Computer Controlled Capacity Control Methods in Refrigeration

The Computer Controlled Capacity Control Methods in Refrigeration, allows to study and to investigate several methods of capacity control.

ATENG 12769 — Computer Controlled Capacity Control Methods in Refrigeration

(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, y 9.
• Let us describe first the main items (1 to 6):
• 1THARA2C/1. 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.
• Computer controlled compressor, with adjustable speed:
• Refrigeration capacity: 2.57 kW at -5/20 °C.
• Power: 2 HP.
  The compressor includes a capacity controller in the
• compressor bypass. Regulation range: 0.2 – 6 bar.
• Computer controlled air condenser:
• Power: 135 W.
• Flow: 2200 m³/h.
  Two evaporators in insulated refrigeration chambers.
• Each refrigeration chamber includes:
  Computer controlled adjustable heating element, to
• generate a refrigeration load. Power: 500 W approx.
  Computer controlled set of fans. Maximum air volume
• flow: 42 m³/h.
  The refrigeration chamber (refrigeration) includes a
  computer controlled solenoid valve and a pressure
• regulator for temperature control. Regulating range:
• 0 - 5.5 bar.
• Unit: ATENG 12769
  The refrigeration chamber (freezing) includes a
  solenoid valve, a non-return valve and a defrosting heating element (75 W approx.). Adjustable
• heating element. Power: 500 W approx.
• Ten “J” type temperature sensors. They are situated in:
  Temperature sensor is located at the refrigeration chamber (refrigeration).
  Temperature sensor is located at the inlet of the refrigeration chamber (refrigeration).
  Temperature sensor is located at the outlet of the refrigeration chamber (refrigeration).
  Two temperature sensors are located at the refrigeration chamber (freezing).
  Temperature sensor is located at the inlet of the refrigeration chamber (freezing).
  Temperature sensor is located at the outlet of the refrigeration chamber (freezing).
  Two temperature sensors are located at the inlet and the outlet of the compressor.
  Temperature sensor is located at the outlet of the condenser.
• Flow sensor situated at the inlet of the refrigeration chambers, range: 5 – 60 l/h.
• Four pressure sensor. They are situated in:
• Pressure sensor is located at the inlet of the compressor, range: 0 – 10 bar.
• Pressure sensor is located at the outlet of the compressor, range: 0 – 25 bar.
• Two pressure sensors are located at the inlet of the refrigeration chambers, range: 0 – 10 bar.
• Four manometers. They are situated in:
• Manometer is located at the inlet of the compressor, range: 0 – 10 bar.
• Manometer is located at the outlet of the compressor, range: 0 – 25 bar.
• Two manometers are located at the inlet of the refrigeration chambers, range: 0 – 10 bar.
  High and low pressure control.
  Refrigerant filter.
  Refrigerant accumulation tank.
  Two PID controls enable constant temperature operation by controlling the open or close of the two
  solenoid valves.
  The software incorporates a “defrost process” to defrost the layer of frost of the second refrigeration
  chamber (freezing).
  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 and PID Control.
  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, as well as remote support from 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.