Nonlinear Superheat Control of a Refrigeration Plant using Backstepping

This paper proposes a novel method for superheat and capacity control of refrigeration systems. The main idea is to control the superheat by the compressor speed and capacity by the refrigerant flow. A new low order nonlinear model of the evaporator is developed and used in a backstepping design of a nonlinear controller. The proposed method is validated by experimental results.