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Tuesday, June 22, 2021 

RH Marine has developed a new green Dynamic Positioning (DP) system, which optimises fuel consumption of generators and thrusters by switching to batteries, meaning ships can operate more efficiently and save fuel as well as allowing quieter running.

The green DP system has been developed for dredgers, research vessels, naval vessels, work vessels and yachts, among others. As more new-build vessels require to be able to DP silently for a pre-defined number of hours on battery power, this is desirable from a comfort perspective for the people on board and more importantly complies with strict regulations in some Emission Control Areas (ECAs) to minimise emissions.

The new DP system is connected to the Power Management System (PMS) and Energy Management System (EMS) and all those systems communicate with each other in a smart way. If the DP system knows its operational time and the acquired kilowatt-hours, the EMS can predict and calculate how much power needs to be generated over time. After that, it allocates on the various sources in the most optimal way based on an operational goal. For example, based on forecasts of weather combined with a planned to be sailed route, or combined with a certain intended station keeping position. If the DP system can indicate how much energy it will consume, then the EMS can calculate the most optimal energy generation allocation to minimise the fuel required, with the benefit that the required load can be distributed in a smarter way, controlling energy consumption using prior knowledge, which means significant fuel savings.

The EMS can store power from the generators in batteries or – in the future – in other forms of storage such as fuel cells or flywheels. In that case, the thrusters run on battery power and the generators can be switched off. Then the ship can DP silently and sail with reduced emission. In some Emission Control Areas (ECA’s) this is even mandatory.

The optimisation of energy consumption can also be extended to other functionalities on board., such as HVAC systems.

RH Marine supplies the various systems for energy and power management of vessels under the product name Rhodium.

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