Operating and Maintenance Instructions - Chiller - Series EB 210 - EB 440
© Pfannenberg GmbH
Page 11 / 50
EN
3. Description of the chiller
Pfannenberg chillers are intended to cool down liquid for industrial applications. The frigorific circuit removes the
heat from the water and rejects the condensing power to the ambient through the air ventilation circuit. The unit is
comple
te of a hydraulic circuit with pump and atmospheric tank to pump the cold water to the user’s device and
back to the cooling circuit.
3.1. Design Concept
The chiller is a cooling unit that extracts heat from a liquid by means of a vapor compression refrigeration cycle.
3.2. Functional Diagram
Main components:
1
Compressor
2
Air cooled condenser with fan
3
Expansion valve
4
Evaporator
5
Pump
6
Tank
Refrigerant circuit
• The compressor (1) compresses the refrigerant under high pressure. The temperature increases.
• This heat is released to the ambient air in the condenser (2). The refrigerant liquefies.
• The condenser fan draws ambient air through the condenser (2) and releases it to the environment.
• A pressure drop occurs when the refrigerant passes through the expansion valve (3).
• Inside the evaporator (4), the refrigerant absorbs heat from the coolant and evaporates.
Hydraulic circuit
• The pump (5) supplies chilled coolant to liquid cooled components on the customer application.
• The coolant absorbs heat and runs back into the chiller.
• While passing the evaporator, the coolant dissipates heat to the refrigerant.
• The chilled coolant runs back into the tank where the hydraulic circulation starts again.
