Wet scrubber is a simple method to clean exhaust air or exhaust gas and remove toxic or smelling compounds. They are more effective when the water drop size gets smaller and the total surface between water or washing fluid and the gas gets larger. The water or washing fluid is recirculated normally in order to save water and reduce the amount of wastewater. Wet scrubbers are used in the semiconductor industry for the removal of TEOS (Tetraethoxysilane), TiCl4 Titan tetrachloride or HMDSO (Hexamethyldisiloxane) from the exhaust gas. A wet scrubber can be combined with other flue gas cleaning methods. They are also used in treating industrial process gas streams, removing sub-micron and larger particulate, acid gases, odors, fumes and vapors.

Wind measurement system is a passive, aerodynamic yaw system with an operating mode, which uses the electrical power generated as an indicator of wind speed. Sequence control and yawing requires measuring the wind speed and direction, in case of larger turbines. It is better to measure wind speed directly by means of the electric power output. The rotor is the wind measuring instrument of a turbine. The precise measurement of wind speed and direction is an essential element in weapon and decoy systems control, helicopter and fixed wing aircraft handling, navigation and fuel management. In addition to supplying basic meteorological information, vectored wind velocity measurements are essential to the analysis of small caliber ballistic trajectories, optical wave propagation in the lower atmosphere, and wind shears as well as vorticies.

Wind power system is meant for the conversion of wind energy into more useful forms, usually electricity using wind turbines. Most modern wind power is generated in the form of electricity by converting the rotation of turbine blades into electrical current by means of an electrical generator. In windmills, wind energy is used to turn mechanical machinery to do physical work, like crushing grain or pumping water. Wind power is used in large scale wind farms for national electrical grids as well as in small individual turbines for providing electricity to rural residences or grid-isolated locations. Wind energy is abundant, renewable, widely distributed, cleans and mitigates the greenhouse effect if used to replace fossil-fuel-derived electricity.