Compressor
·
Type:
The semi-hermetic twin screw compressor used in
Model SA liquid chillers has the advantage of hermetically
sealing the refrigerant and lubricating oil inside the compressor
while allowing technicians access to service and repair internal
moving parts.
·
Capacity Control:
Is achieved using a slide valve which
automatically modulates compressor capacity in 4 steps 25%,
50%, 75% and 100% with equivalent reductions in energy
consumption.
·
Compressor Starting:
The compressor starts fully unloaded
using the star-delta (Y/Δ) method to minimize starting current
inrush.
·
Compressor Characteristics:
Using the optimum screw
rotor profile and precision machining of all components
achieves minimum operating clearances to ensure the highest
volumetric and compression efficiency and minimum friction
and windage losses. The nodular cast iron compressor casing
encloses compressor, electric motor and oil separator in a
single accessible housing ensuring the minimum levels of noise
breakout and vibration. This rugged structure ensures stable and
reliable operation in ambient temperatures ranging from -15 to
+55˚c.
Cooler
All SA liquid chillers are fitted with a single cooler of the
•
“Flooded” shell and tube type having refrigerant in the shell
and chilled water inside the tubes. The shell is of welded alloy
steel construction with steel tube sheets and copper heat
exchange tubes. Removable steel water boxes at both ends
of the cooler allow tube cleaning without disturbing the
refrigerant circuit. Tubes are mechanically expanded into tube
sheets with double grooves to ensure leak tight and trouble
free operation. Multiple compressor/ circuit chillers have
coolers with separate refrigeration circuits for each compressor.
Each refrigeration circuit is provided with its own double safety
Specifications
System Flow Chart
Note: This is the flow chart of single refrigerant circuit type of air-cooled screw liquid chiller.
For multi refrigerant circuit chillers each compressor has its own separate circuit as above.
LS
Air-Cooled Water Chillers
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