Computer Controlled Refrigeration Unit with Refrigeration and Freezing Chamber

The Computer Controlled Refrigeration Unit with Refrigeration and Freezing Chamber, to study a refrigeration system with two different chambers at different temperature.

ATENG 12767 — Computer Controlled Refrigeration Unit with Refrigeration and Freezing Chamber

(for main items)

• With this unit there are several options and possibilities:
• Main items: 1, 2, 3, 4, 5 and 6.
• Optional items: 7, 8, 9, 10 and 11.
• Let us describe first the main items (1 to 6):
• 1 ATENG 12767. Unit:
  Bench-top unit.
  Anodized aluminum frame and panels made of painted steel.
  Main metallic elements made of stainless steel.
  Diagram in the front panel with distribution of the elements similar to the
  real one.
  This unit is designed to investigate a refrigeration system with
  refrigeration and freezing chambers with 1125 W of power. This unit is
  used for the training of apprentices in the field of refrigeration.
• High pressure area:
  Hermetic compressor of 490 W, 5/40 °C for refrigerant R-513a,
• computer controlled. Refrigerant capacity: 1100 W, 5/40 °C.
  Wattmeter to measure the compressor power.
• Three pressure sensors located in the high pressure area, range:
• 1 – 24 bar.
  High pressure manometer located at the outlet of the compressor.
• Temperature sensor located at the outlet of the compressor, range: -50
• 120 °C.
• Double pressure switch of 32/7.5 bar.
• Condensation area:
  Air condenser, computer controlled, of 290 m³/h and 1.5 m² of area,
  with fan.
  High pressure manometer located at the outlet of the condenser.
• Temperature sensor located at the outlet of the condenser, range: -50
• 120 °C.
• Unit: ATENG 12767
  Refrigerant receiver. Refrigerant filter to retain particles of condensate.
• Refrigerant flow sensor, range: 5 – 60 l/h. Heat exchanger for supercooling.
• Low pressure area:
  Two solenoid valves, computer controlled.
  Two expansion valves.
• Three pressure sensors located after the expansion valves, range: -1 – 9 bar.
  Two low pressure manometers located after the expansion valves.
• Two temperature sensors located after the expansion valves, range: -50 – 120 °C.
• Compressor inlet:
  Liquid separator to retain liquid particles before going on to the compressor.
• Temperature sensor located at the inlet of the compressor, range: -50 – 120 °C.
  Low pressure manometer located at the compressor inlet.
• Pressure sensor located at the compressor inlet, range: -1 – 15 bar.
• Evaporation area:
• Refrigeration:
  Insulated refrigeration chamber with a capacity of 20 l, and with 1 m² of evaporator area.
  Evaporator of the refrigeration chamber.
• Evaporation pressure control valve, range: 0 – 5.5 bar.
  Low pressure manometer located at the outlet of the refrigeration chamber evaporator.
• Temperature sensor located at the outlet of the refrigeration chamber evaporator, range: -50 – 100 °C.
• Temperature sensor located at the refrigeration chamber, range: -50 – 100 °C.
• Freezing:
  Insulated freezing chamber with a capacity of 20 l, and with 2.42 m² of evaporator area.
  Evaporator of the freezing chamber with computer controlled fan with 135 m³/h of air flow rate.
  Heating element of 150 W for defrosting, computer controlled.
  Low pressure manometer located at the outlet of the freezing chamber evaporator.
  Temperature sensor located at the outlet of the freezing chamber evaporator.
  Temperature sensor located in the evaporator of the freezing chamber.
  Temperature sensor located in the freezing chamber.
• Complementary instrumentation:
• Three thermocouple with range: -50 – 100 °C.
  Enthalpy diagram of R-513a.
  This unit has been designed for the use with the refrigerant R-513a, CFC-free, environmental friendly.
  4

Complete Technical Specifications (for main items)

• The complete unit includes as well:
  Advanced Real-Time SCADA.
  Open Control + Multicontrol + Real-Time Control.
  Specialized Control Software based on LabVIEW.
  National Instruments Data Acquisition board (250 KS/s, kilo samples per second).
  Calibration exercises, which are included, teach the user how to calibrate a sensor and the
  importance of checking the accuracy of the sensors before taking measurements.
  Projector and/or electronic whiteboard compatibility allows the unit to be explained and
  demonstrated to an entire class at one time.
  Capable of doing applied research, real industrial simulation, training courses, etc.
  Remote operation and control by the user and remote control for technical support,
  are always included.
  Totally safe, utilizing 4 safety systems (Mechanical, Electrical, Electronic & Software).
  Designed and manufactured under several quality standards.
  Optional ICAI software to create, edit and carry out practical exercises, tests, exams,
  calculations, etc. Apart from monitoring user's knowledge and progress reached.
  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.