Next-generation LNG carrier concept revealed

20 Jul 2015
The LNGreen concept is claimed to increase energy efficiency by 8%, and cargo capacity by 5%, on current gas carrier designs

The LNGreen concept is claimed to increase energy efficiency by 8%, and cargo capacity by 5%, on current gas carrier designs

A project between DNV GL, Hyundai Heavy Industries, GTT and ship owner GasLog has concluded with an LNG carrier concept offering claimed energy efficiencies of around 8%, with a 5% increase in cargo capacity.

The LNGreen initiative aimed to improve efficiency and performance by considering actual operational conditions and optimisation of hydrodynamics, machinery and system configurations. The result – which also includes an improved boil-off rate – makes the concept better suited to future trading patterns than existing vessels, the partners claimed.

Martin Davies, project manager at DNV GL noted that the design is future compliant with new IGC code and Panama canal requirements, and offers “significant advances in a range of features, including speed-range flexibility, hull form and boil-off rate”.

The COSSMOS integrated engineering approach employed by DNV GL takes account of the many variables affecting the performance of an LNG carrier. Among those are the tightly integrated machinery systems involved; the variable characteristics of LNG under different conditions; and the operating profiles – and subsequent propulsion, electrical and temperature demands – of LNG carriers operating different routes.

HHI and DNV GL carried out the hydrodynamic performance evaluation by comparing CFD simulations. Different codes were applied to compare resistance and self-propulsion performance, and scale effects were also considered. Added resistance fromwind and waves was investigated in order to ensure sufficient power for operation in the targeted environmental conditions.

Cargo containment was investigated by GTT and HHI. The tank shape, necessary reinforcements and boil off rate calculations were examined to develop designs that could yield additional cargo capacity – from 174,000m3 to 182,800m3, while maintaining the same main dimensions.

Nikolaos Kakalis, manager of DNV GL Research & Development in Greece and responsible for COSSMOS development, said: “Fusing unique competencies of key experts with advanced tools like COSSMOS - as well as state-of-the-art hull optimisation software - we bring innovation that can generate tangible added value. LNGreen utilises existing technology… this concept design could be ordered today.”

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