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Simple Refrigeration Laboratory Unit (SMT-RAC-14)
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
2 manometers with temperature scale for the
refrigerant show the values of the refrigerant on the
high and low pressure sides.
2 water-filled tanks with thermometer to
demonstrate the cooling and heating effect.
Pressure switch to protect the compressor
Sight glass to monitor the aggregate state of the
Refrigerant R134a, CFC-free.
The purpose of a refrigeration system is the cooling of materials and products, e.g. to protect
food from spoiling. Cooling can be described as a process in which heat is removed from the
environment. A 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 pump.