SANY LATIN AMERICA
4-142
SY195/205/215/225C9 Crawler Hydraulic Excavator
Structure and Function
Shop Manual - June 2013
2. Refrigerant cycle
●
After evaporation in the evaporator, refrigerant turns from gas into liquid via the compressor
and the condenser, which
fi
nishes a refrigerant cycle.
●
Refrigerant cycle principle (pressure - enthalpy diagram)
lgp
h=u+Apv(kJ/kg)
Gas-liquid mixture
U
Internal energy
p
Pressure
V
Special volume A
Joule equivalent
Expansion throttle
Condensing process
Evaporating process
Compressing
process
Throttling point
Gasification completed
Liquefaction starts
Liquefaction completed
Expansion valve
Liquid
Evaporator
Compressor
Condensor
Refrigerant cyclic curve
Compressor
Intake
ė
Discharge
Evaporator
Absorb heat
ė
Emit cold air
Condensor
Via radiating:
Gas refri-
gerant
ė
Liquid refrigerant
Expansion valve
Hi pressure
ė
Lo pressure
Hi temp
ė
Lo temp
Liquid
ė
Mist
Compress HI press. side(outlet): HI temp\HI press.\Gas
Pressure/Temperature:
16Kg/cm²
ˈ
approx.
80
ć
Condensor (outlet)
˖
HI temp
?
HI pressure
?
Liquid
Compressor LO press. side (inlet): LO temp
?
LO press.
?
Gas
Pressure/Temperature:
2Kg/cm²
,
approx.
8
ć
Pressure/Tempterature
˖
16Kg/cm²
ˈ
Below
60
ć
Condensor (outlet): LO temp\LO press.\Mist
Pressure/Temperature:
2Kg/cm²
ˈ
approx.
0~2
ć
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