• 제목/요약/키워드: PEM (Polymer electrolyte membrane) Fuel cell

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고분자 전해질 연료전지용 막가습기의 상대습도 추정을 위한 소프트센서 개발 (Soft Sensor Development for Predicting the Relative Humidity of a Membrane Humidifier for PEM Fuel Cells)

  • 한인수;신현길
    • 한국수소및신에너지학회논문집
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    • v.25 no.5
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    • pp.491-499
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    • 2014
  • It is important to accurately measure and control the relative humidity of humidified gas entering a PEM (polymer electrolyte membrane) fuel cell stack because the level of humidification strongly affects the performance and durability of the stack. Humidity measurement devices can be used to directly measure the relative humidity, but they cost much to be equipped and occupy spaces in a fuel cell system. We present soft sensors for predicting the relative humidity without actual humidity measuring devices. By combining FIR (finite impulse response) model with PLS (partial least square) and SVM (support vector machine) regression models, DPLS (dynamic PLS) and DSVM (dynamic SVM) soft sensors were developed to correctly estimate the relative humidity of humidified gases exiting a planar-type membrane humidifier. The DSVM soft sensor showed a better prediction performance than the DPLS one because it is able to capture nonlinear correlations between the relative humidity and the input data of the soft sensors. Without actual humidity sensors, the soft sensors presented in this work can be used to monitor and control the humidity in operation of PEM fuel cell systems.

연료전지 냉각판의 냉각 특성에 대한 수치해석적 연구 (Numerical Simulation on Cooling Plates in a Fuel Cell)

  • 김윤호;이용택;이규정;김용찬;최종민;고장면
    • 설비공학논문집
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    • v.19 no.1
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    • pp.86-93
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    • 2007
  • The PEM (polymer electrolyte membrane) fuel cell is one of the promising fuel cell systems as a new small power generating device for automobiles and buildings. The optimal design of cooling plates installed between MEA (membrane electrode assembly) is very important to achieve high performance and reliability of the PEMFC because it is very sensitive to temperature variations. In this study, six types of cooling plate models for the PEMFC including basic serpentine and parallel shapes were designed and their cooling performances were analyzed by using three-dimensional fluid dynamics with commercial software. The model 3 designed by revising the basic serpentine model represented the best cooling performance among them in the aspect of uniformity of temperature distribution and thermal reliability, The serpentine models showed higher pressure drop than the parallel models due to a higher flow rate.

고분자 전해질 연료전지용 분리판 최적 설계 (Optimal Design of Bipolar-Plates for a PEM Fuel Cell)

  • 한인수;정지훈;임종구;임찬;정광섭
    • 한국신재생에너지학회:학술대회논문집
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    • pp.99-102
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    • 2006
  • Optimal flow-field design of bipolar-plates for a commercial class PEM(polymer electrolyte membrane) fuel cell stack was carried out on the basis of three-dimensional computational fluid dynamics(CFD) simulation. A three-dimensional CFD model originally developed by Shimpalee et al., has been utilized for performing large-scale simulation of a single fuel cell consisting of bipolar-plates gas diffusion layers, and a membrane-electrode-assembly(MEA). The CFD model is able to predict the current density, pressure drops, gas velocities, vapor and liquid water contents, temperature distributions, etc. inside a single fuel cell. Depending on simulation results from the CFD modeling of a PEM fuel cell, several flow-fields of bipolar-plates were designed and verified. The final design of the bipolar-plate has been chosen from the simulations and experimental tests and showed the best performance as expected from the simulation results under a normal operating condition. Thus, the CFD simulation approach to design the optimal flow-field of the bipolar-plates was successful. The final design was adopted as the best flow-field to build a commercial scale PEM fuel cell stack, the performance of which shows about 42% higher than that of the older bipolar-plate design.

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일차계 모델을 이용한 고분자전해질 연료전지 스택의 CO Poisoning 및 Air Bleeding 효과 분석 (Analysis of the Effects of CO Poisoning and Air Bleeding on the Performance of a PEM Fuel Cell Stack using First-Order System Model)

  • 한인수;신현길
    • Korean Chemical Engineering Research
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    • v.51 no.3
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    • pp.370-375
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    • 2013
  • 상업용 막전극접합체를 사용하여 제작한 고분자전해질 연료전지의 CO poisoning 및 air bleeding 효과가 스택의 셀전압 성능에 미치는 영향을 분석하였다. 실험을 통해 확보한 동적 응답 데이터에 일차 미분방정식으로 표현되는 일차계 모델을 적용하여 정상상태 이득과 시간상수를 계산하는 방법으로 스택 셀전압의 응답 특성을 정량화하였다. 연료전지 개질기로부터 공급되는 개질 가스에 포함된 CO 농도가 1 ppm 증가할 때마다 셀전압은 1.3~1.6 mV 저하되고, CO 농도의 변화폭이 클수록 정상상태에 도달하기까지 걸리는 시간이 점점 짧아지는 것으로 분석되었다. CO poisoning에 의해 저하된 스택 성능을 회복시키기 위해 air bleeding을 수행할 경우, 주입하는 공기의 농도를 증가시킬수록 셀전압 상승폭(정상상태 이득)이 커지고 회복시간(시간상수)은 짧아지나, 1% 수준의 air bleeding만으로도 CO poisoning이 일어나기 전 셀전압의 87%~96%를 1~30 min 이내에 회복시킬 수 있는 것으로 분석되었다.

PEM 연료전지 시스템 모델링-자동차용 연료전지 시스템의 주요 작동 변수 변경에 따른 시스템 효율 민감도 분석 (Modeling of PEM Fuel Cell System-Sensitivity Analysis of System Efficiency with Different Main Operating Parameters of Automotive Fuel Cell System)

  • 김한상;강병길;원권상
    • 한국수소및신에너지학회논문집
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    • v.30 no.5
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    • pp.401-410
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    • 2019
  • The operating conditions greatly impact the efficiency and performance of polymer electrolyte membrane (PEM) fuel cell systems and must be properly managed to ensure better performance and efficiency. In particular, small variations in operating conditions interact with each other and affect the performance and efficiency of PEM fuel cell systems. Thus, a systematic study is needed to understand how small changes in operating conditions affect the system performance and efficiency. In this paper, an automotive fuel cell system (including cell stack and balance of plant [BOP]) with a turbo-blower was modeled using MATLAB/Simulink platform and the sensitivity analyses of main operating parameters were performed using the developed system model. Effects of small variations in four main parameters (stack temperature, cathode air stoichiometry, cathode pressure, and cathode relative humidity) on the system efficiency were investigated. The results show that cathode pressure has the greatest potential impact on the sensitivity of fuel cell system efficiency. It is expected that this study can be used as a basic guidance to understand the importance of achieving accurate control of the fuel cell operating conditions for the robust operation of automotive PEM fuel cell systems.

막가습기와 공기극 재순환을 사용한 고분자 전해질 연료전지의 가습특성 해석 (Study on PEM-Fuel-Cell Humidification System Consisting of Membrane Humidifier and Exhaust Air Recirculation Units)

  • 변수영;김범준;김민수
    • 대한기계학회논문집B
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    • v.35 no.4
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    • pp.337-344
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    • 2011
  • 고분자 전해질막 연료전지에서 공급 기체의 가습은 연료전지의 효율과 수명 향상 측면에서 필수적이다. 기존의 고분자 전해질막 연료전지의 가습 방법으로 물 분사나 막가습기, 엔탈피 휠 등이 사용되었다. 하지만, 이러한 외부 가습 방법은 시스템 부피를 크게 하고 고출력 구간에서 가습량이 부족한 단점이 있다. 가습 장치의 효율과 전체 연료전지 시스템 효율을 높이려면, 연료전지의 고온다습한 배출기체로부터 열과 수분을 회수할 필요가 있다. 본 연구에서는 연료전지의 고온다습한 배출공기를 재순환하여 공급공기를 1 차로 가습하고 소형의 막가습기로 2 차 가습하는 복합가습에 대한 해석적 연구를 수행하였다. 그리고 최적의 가습 시스템 설계를 위한 새로운 방법을 제안하였다.