to fulfil the ECA requirements, i.e. the use of scrubber technology, the use of LNG as fuel and the use low-sulphur fuel/distillate. Te objective of the project is to set up practical solutions as well as uncovering the financial aspects regarding installation, operation and maintenance of the three alternatives. Te basis for the retrofit project is a newly built 38,500dwt tanker from D/S Norden A/S, and the project partners are expected to deliver results during 2011. In relation to the new projects as well
as the completed low emission studies, the Danish Maritime Fund has played an important role. Te original low emission studies were supported financially by the Danish Maritime Fund and since the research and development conducted within the ECA project is considered to be important to the business as a whole, the Danish Maritime Fund has decided to co-finance the project jointly with the partners.
Low-emission study of ferry Another new initiative is expected to be the low-emission study of a ro-pax ferry. Te focus will naturally be on elements within machinery and propulsion, but the plan is also to look at other areas affecting emissions. Te study will be performed on an existing ro-pax with an already known operational profile, making it possible to benchmark the emission reductions against existing data. Te overall target of the study is to achieve the same numerical goals as with the two previous studies, that is making companies work together on finding ways to reduce CO2
by 30%, and
NOx and SOx by 90%. Mr Schack said: “In the ferry study, we
are initiating new projects concerning HVAC, isolation, windows and lightning, but there might also be projects within looking at how the design of the cargo deck can decrease the loading time in port and thereby help decrease the overall ship speed at sea and still maintain schedules with a reduction of emissions as a result.”
New Green Ship projects Low-emission ship studies cover a wide range of projects. Below, two recently started projects are described. Firstly there is the Advanced CFD calculation
The Naval Architect January 2011 39
on Propeller and Rudder Bulb as a retrofit solution for a ro-pax ferry. By use of advanced Reynolds averaged
navier stokes (RANS) CFD, the flow in the stern region of the vessel is investigated. The flow study is made to optimise the interaction between the propeller, hull and rudder. Based on a complete 3D definition of the propulsion setup, the alignment of the rudder and brackets is checked. Based on the original settings with the propeller geometry included, different rudder bulbs are designed, and the overall performances are evaluated using RANS CFD. Further, a new propeller and hub design will be made and evaluated as well. Te project will be conducted by OSK ShipTech, MAN Diesel and Mols-linien.
Reduction of aerodynamic resistance Te second project’s aim is to reduce a ship’s
aerodynamic resistance and thereby reduce the fuel consumption. In this project, the handysize bulk carrier Seahorse 35 from Grontmij|Carl Bro is evaluated. With 7500kW installed power for the main propulsion and specific fuel oil consumption of 165g/kWh, the consumption is approximately 30tonnes of HFO/day or 9000tonnes at an operational profile of 300 sea days – so even a small percentage decrease of fuel consumption will have a noticeable effect on the ship’s yearly operational costs. Optimising the areas directly exposed to the wind can predictably reduce the ship’s aerodynamic resistance by approximately 30-40%. Tis gives an overall decrease in fuel consumption of 2-3%. Te project will be conducted by Grontmij|Carl Bro and FORCE Technology. Read more about Green Ship of the
Future and the different projects at
www.GreenShip.org . NA
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