Computer Controlled Capacity Control and Faults in Refrigeration Systems

The Computer Controlled Capacity Control and Faults in Refrigeration Systems, to explore various power regulation techniques and simulate typical failures in refrigeration systems.

ATENG 12950 — Computer Controlled Capacity Control and Faults in Refrigeration Systems

(for main items)

• With this unit there are several options and possibilities:
• Main items: 1, 2, 3 and 4.
• Optional items: 5, 6, 7, 8 and 9.
• Let us describe first the main items (1 to 4):
• 1 ATENG 12950 Unit:
  Anodized aluminum frame and panels made of painted steel.
  The unit includes wheels to facilitate its mobility.
  Main metallic elements made of stainless steel.
  Diagram in the front panel with distribution of the elements
  similar to the real one.
  Testing unit for training apprentices in the field of refrigeration.
  Investigation of a refrigeration system with cooling and
  freezing chambers.
  Refrigeration circuit with compressor, condenser, power
  controller, start-up controller, combined pressure switch, and
  two evaporators in isolated chambers.
  Each chamber includes a solenoid valve, thermostat,
  thermostatic expansion valve, fan, and heat exchanger for
  refrigerant subcooling.
  Cooling chamber with an evaporation pressure regulator.
  Freezing chamber with defrosting by electric heater and hot
  gas defrosting.
  Operation of the chambers either separately or in parallel
  through solenoid valves.
  Simulation of 18 faults.
  Touch screen for fault activation, data acquisition, and
• evaluation and representation of the log p-h diagram. Unit: ATENG 12950
• Refrigerant:
• Refrigerant recommended by R513A (type A1, lower toxicity and non-flammable). Possibility
  of replacing the refrigerant at the client's request, after a study by (e.g., R134a).
  Low CO emissions rate.
• GWP (Global Warming Potential) of the refrigerant recommended by : 631.
  ₂
• Main components (described in the equipment diagram):
  Isolated freezing chamber with fan and electric heater.
  Check valve for hot gas defrosting process.
  Condensation pressure regulator.
  Condenser.
  Reservoir pressure regulator.
  Compressor.
  Start-up controller.
  Power controller.
  Evaporation pressure regulator.
  Isolated cooling chamber with fan.
  Solenoid valves.
  Heat exchanger.
• Expansion devices:
  Thermostatic expansion valve.
  Manual expansion valve.
  Capillary tube.
• Thermostats:
  Combined pressure switch.
  Flow meters.
  Manometers.
  Sensors.
  Touch screen panel.
• Technical details:
• Compressor: cooling capacity of 1600 W.
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Complete Technical Specifications (for main items)

• Condenser with fan: air volumetric flow rate, 570 m³/h.
• Evaporator heat transfer areas:
• Cooling chamber: 1.12 m².
• Freezing chamber: 1.88 m².
• Electric heater: 125 W.
• Power controller: 0.2 – 6 bar.
• Compressor start-up controller: 0.2 – 6 bar.
• Thermostats: 2 units, -25 – 15 °C.
• Evaporation pressure controller: 0 – 5.5 bar.
• Measurement ranges for thermometers, manometers, and flow meters:
• Temperature: 6 units, -50 – 50 °C; 5 units, 0 – 100 °C.
• Pressure: 3 units, -1 – 12.5 bar; 2 units, -1 – 24 bar.
• Flow: 2 units, 1.5 – 22.5 l/h.
• Compressor power consumption: 0 – 5 kW.
• Power supply: 380 V, 60 Hz, three-phase or 230 V, 60 Hz, three-phase.
• The complete unit includes as well:
  Advanced Real-Time SCADA.
  Open Control + Multicontrol + Real-Time Control.
  -specific Control Software, based on LabVIEW.
  Calibration exercises included, teaching users how to calibrate sensors and the importance
  of verifying sensor accuracy before performing measurements.
  Prepared for applied research, real industrial simulation, training courses, etc.
  Users can carry out practices remotely by controlling the equipment, and additionally, the
  technical department can perform remote control.
  The unit is fully safe, featuring 4 safety systems (mechanical, electrical, electronic, and
  software-based).
  Designed and manufactured in accordance with several quality standards.
  Optional ICAI software for creating, editing, and performing practical exercises, exams,
  calculations, etc. Additionally, it allows monitoring of the user’s progress and knowledge.
  This unit has been designed for future expansion and integration. A common expansion is
  the Scada-Net (ESN) System which enables multiple students to simultaneously
  operate many units in a network.
• 2 TCFRC/CCSOF. Computer Control + Data Acquisition + Data Management Software:
  The three softwares are part of the SCADA system.
  Compatible with actual Windows operating systems. Graphic and intuitive simulation of the process in
  screen. Compatible with the industry standards.
  Registration and visualization of all process variables in an automatic and simultaneous way.
  Flexible, open and multicontrol software, developed with actual windows graphic systems, acting
  simultaneously on all process parameters.
  Management, processing, comparison and storage of data.
  Calibration system for the sensors involved in the process.
  It allows the registration of the alarms state and the graphic representation in real time.
  Comparative analysis of the obtained data, after the process and modification of the conditions during TCFRC/CCSOF
  the process.
  Open software, allowing the teacher to modify texts, instructions. Teacher’s and student’s
  passwords to facilitate the teacher’s control on the student, and allowing the access to different work
  levels.
  This unit allows the 30 students of the classroom to visualize simultaneously all the results
  and the manipulation of the unit, during the process, by using a projector or an electronic
  whiteboard.
  3 Cables and Accessories, for normal operation.
• 4Manuals:
• This unit is supplied with 8 manuals: Required services, Assembly and Installation, Control software,
  Starting-up, Safety, Maintenance, Calibration & Practices manuals.
• References 1 to 4 are the main items: ATENG 12950 + TCFRC/CCSOF + Cables and Accessories + Manuals are included in the minimum
  supply for enabling normal and full operation.
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