A new moving boundary model is presented for describing the dynamics of dry-expansin evaporators. The model is derived from conservation equations for mass and energy integrated over the two-phase and the superheated region. The new model is numerical fast compared to discretized models and very robust to sudden changes in the system. The model is well suited for open loop simulation for system design and model based contol strategies as e.g. optimal LQG (linear quadratic gausian) control. Simulation results for a refrigeration system are shown for different changes in evaporator fan speed, compressor speed and expansion valve opening. The simulation results show the expected trends, but the model has not yet been validated with experimental data.
|Title of host publication||Proceedings of the 15th International Conference on Efficiency, Costs, Optimization, Simulation and Environmental Impact of Energy Systems (ECOS 2002)|
|Publication status||Published - 2002|
|Event||ECOS 2002: 15th International Conference on Efficiency, Costs, Optimization, Simulation and Environmental Impact of Energy Systems (ECOS 2002) - Berlin, Germany|
Duration: 3 Jul 2002 → 5 Jul 2002
|Period||03/07/2002 → 05/07/2002|