ATENG 12904 — Heat Exchangers in the Refrigeration Unit
Experimental unit for the training of apprentices in the refrigeration area.
Anodized aluminum frame and panels made of stainless steel.
The unit includes wheels for its mobility.
Main metallic elements made of stainless steel.
Diagram in the front panel with distribution of the elements similar to the real one.
- Refrigeration system with four different heat exchangers:
Coaxial coil heat exchanger (condenser).
Finned tube heat exchanger (evaporator).
Plate heat exchanger (evaporator).
Tube heat exchanger (superheater).
- Different combinations of working fluids can be used:
Water / refrigerant.
Refrigerant / refrigerant.
Air / refrigerant.
- Water circuit consisting of:
Water storage tank.
Pump to impel water to cool the condenser and heat the evaporator.
- Two flow meters for the cooling and heating water. Range: 0 – 250 l/h. These mass flows, together with the inlet and outlet temperatures,
allow the student to calculate the exchanged energy fluxes.
The superheater can be disabled via bypass.
- Compressor:
- Refrigeration capacity: 1013 W at -5/32ºC
- Power consumption: 793 W at -10/32ºC
- Refrigerant receiver. Capacity: 1,5 l.
Two expansion valves.
Filter to remove impurities.
- Double pressure switch of 32/7,5 bar.
- A refrigerant flow meter. Range: 5 – 60 l/h.
- Thirteen temperature sensors at relevant points of the system:
Nine temperature sensors of range 0 – 60ºC.
One temperature sensor of range 0 – 100ºC.
Three temperature sensors of range -20 – 30ºC.
- Two manometers:
- Low pressure manometer in the intake side. Range: -1 – 10 Bar.
- High pressure manometer in the delivery side. Range: -1 – 30 Bar.
The unit has been designed to be used with environmental friendly CFC-free R134a refrigerant.
Enthalpy diagram of the R134a coolant.
- Electronic console:
Metallix box.
Temperature sensors connectors.
Digital display for the temperature sensors.
Selector for the temperature sensors.
Switch for the compressor.
High pressure control connection.
Cables and accessories, for normal operation.
