10
Principle of Refrigeration System
The principle of compression refrigeration consists of “compression”, “con-
densation”, “throttling” and “vaporization”. The compression is undertaken by
compressor, the condensation is completed by condenser, the throttling valve
is executed by capillary and the vaporization is implemented by evaporator.
When the coolant is circulating in the closed refrigeration system, the compres-
sor sucks coolant, which has absorbs heat in evaporator, the coolant becomes
a high pressure and high temperature gas. In condenser, it dissipates heat in
air, while the coolant is re-liquefied and throttled in capillary and then enters
into evaporator with low pressure. The liquefied coolant quickly boils and
vaporizes into gas when the pressure suddenly drops. Meanwhile, it absorbs
heat inside the refrigerator. And the compressor sucks the low pressure and
low temperature gaseous coolant. It is circulating in this way up to realization
of intended refrigeration.
drying filter capillary device
gas
liquid
compressor
evapor
at
or
high pressure and high
temperature gas
low preasure gas
Circuit Diagram
Defrost
probe
Thermostat
probe
Display
panel
Digital temperature
controller
220-240~
50Hz
Fan mo-
tor
Lamp
Over Load
Protector
Compresor
PTC
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