NONLINEAR SUPERHEAT AND EVAPORATION TEMPERATURE CONTROL OF A REFRIGERATION PLANT

This paper proposes novel control of the superheat of the evaporator in a refrigeration system. A new model of the evaporator is developed and based on this model the superheat is transferred to a referred variable. It is shown that control of this variable leads to a linear system independent of the working point. The model also gives a method for control of the evaporation temperature. The proposed method is validated by experimental results.