By: Jeroen Berger, May 18, 2018 (updated)
Ruijven B.V., established in Werkendam (the Netherlands), has recently added a new and innovative inland waterway vessel (named Panerai I and II) to their increasingly more sustainable fleet. The main focus of this vessel was to build it as “green” as possible. We at Berger Maritiem has taken up the challenge to reduce the fuel consumption and CO2 footprint of the Panerai I (3,334 tonnes) and II (2,487 tonnes) together with our partners Orcan Energy AG and VICUSdt. This with regard to the high ambition of the Dutch cabinet to reach broad consensus on ways that the Netherlands can reduce its CO2 emissions by 49% by 2030.
Fuel consumption and CO2 footprint will be significantly reduced
An innovation on board of the Panerai I and II will be the use of two efficiency PACKS (waste heat recovery systems) from our German partner Orcan Energy AG (see figure 1). These systems will be installed and put into operation in the course of this year. With this technology Ruijven will use the waste heat from the exhaust gas and cooling water to generate mechanical energy (to support the powertrain). Although the efficiency PACK, based on the Organic Rankine Cycle’s principle, is something new for the inland waterway transport sector, waste heat recovery is longer used on deep sea operations and in electricity plants.
By applying an efficiency PACK on board of a vessel, savings on fuel costs are possible between 6 and 9%.
Figure 1: efficiency PACK (waste heat recovery system) from Orcan Energy AG
How does the efficiency PACK (waste heat recovery system) actually work?
To utilize the waste heat coming from the exhaust gas and cooling water, a refrigerant (R245fa) is used, which is also used in refrigerators/freezers and air conditioners. In the efficiency PACK, this will be heated under a pressure of 20 bar to 130 degrees Celsius (°C). The output of thermal energy will be directly converted to rotational energy via a simple screw expander. With this power output the propellers will be driven via the crankshaft of the engine. In this way, you can save on fuel costs as the engines will be spared. One efficiency PACK has 100 kW as maximum output. The installation can also be used to generate electricity.
VICUSdt has reduced the CO2 footprint further
Besides the efficiency PACKS, which will be installed and put into operation in the course of this year, VICUSdt has already reduced the CO2 footprint by installing two CFD optimized ship propellers. CFD represents for Computational Fluid Dynamics. This is very advanced software in order to accurately determine the ship’s hydrodynamic performance.
Figure 2: 3D-model of the aft-ship
Thanks to this simulation tool, we have reached the most efficient design of the ship propeller, appropriate to the hull form, the sailing profile and other fittings (like the ship rudders and nozzles). See figure 2 for the 3D-model of the aft-ship of this inland waterway vessel.