Rocks & mirror

WÄRTSILÄ
Encyclopedia of Marine and Energy Technology

W

181 results

Wafer

energy

A thin slice of semiconductor, such as a crystalline silicon (c-Si), used for the fabrication of integrated circuits and, in photovoltaics, to manufacture solar cells.

Wake

marine

Moving forward, a ship imparts the forward motion to the water at the stern. It is known as the wake

Wake equalization duct

marine

The propulsion improving device, especially for full block ships, developed by Professor Schneekluth.

Wake fraction coefficient

marine

The speed of advance of the propeller “VA” relative to the water in which it is working is lower than the observed speed of the vessel “V”.

Wake-field

marine

When the ship is sailing ahead, the friction of the hull will create a boundary layer of water around the hull.

War of the Currents

energy

Sometimes called battle of the currents, was a series of events surrounding the introduction of competing electric power transmission systems (AC and DC) in the late 1880s and early 1890s

Warping head, warping end, gypsy head

marine

A cylinder-like fitting at the end of winch or windlass shafts. The fiber line or wire rope is hauled or slacked by winding a few turns around it, the free end being held taut manually as it rotates

Wash

marine

The waves and ripples spreading out from a vessel when underway.

Wash bulkhead

marine

A perforated bulkhead fitted into a cargo or deep tank to reduce the sloshing or the movement of liquid through the tank.

Washing machines

marine

Tank washing machines either fixed or portable. They consist of revolving nozzles moved by water-driven gearing to create a spherical wash pattern or “cycle”.

Waste

marine

Useless or superfluous matter which is to be discarded. Incineration of burnable waste is the most efficient means of disposal.

Waste heat

energy

Waste heat is heat that is produced by a machine, or other process that uses energy, as a byproduct of doing work.

Waste heat boiler

marine

A boiler which uses the exhaust gas from an engine to produce low pressure saturated steam.

Waste heat recovery (WHR)

marine

The energy from the combustion process in an internal combustion engine not converted into useful work, e.g. energy in the exhaust gas or cooling water.

Waste heat recovery steam generator

energy

A generator that produces steam from the heat generated by an engines exhaust system.

Waste management plan

marine

Collection, treatment and disposal of waste.

Waste oil

energy

Waste oil is defined as any petroleum-based or synthetic oil that, through contamination, has become unsuitable for its original purpose due to the presence of impurities or loss of original properties.

Waste water

marine

Drainage from dishwater, showers, laundry, bath and washbasin drains and does not include drainage from toilets, urinals, hospitals and cargo spaces. Galley water can contain oil, fats and detergents...

Waste water treatment systems

marine

Plants installed to treat any intended discharges overboard.

Wastegate

energy

A wastegate is a valve that controls the flow of exhaust gases to the turbine wheel in a turbocharged engine system.

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