CLASSIFICATION society DNV GL has announced the introduction of an energy efficiency assessment method in determining sources energy wastage aboard 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 DNV GL research chief Rune Torhaug.
"We have developed 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," said Mr Torhaug.
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, said the DNV GL statement.
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 release said.
"Through our exergy-based methodology, the true sources of useful energy losses were identified. Subsequent optimisation in DNV COSSMOS yielded an increase in fuel savings that halved the payback time of the system," said project manager George Dimopoulos.
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."
WORLD SHIPPING
21 April 2014 - 21:52
Class society DNV GL devises new method of capturing
CLASSIFICATION society DNV GL has announced the introduction of an energy efficiency assessment method in determining sources energy wastage aboard ships.
WORLD SHIPPING
21 April 2014 - 21:52
Class society DNV GL devises new method of capturing wasted energy
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