A hybrid system enables ships with variable power requirements to run at high propeller efficiency.
Hybrid Propulsion is simply the use of two (or more) different power sources to run the propellers.
Traditionally the majority of commercial vessels are equipped with either diesel engines or electric motors for running of the propellers. By combining these two power sources in one system we get a hybrid propulsion system. Additional energy carriers could be battery packs, gas engines, permanent magnet motors, or others.
The system configurations may vary from simple single screw systems to complex configurations with a large number of operational modes available. A hybrid propulsion system enables engines and propellers to run optimally over a wide power range.
The hybrid propulsion systems benefit of the best from two systems; the combination of electric propulsion and diesel drive.
A hybrid propulsion system based on one diesel engine and one frequency controlled electric motor is a simple and efficient solution. Combining a battery pack to the configuration will further increase the system flexibility and the ability to optimise the energy consumption during operation.
By using a Brunvoll gearbox with multiple PTO/PTI options, or a twin-in singel-out gearbox there are multiple possibilities to build the optimum system satisfying the right power requirement for the specific vessel.
All Brunvoll Hybrid Propulsion Systems are tailor made for the operation profile of the specific vessel, with any power source whether it is diesel, electric, battery or gas.
A Hybrid Propulsion system allows for the highest energy efficiency provided the right power sources are selected to serve the range of operational conditions from lying idle in port to the need for full power in heavy operations at sea.
A Brunvoll Hybrid Propulsion system consisting of two CP-Propellers driven by a "father and son" main engine combination at each of the twin-in single-out gearboxes, in addition to one combined generator/electric motor at each gearbox for PTO/PTI functionality. Such a system allows for numerous operation modes and efficient operation.
By adding batteries to the hybrid propulsion system the configuration can be designed for further profit from reduced fuel consumption, reduced running hours at the main engine and thereby reduced maintenance, higher redundancy, need for less power in the gen.sets, smoother operation of the gen.sets or main engine by using the batteries for peak shaving.
Energy efficiency depends on a range of parameters from hull resistance, desired speed, power setup with fuel type, engine type and corresponding fuel diagram, configuration of the propulsion lines and systems, hydrodynamic conditions and operation profile, to name some of them.
Hybrid propulsion systems varies from simple systems with a few operation modes to the more sophisticated and complex systems with numerous running modes for a wide range of operations.
Any vessel with varying working conditions require flexible solutions in order to execute all tasks in the most efficient way.
Analyse the yearly operation profile of the vessel by how many days in the different conditions.
Evaluate the requirement for energy sources for the different tasks and design your system according to the ship’s actual service profile.
Brunvoll propellers are all designed to fit the specific vessel. Brunvoll bases its hydrodynamic expertise in propeller design on calculation methods of the latest hydrodynamic theories and tank test results.
In a CP-propulsion system reducing zero pitch loss is essential, which means to use minimum of energy just to rotate the propellers without giving thrust to the vessel.
Selected Brunvoll references
Brunvoll CP-Propulsion system including Integrated Costa Propulsion (ICP), Rim Driven Thruster (RDT), Tunnel Thrusters and Control systems
Brunvoll Propulsion system with rudder and steering gear, Thrusters and Control System
Brunvoll CP-Propulsion System, Tunnel Thrusters, Retractable Azimuth Thrusters and Control Systems