Metrics Stern Flaps have shown a fuel savings of 3.4% (2,000 – 4,900 bbl/ship/yr) depending on class.
What is it?
A Stern Flap is an extension of the hull bottom surface which extends aft of the transom. It is a relatively small steel plate appendage that is welded to the transom.
How does it work?
Stern Flaps modify the flow field under the hull afterbody, decreasing flow velocity and increasing pressure, resulting in reduced drag, reduced turbulence, and thus, reduced hull resistance.
What will it accomplish? Stern Flaps have been proven, at sea, to increase propulsion efficiency and reduce exhaust emissions to foster significant fuel cost savings while increasing both ship speed and range. Stern Flaps decrease the strain on main engines, decrease propeller loading, cavitation, vibration and noise, and thereby increase the interval between engine overhauls and extend the service life of the propulsion machinery.
Applications
Stern Flaps are currently installed (or being installed) on Cruisers (CG 47 Class), Destroyers (DDG 51 Class), and certain amphibious ships (LPD 4/17 Classes, LHD 1 Class, and LSD 41/49 Classes).
For More Information Contact via NAVSEA Public Affairs at (202) 781.4123 or [email protected]
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Metrics
Estimated savings are dependent on types, and number of lighting fixture replacements, up to: - 0.6% (485 bbls) per DDG - 0.1 - 0.2% (300 bbls) per LSD/LHD
What is it?
Light Emitting Diodes (LED) are replacements for incandescent and fluorescent lighting fixtures. SSL lamps are arrays of individual LEDs producing light at the same quality and brightness as legacy lamps with an increased lifespan.
How does it work? All SSL replacements are engineered to meet military specification for lighting (MIL-DTL-16377) and are in the process of being qualified for shipboard use. Incandescent and berth lights will be replaced with fixture-form-fit-function SSL bulbs, and legacy fluorescent tubes will be replaced with SSL tubes.
What will it accomplish? SSL improves energy efficiency, saves fuel at-sea and saves shore power in-port. SSL also improves lamp lifespan, and drives down maintenance and sparing costs. Removal of mercury- containing fluorescent tubes drives down handling and storage costs.
Applications LED replacements, general illumination and task-specific lighting throughout Navy Ships.
For More Information Contact via NAVSEA Public Affairs at (202) 781.4123 or [email protected]
Website: http://greenfleet.dodlive.mil/energy Facebook: http://facebook.com/navalenergy Twitter: http://twitter.com/navalenergy