Filter
Top Products
TRG-TRC012-EN 9
period one
Components
notes
operation and is, therefore, constantly moving to lower pressure areas of the
chiller. In this system, oil flows in 2 distinct paths, each performing a separate
function: 1) bearing lubrication and cooling and 2) rotor oil injection.
Oil leaves the sump and passes through an oil filter and master solenoid valve.
The master solenoid valve is used to isolate the sump from the low-pressure
side of the system when the compressor is shut down, preventing oil migration.
The first path is for lubricating and cooling the compressor bearings ➀. Oil is
routed to the bearings located in the rotor and bearing housing. Each housing is
vented to the suction side of the compressor so that oil leaving the bearings is
routed through the rotors, to the oil separator, and then back to the oil sump.
The second path is for lubricating and sealing the compressor rotors ➁. Oil is
injected along the bottom or top of the compressor rotors inside the housing.
Its main purpose is to seal the rotor-to-rotor and rotor-to-housing clearances.
This seal provides a barrier between the high- and low-pressure cavities of the
compressor. Additionally, oil lubricates the male-to-female rotor drive
arrangement.
Condenser
The high-pressure refrigerant vapor, now stripped of oil droplets, leaves the oil
separator and continues on to the condenser.
In a water-cooled condenser, water is pumped through the tubes of this
shell-and-tube heat exchanger while refrigerant vapor fills the shell space
surrounding the tubes. The condenser has a baffle plate that helps distribute
the refrigerant evenly within the shell. As heat is transferred from hot, high-
pressure refrigerant vapor to the water, refrigerant condenses on the tube
surfaces.
The condensed liquid refrigerant then collects in the bottom of the shell where
the lower tubes are now submerged, resulting in further cooling, or subcooling,
of the refrigerant. This arrangement is called an integral subcooler.
water-cooled
Condenser
subcooler
subcooler
liquid
liquid
refrigerant
refrigerant
baffle
baffle
tube bundle
tube bundle
refrigerant vapor
refrigerant vapor
cooling
cooling
tower
tower
water
water
Figure 17