Parallel systems with individual liquid subcoolers

A schema of an economised tandem compound with an individual liquid subcooler for each compressor is shown below (Economised tandem compound). Basically, the same guidelines apply as for single compressor configurations. No solenoid valves are required in the ECO suction gas lines. ECO operation for the compressors is activated and deactivated by the solenoid valve in the liquid line.

The individual liquid subcooler configuration is preferred, as it is easier to control compared to the common liquid subcooler (see below). Especially in operating conditions with relatively low part-load capacity, the flow velocities are still sufficient for ensuring oil return to the compressors.

ORBIT FIT: Schematic example of an economised tandem compound with individual liquid subcoolers
ORBIT FIT: Schematic example of an economised tandem compound with individual liquid subcoolers