Program Solution for Regulation and Monitoring of Evaporator Section in Individual Quick-Freezing Process

In this paper a program solution for control and monitoring of evaporator section in cooling tunnel is proposed. Control strategy for freezing process is designed to work according to temperature probes used for measurement of temperature of frozen goods. Defrost control is designed to work with active probes used for ice thickness measurement thus providing more efficient defrosting of pipeline section in evaporator. Monitoring of certain values of significance is maintained by using pressure observation in condenser circuit and temperature observation expanded to room/tunnel temperature along with probes used in control (goods’ temperature). Also, significant actuator states are also monitored: evaporator fan speed and defrosting heater switching state.