Environmental Engineering Reference
In-Depth Information
Wood/wood waste:
A category of biomass energy that includes black liquor; wood/
wood waste liquids (red liquor, sludge wood, spent sulfite liquor); and wood/
wood waste solids (peat, paper pellets, railroad ties, utility poles, wood/
wood waste).
Y
Yaw:
The rotation of a horizontal axis wind turbine around its tower or vertical axis.
Yaw drive:
Motor that keeps an upwind turbine facing into the wind.
Z
Zonal isolation:
Various methods to selectively partition portions of the wellbore for
stimulation, testing, flow restriction, or other purpose.
Zone:
An area within the interior space of a building, such as individual rooms, to
be cooled, heated, or ventilated. A zone has its own thermostat to control
the flow of conditioned air into the space.
