利用燃料电池的经验方程建立了质子交换膜燃料电池（PENFC）的一雏稳态模型，进行了仿真和结果分析，仿真结果与实验数据吻合较好利用VB（Visual Basic）编写人机交互界面作为前台用户程序，以MATLAB的SIMULINK在后台运行，发展了一种基于MATLAB和vB软件包的质子交换膜燃料电池特性参数仿真实验软件，并对PEMFE的工作温度、反应气压力等参数对其性能的影响进行了仿真分析，有助于进行燃料电池特性参数仿真实验以及对燃料电池的分析、设计和优化。

制冷剂R2134a 在螺旋管内的凝结换热和压力降特性数据对于制冷空调和热泵等系统的设计改造及运行都具有重要的理论意义和工程应用价值。本文对R2134a 在螺旋环形通道内的凝结换热和压力降特性进行了实验研究,得到了平均的凝结换热系数和压力降特性的实验数据,并与文献报导的R2134a 在直管和螺旋管内凝结换热的实验结果进行了比较, 所得实验数据可望为新型螺旋管换热器的开发设计和工程应用提供参考数据。

A total energy system (TES) incorporating a solid oxide fuel cell (SOFC) and an exhaust gas driven absorption chiller (AC) is presented to provide power, cooling and/or heating simultaneously. The purpose for using the absorption chiller is to recover the exhaust heat from the SOFC exhaust gas for enhancing the energy utilization efficiency of the TES. A steady-state mathematical model is developed to simulate the effects of different operating conditions of SOFC, such as the fuel utilization factor and average current density, on the performance of the TES by using the MATLAB softpackage. Parametric analysis shows that both electrical efficiency and total efficiency of the TES have maximum values with variation of the fuel utilization factor; while the cooling efficiency increases, the electrical efficiency and total efficiency decrease with increase in the current density of SOFC. The simulated results could provide useful knowledge for the design and optimization of the proposed total energy system.