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Collaborative LNGreen carrier design boasts 8% efficiency increase

DNV GL’s LNGreen project, a joint-industry initiative with Hyundai Heavy Industries (HHI), GTT and GasLog, has culminated in a new, 8% more efficient LNG Carrier design.

Using DNV GL’s recently-introduced COSSMOS modelling suite, and combining findings with real-life operating conditions according to data from GasLog’s fleet of LNG Carriers, the project managed to increase cargo volume by 5% and improve efficiency, further exacerbating the potential savings for operators.

From a starting point of 174,000 cu m, GTT and HHI’s collaboration on the design increased the capacity to 182,800 cu m without growing the overall length, breadth or draft.

With the vessel running primarily off boil-off gas from the vessel’s tanks, the COSSMOS system helped to establish the limitations of various operating profiles of boil-off-gas from different varieties of LNG, in terms of speed, propulsion, electrical and heat demand.

“Using enabling computer tools we managed to develop a vessel which is approximately 8% more energy efficient and has increased its cargo volume capacity by 5%," said DNV GL’s Martin Davies, project manager. “The design is future compliant with new IGC code, Panama requirements as well as significant advances in a range of features, including the speed-range flexibility, hull form and boil-off rate”.

Nikolaos Kakalis, manager of DNV GL Research & Development in Greece and responsible for COSSMOS development, added: “fusing unique competencies of key experts from across the industry, like HHI, GTT, and GasLog, with advanced tools like the COSSMOS machinery systems simulation and optimisation computer platform as well as state-of-the-art hull optimisation software, we bring innovation in practice that can generate tangible added value.

“As LNGreen utilises existing technology it is important to stress that this concept design could be ordered today”.

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