约克变频离心机VSD..
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Enthalpy
Head Pressure
Pressure
Lowering condenser water temperature
Lowers head pressure
Condenser Head Pressure Evaporator Compressor
Reduces compressor work
Enthalpy
Head Pressure
Pressure
Lowering condenser water temperature
Lowers head pressure
Condenser Head Pressure Evaporator Compressor
Reduces compressor work
Hartford Weather
800 617
Annual Hours
732
706
710
85 678 80 75
F) ECWT (°
600 409 400 258 200 3 0 94-90 84-80 74-70 64-60 54-50 31 112
70 65 60 55 50
Dry-bulb Temperature Bins (° F)
85 678 80 75
F) ECWT (°
600 409 400 258 200 3 0 94-90 84-80 74-70 64-60 54-50 31 112
70 65 60 55 50
Dry-bulb Temperature Bins (° F)
Hartford Weather
800 85 80
Annual Hours
600
75
F) ECWT (°
70 400 65 200 60 55 0 94-90 84-80 74-70 64-60 54-50 50
Dry-bulb Temperature Bins (° F)
Hartford Weather
800 617
Annual Hours
732
Head Pressure
Pressure
Condenser
Compressor
Evaporator
Enthalpy
Head Pressure
Pressure
Condenser
Head Pressure
Compressor
Evaporator
Enthalpy
Head Pressure
Pressure
706
710
85 678 80 75
F) ECWT (°
600 409 400 258 200 3 0 94-90 84-80 74-70 64-60 54-50 31 112
70 65 60 55 50
Dry-bulb Temperature Bins (° F)
Hartford Weather
Variable Speed Drive Technology
Today’s Topics
• • • • • • • • How chillers operate How VSD works Energy comparison Features and benefits Harmonics Application Experience Evaluating chiller performance
Hartford Weather
800 617
Annual Hours
732
706
710
85 678 80 75
F) ECWT (°
600 409 400 258 200 3 0 94-90 84-80 74-70 64-60 54-50 31 112
70 65 60
99.2%
55 50
Dry-bulb Temperature Bins (° F)
Centrifugal Chiller
Impeller
Prerotation Vanes
Diffuser Plate Condenser Subcooler
Mist Eliminator Flooded Evaporator
Orifice
Pressure - Enthalpy Chart
Pressure
800 732 706 710 85 678 80 75
F) ECWT (°
Annual Hours
600
70 400 258 200 3 0 94-90 84-80 74-70 64-60 54-50 31 112 65 60 55 50
Dry-bulb Temperature Bins (° F)
Condenser Metering Device Evaporator
Refrigerant rejects heat to atmosphere
Compressor
Refrigerant absorbs heat from load
Enthalpy
Pressure - Enthalpy Chart
Condenser
Lowering condenser water temperature
Head Pressure
Compressor
Evaporator
Enthalpy
Head Pressure
Pressure
Condenser
Lowering condenser water temperature
Hale Waihona Puke BaiduPressure Cooling Tower
85 ° 95 °
54 ° 44 °
Enthalpy
Less than 1% of chiller run hours are at design full-load!
Hartford Weather
800 617
Annual Hours
732
706
710
Lowers head pressure
Head Pressure
Compressor
Evaporator
Enthalpy
Head Pressure
Pressure
Lowering condenser water temperature
Lowers head pressure
Condenser Head Pressure Evaporator Compressor
Enthalpy
Reduces energy consumption
Fan Laws
• RPM ~ CFM • RPM 2 ~ STATIC HEAD • RPM 3 ~ HP
RPM vs HP