ejectors Applications advantages: - simple way to create a vacuum - safe and reliable - no moving Parts, nearly maintenance free - relatively unexpensive (the condensers are expensive) - corossion resistant materials available disadvantages: - contamination with/of motive fluid Capacity: nearly no limitation and two or more ejectors can be arranged in parallel. Vacuum: A single stage operating alone will produce pressures in the range of about 50 - 100 mbarA up to atmospheric pressure. Two stages will produce pressures between 10 mbarA and 100 mbarA, while three stages will produce between 1 mbarA and 30 mbarA. Croll-Reynolds vacuum system with surface type condensers Körting: vacuum system with spray condensers, two stages without inter-condenser spray condensers with barometric legs 4th stage as a lquid ring vacuum pump

Ejectors - FAQ's vacuum ejector manufacturers vacuum condenser manufacturers Links HEI Steam Jet Vacuum Systems Troubleshooting Guide Designing Steam Jet Vacuum Systems Condensers Barometric (Direct Contact) Condensers The condensing medium (cold water) is in direct contact with the vapour. The amount of cold water required is calculated from an energy balance around the condenser Condenser Rapid Design (http://www.sugartech.co.za/rapiddesign/condenser/index.php) GEA Jet pumps Terminology: compression ratio (K) = discharge pressure divided by suction pressure. (Both pressures have to be expressed in consistent, absolute pressure units.) expansion ratio (E) = motive pressure divided by suction pressure. (both pressures have to be expressed in consistent, absolute pressure units.) Flow ratio = suction flowrate divided by motive flowrate (both are expressed in consistent mass terms.)