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

Specification

• experimental unit from the practical series for the training of mechatronics engineers for refrigeration
• investigation and programming of an industrial refrigeration controller in the example of a freezer
• simulation of the freezer by way of software
• schematic on the front panel with lamps to indicate the operating states of the actuators
• programming of the refrigeration controller using a programming device
• simulated freezer with compressor, electronic expansion valve, fan, electric defrost heater for the evaporator, frame heating, pressure and temperature sensors
• real freezer components for demonstration purposes: 1 electronic expansion valve, 1 pressure sensor, 2 temperature sensor
• software for data acquisition via USB under Windows 8.1, 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