http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
Synthetic Jet Air Blower를 이용한 Free Breathing 연료전지의 성능 평가
최종필(JongPil Choi),구보성(BoSung Ku),장재혁(JaeHyuk Jang),서영호(YoungHo Seo),김병희(ByeongHee Kim) 대한기계학회 2008 대한기계학회 춘추학술대회 Vol.2008 No.11
An free breathing proton exchange membrane fuel cell (PEMFC) was developed. This paper presents a study of the several effect on the performance of a fuel cell such as air flow rate, opening ratio, and cathode structures. Especially, an air flow rate is critical condition to improve the fuel cell performance. In this paper, we developed a synthetic jet micro air blower to supply high stoichiometric air. The synthetic jet actuation is usually generated by a traditional PZT-driven actuator, which consists of a small cylindrical cavity, orifices and PZT diaphragms. In comparison with free convection fuel cells, the forced-convection fuel cell which equipped synthetic jet micro air blower brings higher performance and stability for long term test. Also, power consumption of the synthetic jet micro air blower is under 0.3W. The results show that the maximum power density was 188㎽/㎠ at 400㎃/cm2.The maximum power density was higher 40% than power density of free convection fuel cell.
최종필(J. P. Choi),김광수(K. S. Kim),서영호(Y. H. Seo),구보성(B. S. Ku),장재혁(J. H. Jang),김병희(B. H. Kim) 한국소성·가공학회 2008 소성가공 : 한국소성가공학회지 Vol.17 No.8
This paper presents a micro air pump based on the synthetic jet to supply reactant at the cathode side for micro fuel cells. The synthetic jet is a zero mass flux device that converts electrical energy into the momentum. The synthetic jet actuation is usually generated by a traditional PZT-driven actuator, which consists of a small cylindrical cavity, orifices and PZT diaphragms. Therefore, it is very important that the design parameters are optimized because of the simple configuration. To design the synthetic jet micro air pump, a numerical analysis has been conducted for flow characteristics with respect to various geometries. From results of numerical analysis, the micro air pump has been fabricated by the PDMS replication process. The most important design factors of the micro air pump in micro fuel cells are the small size and low power consumption. To satisfy the design targets, we used SP4423 micro chip that is high voltage output DC-AC converter to control the PZT. The SP4423 micro chips can operate from 2.2~6V power supply(or battery) and is capable of supplying up to 200V signals. So it is possible to make small size controller and low power consumption under 0.1W. The size of micro air pump was 16 × 13 × 3 mm3 and the performance test was conducted. With a voltage of 3V at 800Hz, the air pump’s flow rate was 2.4cc/min and its power consumption was only 0.15W.
고온형 멤브레인을 사용한 메탄올 개질 연료전지의 개질기 일체형 평판 설계
김성한(Kim, Sung-Han),장재혁(Jang, Jae-Hyuk),길재형(Gil, Jae-Hyoung),이홍렬(Lee, Hong-Ryul),차혜연(Cha, Hye-Yeon),구보성(Ku, Bo-Sung),정창렬(Jung, Chang-Ryul),쿤두(Kundu, Arunaha),미씨(Miesse, Craig),오용수(Oh, Yong-Soo) 한국신재생에너지학회 2006 한국신재생에너지학회 학술대회논문집 Vol.2006 No.11
For a mobile application such as cellular phone, micro fuel cells should be extremely compact and thin. RHFC can be an alternative solution because RHFC gives higher power density than DMFC and does not need ahydrogen storage vessel In this paper, RHFC using methanol fuel is made as a novel planar design without a PROX. Both reformer and cell are made closely in a same plate to share the heater of reformer with the cell. The PBI membrane is used in the cell. The reason is that high temperature of reformer can cause a performance drop when perfluorosulfonic acid membrane such as Nafion is used such a high temperature operation also guarantees the higher CO tolerance to MEA catalyst. The cell is designed as an air-breathing type which the cathode of the cell is opened to the air. The commercial Cu/ZnO/Al2O3 steam reformer catalyst is packed in reformer channel. The active area of MEA is 11.9cm² and the peak power density was 27.5mW/cm².
Synthetic jet을 이용한 마이크로 에어펌프의 개발
김광수,최종필,구보성,장재혁,서영호,김병희 한국공작기계학회 2008 한국공작기계학회 춘계학술대회논문집 Vol.2008 No.-
This paper presents a micro air pump actuated by PZT actuator (synthetic jet actuator) for air supply for micro fuel cells. The synthetic jet is a zero mass flux device that converts electrical energy into the momentum. The synthetic jet actuation is usually generated by a traditional PZT-driven actuator, which consists of a small cylindrical cavity, in/outlet channel and PZT diaphragms. To design the synthetic jet micro air pump , a numerical analysis has been conducted for flow characteristics with respect to various geometries. Form the results of numerical analysis, the micro air pump has been fabricated by the PDMS replication process. The most important design factors of the micro air pump in micro fuel cells are the small size and low power consumption. To satisfy the design targets, we used SP4423 micro chip that is high voltage output DC-AC converter to control the PZT. The SP4423 micro chips can operate from 2.2~6V power supply (or battery ) and is capable of supplying up to 200V signals. So it is possible to make small size controller and low power consumption under 0.1W. The micro air pump's size was 16mm × 14mm × 3 mm and was conducted performance test. With a voltage of 3V at 100Hz, the air pump's pumping pressure is 600pa and its power consumption is only 0.1W.