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Large Tonnage ChillerWC Screw
Content• Mechanical System
• Key Components
• Control Logic
• Application
2
Mechanical System
3
Layout
4
Control PanelScrew Compressor
Shell & Tube Condenser Cooling water inlet/outlet conn. & Temp. sensor
Refrigerant System
5
DX PID
6
Flooded PID
Key Components
7
Condenser
H2O
R134a
R134a
Tube
High Efficiency Sub-cooler
• Compact and high-efficient sub-cooler • Low-liquid flash design requires less refrigerant• Control the liquid level accurately to ensure 4.5C sub-cooling
Cold liquid outSubcooler
High temperature gas in
Condenser
Condenser
Condenser
Oil Sep.
Evaporator
R134a
Water
Water
DX type
Evaporator
H2O
R134a
R134aFlooded type
Evaporator
H2O
R134a
R134aFull Falling Film type
Evaporator
Flooded Falling Film
40%
• Reduce 40% of refrigerant charge
• Improved performance of oil return and heat transfer
Full Falling Film
25%
Oil system
16
Gas jet
Oil System
The Venturi effect is the reduction in fluid pressure that results when a fluid flows through a constricted section of pipe， with the static pressure correspondingly decreasing .
Sound Velocity
Velocity
Pressure
Oil jet
Oil pump
Oil System
Gas jet Oil jet Oil pump
Features
Vacuum 50 ~ 80kPa;
Low gas pressure drop;
Low price; Piping design
complicated.
Vacuum 12 ~ 20kPa;
High oil pressure drop, up to 50%;
Low price; Piping design
complicated.
Best stability of oil return;
High price; Piping design
simply.
Oil System
Micro processer
MIC PLC
Price Cheap Expensive
Function The same
Failure rate 1/10 of PLC -
Maintenance Just replace it. Replace it. Not only it, but also the modular;
Control Logic
22
Start up
23
YES
Stop
24
Applications
25
Ice/Water storage
26
Series System
Parallel System
Storage
Storage
EVA
HR
COND EEV
45℃40℃
35℃30℃
7℃12℃
Heat recovery
Note：The highest HR LWT is 60 ℃ , the higher EWT, the less HR.
Heat pump
28
Note:Cooling: A on, B off;Heating: A off, B on.
Comp
Flooded EVA
COND
Pump
Pump
Surface water system
FCU
Heat pump
29
Note:Cooling: A on, B off;Heating: A off, B on.
Comp
Flooded EVA
CONDPump
Pump
Ground Source
FCU
30
31
Thank You!
