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Conference paper

A new moving boundary model for transient simulation of dry-expansion evaporators

In Proceedings of the 15th International Conference on Efficiency, Costs, Optimization, Simulation and Environmental Impact of Energy Systems (ecos 2002) — 2002

By Jensen, Jakob Munch1; Knudsen, Hans-Jørgen Høgaard1,2

From

Department of Mechanical Engineering, Technical University of Denmark1

Energy Engineering, Department of Mechanical Engineering, Technical University of Denmark2

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.

Language: English
Year: 2002
Proceedings: ECOS 2002
Types: Conference paper

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