<논문>
유로형상 및 운전조건에 따른 고분자 전해질 연료전지의 성능 특성
이필형† 조선아* 한상석* 황상순**
Performance Characteristics of PEMFC by flow Configurations and Operating Condition
Pil-Hyong Lee
†, Son-Ah Cho
*, Sang-Seok Han
*, Sang-Soon Hwang
**Key Words: Proton exchange membrane fuel cell(고분자 전해질 연료전지), Parallel flow pattern (평행류 유동 형상), Interdigitated flow pattern(Interdigitated 유동 형상)
Abstract
For proton exchange membrane fuel cell, it is very important to design the flow channel on separation plate optimally to maximize the current density at same electrochemical reaction surface and reduce the concentration polarization occurred at high current density. In this paper, three dimensional computation model including anode and cathode domain together was developed to examine effects of flow patterns and operation conditions such as humidity and operating temperature on performance of fuel cell. Results show that voltage at counter flow condition is higher than that at coflow condition in parallel and interdigitated flow pattern. And fuel cell with interdigitated flow pattern which has better mass transport by convection flow through gas diffusion layer has higher performance than with parallel flow pattern but its pressure drop is increased such that the trade off between performance and pressure drop should be considered for selection of flow pattern of fuel cell.
Nomenclature
Equivalent weight of a dry membrane( )
Molecular weight of hydrogen( )
Molecular weight of oxygen( )
Water content in the membrane
Electro-osmotic drag coefficient(number of water molecules carried per proton)
Overpotential for oxygen reaction( )
† Dept. of Mechanical engineering, University of Incheon, Incheon 402-749 Korea.
TEL : (032) 770-8417 FAX : (032) 770-8410
* Dept. of Mechanical engineering, University of Incheon, Incheon 402-749 Korea.
** Corresponding Author,
Dept. of Mechanical engineering, University of Incheon, Incheon 402-749 Korea.
E-mail : [email protected]
1. Introduction
2. Computational Methode
2. 1 지배방정식 1) 질량 보존 방정식
∇⋅ (1)
: Anode (2)
: Cathode (3)
3
℃
∇ ∇ ∇ ∇
(5)
3) 화학종 보존방정식
∇ ∇ ∇
(7)
(8)
(9)
2.2 수치해석모델
(a)Parallel유동채널 (b)Interdigitated유동채널
Fig.2 Parallel유동채널과 Interdigitated유동채널의 격자구조
3. Results and Discussions
Fig.3 실험데이터와 수치해석결과와의 비교
℃
a. Parallel Flow Field b. Interdigitated Flow Field Fig.4 Coflow에서의 유로단면에서의 속도분포 ( )
5
Fig.6 Parallel유동채널과 Interdigitated유동채널에서 의 Coflow와 Counterflow에서의 전류밀도 비교 ( )
Fig.7 Parallel유동채널과 Interdigitated유동채널에서 의 Coflow와 Counterflow에서의 Pressure Drop ( )
a. Parallel Flow Field b.Intedigitatedl Flow Field Fig.8 채널내의 의 분포( )
Fig.8 Parallel유동채널과 Interdigitated유동채널에서 의 Counterflow에서의 I-V 곡선 비교
Reference
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