【摘要】 基于能量守恒原理建立了电堆的动态热传输模型,比较全面地考虑了影响电堆热传输的因素.仿真结果表明,在不考虑冷却且反应气体输入流量略大于负载电流所需流量情况下,随负载电流的增大电堆温度快速上升;当电堆电流为常数时,随着提高输入气体的流量,电堆温度由不稳定状态逐渐过渡到稳定状态,且稳定值随之下降;另外,当加入冷却系统后,可以充分保证电堆在较理想的温度下运行.模型仿真结果与实验数据能够较好吻合.更多还原

【Abstract】 A heat transport dynamic model of proton exchange membrane fuel cell (PEMFC) stack and the factors affecting stack temperature were considered. Neglecting cooling effect, the stack temperature increases quickly with the stack current, if the feeding gas rate of reactant is a little higher than one needed for the load. If the stack current is constant, with the increase of the feeding rate of reactants, the results also show that the stack temperature may transit to a stable region from an unstable one. Moreover, the simulation shows that it is desired to use a cool system to keep the stack working steadily. The experimental data well agree with the simulation results.更多还原