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v
var (var)
The var is a special name of SI volt-ampere unit for the reactive power used in alternating current technology. 1 var = 1 V.
Vegetable Oils
Oils extracted from certain oil plants (eg sunflower, rapeseed, etc.) which may be used as motor fuel in diesel engines under certain conditions.
Ventilation
A set of processes and devices intended to provide fresh air to mining workers and to eliminate or reduce concentrations of harmful dust or toxic or explosive gases (gray) to acceptable levels and to improve the environment of the mine (temperature and humidity).
Vento Geostráfico
Wind resulting exclusively from the pressure gradient and Coriolis forces.
Vertical Shaft Turbines
Turbines with vertical axis rotor. Usually they are of the Darrieus or Savonius.
Volatile Matter (MV)
Products of decomposition of the organic part of the fuel released in the gaseous state by heating the solid fuels under certain conditions at a temperature of 900 ° C in accordance with the international ISO specifications. The residue is called crude coke. Note: In some countries, the reference temperature is different.
volt (V)
Electromotive force, potential difference or voltage unit. The volt is the electric potential difference between two points of a conductor traveled by a constant current of 1 ampere when the power in play between the two points is equal to 1 watt.
Volume
Gases, liquid fuels and, in some cases, traditional fuels are expressed in units of volume. It should be noted that the temperature and pressure state of the gases and, to some extent, the liquid fuels should be explained when the measurement is referred to in terms of volume. The most frequently used units for the gases are the cubic meter or the cubic foot, whereas the ones most used for liquid fuels are the cubic meter, the barrel of oil, the US gallon, or the imperial gallon.
Vulnerability
The level of difficulty a system – country, region, community, ecosystem – faces in avoiding the adverse effects of climate change or adapting to them, specifically in terms of changes in their amplitude and the types of extreme phenomena.
w
Wall
Geological layer situated just below the bed.
Washed Coal
Final product enriched in pure coal, resulting from mechanical treatment by dry or humid.
Washing Residues
End product enriched in sterile, resulting from mechanical washing, dry or wet.
Waste Piles ( Piles of Coal, Heaps or Stockpiles)
Open deposit of the mining operation, for example: coal, barren, wastes from preparation, etc., which has the character of definitive (sterile) deposit or compensation of the long-term quantity between coal supply and demand.
Wastes forwarded to final destination
Total annual waste from the set of EDP facilities (industrial facilities and administrative services) eliminated and / or recovered, by an operator duly licensed for this purpose. In Portugal it includes the By-product sold. Waste resulting from the activity of service providers is not included.
Water Amount
Total Sum of the amount of surface water and hygroscopic humidity.
Water consumption in administrative buildings
Total annual water consumption of the public network used in the administrative buildings of EDP's companies. Excludes buildings located within substations or production centers and the company EDP Innovation.
Water Content
The water content of a fuel when its mass is constant at a temperature of 30 ° C and a relative humidity of 96-97%.
Water intake
Structure designed to capture the water of the reservoir.
Water upstream
Water that is upstream of the dam.
watt (W)
Power unit. Watt is the power of an energy system in which an energy of 1 joule is transferred uniformly for 1 second. 1 W = 1 J / s