Rocks & mirror
WÄRTSILÄ
Encyclopedia of Marine and Energy Technology

5802 results

Uranium

energy

Uranium is a chemical element with the symbol U and atomic number 92.

Upwind Turbine

energy

Turbines where the blades are upwind of the tower.

Upwind

energy

On the same side from where the wind is blowing from.

Upstream

energy

The oil and gas industry is usually divided into three major sectors: upstream, midstream and downstream.

Unstable stratification

energy

Unstable stratification of fluids occurs when each layer is more dense than the one below it.

Unloading

energy

The proces of disconnecting a generator or plant from the grid in a controlled manner.

Universe of Energy

energy

The Universe of Energy was a pavilion located on the eastern side of Future World at Epcot, a theme park at the Walt Disney World Resort in Bay Lake, Florida.

Units of energy

energy

As energy is defined via work, the SI unit of energy is the same as the unit of work – the joule (J).

United States customary units

energy

United States customary units (U.S. customary units) are a system of measurements commonly used in the United States since it was formalized in 1832, developed from English units which were in use in the British Empire before the U.S. became an independent country.

United Nations Framework Convention on Climate Change

energy

The UNFCCC secretariat (UN Climate Change) is the United Nations entity tasked with supporting the global response to the threat of climate change.

Unit of measurement

energy

A unit of measurement is a definite magnitude of a quantity, defined and adopted by convention or by law, that is used as a standard for measurement of the same kind of quantity.

Unit commitment problem in electrical power production

energy

The unit commitment problem (UC) in electrical power production is a large family of mathematical optimization problems where the production of a set of electrical generators is coordinated in order to achieve some common target, usually either match the energy demand at minimum cost or maximize revenues from electricity production.

Uninterruptible power supply

energy

An uninterruptible power supply or uninterruptible power source (UPS) is an electrical apparatus that provides emergency power to a load when the input power source or mains power fails.

Unintentional backfeeding

energy

A common source of unintentional backfeeding is an electrical generator (typically a portable generator) that is improperly connected to a building electrical system.

Unglazed transpired solar collectors

energy

The term "unglazed air collector" refers to a solar air heating system that consists of a metal absorber without any glass or glazing over top.

Undervoltage

energy

"Undervoltage" occurs when the nominal voltage drops below 90% for more than 1 minute.

Underground transmission

energy

A method to transmit electricity through insulated cables that are buried underground.

Underground thermal energy storage

energy

A method of seasonal thermal energy storage that utilises the earths starta or aquifers.

Underground storage tank

energy

An underground storage tank is, according to United States federal regulations, a storage tank, not including any underground piping connected to the tank, that has at least 10 percent of its volume underground.

Underground hydrogen storage

energy

Underground hydrogen storage is the practice of hydrogen storage in caverns, salt domes and depleted oil/gas fields.

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