Rocks & mirror
WÄRTSILÄ
Encyclopedia of Marine and Energy Technology

5802 results

Reynolds number

energy

The Reynolds number (Re) helps predict flow patterns in different fluid flow situations.

Revolutions per minute (rpm)

energy

The number of turns in one minute.

Reversible process (thermodynamics)

energy

In thermodynamics, a reversible process is a process whose direction can be reversed to return the system to its original state by inducing infinitesimal changes to some property of the system's surroundings.

Reverse engineering

energy

Reverse engineering is a process or method through the application of which one attempts to understand through deductive reasoning how a device, process, system, or piece of software accomplishes a task with very little (if any) insight into exactly how it does so.

Reverse costing

energy

Reverse costing describes the process of disassembling (reverse engineering) a device to identify manufacturing technology and calculate its manufacturing costs through a cost analysis of its parts and the effort required to assemble them.

Return on Investment (ROI)

energy

A ratio that describes the profitability or efficiency of an investment.

Retrofitting

energy

The addition of new technology or features to older systems.

Pico hydro

energy

Pico hydro is a term used for hydroelectric power generation of under 5 kW.

Physically stranded gas

energy

A gas field that is too deep to drill for, or is beneath an obstruction, may be considered physically stranded.

Physical quantity

energy

A physical quantity is any phenomenon that can be measured with an instrument or be calculated for.

Physical oceanography

energy

Physical oceanography is the study of physical conditions and physical processes within the ocean, especially the motions and physical properties of ocean waters.

Photovoltaics

energy

Photovoltaics (PV) is the conversion of light into electricity using semiconducting materials that exhibit the photovoltaic effect, a phenomenon studied in physics, photochemistry, and electrochemistry.

Photovoltaic thermal hybrid solar collector

energy

Photovoltaic thermal collectors, typically abbreviated as PVT collectors and also known as hybrid solar collectors, photovoltaic thermal solar collectors, PV/T collectors or solar cogeneration systems, are power generation technologies that convert solar radiation into usable thermal and electrical energy.

Photovoltaic technology

energy

Photovoltaic (PV) technology transforms the energy of sunlight (solar photons) into direct electric current using semiconductor materials.

Photovoltaic system performance

energy

Photovoltaic system performance is the ratio of actual solar PV system output compared with expected values, which is essential for proper solar PV facility's operation and maintenance.

Photovoltaic power station

energy

See "Solar Farm".

Photovoltaic system

energy

A photovoltaic system, also PV system or solar power system, is a power system designed to supply usable solar power by means of photovoltaics.

Photovoltaic effect

energy

A physical and chemical phenomenom that generates voltage and current in materials that are exposed to light.

Photovoltaic cell

energy

Also known as a solar cell, is used to convert light energy into electricity.

Photovoltaic array

energy

An interconnected system of PV modules that function as a single electricity-producing unit. In smaller systems, an array can consist of a single module.

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