燃料电池中各零件温度分布瞬态和稳态仿真：不影响仿真结果的两个因素［设计因素其十五］

Technology for Estimation of Fuel CellStack Temperature Using Transient Heat Transfer Simulation in Cell StackingDirection

Kensuke UMEZAWA

Kosuke MATSUI

Yuta IKEDA

ABSTRACT

A simulation of transient heat transfer inthe cell stacking direction was developed that makes it possible to estimate the temperature of the MEA atdifferent arbitrary stacking positions within the stack， including the casecomponents and the end cells， at a high level of accuracy under all operatingconditions that can be assumed for the vehicle environment． With regard tofactors that have a considerable effect on the temperature of the MEA butnecessitate a high volume of calculations， the introduction of a correctionterm based on fundamental data measured in a stack while generating powersimplified the calculations． In addition， by contrast with conventionalsimulation technology， factors that havelittle effect on the temperature of the MEA were identified and omitted．These initiatives have made it possible to conduct coupled calculations for theconstituent components of the stack without any decline in the accuracy oftemperature estimations． It was verified that the simulation of transient heat transfer in the cell stackingdirection was able to realize the target figure for temperature estimation accuracyof within ±5％ against actual measurements for both steady－state stack generationconditions and stack warm－up mode， including transient states．

Fig． 1 Structure of fuel cell stack

Fig． 2 Schematic image of heat  release from case components

双向流体

Fig． 3 Relationship between TMEA and position in stacking direction

经典的温度测量图

Fig． 4 Flow directions of  anode gas， cathode gas， and coolant

Fig． 5 Heat exchange amount  for each fluid with coolant as benchmark

发现1

Fig． 6 Schematic image of heat  exchange in cell in in－plane direction and through－plane direction

Fig． 7 Temperature measurement  points for inlet， outlet， and center cell

Fig． 8 Temperatures of MEA and coolant

发现2

Fig． 9 Roles of developed  simulation and conventional simulation

Fig． 10 Schematic image of heat flux in components

Fig．11 Relationship between  correlation coefficient and coolant flow rate

Fig．12 Schematic image of heat  flux between components A and B

F13 Simulation and measurement  results for fuel cell stack part temperatures during steady－state operation

F14 Schematic image of warm－up mode

F15 Simulation and measurement  results for fuel cell stack part temperatures in transient state during  warm－up mode