15(45)
2. Structural Features and Working Principle
2.1 Main Functions
SIC-W air-cooled water chillers include consists of four main components, which
are compressor, condenser, thermostatic expansion valve, and evaporator. The
system adopts single-stage vapour compressed refrigeration system, which uses
refrigerant gas-liquid conversion to absorb and release heat, thus achieving the
cooling effect.
2.1.1 Working Principle
1. Compressor
2. Tube-in-shell condenser
3. Fudible plug
4. Drying filter
5. Liquid pipe solenoid valve
(optional)
6. Refrigerant indicator(optional)
7. Expansion valve
8. Evaporator
9. Anti-freezing switch
10. Flow switch (option)
11. Water level liquid indicator
(option)
12. Temp. sensor
13. Water tank
14. Float ball switch
15. Pump
16. Water pressure gauge
17. By-pass valve
18. Sluice valve (for middle and high
pressure pump)
19. Hot-gas by-pass valve (option)
20. Pressure controller
Picture 2-1：Working Principle Diagram
When the machine is started, compressor (1) starts working. Refrigerant is
compressed into high pressure and high temperature gas in the process from B to
C to enter the condenser 2 to exchange heat with the air, which changes from gas
to liquid and the heat is taken away by the air. In the C-D-E-F process, the liquid
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