CAJ | 학술논문

风扇被用于空冷型 PEMFC 电堆的冷却和氧气的供应，空气流速的大小和分布对于提高电堆输出性能和内部温度的均匀性非常关键，可以通过改变风扇的工作电压（风扇工作在恒流模式）和风扇与 PEMFC 阴极入口的距离来调整。针对实验室自制空冷型PEMFC电堆进行实验来寻找风扇工作距离和工作电压对于电堆性能的影响，并利用多元回归拟合得到以电堆表面平均温度为因变量，以风扇工作电压和风扇工作距离为自变量的经验公式。研究结果表明：当风扇工作距离大于或小于其最优工作距离时，电堆性能均会发生衰减；当风扇处于最优工作距离时，电堆表面温度更加均匀，各单电池电压均匀性得到提高，并且此时所需的最优风扇工作电压更小。该研究对于提高空冷型PEMFC电堆输出性能、增加电堆运行稳定性、提高电堆系统效率等具有重要的指导和参考价值。
풍선피용우공랭형 PEMFC 전퇴적냉각화양기적공응，공기류속적대소화분포대우제고전퇴수출성능화내부온도적균균성비상관건，가이통과개변풍선적공작전압（풍선공작재항류모식）화풍선여 PEMFC 음겁입구적거리래조정。침대실험실자제공랭형PEMFC전퇴진행실험래심조풍선공작거리화공작전압대우전퇴성능적영향，병이용다원회귀의합득도이전퇴표면평균온도위인변량，이풍선공작전압화풍선공작거리위자변량적경험공식。연구결과표명：당풍선공작거리대우혹소우기최우공작거리시，전퇴성능균회발생쇠감；당풍선처우최우공작거리시，전퇴표면온도경가균균，각단전지전압균균성득도제고，병차차시소수적최우풍선공작전압경소。해연구대우제고공랭형PEMFC전퇴수출성능、증가전퇴운행은정성、제고전퇴계통효솔등구유중요적지도화삼고개치。
Fans are used for cooling and feeding oxygen in air-cooling proton exchange membrane fuel cell (PEMFC). For optimal performance, it is essential that the air is distributed as uniformly as possible and supplied sufficiently, which can be adjusted by varying the working distance and voltage of fans, in order to maintain temperature uniform (with the fan working in certain mode). Experiments were carried out for air cooling PEMFC, with the fan system working under the mode of “blowing”, to find the optimal distance. The temperature on the export side of cathode was measured to reflect the heat dissipation by Fluke Ti25 infrared thermal imager. The load box works under constant voltage mode and automatically records output current of stack, to evaluate the output performance. Moreover, an empirical formula is fitted according to the average temperature under different conditions, with working voltage and working distance as independent variables, and average temperature as the dependent variable. The results show that the performance of the stack declines when the fan is at a distance beyond or below the optimal value. At this optimal distance, the distribution of surface temperature is more uniform, the uniformity of unit cell voltage is better, and the required working voltage of fan system is less. This <br> work provides a guideline and serves as a reference to improve the performance of air-cooling PEMFC by increasing the stability and efficiency of the system.