Safety
Instructions
Product
Description
Installat
io
n
Electrical
Connection
Starting up &
Operation
Maintenance
& Repair
Dismantling &
Disposal
Condensing Unit For Refrigeration Networks
2.6.10 Liquid sub-cooler
Condensing units for low temperature applications are equipped with a liquid sub-cooler.
This heat exchanger is used to provide additional sub-cooling to the refrigerant before it
enters the evaporator. This sub-cooling provides a considerable cooling capacity
increase. During the sub-cooling process, a small amount of refrigerant is evaporated in
the liquid sub-cooler. It (sub) cools high-pressure refrigerant liquid that will be injected
into the evaporator. The small amount of evaporated refrigerant in the liquid sub-cooler is
injected into the compressor and provides additional cooling at higher compression ratios,
similar to liquid injection. The diagram below explains the refrigerant flows.
Since the liquid temperature can be as low as –15°C,
liquid line insulation
should be
applied to avoid freezing of water on the outside of the lines.
VI
LI
LO
VO
VO
=
V
apour
O
ut, vapour leaving to compressor injection
VI
=
V
apour
I
n, vapour interring the economiser
LO
=
L
iquid
O
ut, sub-cooled liquid leaving the economiser
LI
=
L
iquid
I
n, Liquid from condenser
Liquid sub-cooler characteristics:
Standard connection size = 1", Material EN 10272-1.4401 (AISI 316)
Brazing material = pure copper
C6.1.4/0305/E
11
Part no: 3136433
