WÄRTSILÄ
Encyclopedia of Marine and Energy Technology

5800 results

Joule–Thomson effect

energy

The phenomenon where a gas or liquid changes temperature when it experiences a pressure drop.

Natural gas processing

energy

Natural-gas processing is a range of industrial processes designed to purify raw natural gas by removing impurities, contaminants and higher molecular mass hydrocarbons to produce what is known as pipeline quality dry natural gas.

Shale Gas

energy

Shale gas is natural gas trapped in fine-grained sedimentary rock, particularly quartz and calcite.

Power-to-gas

energy

A technology that uses electrical power to produce a gaseous fuel.

Power to gas

energy

Power to gas is a technology which converts electrical power to a gas fuel.

Polytunnel

energy

A polytunnel is a tunnel typically made from steel and covered in polyethylene, usually semi-circular, square or elongated in shape. The interior heats up because incoming solar radiation from the sun warms plants, soil, and other things inside the building faster than heat can escape the structure.

Polymer flat plate collectors

energy

These collectors are an alternative to metal collectors and are now being produced in Europe.

Polymer electrolyte membrane (PEM) fuel cell

energy

A type of fuel cell being developed mainly for transport applications, as well as for stationary and portable fuel-cell applications.

Pollution

energy

Pollution is the introduction of contaminants into the natural environment that cause adverse change.

Polarity symbols

energy

Polarity symbols are a notation for electrical polarity, found on devices that use direct current (DC) power, when this is or may be provided from an alternating current (AC) source via an AC adapter.

Polar climate

energy

The polar climate regions are characterized by a lack of warm summers.

Point of common coupling

energy

The point in the electric circuit where a microgrid is connected to a main grid.

Point absorber buoy

energy

This device floats on the surface of the water, held in place by cables connected to the seabed.

Pneumatics

energy

Pneumatics is a branch of engineering that makes use of gas or pressurized air.

Pneumatic motor

energy

A pneumatic motor (air motor), or compressed air engine, is a type of motor which does mechanical work by expanding compressed air.

Plutonium-239

energy

Plutonium-239 is also one of the three main isotopes demonstrated usable as fuel in thermal spectrum nuclear reactors, along with uranium-235 and uranium-233.

Plutonium-238

energy

Plutonium-238 (238Pu) is a radioactive isotope of plutonium that has a half-life of 87.7 years. Plutonium-238 is a very powerful alpha emitter; as alpha particles are easily blocked, this makes the plutonium-238 isotope suitable for usage in radioisotope thermoelectric generators (RTGs) and radioisotope heater units.

Plutonium Management and Disposition Agreement

energy

The agreement regulates the conversion of non-essential plutonium into mixed oxide (MOX) fuel used to produce electricity.

Plate tectonics

energy

Plate tectonics is a scientific theory describing the large-scale motion of the plates making up the Earth's lithosphere since tectonic processes began on Earth between 3.3 and 3.5 billion years ago.

Plate heat exchanger

energy

A plate heat exchanger is a type of heat exchanger that uses metal plates to transfer heat between two fluids.

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