Wärtsilä launches Low Loss Hybrid system

In tests in Eidesvik PSV Viking Lady, LLH system delivered 15% fuel savings

AUGUST 25, 2014 — Wärtsilä is using this week’s ONS 2014 event  in Stavanger, Norway, to launch its new Low Loss Hybrid (LLH) system. It utilizes different power sources in combination with energy storage devices to operate the prime movers closest to their optimum performance. In addition to annual fuel savings of up to 15 per cent, depending on the type and configuration of the engine and mission profile, the LLH ensures a substantial reduction in exhaust gas emissions.

The overall hybrid control system is the key element in the total control and stability of the ship’s electrical system and the energy flows. The Wärtsilä LLH system is integrated with the inverter control units and interfaces with the conventional power management system. The total energy storage system is approved according to the new DNV class rules for battery power. The Wärtsilä LLH is suitable for application in a variety of market segments, including offshore vessels, tugs, ferries and coastal vessels, for new building as well as to upgrade existing installations.

Earlier this year, the Wärtsilä LLH was installed and tested aboard the 92 m Eidesvik  platform supply vessel Viking Lady. A comprehensive measurement program that monitored transit mode in heavy weather conditions, critical operations, and standby mode confirmed actual fuel savings of 15 per cent. For this particular vessel, such savings would give an estimated payback time of less than four years. Emission reductions were also substantial, with local emissions in harbour virtually eliminated.

A key feature of the Wärtsilä LLH is its ability to reduce transient engine loads that cause increased fuel consumption and added emissions. Furthermore, by increasing the power redundancy, the system allows the engine to operate closer to its optimum design point where it has highest efficiency and least emissions. Reduced maintenance and increased system performance through rapid response from the energy storage system are also among the benefits offered.

“Fuel efficiency and a reduced environmental footprint are central to the current and future needs of the entire marine sector. The Wärtsilä Low Loss Hybrid system supports both of these aims and is an important enabler for energy and cost efficient shipping. We look forward to introducing our customers to this concept at the ONS 2014 exhibition,” says Juhani Hupli, Vice President, Electrical & Automation, Wärtsilä Ship Power.