Carrier 19 Series - Manual (Page 3)

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CAPACITY
{5COC) •SOCO) ^7000) kW
19 Series Centrifugals —
The ideal refrigeration cycle
BEARING AND SEAL
BEARING AND SEAL
VANE MOTOR
i I
REFRIGERANT VAPOR
tliiSfel REFRIGERANT LIQUID
REFRIGERANT LIQUID/VAPOR
SERVICE VALVE
Carrier centrifugals use refrigerant
(R-11, 114, 12 or 500) in a standard
compression, single- or two-stage
refrigeration cycle. System water in
the cooler is chilled as its heat is
transferred to refrigerant at low tem­
perature and pressure. As heat is re­
moved from the water, the refrig­
erant vaporizes and is drawn into the
compressor at a rate controlled by
the degree of the guide vane opening.
As the compressor raises the vapor
pressure, the saturation temperature
of the refrigerant rises above that of
the condenser water. Refrigerant
vapor is discharged directly into the
condenser, where relatively cool
condenser water removes heat from
the vapor, causing it to condense
again to liquid. The heated water
leaves the system, returning to a
cooling tower or other heat rejection
device. The liquefied refrigerant then
leaves the condenser, draining into
a chamber where a variable metering
device regulates refrigerant flow and
maintains a liquid seal to prevept
vapor from passing into the cooler.
As the refrigerant liquid goes thru
this metering device, part of it vapor­
izes because of reduced pressure,
cooling the remaining liquid to the
temperature at which the cycle
began.