TCFR Computer Controlled Capacity Control and Faults in Refrigeration Systems Unit

COMPUTER CONTROLLED CAPACITY CONTROL AND FAULTS IN REFRIGERATION SYSTEMS UNIT - TCFR

General Description

The purpose of the Computer Controlled Capacity Control and Faults in Refrigeration Systems Unit "TCFR" is to investigate different methods of capacity control and to simulate 12 different typical faults in refrigeration systems.

The efficient control of the capacity and temperature in refrigeration systems is an important topic in refrigeration technology. The "TCFR" has been designed by EDIBON to carry out different methods of capacity control in refrigeration systems.

The components of a refrigeration circuit with refrigeration and freezing chambers are arranged clearly in this unit.

The "TCFR" includes solenoid valves which enable the separate or parallel operation of the evaporators in the two chambers. Besides, the circuit is equipped with a capacity controller, a start-up controller and a combined pressures switch for the delivery and intake sides of the compressor. One heat exchanger in the inlet of the two evaporators enables the supercooling of the refrigerant to be investigated for the efficiency of the process. The refrigeration capacity of the two individual chambers is controlled by a thermostat. On the other hand the refrigeration chamber also features an evaporation pressure controller. There are two defrosting methods for the freezing chamber: an electric defrost heater and a hot gas defrosting where hot refrigerant is fed directly from the compressor in the opposite direction through the evaporator. The unit is designed to simulate 12 different faults, such as faulty valves or clogged pipes. The faults are activated using a touch panel connected to a PC with a Data Acquisition Board which allows:

- Relevant measured values that are transmitted directly to the touch panel from the PC.

- Representation of the thermodynamic cycle in the log p-h diagram.

- Recording of the test measurements versus time and generation of a file compatible with spreadsheet applications.

The following are the most important objectives and experiments which can be carried out with this unit:

Familiarization with the key devices for changing the refrigeration capacity:

Thermostat.

Capacity controller.

Start-up controller.

Evaporation pressure controller.

Condensation pressure controller.

Fault finding in refrigeration system components.

Effect of refrigerant supercoiling.

Familiarization with defrosting methods:

Electric defrost heater.

Hot gas defrosting.

Representation of the thermodynamic cycle in the log p-h diagram.

The Data Acquisition and Control Software of the "TCFR" unit allows:

The calculation of representative magnitudes: power of the combustion engine and specific consumption of fuel.

The representation of the characteristic curves of the combustion engines: torque, power or specific consumption versus velocity of the combustion engine.

The representation of the measured and calculated magnitudes curves, in signal versus signal charts. Free configuration of the axes of these charts.

The representation in real time of all the measured and calculated magnitudes.

Exercises and guided practices

GUIDED PRACTICAL EXERCISES INCLUDED IN THE MANUAL

  1. Familiarization with the key devices for changing the refrigeration capacity:
  • Thermostat.
  • Capacity controller.
  • Start-up controller.
  • Evaporation pressure controller.
  • Condensation pressure controller.
  1. Fault finding in refrigeration system components.
  2. Effect of refrigerant supercoiling.
  3. Familiarization with defrosting methods:
  • Electric defrost heater.
  • Hot gas defrosting.
  1. Representation of the thermodynamic cycle in the log p-h diagram.
  2. Sensors calibration.

MORE PRACTICAL EXERCISES TO BE DONE WITH THE UNIT

  1. Properties of the R404a refrigerant.
  2. Enthalpy-pressure diagram for the R404a refrigerant.
  3. Many students view results simultaneously. To view all results in real time in the classroom by means of a projector or an electronic whiteboard.
  4. Open Control, Multicontrol and Real Time Control. This unit allows intrinsically and/or extrinsically to change the span, gains, proportional, integral, derivative parameters, etc, in real time.
  5. The Computer Control System with SCADA and PID Control allow a real industrial simulation.
  6. This unit is totally safe as uses mechanical, electrical and electronic, and software safety devices.
  7. This unit can be used for doing applied research.
  8. This unit can be used for giving training courses to Industries even to other Technical Education Institutions.
  9. Control of the TCFR unit process through the control interface box without the computer.
  10. Visualization of all the sensors values used in the TCFR unit process.
  11. By using PLC-PI additional 19 more exercises can be done.
  12. Several other exercises can be done and designed by the user.

Quality

AFTER-SALES SERVICE