• 제목/요약/키워드: PEMFC

검색결과 911건 처리시간 0.027초

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

  • 유상석;이영덕;안국영
    • 대한기계학회:학술대회논문집
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    • 대한기계학회 2008년도 추계학술대회B
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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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운전조건에 따른 PEMFC 스택의 성능에 관한 실험적 연구 (An Experimental Study on the Performance of PEMFC Stack Depending on Operating Conditions)

  • 이지홍;이명용;이상석;남일상;이도형
    • Journal of Advanced Marine Engineering and Technology
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    • 제33권5호
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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.

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

  • 정재현;정재진;송명현;정회범;나일채;이호;박권필
    • Korean Chemical Engineering Research
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    • 제51권5호
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    • pp.540-544
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    • 2013
  • 고분자전해질연료전지(PEMFC)는 시동/정지과정에서 성능과 수명이 감소한다. 본 연구에서는 캐소드가스로 산소를 사용하는 데드엔드 형 PEMFC의 시동/정지 과정의 영향을 분극곡선, 임피던스(EIS), SEM과 TEM을 사용해 연구하였다. 시동/정지 과정에서 PEMFC 성능감소를 막기 위해서는 더미 로드를 사용해야 함을 보였다. 시동/정지 반복과정 중 50% 상대습도(RH)에서 캐소드 카본지지체의 부식에 의한 열화가 100% RH보다 심했다. 데드엔드 형 PEMFC의 정지과정에서 PEMFC에 물을 공급해줌으로써 50% RH에서 열화속도를 감소시켰다.

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

  • 조동훈;김한상
    • 한국수소및신에너지학회논문집
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    • 제23권6호
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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.

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

  • 박래혁;김한상
    • 한국수소및신에너지학회논문집
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    • 제24권5호
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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.

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

  • 명광재
    • 대한기계학회논문집B
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    • 제35권9호
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    • pp.897-902
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    • 2011
  • PEMFC 의 내부에서 발생하는 화학반응은 계면의 물리적 조건 및 물성에 지배되고 그 거동은 임피던스로 표현된다. 일반적으로 임피던스 특성은 전기적 등가회로로 표현이 가능하기 때문에 PEMFC의 임피던스 계측 결과를 등가회로를 이용하여 해석함으로써 간단히 성능 진단을 할 수 있을 것이다. 본 연구에서는 이러한 등가회로를 이용하여 고분자 전해질 연료전지의 특성평가에 관한 기초연구를 수행하였다. 교류 임피던스 계측 값과 다양한 등가회로(단순 등가회로, CPE 를 고려한 등가회로, 2 개의 시정수를 고려한 등가회로, 2 개의 CPE 를 고려한 등가회로)를 이용하여 특성평가를 수행하였다. 그 결과 등가회로를 이용한 PEMFC 의 특성평가가 가능하고, 2 개의 CPE 를 고려한 등가회로가 가장 정도가 높음을 확인하였다.

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

  • 홍원표;조재훈
    • 조명전기설비학회논문지
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    • 제25권2호
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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.

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

  • 이서희;문철언;고동수;최경민;김덕줄;정지환
    • 한국신재생에너지학회:학술대회논문집
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    • 한국신재생에너지학회 2007년도 추계학술대회 논문집
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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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하이브리드 PEM 연료전지 시스템의 성능 비교해석 (Comparative Performance Analysis of Hybrid PEM Fuel Cell Hybrid Systems)

  • 유병준;김동섭;이영덕;안국영
    • 대한기계학회:학술대회논문집
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    • 대한기계학회 2007년도 춘계학술대회B
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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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고분자 전해질 연료전지의 전류밀도와 국소 함수량 관찰 (Observation of local water content and current density in the PEMFC system)

  • 고동수;문철언;최경민;김덕줄;정지환
    • 한국신재생에너지학회:학술대회논문집
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    • 한국신재생에너지학회 2008년도 춘계학술대회 논문집
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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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