• Title/Summary/Keyword: PEMFC

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Thermal Management Study of PEMFC for Residential Power Generation (가정용 연료전지 시스템의 열관리 해석)

  • Yu, Sang-Seok;Lee, Young-Duk;Ahn, Kook-Young
    • Proceedings of the KSME Conference
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    • pp.2839-2844
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    • 2008
  • A PEMFC(proton exchange membrane fuel cell) is a good candidate for residential power generation to be cope with the shortage of fossil fuel and green house gas emission. The attractive benefit of the PEMFC is to produce electric power as well as hot water for home usage. Typically, thermal management of vehicular PEMFC is to reject the heat from the PEMFC to the ambient air. Different from that, the thermal management of PEMFC for RPG is to utilize the heat of PEMFC so that the PEMFC can be operated at its optimal efficiency. In this study, dynamic thermal management system is modeled to understand the response of the thermal management system during dynamic operation. The thermal management system of PEMFC for RPGFC is composed of two cooling circuits, one for controling the fuel cell temperature and the other for heating up the water for home usage. Dynamic responses and operating strategies of the PEMFC system are investigated during load changes.

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An Experimental Study on the Performance of PEMFC Stack Depending on Operating Conditions (운전조건에 따른 PEMFC 스택의 성능에 관한 실험적 연구)

  • Lee, Ji-Hong;Lee, Myeong-Yong;Lee, Sang-Seok;Nam, Il-Sang;Lee, Do-Hyung
    • Journal of Advanced Marine Engineering and Technology
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    • v.33 no.5
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    • pp.770-777
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    • 2009
  • The energy depletion and the environmental pollution like global warming are worldwide issues. For correcting these problems there are many studies on new-renewable energy in Korea. A kind of new-renewable energy, PEMFC(Proton Exchange Membrane Fuel Cell) is a low temperature fuell cell and there are some cases of small craft or submarine adopted PEMFC system in maritime. PEMFC's performance is affected the operating conditions. Finding optimum operating conditions must be performed before adopting PEMFC to system. So in this study, we experiment about various operating conditions to apply 150W PEMFC stack for a model boat. And through the results, we find optimum operating conditions and study an effect of operating conditions to PEMFC.

Performance Degradation of Dead-end Type PEMFC by Startup and Shutdown Cycles (시동/정지 반복에 의한 데드엔드형 고분자전해질 연료전지의 성능 감소)

  • Jeong, Jaehyeun;Jeong, Jaejin;Song, Myunghyun;Chung, Hoibum;Na, Ilchai;Lee, Ho;Park, Kwonpil
    • Korean Chemical Engineering Research
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    • v.51 no.5
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    • pp.540-544
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    • 2013
  • During start up and shut down of a proton exchange membrane fuel cells (PEMFC), the performance and lifetime of PEMFC were reduced. In this study, effect of startup and shutdown were investigated in dead-end type PEMFC using oxygen as a cathode gas with polarization curve, impedance spectroscopy (EIS), scanning electron microscopy (SEM) and transmission electron microscopy (TEM). Dummy load which eliminates residual hydrogen and oxygen during startup and shutdown operation should be applied to mitigated the degradation of PEMFC performance. At 50% relative humidity (RH) under the repetitive on/off cycling, the cell performance decayed faster than at 100% RH because of corrosion of the cathode carbon support. Water suppling into cell reduced the degradation rate of dead-end type PEMFC during start up and shut down cycling at 50% RH.

A Study of the Effect of Compressor Performance Map on the Efficiency of High-pressure Operating PEMFC Systems in Automotive Applications (압축기 성능 맵이 자동차용 가압형 고분자전해질형 연료전지 시스템 효율에 미치는 영향 연구)

  • Cho, Donghoon;Kim, Han-Sang
    • Transactions of the Korean hydrogen and new energy society
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    • v.23 no.6
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    • pp.604-611
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    • 2012
  • For the commercialization of fuel cell powered vehicle, it is highly important to improve the performance and efficiency of an automotive polymer electrolyte membrane fuel cell (PEMFC) system. The performance and efficiency of PEMFC systems are significantly influenced by their operating conditions. Among these conditions, the system operating pressure is considered as the one of the main factors. In this study, to investigate the effects of operating pressure on the performance and efficiency of automotive PEMFC systems, two types of high-pressure operating PEMFC systems adopting two different compressors (i. e. different performance maps) are modeled by using MATLAB/Simulink environment. The PEMFC system efficiency and parasitic compressor power are mainly analyzed and compared for the two types of high-pressure operating PEMFC systems under the same system net power conditions. It is expected that this kind of study can contribute to provide basic insight into the operating strategies of high-pressure operating PEMFC systems for automotive use.

Investigation of Equivalent Circuit for PEMFC Assessment (고분자 전해질 FC 평가용 등가회로 검토)

  • Myong, Kwang-Jae
    • Transactions of the Korean Society of Mechanical Engineers B
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    • v.35 no.9
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    • pp.897-902
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    • 2011
  • Chemical reactions occurring in a PEMFC are dominated by the physical conditions and interface properties, and the reactions are expressed in terms of impedance. The performance of a PEMFC can be simply diagnosed by examining the impedance because impedance characteristics can be expressed by an equivalent electrical circuit. In this study, the characteristics of a PEMFC are assessed using the AC impedance and various equivalent circuits such as a simple equivalent circuit, equivalent circuit with a CPE, equivalent circuit with two RCs, and equivalent circuit with two CPEs. It was found in this study that the characteristics of a PEMFC could be assessed using impedance and an equivalent circuit, and the accuracy was highest for an equivalent circuit with two CPEs.

A Study on the Analysis of the Performance and Efficiency of a Low-pressure Operating PEMFC System for Vehicle Applications Using MATLAB/Simulink (MATLAB/Simulink를 이용한 자동차용 상압형 PEM 연료전지 시스템의 성능 및 효율 분석 연구)

  • Park, Raehyeok;Kim, Han-Sang
    • Transactions of the Korean hydrogen and new energy society
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    • v.24 no.5
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    • pp.393-400
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    • 2013
  • The air supply system has a significant effect on the efficiency of polymer electrolyte membrane fuel cell (PEMFC) systems. The performance and efficiency of automotive PEMFC systems are greatly influenced by their air supply system configurations. This study deals with the system simulation of automotive PEMFC systems using MATLAB/Simulink framework. In this study, a low-pressure operating PEMFC system adopting blower sub-module (turbo-blower) is modeled to investigate the effects of stack operating temperature and air stoichiometry on the parasitic power and efficiency of automotive PEMFC systems. In addition, the PEMFC net system efficiency and parasitic power of air supply system are mainly compared for the two types (low-pressure operating and high-pressure operating) of automotive PEMFC systems under the same net power conditions. It is suggested that the obtained results from this system approach can be applied for establishing the novel operating strategies for FC vehicles.

A Study on the Comparison of the Stand-alone operation Characteristics and Matlab/Simulink Dynamic Model of PEMFC and PEMFC/SCB (고분자전해질 연료전지(PEMFC)와 PEMFC/SCB의 동적 Matlab/Simulink 모델링 및 독립운전특성에 관한 연구)

  • Hong, Pyo-Won;Cho, Jae-Hoon
    • Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
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    • v.25 no.2
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    • pp.53-60
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    • 2011
  • The available power generated from the FC power plant may not be sufficient to meet sustained load demand, peak demand or transient events. An supercapacitor bank(SCB) can supply a large burst of power, but it cannot store a significant amount of energy. The combined use of FC and SCB has the potential for the better energy efficiency, reducing the cost of FC technology and improved dynamic response. In this paper, A single PEMFC and PEMFC operated in parallel with a SC bank are presented, A new dynamic model of PEMFC system, the converter and controller has been developed for stand-alone applications. The simulation results are presented using Matlab/Simulink, and SimPowerSystems environments. It is confirmed that the results show a good performance and stable DC-link voltage for proposed dynamic and mathematical models developed for the combined FC/SCB.

Influence of the inlet oxygen humidity on PEMFC performance (산소 가습이 PEMFC 성능에 미치는 영향)

  • Lee, Seo-Hee;Moon, Cheor-Eon;Ko, Dong-Soo;Choi, Gyung-Min;Kim, Duck-Jool;Jung, Ji-Hwan
    • 한국신재생에너지학회:학술대회논문집
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    • pp.35-38
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    • 2007
  • The comparisons between measured performance of lab-scale PEMFC and calculation were conducted to understand the detail phenomena of PEMFC for the various inlet oxygen humidity of cathode side. Experiments were performed at $65^{\circ}C$ operation temperature and different inlet humidity conditions such as 40%, 60% and 80%. We used the MEA manufactured by oneself which include $Nafion^{(R)}$ 112 membrane, Nafion solution 20%, and carbon paper(E-TEK). As a result of this experiment, cell performance was getting higher by increasing inlet humidity condition at cathode side because ion conductivity of electrolyte membrane is increased. A 3D CFD simulation model of PEMFC was developed using commercially available CFD code that is one of the STAR-CD module, es-pemfc under same operating conditions. Model calculations results were compared with experimental ones on the polarization curves and calculation results are in good agreement with the experimental ones. Local water distribution and current density inside PEMFC are discussed in detail.

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Comparative Performance Analysis of Hybrid PEM Fuel Cell Hybrid Systems (하이브리드 PEM 연료전지 시스템의 성능 비교해석)

  • You, Byung-June;Kim, Tong-Seop;Lee, Young-Duk;Ahn, Kook-Young
    • Proceedings of the KSME Conference
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    • pp.3230-3235
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    • 2007
  • Design performances of various configurations of the PEMFC/GT hybrid systems have been evaluated. Based on PEMFC adopting steam reforming, various system configurations (one ambient pressure configuration and three different pressurized configurations) were designed and their performances were compared. Their Performances are also compared with the reference PEMFC system. Influences of turbine inlet temperature, pressure ratio on the hybrid systems performance were investigated and design ranges exhibits better efficiency than the PEMFC system were presented. One of the pressurized system may have much higher efficiency than the PEMFC system, while other systems hardly provide efficiency upgrade.

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Observation of local water content and current density in the PEMFC system (고분자 전해질 연료전지의 전류밀도와 국소 함수량 관찰)

  • Ko, Dong-Soo;Moon, Cheor-Ron;Choi, Gyung-Min;Kim, Duck-Jool;Jung, Ji-Hwan
    • 한국신재생에너지학회:학술대회논문집
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    • pp.69-72
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    • 2008
  • The local water contents and water transfer characteristics in the PEMFC system were investigated by numerical simulations and experiments. The performance of a lab-scale PEMFC is measured for fully humidified gases conditions and non-humidified ones. In order to observe the local water contents and water transfer characteristics inside PEMFC, the numerical simulation using CFD module on STAR-CD(es-pemfc) were conducted. The results show that the water content was increased as increasing current density, whereas it was decreased in high current density region. Then there was close correlation between high water content and internal temperature inside of MEA, and high current density was observed when internal temperature was dramatically increased.

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