GEA Bock HGZ Series - 4 Description of Functions

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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owsthroughtheintermediate
pressurechamber(3),whereitiscooledbytheliquidsubcoolersystemtoreducethedischargeend
temperature.The refrigerant then ows 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nal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)
-lter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 ows 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