Oil-free compression rotary screw compressors with integrated compressed air dryer

i.HOC – Outstandingly efficient compressed air drying

The patented i.HOC rotary dryer from Kaeser uses up to 100 % of compressor heat! Thanks to full-flow regeneration, it delivers reliable pressure dew points up to an ambient temperature of 45 °C – completely without electrical heating or additional cooling of the regeneration air!

  • Installed in air-cooled or water-cooled units
  • Unit rated power from 37 kW to 200 kW
  • Unit flow rates from 3.3 m³/min to 30 m³/min
  • Integrated SIGMA CONTROL 2 compressor controller (SFC model versions)

Your advantages

  • Sub-zero pressure dew points even in high ambient temperatures:
    Thanks to its extraordinary regeneration potential, the i.HOC delivers below-zero pressure dew points even with high cooling medium temperatures.
  • Pressure dew point stability even with variable flow rates:
    The pressure dew point remains stable even with low compressor load – no partial-load compensation required.
  • Effective drying AND heat recovery:
    i.HOC uses the heat exchangers of the second compression stage, which have been optimised for heat recovery, as regeneration air coolers.

Life-cycle costs

Optimal consulting, technically advanced research and development and a global service organisation protect you from system failures.

 

The oil-free compression rotary screw compressors with integrated i.HOC or refrigeration dryer in detail

Various drying technologies

Integrated refrigeration dryer

Even for oil-free compression rotary screw compressors, refrigeration dryers are the go-to choice for delivering best possible energy efficiency and favourable investment cost when requiring pressure dew points to +3 °C. Pressure dew points below +3 °C are provided by desiccant dryers.

Integrated i.HOC rotation dryer

The optional i.HOC rotation dryer for integration in the rotary screw compressor can reliably and efficiently achieve pressure dew points as low as -30 °C. The hot compressed air from the second compression stage is used to regenerate the desiccant.

i.HOC superior full-flow regeneration
i.HOC with KAESER full-flow regeneration
 Full-flow regeneration  Partial-flow regeneration
 Regeneration area: Hot air removes moisture from the desiccant.
 Drying area: Moisture is drawn into the desiccant from the cold air.

The i.HOC (Integrated Heat of Compression Dryer) system uses 100 % of the heat of compression from the second compression stage for drying purposes (full-flow regeneration). This heat, which is produced in any case, is therefore effectively available at zero cost.

  • No additional energy input for the drying process
  • Higher regeneration potential than with partial-flow regeneration dryers
  • Full performance, even with low compressor load

The advantages of full-flow regeneration become obvious, especially with increased coolant temperatures. Kaeser rotary dryers achieve outstanding drying results even without additional electric heating of the regeneration air.

Integrated refrigeration dryer

Energy-saving drying

Integrated design, together with the generously-dimensioned aluminium block heat exchanger, helps ensure minimal pressure loss of less than 0.1 bar. The energy-saving scroll refrigeration compressor helps achieve additional compressed air energy savings.

Excellent accessibility

All refrigeration dryer components are perfectly accessible via the service door on the front of the unit. Dryer service and maintenance work is therefore a breeze.

View inside the integrated rotary dryer
i.HOC rotation dryer installation diagram
  1. Regeneration air inlet
  2. Regeneration air outlet
  3. Condensate separation
  4. Radial fan inlet
  5. i.HOC outlet
i.HOC in detail
i.HOC – Cross-section and components
  1. Regeneration air inlet
  2. Drum (silica gel desiccant)
  3. Regeneration air outlet
  4. Heat exchanger stage 2
  5. External condensate separator
  6. Radial fan
  7. Demister (droplet separator)
  8. Rotation dryer outlet
  9. Drum motor
  10. Pressure dew point sensor (optional)
Technical specifications DSG-2 W

Standard version

ModelDSG 140-2 W DSG 180-2 W DSG 220-2 W
Working pressure bar 8 10 4 6 8 10 4 6 8 10
Flow rate Complete system at working pressure m³/min 13.18 13.12 21.7 19.2 18.4 16.1 26.15 23 21.6 19.1
Max. positive pressure bar 8 10 4 6 8 10 4 6 8 10
Nominal motor output kW 90 110 132
Dimensions W x D x H mm 3,435 x 1,750 x 2,060 3,435 x 1,750 x 2,060 3,435 x 1,750 x 2,060
Compressed air connectionDN80 PN16 DIN DN80 PN16 DIN DN80 PN16 DIN
Sound pressure level dB(A) 69 70 71
Weight kg 3,100 3,250 3,350

ModelDSG 260-2 W DSG 290-2 W
Working pressure bar 4 6 8 10 4 6 8 10
Flow rate Complete system at working pressure m³/min 28.61 26.1 26 22.9 28.6 28.55 28.5 26
Max. positive pressure bar 4 8 10 8 10
Nominal motor output kW 160 200
Dimensions W x D x H mm 3,435 x 1,750 x 2,060 3,435 x 1,750 x 2,060
Compressed air connectionDN80 PN16 DIN DN80 PN16 DIN
Sound pressure level dB(A) 74 75
Weight kg 3,500 3,700

SFC version

ModelDSG 180-2 SFC W DSG 220-2 SFC W
Working pressure bar 4 6 8 10 4 6 8 10
Flow rate Complete system at working pressure m³/min 8.58 - 22.52 9.46 - 20.79 8.51 - 18.56 9.54 - 16.43 7.84 - 22.51 8.68 - 22.45 9.51 - 21.8 9.95 - 19.5
Max. positive pressure bar 6 10 8.5 10
Nominal motor output kW 110 132
Dimensions W x D x H mm 3,435 x 1,750 x 2,060 3,435 x 1,750 x 2,060
Compressed air connectionDN80 PN16 DIN DN80 PN16 DIN
Sound pressure level dB(A) 71 72
Weight kg 3,850 3,950

ModelDSG 260-2 SFC W DSG 290-2 SFC W
Working pressure bar 4 6 8 10 4 6 8 10
Flow rate Complete system at working pressure m³/min 8.59 - 27.71 9.36 - 27.66 9.62 - 25.44 10.3 - 23.3 9.07 - 30.09 10.27 - 30.05 11.47 - 30 12.33 - 28
Max. positive pressure bar 7 10 8.5 10
Nominal motor output kW 160 200
Dimensions W x D x H mm 3,435 x 1,750 x 2,060 3,435 x 1,750 x 2,060
Compressed air connectionDN80 PN16 DIN DN80 PN16 DIN
Sound pressure level dB(A) 75 76
Weight kg 4,100 4,300

RD version

ModelDSG 140-2 RD W DSG 180-2 RD W DSG 220-2 RD W
Working pressure bar 8 10 6 8 10 6 8 10
Flow rate Complete system at working pressure m³/min 13.18 13.12 19.2 18.4 16.1 23 21.6 19.1
Max. positive pressure bar 8 10 6 8 10 6 8 10
Nominal motor output kW 90 110 132
Pressure dew point °C -32 -36 -24 -33 -36 -24 -33 -36
Dimensions W x D x H mm 4,270 x 1,750 x 2,060 4,270 x 1,750 x 2,060 4,270 x 1,750 x 2,060
Compressed air connectionDN80 PN16 DIN DN80 PN16 DIN DN80 PN16 DIN
Sound pressure level dB(A) 69 70 71
Weight kg 4,200 4,350 4,450

ModelDSG 260-2 RD W DSG 290-2 RD W
Working pressure bar 6 8 10 6 8 10
Flow rate Complete system at working pressure m³/min 26.1 26 22.9 28.55 28.5 26
Max. positive pressure bar 8 10 8 10
Nominal motor output kW 160 200
Pressure dew point °C -25 -33 -36 -24 -33 -36
Dimensions W x D x H mm 4,270 x 1,750 x 2,060 4,270 x 1,750 x 2,060
Compressed air connectionDN80 PN16 DIN DN80 PN16 DIN
Sound pressure level dB(A) 74 75
Weight kg 4,600 4,800

RD SFC version

ModelDSG 180-2 RD SFC W DSG 220-2 RD SFC W
Working pressure bar 6 8 10 6 8 10
Flow rate Complete system at working pressure m³/min 9.46 - 20.79 8.51 - 18.56 9.54 - 16.43 8.68 - 22.45 9.51 - 21.8 9.95 - 19.5
Max. positive pressure bar 6 10 8.5 10
Nominal motor output kW 110 132
Pressure dew point °C -24 -32 -36 -25 -33 -36
Dimensions W x D x H mm 4,270 x 1,750 x 2,060 4,270 x 1,750 x 2,060
Compressed air connectionDN80 PN16 DIN DN80 PN16 DIN
Sound pressure level dB(A) 71 72
Weight kg 4,950 5,050

ModelDSG 260-2 RD SFC W DSG 290-2 RD SFC W
Working pressure bar 6 8 10 6 8 10
Flow rate Complete system at working pressure m³/min 9.36 - 27.66 9.62 - 25.44 10.3 - 23.3 10.27 - 30.05 11.47 - 30 12.33 - 28
Max. positive pressure bar 7 10 8.5 10
Nominal motor output kW 160 200
Pressure dew point °C -25 -33 -36 -25 -33 -36
Dimensions W x D x H mm 4,270 x 1,750 x 2,060 4,270 x 1,750 x 2,060
Compressed air connectionDN80 PN16 DIN DN80 PN16 DIN
Sound pressure level dB(A) 75 76
Weight kg 5,200 5,400

Technical specifications DSG-2 A

Standard version

ModelDSG 140-2 A DSG 180-2 A DSG 220-2 A
Working pressure bar 8 10 4 6 8 10 4 6 8 10
Flow rate Complete system at working pressure m³/min 13.18 13.12 21.7 19.2 18.4 16.1 26.15 23 21.6 19.1
Max. positive pressure bar 8 10 4 6 8 10 4 6 8 10
Nominal motor output kW 90 110 132
Dimensions W x D x H mm 3,435 x 1,750 x 2,385 3,435 x 1,750 x 2,385 3,435 x 1,750 x 2,385
Compressed air connectionDN80 PN16 DIN DN80 PN16 DIN DN80 PN16 DIN
Sound pressure level dB(A) 77 78 78
Weight kg 3,400 3,550 3,650

ModelDSG 260-2 A DSG 290-2 A
Working pressure bar 4 6 8 10 4 6 8 10
Flow rate Complete system at working pressure m³/min 28.61 26.1 26 22.9 28.6 28.55 28.5 26
Max. positive pressure bar 4 8 10 8 10
Nominal motor output kW 160 200
Dimensions W x D x H mm 3,435 x 1,750 x 2,385 3,435 x 1,750 x 2,385
Compressed air connectionDN80 PN16 DIN DN80 PN16 DIN
Sound pressure level dB(A) 79 81
Weight kg 3,800 4,000

SFC version

ModelDSG 180-2 SFC A DSG 220-2 SFC A
Working pressure bar 4 6 8 10 4 6 8 10
Flow rate Complete system at working pressure m³/min 8.58 - 22.52 9.46 - 20.79 8.51 - 18.56 9.54 - 16.43 7.84 - 22.51 8.68 - 22.45 9.51 - 21.8 9.95 - 19.5
Max. positive pressure bar 6 10 8.5 10
Nominal motor output kW 110 132
Dimensions W x D x H mm 3,435 x 1,750 x 2,385 3,435 x 1,750 x 2,385
Compressed air connectionDN80 PN16 DIN DN80 PN16 DIN
Sound pressure level dB(A) 79 79
Weight kg 4,150 4,250

ModelDSG 260-2 SFC A DSG 290-2 SFC A
Working pressure bar 4 6 8 10 4 6 8 10
Flow rate Complete system at working pressure m³/min 8.59 - 27.71 9.36 - 27.66 9.62 - 25.44 10.3 - 23.3 9.07 - 30.09 10.27 - 30.05 11.47 - 30 12.33 - 28
Max. positive pressure bar 7 10 8.5 10
Nominal motor output kW 160 200
Dimensions W x D x H mm 3,435 x 1,750 x 2,385 3,435 x 1,750 x 2,385
Compressed air connectionDN80 PN16 DIN DN80 PN16 DIN
Sound pressure level dB(A) 80 82
Weight kg 4,400 4,600

RD version

ModelDSG 140-2 RD A DSG 180-2 RD A DSG 220-2 RD A
Working pressure bar 8 10 6 8 10 6 8 10
Flow rate Complete system at working pressure m³/min 13.18 13.12 19.2 18.4 16.1 23 21.6 19.1
Max. positive pressure bar 8 10 6 8 10 6 8 10
Nominal motor output kW 90 110 132
Pressure dew point °C -34 -36 -26 -33 -36 -26 -33 -35
Dimensions W x D x H mm 4,270 x 1,750 x 2,385 4,270 x 1,750 x 2,385 4,270 x 1,750 x 2,385
Compressed air connectionDN80 PN16 DIN DN80 PN16 DIN DN80 PN16 DIN
Sound pressure level dB(A) 77 78 78
Weight kg 4,500 4,650 4,750

ModelDSG 260-2 RD A DSG 290-2 RD A
Working pressure bar 6 8 10 6 8 10
Flow rate Complete system at working pressure m³/min 26.1 26 22.9 28.55 28.5 26
Max. positive pressure bar 8 10 8 10
Nominal motor output kW 160 200
Pressure dew point °C -25 -32 -34 -24 -31 -33
Dimensions W x D x H mm 4,270 x 1,750 x 2,385 4,270 x 1,750 x 2,385
Compressed air connectionDN80 PN16 DIN DN80 PN16 DIN
Sound pressure level dB(A) 79 81
Weight kg 4,900 5,100

RD SFC version

ModelDSG 180-2 RD SFC A DSG 220-2 RD SFC A
Working pressure bar 6 8 10 6 8 10
Flow rate Complete system at working pressure m³/min 9.46 - 20.79 8.51 - 18.56 9.54 - 16.43 8.68 - 22.45 9.51 - 21.8 9.95 - 19.5
Max. positive pressure bar 6 10 8.5 10
Nominal motor output kW 110 132
Pressure dew point °C -26 -33 -36 -26 -32 -35
Dimensions W x D x H mm 4,270 x 1,750 x 2,385 4,270 x 1,750 x 2,385
Compressed air connectionDN80 PN16 DIN DN80 PN16 DIN
Sound pressure level dB(A) 79 79
Weight kg 5,250 5,350

ModelDSG 260-2 RD SFC A DSG 290-2 RD SFC A
Working pressure bar 6 8 10 6 8 10
Flow rate Complete system at working pressure m³/min 9.36 - 27.66 9.62 - 25.44 10.3 - 23.3 10.27 - 30.05 11.47 - 30 12.33 - 28
Max. positive pressure bar 7 10 8.5 10
Nominal motor output kW 160 200
Pressure dew point °C -25 -31 -34 -24 -30 -33
Dimensions W x D x H mm 4,270 x 1,750 x 2,385 4,270 x 1,750 x 2,385
Compressed air connectionDN80 PN16 DIN DN80 PN16 DIN
Sound pressure level dB(A) 80 82
Weight kg 5,500 5,700