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>>>centrifugal : lower freon piping system pressure than screw compressor ,gear box is needed , can be multistage , VFD by guide vans for controlling the velocity .
oil system consist of sensor and heater and oil cooled by Freon pipe and oil relief valve .
surge can happen in it if the evap. pressure is too low are the condenser pressure is too high .
max velocity3000 rpm
used in higher TR more than2000 TR
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>>>reciprocating : can be multistage , VFD by (block cylinder suction) or (suction valve lift).
oil system consist of sensor and heater and oil cooled by Freon pipe and oil relief valve .
use for lower TR up to750 TR
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>>>screw comp. : high Freon piping system pressure , VFD by (slid valve ) ,gear box is needed.
oil system consist of sensor and heater and oil cooled by Freon pipe and oil relief valve .
max velocity3600 rpm
used in intermediate loads
