Hanbell RC2-F Series, Manual

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Parallel compounding with common oil separator, water cooled oil cooler and oil pump
8.2 Economizer application
Economizer is an economical way to increase the system
’s cooling capacity and efficiency. Compare with using 2
compressors to achieve 2-stage compression, economizer achieves the same goal by subcooling liquid from the
condenser through a heat exchanger or flash tank before it goes to the evaporator. The subcooling is provided by
flashing liquid in the heat exchanger or flash tank and the flashing liquid vaporizes to an intermediate pressure
level. The intermediate pressure gas flows back to the ECO port then is injected to the compression chamber. The
power consumption of the compressor increases slightly compare to the additional work that takes place at a
better level of efficiency especially at high pressure ratio application.
HANBELL screw compressor can be fitted with an additional middle connection for economizer operation. With
this form of operation, refrigeration capacity and also system efficiency can be improved by means of a
sub-cooling circuit or two-stage refrigerant expansion. Based on HANBELL extensive research, a special design
of the Economizer connection has been developed so that the connection causes no additional back flow losses
during compression. As a result, compressor capacity is fully retained in all operating conditions. Please refer to
Hanbell selection software for the calculation of Economizer at different operating conditions.