一体式再生燃料电池温度和热流密度非原位同步测量

一体式再生燃料电池的热流密度和温度分布的研究对电池热管理具有重要的意义。本文将自制的薄膜传感器植入一体式再生燃料电池中，进行非原位实验研究。在给定不同气体预热温度下，测量了一体式再生燃料电池内部热流密度和局部温度，并根据已得到的温度和热流密度计算出局部表面传热系数。结果表明，在不同的气体预热温度下，流道内气体的温度和气体扩散层表面的温差维持在3℃左右。气体扩散层表面的热流密度整体呈现出下降的趋势。靠近加热棒处的温度最高，但热流密度最低。相同的气体预热温度下，流道内气体和气体扩散层表面的温差对换热量的影响要大于温度梯度的影响；气体预热温度的上升对表面传热系数h的影响不大。30℃时，表面传热系数h值在450 ~ 750 W/(m²?K) 之间。40℃时，表面传热系数h在450 ~ 650 W/(m²?K)之间。

Ex situ Simultaneous Measurement of Temperature and Heat Flux in Unitized Regenerative Fuel Cell

Study on heat flux and temperature distribution of the unitized regenerated fuel cell is of great importance for its thermal management. In this work, thin film sensors prepared by vacuum evaporation coating technology were placed into the unitized regenerative fuel cell, and ex situ experiments were implemented. The heat flux and local temperature of the unitized regenerative fuel cell were obtained, and then the local heat transfer coefficient was calculated. Results showed that, the temperature difference between the flow channel and gas diffusion layer was about 3°C under different preheating temperature. Heat flux at the surface of the gas diffusion layer witnessed a downward trend with time. In comparison, the temperature was highest and the heat flux was lowest near the heating rod. Compared with temperature gradient by the heating rod, temperature difference between gas in flow channel and in diffusion layer was more influential in heat transfer under the same gas preheating temperature. Gas preheating temperature had little effect on the local heat transfer coefficient. At 30°C and 40°C, the surface local heat transfer coefficient was in the range of 450 ~ 750 W/(m²?K) and range of 450 ~ 650 W/(m²?K) respectively.