Recirculating Air Conditioning Unit

The objective of the Recirculating Air Conditioning Unit, is to introduce the student into the complex world of air conditioning systems, as well as studying and determining the optimal parameters for the operation of the unit in function of the environmental requirements (humidity, heat, temperature and cooling, etc. ).

ATENG 12715 — Recirculating Air Conditioning 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.

• Tunnel made of stainless steel of 300 x 300 x 4000 mm, in which there has been installed
• four windows of 200 x 300 mm to visualize the tunnel inside.
• Two electrical heating elements: one of 2000 W (pre-heater) at the inlet of the evaporator
  and other of 1000 W (re-heater) at the outlet of the evaporator.
• Axial fan, with speed regulation, 2500 rpm, maximum flow: 2160 m³/h.
  Evaporator.
• Condenser unit, consists of:
• Compressor, 1/2 HP, 4.48 A.
  ATENG 12715 detail
  Condenser, 1591 BTU.
  Air flow 900 m³/h.
• High-pressure cut-out, regulated at 14 bar. It switch off the compressor when the pressure reach the fix pressure.
  Filter dryer.
• Three Bourdon manometers, two of 10 bar and one of 25 bar:
  Bourdon manometer (condenser outlet).
  Bourdon manometer (evaporator inlet).
  Bourdon manometer (evaporator outlet).
  Two flow meters for air flow measurement in the tunnel.
  Five hygrometers, placed along the tunnel, formed each one by two temperature sensors (wet and dry bulb).
• Thirteen temperature sensors:
• Ten temperature sensors, placed in the tunnel to form five hygrometers:
  Five “J” type temperature sensors (dry buld).
  Five “J” type temperature sensors (wet bulb).
• Three temperature sensors, placed in the refrigeration circuit:
  “J” type temperature sensor (evaporator inlet).
  “J” type temperature sensor (evaporator outlet).
  “J” type temperature sensor (condenser outlet).
• Flow meter for refrigerant flow measurement, range: 5 – 60 l/min.
  With the trapdoor we can adjust the percentage of recirculating air.
  Psychrometric chart and enthalpy diagram of R-513a.
  This unit has been designed for the use with the refrigerant R-513a, CFC-free, environmental friendly.
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Specifications

• Electronic console:
  Metallic box.
  Temperature sensors connections.
  Selector for temperature sensors.
  Digital display for temperature sensors.
  Heating elements temperature controls.
  Compressor switch.
  Fan regulator.
  High pressure control connection.
  Main switch.
  Cables and accessories, for normal operation.