large tonnage chiller wc screw. content mechanical system key components control logic application 2
TRANSCRIPT
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Large Tonnage ChillerWC Screw
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Content• Mechanical System
• Key Components
• Control Logic
• Application
2
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Mechanical System
3
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Layout
4
Control PanelScrew Compressor
Shell & Tube Condenser Cooling water inlet/outlet conn. & Temp. sensor
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Refrigerant System
5
DX PID
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6
Flooded PID
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Key Components
7
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Condenser
H2O
R134a
R134a
Tube
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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
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Condenser
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Condenser
Oil Sep.
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Evaporator
R134a
Water
Water
DX type
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Evaporator
H2O
R134a
R134aFlooded type
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Evaporator
H2O
R134a
R134aFull Falling Film type
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Evaporator
Flooded Falling Film
40%
• Reduce 40% of refrigerant charge
• Improved performance of oil return and heat transfer
Full Falling Film
25%
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Oil system
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Gas jet
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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
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Oil jet
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Oil pump
Oil System
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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
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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;
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Control Logic
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Start up
23
YES
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Stop
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Applications
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Ice/Water storage
26
Series System
Parallel System
Storage
Storage
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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.
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Heat pump
28
Note:Cooling: A on, B off;Heating: A off, B on.
Comp
Flooded EVA
COND
Pump
Pump
Surface water system
FCU
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Heat pump
29
Note:Cooling: A on, B off;Heating: A off, B on.
Comp
Flooded EVA
CONDPump
Pump
Ground Source
FCU
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Thank You!