To reap the greatest operational and environmental benefits, the new bow can be combined with Rolls-Royce hull design and power and propulsion integration skills.
The company’s short sea cargo concept is a recent example and reduces CO% emissions by more than 40 per cent.
Included in the concept is the proven Promas integrated rudder and CP propeller, which on its own improves propulsive efficiency by five to eight per cent.
Then comes the hybrid shaft generator (HSG) which allows engine speed to be reduced while still getting the benefit of producing electrical power with the shaft generator instead of running auxiliary gensets.
This means that the engine speed and propeller pitch can be optimised for the prevailing operating conditions, cutting fuel consumption and exhaust emissions.
The greatest saving in emissions is made if Bergen gas engines are specified instead of liquid fuelled or dual fuel units.
The lean burn Bergen gas engines can handle large and rapid load variations and are suitable for mechanical transmission of power to the propeller, having a very $at specific fuel consumption curve down to 20-25 per cent load, with a high thermal efficiency.
They emit 22-23 per cent less CO% per unit of power produced than a diesel engine. NOx is reduced by about 90 per cent, while SOx and soot emissions are negligible.
When these elements are combined with a Rolls-Royce hull design incorporating the new bow, the shipowner can achieve an efficient and seakindly ship, which has minimum environmental impact.
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