移动边界模型应用于废热驱动的有机朗肯循环系统的动态仿真

针对废热回收的有机朗肯循环进行了动态仿真和实验验证.循环工质为R245fa(1,1,1,3,3-五氟丙烷).分别采用移动边界和离散两种方式建立了蒸发器和冷凝器的模型.模型运行结果与实验数据之间的最大误差不超过4%,显示模型能够真实反映实际系统的性能.分析表明,移动边界模型具有比离散模型低的阶次,处理速度较快,更适合于以控制为导向的动态仿真和实时系统仿真,且在系统负荷突变时具有良好的强壮性.

Moving Boundary Model Application in the Dynamic Simulation of an Organic Rankine Cycle(ORC)System Driven by Exhaust

This article presented a dynamic simulation and validation of an organic Rankine cycle(ORC) system using R245fa(1,1,1,3,3-pentafluoropropane) as organic working fluid for waste heat recovery.The moving boundary model(MB-model) and discretized model(DS-model) of evaporator and condenser were built respectively.The comparison made among the simulation results and experimental data shows that the models can reveal real system performance sufficiently.The analysis shows that MB-model has less number of states than DS-model and more suitable for control-oriented modeling and MB-model is numerically faster than DSmodel and very robust to sudden changes of the load of the system.