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Cooling Cycle
The refrigeration cycle of the
CVGF chiller can be described
using the pressure-enthalpy
diagram shown in Figure 3. Key
state points are indicated and
will be referred to in the
following discussion. A
schematic of the system
showing refrigerant flow is given
in Figure 4.
CVGF-SVU02B-E4
General
Information
Evaporator - A liquid vapor
refrigerant mixture enters the
evaporator at state point 1.
Liquid refrigerant is vaporized to
state point 2 as it absorbs heat
from the system cooling load.
The vaporized refrigerant flows
into the compressor first stage.
Figure 3. P-H chart
P
Pc
5
P
1
8
1
Pe
Compressor first stage -
Refrigerant vapor is drawn from
the evaporator into the first
stage compressor. The first stage
impeller accelerates the vapor
increasing its temperature and
pressure to state point 3.
Condenser
Economizer
Evaporator
2
RE
1
RE
4
Compressor
2nd stage
3
Compressor
1st stage
H
7
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