Comparison Ejectors Vacuum pumps n n n Basic

Comparison Ejectors - Vacuum pumps n n n Basic design of an ejector Design of the complete system Example: comparison of air flow / energy consumption Comparison of different working principles Extract from „Druckluft effizient“

Basic design of an ejector 2 1 6 5 3 4 1 Compressed air 2 Nozzle 3 Suction pipe 4 Vacuum connection 5 Inlet filter 6 Exhaust air

Basic design of a multi-stage ejector (company PIAB) 1 Compressed air 2 Nozzles 3 Suction pipes 4 Vacuum connection

Complete system of an ejector Compressed-air reservoir Oil separator Compressor 6 bar Cooling dryer Ejector Inlet Filter

Complete system of an ejector n n n The ejector has no energy consumption The compressor has a very high energy consumption (Compressed air is expensive energy) The ejector is maintenance-free The compressor station is very maintanance-intensive (Most common are oil-lubricated screw-compressors with half-yearly maintenance) The ejector has no heat convection The compressor (often in separate room) has the heat convection. Also the exhaust air of the ejector affects its surrounding of the production machines Anyhow the vacuum pump can be installed in a separate room as well or the outgoing air can be ducted out of the machine

Complete system of the ejector n n n The ejector requires no space The compressor station requires much more space than the vacuum pump The ejector is oil-free The compressor is mostly oil-lubricated and the compressed air requires an intensive filtration (oil separator, cooling dryer) The exhaust air of the ejector is cold The cooling dryer cools the compressed air of the compressor, the exhaust air of a vacuum pump can be cooled by a heat exchanger as well

Complete system of the ejector n n n Ejectors do have a high efficency Compressed air is „expensive energy“ Refer to the comparison of the different working principles Ejectors have short evacuuation and reaction times The times of evacuation and reaction are much shorter with vacuum pumps Ejectors are very safe in operation The operating safety depends on the complete system, not only on the ejector

Example Ejector Type M 100 L (PIAB) Vacuum pumps Types KVT 3. 60 and VT 4. 16 (BECKER) BECKER KVT 3. 60 PIAB M 100 L BECKER VT 4. 16

Example: Comparison of air flow Ejector Type M 100 L (PIAB) Vacuum pumps Types KVT 3. 60 and VT 4. 16 (BECKER) Data from Becker data sheet Data from PIAB data sheet

Example: Comparison of air flow BECKER KVT 3. 60 50 Hz BECKER VT 4. 16 PIAB M 100 L

Example: Comparison of energy consumption Ejector Typ M 100 L (PIAB) Vacuum pumps Types KVT 3. 60 and VT 4. 16 (BECKER) Data from Becker data sheet Data from PIAB data sheet * 2, 5 l/s @ 6 bar compressed air = 1 KW (Reference: Internet Atlas Copco)

Example: Comparison energy consumption BECKER KVT 3. 60 50 Hz BECKER VT 4. 16 PIAB M 100 L

Example: Saving of energy Difference = Saving: (4, 8 - 0, 43) KW = 4, 37 KW x 0, 1 � / KWh* = 0, 44 � /h x 16 h / day** = 7, 04 � /day x 250 days / year = 1. 760 � /year * 1 KWh = 0, 1 � ** 2 -shift-operation

Comparison of different working principles Oil-free rotary-vane-vacuum pump VTLF 250 (Becker) Multi-stage sidechannel-vacuumpump COVAC 300 (Rietschle Thomas) 2 -stage Side channel vacuum pump SV 5. 690/2 (Becker) Ejector EJ V 864 (with 6 bar compressed air) (PIAB)

Comparison of different working principles Intake flow rate / Vacuum

Comparison of different working principles Power consumption / Vacuum

Comparison of different working principles Efficiency / Vacuum

The working group ”Druckluft effizient“ would like to inform plant engineers and users of compressed air about the possibilities to save costs and energy as well motivate the users to realize the potential savings. The different ways to optimize the technical applications of compressed air from the planing to processing and from distributing to and financing will be identified and then will be shown in so called ”fact sheets“. Additional informationen from: www. druckluft-effizient. de

Extract from the factsheet ”Applications“ of