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Simple Refrigeration Laboratory Unit (SMT-RAC-14)
Touch LCD with GUI Interface for better monitoring and accurate measurement of Plant variables.
Fundamentals of refrigeration in a simplified model.
Typical compression refrigeration system with piston compressor, thermostatic expansion valve,
evaporator and condenser (each in the shape of a pipe coil).
Pressure switch to protect the compressor
Sight glass to monitor the aggregate state of the refrigerant.
Refrigerant R134a, CFC-free.
ESOLS DAQ Software for monitoring and control.
This Trainer used to demonstrate the commonly used refrigeration system is the so-called
compression refrigeration system. In this system refrigerant flows through four main
elements: compressor, condenser, expansion element and evaporator. The refrigeration
system uses the fact that the refrigerant has a low boiling point at low pressure. This means
that evaporation takes place on the low pressure side. During the evaporation of the
refrigerant heat is removed from the environment and it is cooled. The condensation takes
place on the high pressure side after the evaporator. Here the heat is discharged into the
environment. If not the cooling effect but the discharged heat is used, this is called a heat
In this setup Evaporator and condenser have been designed as a pipe coil with each end
immersed in a water-filled tank. The water simulates the environment. A thermostatic
expansion valve serves as expansion element. Two manometers indicate the two system
pressures on the high- and low-pressure sides. This allows for calculations of the amount of
heat removed from the environment (evaporator, cold water) and added to the environment
(condenser, hot water). A sight glass indicates the aggregate state of the refrigerant upstream
of the expansion valve.
The unit has Touch LCD display for visualization of process and the measurements. The Unit
is also connected to Software for computer connectivity and data analysis. The Touch screen
and computer software is included in the package.