Unique combined experience from two worlds

Relying on experience in the design and production of rotary lobe blowers since 1868 and screw compressors since 1943, Aerzen has continually set new standards for quality and innovation in the field of twin-shaft positive displacement machines.

This unique combined experience from the worlds of rotary lobe blowers and screw compressors is the foundation upon which the new groundbreaking and futureoriented Delta Hybrid technology has been developed – the first series of Rotary Lobe Compressors!

Delta Hybrid, the groundbreaking Rotary Lobe Compressor, is the result of a synergy between the rotary lobe blower and the screw compressor technologies and offers completely new possibilities for generating positive pressure or vacuum by combining the technical advantages of both concepts.

A total of 7 patents or patent applications currently make the Delta Hybrid one of the most innovative products in compression technology.

While low pressure applications call for the Roots-Principle of isochoric compression, the screw compressor, with its internal compression, becomes the preferred choice for its energy efficiency in higher pressure ranges. The package concept is based on the well known and successful Aerzen Delta design (Delta Blower and Delta Screw) and has been systematically upgraded.

Increasing energy efficiency and reduce costs

Over a ten year operating period, energy costs equate to about 90% of the total Life Cycle Costs of a compressor. With this in mind, the Delta Hybrid was developed with the focus on increasing energy efficiency and achieving a significant reduction of energy costs and greenhouse gas emissions.

The ideal union of both rotary lobe blower and screw compressor technologies resulted in the Delta Hybrid, a future-oriented innovation that reduces the energy consumption by up to 15% compared to usual compressors.

A 3+3 twisted rotor profile is used for low pressures up to 800 mbar (12 psi) whereas a 3+4 rotor profile is used for pressures up to 1500 mbar (22 psi): a compressor with optimum efficiency can be selected for the needed pressure range. Optimized fluidic design of inlet and discharge ports provides for ideal flow conditions and reduced slippage. The inlet air is sucked in on the cold side of the package and discharge silencer isolation helps maintaining a low inlet temperature, therefore increasing the compression efficiency. Moreover, the belt-driven Delta Hybrid offers the significant advantage of exact sizing the greatest advantage comes from the energy that does not need to be used. In other words, a 5% excess in volume flow corresponds to a 5 % higher energy use.

The new Delta Hybrid series is totally energetically comparable with turbo compressors, but through its customized design principle it also offers the serious advantages of a rotary piston engine.

Further measures that improve energy efficiency:

• Very wide flow control range from 25% to 100%
• Inlet cone that reduces pressure losses (patent pending)
• Optimal air flow within the acoustic enclosure, brings cool air to the intake side and increases compression efficiency
• Silencer without absorption material and with reduced pressure losses (patent pending)
• Shaft-driven or electric motor driven ventilation fan for the acoustic enclosure
• Special silencer insulation reduces the temperature within the acoustic enclosure and contributes to an increase of compression efficiency
• Highly efficient motors EFF1/IE2 motors (standard) or Premium Efficiency/IE3 motors (option)
• Power fluctuations even under varying inlet temperatures (summer/winter operation) are minimal compared to turbo compressors

Highest energy efficiency and lower Life Cycle Costs

Over a ten year operating period, energy costs equate to 90% of the total Life Cycle Costs (LCC); the actual equipment costs play a secondary role. With this in mind, the Delta Hybrid was developed with the focus on increasing energy effi ciency and achieving a signifi cant reduction of energy costs and greenhouse gas emissions:

• Innovative Rotary Lobe Compressor with new and optimized rotor profiles
• 15% higher energy efficiency
• Reduced package pressure losses
• Volume flow control range: 25 % up to 100 %
• Belt drive to exactly meet the performance requirements
• Reduced maintenance costs

Reliability and Durability

Following extensive field tests under harshest operating conditions and after over three years of operation in various applications, the Delta Hybrid-packages are ready for their market introduction. It was worth the effort:

• new seal solutions at the drive shaft and at the rotor chamber minimize the natural wear of the compressor stage
• new Aerzen patented bearing system extends the bearing life to over 60 000 operating hours (at a differential pressure of 1000 mbar [15 psi])
• As in previous generations, the Delta Hybrid features a purely reactive discharge silencer without absorption material

Low noise levels, without absorption material

Aerzen already set new low machine noise emission standards with its previous Delta Blower Generation 5. The same levels can of course be reached with the Delta Hybrid that is also characterized by further developments:

• new pulsation reduction in the compressor stage
• silencer without absorption materials (patent pending)
• additional insulation
• inlet cone to further reduce inlet noise (patent pending)
• optimized acoustic enclosure

Space saving, easy to use and reduced maintenance costs

• 
  Ease of transportation with hand truck or forklift truck
• Integrated service kit with motor lifting jack, filling funnel and first oil fill
• Space-saving design suitable for “side-by-side“ installation
• The front side is used for operation and maintenance
• Fully automatic and maintenance-free belt tension provided by hinged motor support base
• Oil level can be monitored from the outside during operation, without interrupting production
• Extension of oil change intervals to 16 000 operating hours (when using Aerzen oil Delta Lube). No need for a first oil change (for example after the first 500 O.H.)
• Increased bearing life to over 60 000 hours (at 1000 mbar [15 psi] differential pressure)

Expanded operating- and increased pressure range

• 
  Increased differential pressures to 1.5 bar (22 psi)
• Increased vacuum capability to -0,7 bar (- 21”Hg)
• Increased maximum allowable discharge temperature
• New rotor profiles optimized for pressure range efficiency
• High thermal stability