The potential energy available in a fuel as received, taking into account the energy loss in evaporating and superheating the water in the fuel. Equal to the higher heating value minus 1050W where W is the weight of the water formed from the hydrogen in t ...

A heat absorbing reaction or a reaction that requires heat.

A power line for supplying electricity within a specified area.

A solar thermal collector that has an absorber that does not have a glazed covering. Solar swimming pool heater systems usually use unglazed collectors because they circulate relatively large volumes of water through the collector and capture nearly 80 pe ...

The unit of magnetic field intensity equal to 1 dyne per unit pole.

A facility or piece of equipment that produces electricity.

The unit of illuminance equivalent to 1lumen per square meter.

A light source composed of a metal base, a glass tube filled with an inert gas or a vapor, and base pins to attach to a fixture.

Generation of energy at the location where all or most of it will be used.

To heat a gaseous mixture to the temperature at which combustion takes place.

The cutting of a grid pattern of grooves in a semiconductor material, generally for the purpose of making interconnections.

A unit of electrical measurement equal to the product of a volt and an ampere.

A charge for the maximum rate at which energy is used during peak hours of a billing period. That part of a utility service charged for on the basis of the possible demand as distinguished from the energy actually consumed.

The prescribed level of pollutants allowed in outside or indoor air as established by legislation.

The pressure of the steam or water in a boiler as measured; usually expressed in pounds per square inch gauge (psig).

A drag-type wind machine that can react to wind from any direction.

A unit of power equal to 1 billion Watts; 1 million kilowatts, or 1,000 Megawatts.

Gasoline fuel additives such as ethanol, ETBE, or MTBE that add extra oxygen to gasoline to reduce carbon monoxide pollution produced by vehicles.

A device mounted in the vent connector that closes the vent when the heating unit is not firing. This traps heat inside the heating system and house rather than letting it draft up and out the vent system.

Turbines in which the rotor speed increases and decreases with changing wind speed, producing electricity with a variable frequency.