Sea Technology

JUL 2013

The industry's recognized authority for design, engineering and application of equipment and services in the global ocean community

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for the Arleigh Burke-class destroyers. The modernization of the ship would generate signifcant fuel savings, but the overall advantages would stem from energy storage. The ability to use energy reserves generated from the new technology would enable modernization with advanced, power-hungry weapons systems. U.S. Navy sources indicate hybrid-electric drives will increase vessel mission effciency by allowing increased time at posts. Additionally, the dual-power solution has the potential to create more power for instruments and weapons. The Navy cites 9 percent in possible fuel gains when in propulsion mode using hybrid-electric drive (HED) propulsion, where the load is removed from the main gas turbines and placed onto the gas turbine generators. Adding propulsion-derived ship service, or PDSS, to the HED increases the gains to 12 to 15 percent. Saft Batteries provide river shuttles with power for reliable transport. (Middle) Industry vessels must adapt to meet efIndustry, Transportation Cost savings and improved function are not fciency demands. the only benefts of the hybrid propulsion ap- (Bottom) An electric boat near Corentin, France. plications. Workboats, leisure craft and passenger vessels are facing unprecedented emissions regulations. Recent revisions to the International Convention for the Prevention of Pollution from Ships (MARPOL) standards took hold in early 2013 with the goal of reducing sulfur oxides (SOx), nitrogen oxides (NOx) and CO2 greenhouse gas emissions from vessels by 30 percent by 2030. The amendments are designed to curtail original maritime vessel emissions estimates. If not reduced, the industry's portion of worldwide emissions will reach 18 percent. The development of hybrid propulsion systems has led to a range of advanced lithium-ion batteries specifcally designed for industrial and maritime applications. The battery serves as the main tool that works with the generators and motors as needed to deliver varying advantages. Lithium-ion batteries provide energy effciency of more than 95 percent and ultrahigh energy density of 116 watt-hours per liter. The long-life power sources also offer 6,000 cycles at 60 percent depth of discharge and a long calendar life upwards of 20 years (both at 20˚C). Most often rack-mounted, lithium-ion battery packages offer customizable solutions that meet power demands for hybrid vessels from kilowatts to megawatts. Saft (Bagnolet, France), a manufacturer of advancedtechnology batteries, is helping to lead the charge in the application of lithium-ion technology in hybrid propulfect opportunity to realize signifcant CO2 emissions reducsion systems. A new program aimed at reducing costs and tions and help port authorities achieve their environmental consumption while addressing environmental sustainabiltargets by interchanging with clean electric power. ity issues is making an impact in Bordeaux, France. Saft is Launched in November 2012, the two ferries are expected supplying advanced lithium-ion battery systems to provide to carry around 200,000 passengers and their bicycles annuquiet, effcient, low-emission power for two hybrid dieselally. Currently undergoing rigorous testing before entering electric ferryboats that operate a shuttle service across the service in the second quarter of 2013, the vessels will be the Garonne river. Ferries are ideal fts for the use of hybrid sysonly two ferry boats to be powered by lithium-ion batteries tems, as much of their daily operations consist of docking and diesel engines. Each ferry contains a 140-kilowatt-hour and undocking. This frequent port activity provides the perSaft battery made to provide power for propulsion, as well as www.sea-technology.com July 2013 / st 11

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