Norway-based DNV GL has launched a new service, Build2Design, which will allow shipyards and ship owners to improve their ships’ fuel economy by reducing variations during the construction process.
DNV GL maritime bulk carriers business director Michael Aasland said the company has compiled data that shows there is a large variation in fuel consumption between ships of the same design.
"This has led us to develop a new service, Build2Design, which aims at ensuring that the actual ship delivered is as good as its design," Aasland said.
While developing Build2Design, DNV GL listed around 20 parameters and analysed the complexity of addressing each parameter and its impact on fuel consumption.
The results show that the selection of the parameters will be design-specific, since the flow around the ship hull varies from design to design.
DNV GL Hydrodynamics head Dr Olav Rognebakke said Build2Design is based on a solid theoretical foundation combined with the latest technology, and uses advanced computational fluid dynamics (CFD) calculations to identify the factors that affect fuel consumption and their effects.
Aasland said they took a cost-benefit approach when selecting the parameters, so that the ship-owner would obtain the maximum benefit with the minimum impact on the shipyard.
"Just one of the parameters we are considering is the positioning and alignment of the bilge keel. Advanced CFD calculations show that a 0.5% reduction in resistance can be achieved by adjusting the position and angle," Aasland said.
The recent pilot project on the Green Dolphin 38 design showed that the new service helped save 2% of fuel, which was equivalent to a saving of 80t of fuel and $50,000 a year.
The Build2Design service is being rolled out this spring both through the Green Dolphin 38 pilot project for Goldenport at CSI Jiangsu, and the first commercial project based on a Seahorse 35 design for Graig Shipping at Jiangdong SY.
Image: The pilot project of Build2Design was carried out on SDARI Green Dolphin. Photo: courtesy of DNV GL AS.