DNV GL

DNV GL has introduced a new methodology for ship management to identify the sources of useful energy that are being wasted aboard ships.

COSSMOS software considers all components on-board a vessel and measures the ‘exergy’, the maximum useful energy from each component, to quantify energy losses from the hull, propulsion power train, machinery and electrical systems.

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DNV GL strategic research and innovation director Rune Torhaug said: “We have revisited the basic and universal laws of thermodynamics to develop a methodology based on exergy.”

An analysis of a waste heat recovery system with up to 70 components, carried out through the company’s exergy-based methology, identified the true sources of useful energy losses, revealing a picture far from self-evident.

Senior researcher and project manager George Dimopoulos said: “Subsequent optimisation in DNV COSSMOS yielded an increase in fuel savings that halved the payback time of the system.”

“True sources of losses were identified with greater accuracy than a traditional energy analysis.”

DNV GL identified a 50% reduction in exergy losses by applying its process to the fuel pre-processing sub-system for the marine fuel cell on-board the offshore supply vessel Viking Lady.

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An aframax tanker’s main engine was analysed using operating data with COSSMOS modelling, the true sources of losses were identified with greater accuracy than a traditional energy analysis.

“In fact, the standard energy analysis failed to identify the turbocharger as being the second largest contributor to exergy loss,” Dimopoulos added.

Image: Illustration of DNV GL’s fuel efficiency methodology. Photo: courtesy of DNV GL AS.