Transactions of the Korean Society of Mechanical Engineers B (대한기계학회논문집B)

The Korean Society of Mechanical Engineers (대한기계학회)
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Numerical Investigation of the Discharge Efficiency of a Vanadium Redox Flow Battery with Varying Temperature and Ion Concentration

온도와 이온농도의 변화에 대한 바나듐 레독스 플로우 배터리의 방전 효율에 관한 수치해석

  • Lee, Jonghyeon (Graduate school of Mechanical Engineering, Changwon Nat'l Univ.) ;
  • Park, Heesung (Graduate school of Mechanical Engineering, Changwon Nat'l Univ.)
  • 이종현 (창원대학교 대학원 기계공학과) ;
  • 박희성 (창원대학교 대학원 기계공학과)
  • Received : 2016.05.30
  • Accepted : 2016.10.08
  • Published : 2016.12.01
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Abstract

In this study, a numerical simulation of a vanadium redox flow battery was investigated for reactions involving an electrochemical species using comprehensive conservation laws and a kinetic model. For a 3-D geometry of the cell, the distributions of electric potential, vanadium concentration, overpotential, and ohmic loss were calculated. The cell temperature and initial vanadium ion concentration were set as variables. The voltage and electrochemical loss were calculated for each variable. The effects of each variable's impact on the electrochemical performance of a vanadium redox flow battery was numerically analyzed using the calculated overpotential in the electrode and the ohmic loss in the electrolyte phase. The cell temperature increased from $20^{\circ}C$ to $80^{\circ}C$ when the voltage efficiency decreased from 89.34% to 87.29%. The voltage efficiency increased from 88.65% to 89.25% when the vanadium concentration was changed from $1500mol/m^3$ to $3000mol/m^3$.

본 연구는 화학종을 포함한 반응을 위해 종합적인 보존법칙과 운동학적 모델을 사용하여 수치해석을 진행하였다. 삼차원 형상으로 전극 전위, 바나듐 이온농도, 과전압 그리고 저항손실을 계산하였다. 셀의 온도, 초기 바나듐 이온농도를 변수로 설정하고 각 변수에 따른 전압과 손실을 계산하였다. 계산된 양극, 음극에서의 과전압과 전해액 상의 저항 손실을 통해 각각의 변수가 바나듐 레독스 플로우 배터리의 전기화학적 성능에 미치는 영향을 수치해석적으로 예측하고 분석하였다. 셀의 온도가 $20^{\circ}C$에서 $80^{\circ}C$로 증가되면 전압효율은 89.34%에서 87.29%로 2.05% 감소한다. 바나듐 농도가 $1500mol/m^3$에서 $3000mol/m^3$으로 증가되면 전압효율은 88.65%에서 89.25%로 0.6% 상승하였다.

Keywords

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