Rocks & mirror
WÄRTSILÄ
Encyclopedia of Marine and Energy Technology

R

251 results

Ramp Up (Ramp Down)

energy

To increase (or decrease) a rate or volume over a time period.

Ramps

marine

Large steel constructions consisting of longitudinal beams plated over to provide a vehicle roadway.

Rankine

energy

A Scottish mechanical engineer who developed the Rankine scale, an equivalent to the Kelvin scale of temperature, but in degrees Fahrenheit rather than Celsius.

Rankine scale

energy

The Rankine scale is an absolute scale of thermodynamic temperature.

Rankine vapor cycle

energy

The Rankine cycle is the ideal form of a vapor power cycle. The ideal conditions can be reached by superheating the steam in the boiler and condensing it completely in the condenser.

Rapson's slide

marine

A crosshead arrangement used on ram-type steering gear in which the mechanical advantage increases with the angle of turn.

Raster navigational chart (RNC)

marine

Rasterscan chart is a scanned reproduction of a paper chart.

Rated output capacity

energy

See "Nameplate Capacity"

Rated speed of engine

marine

The crankshaft revolutions per minute at which the rated power occurs as specified on the nameplate and in the Technical File of the marine diesel engine.

Rated wind speed

energy

The lowest wind speed at which the rated output power of a wind turbine is produced.

Raw material

energy

A raw material, also known as a feedstock, unprocessed material, or primary commodity, is a basic material that is used to produce goods, finished products, energy, or intermediate materials that are feedstock for future finished products.

RBMK

energy

The RBMK is a class of graphite-moderated nuclear power reactor designed and built by the Soviet Union

Reactance

energy

In electric and electronic systems, reactance is the opposition of a circuit element to the flow of current due to that element's inductance or capacitance.

Reaction turbine

energy

Design of a Turbine where energy is extracted from the steam predominantly by a change in pressure of the steam. The vanes (stationary components fixed to the casing) direct the steam toward the blades (rotating components attached to the rotor) which produce a force on the rotor.

Reactive power

energy

A condition when the voltage and current are 90 degrees out of phase.

Reactor pressure vessel

energy

A reactor pressure vessel in a nuclear power plant is the pressure vessel containing the nuclear reactor coolant, core shroud, and the reactor core.

Reactor vessel

energy

The reactor vessel is the first layer of shielding around the nuclear fuel and usually is designed to trap most of the radiation released during a nuclear reaction.

Reactor vessel body

energy

The reactor vessel body is the largest component and is designed to contain the fuel assembly, coolant, and fittings to support coolant flow and support structures.

Reactor vessel head

energy

This structure is attached to the top of the reactor vessel body.

Reactor-grade plutonium

energy

Reactor-grade plutonium is the isotopic grade of plutonium that is found in spent nuclear fuel after the uranium-235 primary fuel that a nuclear power reactor uses has burnt up.

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