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홍경한,김재열,김병철,하옥남,전상신,이승재,박찬수,권일욱 한국생산제조학회 2004 한국생산제조학회지 Vol.13 No.4
Fin-tube type(Fin-type) heat exchanger has been tested in order to replace the heat exchanger of parallel flow type(P.F-type) which is now widly used in automobile air conditioning system. The following conclusions are drawn by the comparison of the characteristics of the heat exchangers. Evaporator and condenser capacities and COP(Coefficience of performance) were varied as with the compressor speed, outdoor air temperature and air flow rate changed, which much influenced on the characteristics of the air conditioning system. Evaporator and condenser capacities were increased with increasing compressor speed and outdoor air temperature. Evaporator and condenser pressures of Fin-type were decreased by 7% and 5% respectively compared with those of P.F-type. The COP of Fin-type was decreased with increasing outdoor air temperature and compressor speed. The COP of P.F-type was decreased by 14% compared with that of Fin-type.
홍경한,고도경,최일우,이종민,노영철,Sergei Kostritsa,성재희,유태준 한국물리학회 2006 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.49 No.1
We report on the development of a GW-class femtosecond Ti:sapphire laser operating at the repetition rate of 100 kHz using downchirped pulse amplification (DPA) technique. A regenerative amplifier, acousto-optically switched and pumped by a 100-kHz Q-switched green laser, allows the high-energy amplification with a high repetition rate. The DPA-based dispersion compensation has helped us obtain 28 μJ, 39 fs laser pulses with a compression efficiency as high as 95 %. Temporal and spatial characterization of the pulses is presented.
蓄熱用 TMA 包接化合物의 熱物性에 關한 實驗硏究(II)
홍경한,한영옥,하옥남,김진흥 조선대학교 에너지.자원신기술연구소 1997 에너지·자원신기술연구소 논문지 Vol.19 No.2
This paper presents the test-tube experimental results of thermal properties of TMA clathrate compounds for latent heat storage applications. The results are ; TMA 25wt% clathrate compounds among the clathrate for various concentration, was found to have the most superior thermal property and when the heat source was -5℃, regarding the COP of refrigerator, 1) Phase change temperature was 5.3%. 2) Subcooling was 6.3℃. The subcooling of TMA clathrate decreased according to the temperature of decreasing heat source 3) Specific heat was 4.5kJ/kgK. 4) The latent heat of TMA 25wt% clathrate was the maximum 252.8kJ/kg. As subcooling can be lowered to 0.3℃, when the heat source is -15℃, continual study is needed to reduce the subcooling.
핀형 열교환기를 적용한 자동차용 공조시스템의 성능특성에 관한 연구
홍경한,하옥남 조선대학교 에너지.자원신기술연구소 2003 에너지·자원신기술연구소 논문지 Vol.25 No.2
Fin-type heat exchanger has been tested in order to replace the heat exchanger of P.F-type which is now used in automobile air conditioner system. The comparative characteristics performance test and data analysis showed the following conclusion. Evaporator and condenser capacities and COP changed as the compressor speed, outdoor air temperature and air rate changed, which much influenced the air conditioner system. COP decreased as the outdoor air temperature goes up and compressor speed increases and the COP of Fin-type increased by 14% compared which taht of P.F-type. Comparative experiment showed that the Fin-type proved to be better than the P.F-type in overall performance. It is concluded that Fin-type is more efficient in terms of energy saving and engine power enhancement. The Fin-type is expected to be more favorable in near future.