Evaporator control with electronic expansion valve Practical programming of a modern refrigeration controller Features - practical programming of a modern refrigeration controller - software to simulate a commercial freezer - real components of evaporator control fitted to front panel for demonstration purposes Learning objectives/experiments - modern refrigeration controller with electronic expansion valve - functional principle of the controller -- thermostat function -- daytime and night-time operation -- operation with open and closed freezer -- defrost functions -- safety functions -- alarm functions -- monitoring of the components - controller programming - fault finding Specification [1] experimental unit from the GUNT practical series for the training of mechatronics engineers for refrigeration [2] investigation and programming of an industrial refrigeration controller in the example of a freezer [3] simulation of the freezer by way of software [4] schematic on the front panel with lamps to indicate the operating states of the actuators [5] programming of the refrigeration controller using a programming device [6] simulated freezer with compressor, electronic expansion valve, fan, electric defrost heater for the evaporator, frame heating, pressure and temperature sensors [7] real freezer components for demonstration purposes: 1 electronic expansion valve, 1 pressure sensor, 2 temperature sensor [8] GUNT software for data acquisition via USB under Windows 10 Technical data Functions of the refrigeration controller - thermostat function - daytime/night-time operation - defrost functions - messages and alarms - fan operation - energy saving functions - safety functions Simulated sensors - air temperature upstream of the evaporator - air temperature downstream of the evaporator - evaporator surface temperature - refrigerant temperature upstream of the compressor - refrigerant pressure upstream of the compressor Functions of the simulation software - outer temperature input - opening/closing the door - selection of refrigerant - pressure and temperature time graphs 230V, 50Hz, 1 phase 230V, 60Hz, 1 phase; 120V, 60Hz, 1 phase UL/CSA optional LxWxH: 660x350x570mm Weight: approx. 30kg