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공기 유량 변화에 따른 이온교환막 연료전지용막 가습기의 동특성응답
배호준(Hojune Bae),김용모(Yongmo Kim),유상석(Sangseok Yu),안국영(kookyoung Ahn),이영덕(Youngduk Lee) 대한기계학회 2009 대한기계학회 춘추학술대회 Vol.2009 No.11
The efficiency and life time of the proton exchange membrane (PEM) fuel cell system is critically changed with its humidity which should be maintained properly during dynamic operation. Membrane humidifier is used for the water management of the PEMFC due to its reliable performance and the feature of zero parasitic power loss. In the PEMFC system, membrane humidifier is required to regulate proper humidity level for the design point of the fuel cell. During transient operation of the PEMFC system, it is difficult to control the humidity of the PEMFC system properly. However, few literatures are reported for the dynamic response of the membrane humidifier even though it is very important for durability of the system. In this study, we presented the performance variation of the membrane humidifier during transient conditions. Dry air pressure, water flow temperature, and air flow rate were chosen as the operating parameters. Results shows that time constant for dynamic response of membrane humidifier is small enough. Flow rate and differential pressure between dry air and water are important factor in the performance of membrane humidifier.
이온교환막 연료전지용 막 가습기의 운전 조건에 따른 성능 실험
배호준(Bae, Ho-June),김용모(Kim, Yong-Mo),이영덕(Lee, Young-Duk),유상석(Yu, Sang-Seok) 한국신재생에너지학회 2008 한국신재생에너지학회 학술대회논문집 Vol.2008 No.10
The efficiency and life time of the proton exchange membrane (PEM) fuel cell system is critically changed with its humidity which should be maintained properly during dynamic operation. Membrane humidifier is required to regulate proper humidity level for the design point of the PEMFC system. In this study, we presented the performance of the cylindrical membrane humidifier which is operated as water-to-gas. Dry air pressure, liquid water flow temperature, and air flow rate were chosen as the operating parameters. Humidity level is expressed with dew point.
이온교환막 연료전지용 원통형 막 가습기의 열 및 물질전달특성 기초 연구
배호준(Hojune Bae),안국영(Kook Young Ahn),이영덕(Young Duk Lee),강상규(Sang Kyu Kang),유상석(Sangseok Yu) 대한기계학회 2011 大韓機械學會論文集B Vol.35 No.5
막 가습기는 다른 가습장치와는 달리, 기생 전력의 손실이 없고 가습 성능이 우수하여 이온교환막 연료전지의 외부 가습을 위해 적용되고 있다. 원통형 막 가습기는 특히 가습성능에 비해 요구 체적이 매우 작기 때문에, 수송용 및 가정용 이온교환막 연료전지에 적용된다. 막가습기의 최적 설계를 위한 열 및 물질 전달 특성에 대한 이해가 필요하지만, 아직 다양한 연구가 이루어지고 있지 않다. 본 연구에서는 원통형 막가습기의 열 및 물질 전달 특성을 이해하기 위한 특성 실험을 수행하였다. 기존의 습도 측정계는 비정상 가습 특성 실험에 한계가 있고, 정상 상태에서도 고온 다습한 환경에서는 오차가 크기 때문에 본 연구에서는 습증기 응축법을 이용하였다. 가습기의 정상상태 특성을 확인하기 위해 압력과 온도 변화에 대한 실험을 수행하였으며, 비정상 특성을 확인하기 위해 순간 유량 변화 시의 가습 성능을 측정하였다. 본 연구에서는 이상의 기초 실험을 통해서 막 가습기의 성능에 영향을 미치는 주요 인자를 확인하였으며, 원통형 막가습기의 기초적인 열 및 물질 전달 특성을 이해하였다. The proton exchange membrane (PEM) fuel cell system is critically dependent on the humidity, which should be properly maintained over the entire operating range. A membrane humidifier is used for the water management in the PEMFC because of the membrane humidifier’s reliable performance and zero parasitic power loss. In the PEMFC system, the membrane humidifier is required to provide appropriate humidity for the design point of the fuel cell. Although the performance of the fuel cell depends on the performance of the humidifier, few studies have provided a systematic analysis of the humidifier. We carry out an experimental analysis of the membrane humidifier using a vapor condensation bottle. The dry air pressure, water flow temperature, and air flow rate were chosen as the operating parameters. The results show that the time constant for the dynamic response of the membrane humidifier is relatively short, but additional analysis should be carried out.
Energy Star 기준에 따른 Omnidirectional LED 벌브의 전기적 광학적 특성 분석
김유신,배호준,김기훈,김현식,송상빈,Kim, Yu-Sin,Bae, Ho-June,Kim, Gi-Hoon,Kim, Hyun-Sik,Song, Sang-Bin 한국전기전자재료학회 2012 전기전자재료학회논문지 Vol.25 No.9
An LED (light emitting diode) has the advantages of lower power consumption, energy saving, high efficiency, long lifetime, and environmental friendliness so that it has been getting the spotlight as a next-generation light source. Thus, the application range of an LED has been extended to various fields including indoor and outdoor lighting. Recently, the high efficient LED lighting has been developed, an LED has been extended its market rapidly every year and is expected to replace the general light source within near future. In this study were measured electrical and optical properties for 6 types of LED bulbs which are being developed to replace the general incandescent lamps, and were analysed under the standard of the omnidirectional lamp required by the Energy Star.