Evaporator Control With Electronic Expansion Valve
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Product Description
EVAPORATOR CONTROL WITH ELECTRONIC EXPANSION VALVE
The control of refrigeration units such as chiller cabinets, refrigerated display cases and freezers is a key topic in commercial
refrigeration. The control aims at safeguarding a high level of food quality with simultaneous energy-efficient operation.
The refrigeration controller continuously monitors the operation of the components and issues an alarm signal should errors occur. The controller is programmed via a data cable using a programming device. This allows for adjustments of the thermostat function, daytime/night-time operation, the defrosting function, energy saving functions and safety functions. In the simulation software the outside temperature is entered, the refrigerant selected and the door of the freezer opened or closed. In the "time graph" menu, the operating states of the individual components are displayed and the temperature and pressure graphs recorded.
Additional real components, such as expansion valve and pressure and temperature sensors, are used for demonstration purposes and increase the practical relevance.
The well-structured instructional material sets out the fundamentals and provides a step-by-step guide through the experiments.
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
- 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 simulation via USB under Windows Vista or Windows 7
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
Dimensions and Weight
- L x W x H: 660 x 350 x 570 mm
- Weight: approx. 20 kg
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