Carrier 19 Series User Manual

Page 3

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f 2SÎ U

"Carrier Offers Low Energy-Consumptiors Selections"

( 36;

■: 24;

22;

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s 18'

( 16) [—

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)20C0)

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(400C)

CAPACITY

{5COC)

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^7000) kW

19 Series Centrifugals —

The ideal refrigeration cycle

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.