GEA Bock HGZ7 - Manual (Page 12)

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The refrigerant suctioned out of the evaporator (21) is compressed by the 4 cylinders of the LP stage
(2) to intermediate pressure MP. After that, the superheated refrigerant flows through the intermediate
pressure chamber (3), where it is cooled by the liquid subcooler system to reduce the discharge end
temperature. The refrigerant then flows through the intermediate pressure line (4) to the electric
motor of the compressor for to cool the motor. After this, the refrigerant is suctioned in by the two HP
cylinders (5) and compressed to the final pressure.
Liquid subcooler system
The liquid subcooler system consists of the components
- liquid subcooler (plate heat exchanger) (6)
- expansion valve (7)
- sight glasses (8, 9)
- solenoid valve (10)
- filter drier (11)
After the refrigerant reciever (16), the liquid line will be splitted into two lines:
Line A leads through the liquid subcooler (6) and the subcooled refrigerant flows to the
evaporator (21). Through
Line B refrigerant is expanding through the expansion valve (7) into the
liquid subcooler (6) in order to subcool the refrigerant of line A and through the intermediate pressure
line (MP) to cool the superheated refrigerant, which is compressed from low pressure to intermediate
pressure chamber (3).
4| Description of functions