VIDEO: Energy saving retrofit cuts passenger vessel fuel consumption by 24% :
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VIDEO: Energy saving retrofit cuts passenger vessel fuel consumption by 24% :

Energy-saving retrofits are commonplace on large cargo vessels and cruise ships.


Energy-saving retrofits are commonplace on large cargo vessels and cruise ships. But can they also make a significant difference on a small passenger vessel? Lausanne, Switzerland, headquartered CGN, which operates a fleet of 19 passenger vessels on Lake Geneva, decided to find out. As a test case, the company selected the 30 meter, 200-passenger passenger vessel Valais, which was built in 2008, and which makes up to 40 crossings a day between Yvoire (France) and Nyon (Switzerland.

“We selected the 30 meter passenger ship Valais and commissioned a ship optimization study by means of Computational Fluid Dynamics software, comparing several possible hydrodynamic improvements at our operating speed of 25 km/h” says Irwin Gafner, technical director at CGN. “In the study, the benchmark hull (which has a trim wedge) was compared to various retrofit alternatives for the stern, such as ducktail extensions, interceptors (a vertical blade protruding below the transom) and a Hull Vane, which is a rather novel solution and can be described as a ‘spoiler for ships.’ The best alternative to come out of this optimization was the Hull Vane, promising a resistance reduction of 15%. We also asked to optimize a bulbous bow for the ship with Hull Vane.”

After the hydrodynamic study, CGN Technique ordered the Hull Vane from Wageningen, Netherlands, based Hull Vane B.V. and the bulbous bow from a local subcontractor. Lake trials were performed before drydocking, in which accurate measurements were made of the ship’s fuel consumption. During the scheduled dry dock period, at the CGN Technique facilities in Lausanne, both devices were installed, and the main engines were replaced with new common-rail V8 MAN engines. After launching of the vessel, ballast was added in the bow to bring the vessel to the appropriate draft.

The data is compiled from : www.marinelog.com



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