Misplaced Pages

#768231

14-638: In peacetime, Deutsche Werft built merchant ships, such as the HAPAG turbo-electric cargo ships Antilla and Orizaba . In World War II Deutsche Werft built 113 Type IX and XXIII U-boats for the Kriegsmarine . To this end, it operated three camps directly on the company premises (the Deutsche Werft construction site camp, Deutsche Werft Finkenwärder camp and the Rüschkanal Eastern workers' camp),

28-441: A gas-turbine–electric primary transmission is used with a heat-recovery boiler in the exhaust flow to generate steam that drives a steam turbine that also generates electricity. Thus the system is thus even more efficient, as it converts what would normally be rejected as waste heat into useful power. COGES Combined gas and steam ( COGAS ) is a type of marine compound powerplant comprising gas and steam turbines ,

42-454: Is a stub . You can help Misplaced Pages by expanding it . Turbo-electric transmission A turbine–electric transmission system includes a turboshaft gas turbine connected to an electrical generator , creating electricity that powers electric traction motors . No clutch is required. Turbine–electric transmissions are used to drive both gas turbine locomotives (rarely) and warships . A handful of experimental locomotives from

56-447: Is called turboelectric propulsion. As gas and steam turbines are most efficient at thousands of revolutions per minute, when lower turbine speeds are needed in purely mechanical systems this necessitates extensive, and often heavy, reduction gearing. This is especially important on warship as they often require high electrical power independent of travel speed as well as the ability to perform efficient low speed cruise whilst maintaining

70-653: Is not intended to operate on one system alone. While this is possible, it will not operate efficiently this way, as with Combined diesel and gas systems when run solely on diesel engines. Especially COGAS should not be confused with Combined steam and gas (COSAG) power plants, which employ traditional, oil-fired boilers for steam turbine propulsion for normal cruising, and supplement this with gas turbines for faster reaction times and higher dash speed. COGAS has been proposed as upgrade for ships that use gas turbines as their main (or only) engines, e.g. in COGOG or COGAG mode, such as

84-495: The Arleigh Burke -class destroyers , but currently no naval ship uses this concept. However some modern cruise ships are equipped with COGES. E.g. Celebrity Cruises ' Millennium and other ships of her class use turbo-electric plants with two General Electric LM2500 + gas turbines and one steam-turbine. BMW is currently researching combined gas and steam for automotive use, using their turbosteamer system. This uses

98-400: The 1930s and 1940s used gas turbines as prime movers . These turbines were based on stationary practice, with single large reverse-flow combustors , heat exchangers and using low-cost heavy oil bunker fuel . In the 1960s the idea re-emerged, using developments in light weight engines developed for helicopters and using lighter kerosene fuels. As these turbines were compact and lightweight,

112-496: The ability to perform less efficient sprints. For that reason warships often use combined power systems where an efficient prime mover, such as a diesel engine or a small gas turbine, is used for cruising while large gas turbines can be activated for high speed. When such a system uses gearboxes and clutches to accomplish a mechanical combination of power they are referred to as CODOG ( combined diesel or gas ) or COGAG ( combined gas and gas ) respectively. This further increases

126-457: The complexity and size of the mechanical power transmission systems. Integrated electric propulsion systems offer the ability to simplify such systems by combining power electrically instead of mechanically. By discarding mechanical power transmission these systems can improve efficiency by allowing each system to operate at its most efficient speed, improve reliability by cutting down on the number of components, and simplify ship layout as without

140-558: The latter being driven by steam generated using the heat from the exhaust of the gas turbines. Combined diesel or gas (CODOG) Combined diesel and gas (CODAG) Combined diesel-electric and diesel (CODLAD) Combined diesel–electric and gas (CODLAG) Combined diesel and diesel (CODAD) Combined steam and gas (COSAG) Combined gas or gas (COGOG) Combined gas and gas (COGAG) Combined gas and steam (COGAS) Combined nuclear and steam propulsion (CONAS) Integrated electric propulsion (IEP or IFEP) In this way, some of

154-425: The need for direct mechanical linkages to the propellers engines can be placed optimally. And while turboelectric systems are often heavy compared to simple mechanical systems, they are similar in weight to the complex mechanical systems use to link different engines whilst generating electrical power. An extension of the standard turboelectric propulsion scheme is COGES , or combined gas–electric and steam. In COGES

SECTION 10

#1733086322769

168-494: The otherwise lost energy can be reclaimed and the specific fuel consumption of the plant can be decreased. Large (land-based) electric powerplants built using this combined cycle can reach conversion efficiencies of over 60%. If the turbines do not drive a propeller shaft directly and instead a turbo-electric transmission is used, the system is known as COGES (combined gas turbine-electric and steam). COGAS differs from many other combined marine propulsion systems in that it

182-410: The vehicles were produced as railcars rather than separate locomotives. Turboelectric powertrains are a subset of what is referred to in marine nomenclature as integrated electric propulsion or IEP where generated power is converted into electricity before being used to power propellers or pump-jets . Power can be provided by diesel engines , nuclear reactors , or gas turbines in which case it

196-565: Was involved in five camps in the Finkenwerder district and six in the port area, as well as nine camps in the city area. In addition, there were the camps at the Reiherstiegwerft shipyard, which also belonged to Deutsche Werft. In 1968 Deutsche Werft was merged and became part of Howaldtswerke-Deutsche Werft . This German corporation or company article is a stub . You can help Misplaced Pages by expanding it . This Hamburg -related article

#768231