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2. Function and main components
The chiller consists of the main components: compressor, condenser, expansion valve and
evaporator, which are arranged in a circuit (Figure 1). Refrigerant circulates in this circuit (cycle).
It absorbs heat from the cold water in the evaporator and gives it up to the ambient air in the
condenser.
Figure 1: C6848 refrigeration diagram
In addition, diverse pressure and temperature sensors, a control unit, a high-pressure switch, one
or more pumps and one or more fans are also installed for control and operation of the chiller.
2.1. Compressor
The compressor generates the pressure difference between the heat sink and heat source in the
refrigerant circuit needed for evaporation and condensing. Coolant vapor from the evaporator is
drawn in and compressed to the condensing pressure in the compressor.
The compressors used operate according to the scroll principle. Scroll compressors are
maintenance-free, quiet and have a very high efficiency.
The flow temperature is controlled by switching on or off one or more compressors (see 8.7.4
Compressor control). Sequential changeover ensures that all compressors are loaded uniformly.
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