DNV GL Introduces Energy Efficiency Methodology

Posted by Michelle Howard
Wednesday, April 09, 2014
Photo courtesy of DNV GL

DNV GL presents a novel approach that overcomes challenges of assessing on board energy efficiency in a consistent manner. As a result, priorities for improvement can be determined accurately. In a new report released, 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.

 

Maritime Reporter November 2014 Digital Edition
FREE Maritime Reporter Subscription
Latest Maritime News    rss feeds

Shipbuilding

Damen Outfitting First of Nine Bahamas Patrol Boats

The first of nine Damen Stan Patrol 3007s ordered by the Royal Bahamas Defense Force has arrived at Damen Shipyards Gorinchem in the Netherlands for outfitting.

Liquefaction Terminals to Dominate LNG Capital Expenditure

Capital expenditure (Capex) on global LNG facilities is expected to total $259 billion (bn) over the period 2015-2019, with investments expected to be 88% larger

New Chinese Shipyard Launches First Ship

The new shipyard facility of Honghua Offshore Oil & Gas Equipment Company in Jiangsu, China, has launched its first ship, an IMT982 Platform Supply Vessel. The vessel,

Ship Repair & Conversion

Keeping to the Schedule in the Pacific Northwest

When a tightly scheduled repower for the Kodiak-based trawler Sea Mac in early December took a very bad turn, Mike Fourtner used his 25 years of fishing experience

Optimarin ,Goltens Ink BWT Retrofit Agreement

Ballast Water Treatment (BWT) specialist Optimarin and Goltens, a provider of engineering and installation solutions for the shipping industry, have signed a nonexclusive

China's Scrap Yards Apply for EU Regulation

China's Zhoushan Changhong International Ship Recycling and Jiang Xiagang Changjiang Ship Recycling Yard, world’s two biggest ship scrap yards by capacity,  have

Environmental

NZ Report: Human Error to Blame for Rena Grounding

New Zealand's Transport Accident Investigation Commission (TAIC) published its final report into the grounding of containership Rena in October 2011. The TAIC’s

Costa Rica Approves APM Terminals Project

Port operator APM Terminals, a unit of Denmark's A.P. Moller-Maersk, said on Friday Costa Rica's environment agency had approved the construction of its Moin Container Terminal project.

NOAA: US to See More Floods from Sea Level Rise

Most of U.S. coast may see 30 or more days a year of floods up to 2 feet above high tides. By 2050, a majority of U.S. coastal areas are likely to be threatened

Marine Power

Keeping to the Schedule in the Pacific Northwest

When a tightly scheduled repower for the Kodiak-based trawler Sea Mac in early December took a very bad turn, Mike Fourtner used his 25 years of fishing experience

New Chinese Shipyard Launches First Ship

The new shipyard facility of Honghua Offshore Oil & Gas Equipment Company in Jiangsu, China, has launched its first ship, an IMT982 Platform Supply Vessel. The vessel,

Multraship Buys Three More Tugboats from Damen

Multraship and Damen Shipyards Group agreed on three new ASD (Azimuth Stern Drive) Tugs, all for delivery to Multraship in 2015. After delivery in Vietnam, scheduled

News

Port Workers in Argentine Grain Hub End Strike

Port workers in part of the Argentine grains hub of Rosario lifted a work stoppage on Friday, only a day after they went on strike over demands for higher year-end bonuses, a union official said.

Madsen to Chair Norway’s Research Council Executive Board

Henrik O. Madsen appointed chairman of the executive board of the Research Council of Norway   DNV GL president and CEO Henrik O. Madsen was appointed as chairman

Larger Tankers May Offer Better Return Chances

Investors looking for returns in the tanker markets can invest their capital in a variety of ways. Should an owner invest in a VLCC or an Aframax? How about an

Classification Societies

Madsen to Chair Norway’s Research Council Executive Board

Henrik O. Madsen appointed chairman of the executive board of the Research Council of Norway   DNV GL president and CEO Henrik O. Madsen was appointed as chairman

DNV GL Targets Safer Approach to Subsea Lifting

The completion of a joint industry project (JIP) to improve existing standards and regulations around subsea lifting operations has resulted in a new recommended practice (RP).

LR Supports Chinese Recycling Yards' EU Application

LR’s initial verification of the Ship Recycling Facility Plans for both Zhoushan Changhong International Ship Recycling Co. Ltd. and Jiangyin Xiagang Changjiang

 
 
Maritime Careers / Shipboard Positions Maritime Contracts Maritime Standards Navigation Pipelines Pod Propulsion Port Authority Ship Electronics Ship Simulators Shipbuilding / Vessel Construction
rss | archive | history | articles | privacy | terms and conditions | contributors | top maritime news | about us | copyright | maritime magazines
maritime security news | shipbuilding news | maritime industry | shipping news | maritime reporting | workboats news | ship design | maritime business

Time taken: 0.2135 sec (5 req/sec)