Power Engineering Dictionary
Home Up Contact Us


Job Hotline
Fireman Exams
Q & A Steam Turbines
Engineering Exams
Test YourSelf
Learning Center
Energy Tips
Power Plant Formulas
Steam Turbines
Free Energy Stuff
Trade Books
Trade Links
Local Vendors



WALK-IN-COOLER - A large commercial refrigerated space often found in supermarkets or places for whole sale distribution.

WASTE WATER - The used water and solids from industrial processes that flow to a treatment plant.

WATER - A tasteless, odorless, colorless liquid in its pure state.

WATER ABSORPTION - The amount of weight gain (%) experienced in a polymer after immersion in water for a specific length of time under controlled environment.

WATER HAMMER - Banging of pipes caused by the shock of closing valves (faucets).

WATER LUBRICANT - Water used as a lubricant; for example, in a mechanical seal on a centrifugal water pump.


WATER SOFTENER - A device or system used to remove calcium and magnesium hardness minerals from a water supply.

WATER TUBE - A boiler tube through which the fluid under pressure flows. The products of combustion surround the tube.

WATER VAPOR - In air conditioning, the water in the atmosphere.


WATER, BRAKISH - (1) Water having less salt than sea water, but undrinkable. (2) Water having salinity values ranging from about 0.5 to 17 parts per thousand.

WATER, POTABLE - Water that is safe to drink.

WATER, SOUR - Waste waters containing fetid materials, usually sulfur compounds.

WATER-ICE REFRIGERATION SYSTEM - Heat is absorbed as ice melts and thus producing a cooling effect.

WATER LEG - That space that is full of boiler water between two parallel plates. It usually forms one or more sides of internally fired boilers.

WATER WALL - A row of water tubes lining a furnace or combustion chamber, exposed to the radiant heat of the fire.

WATT (W) - A measure of electric power equal to a current flow of one ampere under one volt of pressure; or one joule per second in SI units.

WEIGHT TO POWER RATIO - It is the weight of the machine producing work. For example - the gas turbine is capable of producing more horse power per given mass of its machinery, then the same amount of horse power produced by a machine having many times that mass.

WET BULB - Device used in measurement of relative humidity. Evaporation of moisture lowers temperature of wet bulb compared to dry bulb temperature in same area.

WET BULB TEMPERATURE (WB) - The temperature registered by a thermometer whose bulb is covered by a saturated wick and exposed to a current of rapidly moving air. The wet bulb temperature also represents the dew point temperature of the air, where the moisture of the air condenses on a cold surface.

WET STANDBY - Boiler is filled completely with water or maintained at normal operating level with a positive nitrogen pressure of 35 to 70 kPa.

WET-BULB DEPRESSION - The difference between the dry-bulb temperature and the wet bulb temperature.


Willans Line - The Willians line is used to show steam rates at different loads on the turbine.  Often, a willans line for a specific turbine is not available, and one only has has incomplete information about an installed steam turbine; namely the rated power and (perhaps a guesstimate) the isentropic efficiency or specific steam consumption at full load. But what you need and don't have is the steam consumption at the turbine operating load.

WIND AGE DRIFT - That water lost from an open re-circulating-water system by means of wind blown through the spray area that carries water out of the system. This is not the same as loss by evaporation, since such a loss can occur even without evaporation.

WOBBLE PLATE-SWASH PLATE - Type of compressor designed to compress gas, with piston motion parallel to crankshaft.

WORKING FLUID - is the substance which does the work in a heat engine. The air is one of the working fluids used with gas turbines. Freon's are the working fluids used with some refrigeration systems. Water is the working fluid used with steam boilers.

Go to: X

Table of contents Power Plant Dictionary