燃料电池热管理仿真模型

Fuel Cell Thermal Management Simulation Model

根据燃料电池的热特性,对燃料电池汽车散热模块进行仿真计算,同时辅以试验验证,并用试验结果修正仿真模型.在燃料电池汽车散热模块仿真计算过程中采用了2种计算模型即对数平均数法和传热单元数法.用2种计算模型进行计算、分析,得到对数平均数法和传热单元数法都适合于燃料电池运行工况的散热计算.2种方法相比,对数平均数法在冷却液小流量时误差较大,而传热单元数法的适用工况范围广、计算的准确程度高,优于对数平均数法.

According to the thermal characteristics of fuel cell,the radiation module of fuel cell vehicle is calculated and the simulation is modified with experiment results.Two different models,logarithmic mean temperature difference（LMTD） and ε-NTU,are used in the radiation calculation.Both models prove to be suitable for the calculation of thermal management system in the fuel cell vehicles.A comparative study of the two methods shows the errors of LMTD are bigger in low flow rate of coolant,whereas ε-NTU is superior to LMTD which is therefore used more widely for its accuracy.