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  • 2014 April 10 18:05

    DNV GL introduces next generation energy efficiency methodology

    DNV GL presents a novel approach that overcomes challenges of assessing on board energy efficiency in a consistent manner, the company said in its press release. As a result, priorities for improvement can be determined accurately. In a new report released today, DNV GL answers the question: How can a ship manager identify the biggest sources of useful energy that are currently being wasted on their ships?

    “Ship operations and environmental legislation have become more complex, and it has become increasingly difficult to assess or even define efficiency with consistency and accuracy,” said Rune Torhaug, Director, Strategic Research & Innovation, DNV GL. “We have therefore revisited the basic and universal laws of thermodynamics to develop a methodology based on exergy, sometimes called available energy, which is a metric for describing the maximum useful energy that can be derived from a process, component or system.”

    The methodology can be adjusted to suit newbuilds still in the design phase or operating ships, and it is designed to help managers make the most out of their Ship Energy Efficiency Management Plans. Using both on board measurements and the DNV GL modelling suite COSSMOS, energy losses throughout the ship including hull, propulsion power train, machinery and electrical systems are quantified and ranked. Even difficult-to-capture processes such as throttling and fluid mixing can be incorporated.

    The report includes an analysis of a waste heat recovery system. These complex systems can easily contain 70 components. “Through our exergy-based methodology, the true sources of useful energy losses were identified, revealing a picture far from self-evident. Subsequent optimisation in DNV COSSMOS yielded an increase in fuel savings that halved the payback time of the system,” said George Dimopoulos, senior researcher and project manager of this position paper.

    A second study examined the fuel pre-processing sub-system for the marine fuel cell on board the offshore supply vessel Viking Lady. This resulted in a solution capable of a remarkable 50 per cent reduction in exergy losses.

    When the main engine of an aframax tanker was analysed using operating data in combination with COSSMOS modelling, the true sources of losses were identified with greater accuracy than a traditional energy analysis, says Dimopoulos. “In fact, the standard energy analysis failed to identify the turbocharger as being the second largest contributor to exergy loss.”

    With this ‘common currency’ for efficiency, DNV GL provides a way of energy management that will work for all ships, and all system and components that convert energy on board. It thus offers ship managers an unparalleled way of prioritising investment in technology alternatives or new operational strategies.

    About DNV GL
    Driven by its purpose of safeguarding life, property and the environment, DNV GL enables organisations to advance the safety and sustainability of their business. We provide classification and technical assurance services along with software and independent expert advisory services to the maritime, oil & gas and energy industries. We also provide certification services to customers across a wide range of industries. Operating in more than 100 countries, our 16,000 professionals are dedicated to helping our customers make the world safer, smarter and greener.

    About DNV COSSMOS
    Developed by DNV GL Strategic Research & Innovation DNV COSSMOS is a computer platform that models, simulates and optimises complex and integrated ship machinery systems with respect to energy efficiency, emissions, costs and safety. With COSSMOS DNV GL is able to analyse alternative configurations in new vessels, perform assessment and optimisation in ships in operation systems, and evaluate the potential of new technologies.


2022 January 27

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16:36 Construction of digital shipyard commenced at Onezhsky Shipbuilding, Ship Repair Yard
16:17 Suez Canal Economic Zone signs local and foreign contracts for Sokhna port new berths works
15:35 Construction of support fleet base in Ust-Luga approved by Glavgosexpertiza
15:32 ABS grants AIP to a coordinated design for a wind turbine installation vessel
15:14 Tarragona Port Authority has awarded Global Ports Holding a 12-year concession to manage the services for cruise passengers
15:00 Marine Rescue Service removed all oil products from Chinese ship Xing Yuan
14:53 Cooperation Agreement signed between ThPA S.A. and Suez Canal Economic Zone
14:42 DP World joins forces with Mærsk Mc-Kinney Møller Center for Zero Carbon Shipping
14:32 A.P. Moller - Maersk shares millions of weather observations to aid climate science
14:22 IMB releases 2021 Piracy and Armed Robbery Report
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12:49 NYK delivers methanol-fueled chemical tanker
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2022 January 26

18:06 Safe Bulkers announces agreement for the acquisition of one Capesize class dry-bulk Japanese vessel
17:54 Olga Naumova takes helm of Russian Fishery Company
17:41 Shearwater GeoServices awarded Western Australia multicomponent surveys by Santos
17:26 Heerema wins decommissioning contract for multiple Petrogas platforms
16:27 USCG to break ice along Penobscot, Connecticut, and Hudson Rivers
16:03 Deltamarin signs an engineering contract for Höegh Autoliners Aurora Class PCTCs
15:58 Avenir sells the world’s largest LNG bunker vessel
15:55 Rosmorport supports "Soul of the Caspian" expedition aimed at studying and conserving Caspian seal
15:33 Maersk Supply Service launches new venture company to deliver offshore vessel charging
14:40 Throughput of OTEKO Group terminals in Taman surged by 82%, year-on-year
14:13 Fincantieri’s U.S. shipyards join Green Marine
13:48 Yakutia LNG project may need new port facilities in Sea of Okhotsk
13:27 Konecranes provides 17 Automated Rubber-Tired Gantry Cranes in fully integrated solution for Port of Felixstowe
12:37 Freeport of Ventspils handled over 11.1 million tons of cargo in 2021
12:01 DNV selected to lead “pioneering" ammonia bunkering safety study in Singapore
11:32 Superyacht Phi delivered to ABS class
11:23 Smart Ports Russia 2022 to bring together ports and terminals in Moscow
10:58 KN transhipped the first bulk bitumen to a tanker
10:58 Port Houston annual TEUs set record with 15 percent growth
10:37 CIMAC World Congress is postponed to June 2023
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2022 January 25

18:10 Ports of Los Angeles & Long Beach postpone Container Excess Dwell Fee
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17:36 Broad scope of Wärtsilä power solutions selected for gas-fuelled ferry trio
17:26 ICTSI's Cavite Gateway Terminal beefs up operations
17:04 BLRT Grupp is constructing a unique floating exhibition centre for Norway