학회 학술대회 및 전시회 Vol.2010 No.11
Recently, works on compact heat exchangers have sparked interest amongst heat exchanger manufacturers to develop the compact heat exchangers with enhanced thermal performance in comparison to conventional ones. The purpose of this study is to design more efficient fin than commonly used louvered fin on the basis of same core size. Cooling capacity of louvered fin of conventional radiator is numerically analyzed and the performance is compared with that of the designed fin. Simulations were performed for different louver pitches with 0.9, 1.4 ㎜. In conclusion, cooling capacity of designed fin with 0.9 ㎜ louver pitch is increased more than 7% compared with the conventional fin even though the air side pressure drop increased.
루버휜-관 열교환기 형상변화에 따른 응축특성에 관한 연구
김명회(Myunghoe Kim),김해룡(Haeryong Kim),나원균(Weonkyun Na) 한국자동차공학회 2004 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
Experiments are carried out to investigate the heat transfer rate and pressure drop characteristics of the modified fin-tube heat exchanger having same flow path as the two row louver fin-tube heat exchanger using refrigerant R22. The heat exchangers used in the experiments are classified as two, one is fundamental type and the other is combination type of two-row heat exchanger which is consist of two one-row heat exchanger with intervals of 14 ㎜. According to the results, the combination type heat exchanger has higher outlet air temperature and condensation heat transfer rate than the fundamental type heat exchanger. However, The combination type heat exchanger has higher air pressure drop than the fundamental type. The combination type has also higher refrigerant pressure drop than the fundamental type.
저 착상 휜과 두 대 압축기 사이클을 이용한 히트펌프 난방성능 개선에 관한 연구
황윤제,조은준,정백영,이감규 대한설비공학회 2005 설비공학 논문집 Vol.17 No.3
This study presents the experimental study on improvement of frost/defrost performance in an heat pump system with newly developed fin and multiple compressors. As multiple compressors system, the variable and single speed compressor combinations has been introduced and compared with single speed 1-compressor system in a view point of improvement of frost/defrost performance. Also, newly developed corrugate shaped fin has been compared with conventional louver shaped fin. The frost/defrost performance is defined and some parameters are compared to discuss the effect of each combination. From this experimental study, it is known that if the variable and single speed compressor combination system equipped with corrugate shaped fin, the system performance has greatly improved not only for heating capacity, but also for frost performance.
유기정(Kijung Ryu),이관수(Kwan-Soo Lee) 대한설비공학회 2013 설비공학 논문집 Vol.25 No.12
This paper presents a numerical optimization of louvered fins to enhance the JF factor in terms of the design parameters, including the fin pitch, the number of louvers, the louver angle, the fin thickness, and the re-direction louver length. We carried out a parametric study to select the three most important parameters affecting the JF factor, which were the fin pitch, number of louvers, and the louver angle. We optimally designed the louvered fin by using 3rd-order full factorial design, the kriging method, and a micro genetic algorithm. Consequently, the JF factor of the optimum model increased by 16% compared to that of the base model. Moreover, the optimum model reduced the pressure drop by 17% with a comparable heat transfer rate.
김도영(Do-Young Kim),함정호(Jung-Ho Ham),김내현(Nae-Hyun Kim),박래현(Rae-Hyun Park),황준현(Jun-Hyun Hwang) 대한기계학회 2007 대한기계학회 춘추학술대회 Vol.2007 No.10
The effect of inclination angle on the heat transfer and pressure drop characteristics of brazed aluminum heat exchangers is experimentally investigated. Three samples having different fin pitches (1.25, 1.5 and 2.0㎜) were tested. Results show that heat transfer coefficient is not affected by the inclination angle. However, the friction factor increases as the inclination angle increases with negligible difference between the forward and backward inclination. Both the heat transfer coefficient and the friction factor are the smallest at P<SUB>f</SUB>=1.5㎜, followed by P<SUB>r</SUB>=2.0㎜ and 1.25㎜. Possible explanation is provided considering the louver layout Comparison with existing correlations is also made.