为了探究相对湿度对质子交换膜燃料电池(PEMFC)能量效率的影响，提出

In order to explore the influence of relative humidity on the energy efficiency of proton exchange membrane fuel cells (PEMFC), a numerical model of the energy efficiency (GE) of proton exchange membrane fuel cells was proposed. Based on the original energy efficiency formula, the model uses the reciprocal principle of stoichiometric ratio and fuel utilization rate to derive the specific expression of fuel utilization rate, thus perfecting the energy efficiency model, and considering the relative humidity and relative humidity. The influence of the change of the amount of water in the proton exchange membrane on the energy efficiency. This article intends to use the combination of theory and experiment. Firstly, the GE model is imported into Fluent for calculation through a user-defined function (UDF). Secondly, a water-cooled proton exchange membrane fuel cell test system is established, and the working conditions are set to a working temperature of 60. ℃, intake pressure is 10kPa, relative humidity is 50% and 100% respectively. Finally, the GE model, Fluent's own model and test data are compared and analyzed. The results show that when the relative humidity of the symmetric humidification is 50%, the minimum error of the polarization curve between the GE model and the experimental data is 2.24%; when the relative humidity of the symmetric humidification is 100%, the polarization curve between the GE model and the experimental data is the smallest The error is 2.24%; the energy efficiency increases as the relative humidity of the intake air increases; when the relative humidity is 100% and the power density increases to 110.869mW·cm-2, the maximum energy efficiency that can be achieved is 46.879%.

In order to explore the effect of relative humidity on the energy efficiency of proton exchange membrane fuel cell (PEMFC), a numerical model of proton exchange membrane fuel cell energy efficiency (GE) is proposed. Based on the original energy efficiency formula, the model uses the principle of chemical metering ratio and fuel utilization to infer the expression of specific fuel utilization rate, thus perfecting the energy efficiency model and considering the effect of changes in relative humidity and water volume in proton exchange membranes on energy efficiency. In this paper, it is proposed to use the method of combining theory with experiments, first by introducing the GE model into TheFluent through a custom function (UDF), then establishing a water-cooled proton exchange membrane fuel cell test system, and setting the operating condition parameters to 60 degrees C, the air pressure to 10kPa, the relative humidity to 50% and 100%, respectively, and finally to the GE model, fluent bring-your-own model and test data analysis. The results show that when the relative humidity of symmetrical humidification is 50%, the minimum error of the polarization curve between the GE model and the test data is 2.24%, and when the relative humidity of symmetrical humidification is 100%, the minimum error of the polarization curve of the GE model and the test data is 2. .24%, energy efficiency increases with the increase of relative humidity of the air infested, and when the relative humidity is 100% and the power density increases to 110.869mW.cm-2, the maximum energy efficiency can be achieved is 46.879%.

In order to explore the effect of relative humidity on energy efficiency of proton exchange membrane fuel cell (PEMFC), a numerical model of energy efficiency (GE) of PEMFC was proposed. Based on the original energy efficiency formula, this model uses the reciprocal principle of stoichiometric ratio and fuel utilization ratio to derive the specific expression of fuel utilization ratio, which improves the energy efficiency model and takes into account the influence of relative humidity and water content in proton exchange membrane on energy efficiency. Firstly, the Ge model is imported into fluent by UDF for calculation. Secondly, the water-cooled PEMFC test system is established, and the operating parameters are set as working temperature of 60 ℃, inlet pressure of 10KPA and relative humidity of 50% and 100% respectively. Finally, the Ge model, the built-in model of fluent and the test data are analyzed The results were compared and analyzed. The results show that: when the relative humidity of symmetrical humidification is 50%, the minimum error of polarization curve between GE model and test data is 2.24%; when the relative humidity of symmetrical humidification is 100%, the minimum error of polarization curve between GE model and test data is 2.24%; the energy efficiency increases with the increase of inlet relative humidity; when the relative humidity is 100%, and the power density increases to 110.869mw · cm-2, the minimum error of polarization curve between GE model and test data is 2.24% The maximum energy efficiency is 46.879%.<br>