Modeling and model order reduction of evaporator in organic rankine cycle for waste heat recovery

The moving boundary method is used to model the evaporator in waste heat recovery system. Four reducing algorithms, balanced truncation reducing method, its modified balanced singular perturbation approximation, time scale method and time scale method combined with singular perturbation are discussed in detail. For the practical application of evaporator, the low-order models are obtained by four model reduction methods, respectively. Simulation results show that the models after order reduction can reflect the dynamic characteristics of moving boundary model.