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1.4.
Explanation of terms
For the sake of better understanding, we have listed some relevant terms that are used frequently in this
document.
Table 4: Explanation of terms
Term
Explanation
Application
The source of heat hydraulically connected to the chiller.
Process circuit
Application and piping to the chiller.
Cold water circuit
Process circuit and chiller in hydraulic piping.
Cold water
Refrigerant in cold water circuit.
Cooling air
Heat absorbing ambient air drawn through the machine.
Net weight
Machine ready for operation without cooling water.
Gross weight
Machine ready for operation with cooling water.
2.
Function and main components
The chiller consists of the main components compressor, condenser, expansion valve, evaporator, which are
arranged in a circuit (
Figure
2
). Refrigerant circulates in this circuit. In the evaporator, it absorbs heat from
the cold water and emits it in the condenser into the drawn in air.
Figure 2: 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.
Compressor
Condenser and fan
Evaporator
Expansion
valve
Heat
Cold
