A wood-burning appliance for space and/or water heating and/or cooking.

A wood or gas burning appliance that is primarily used to provide ambiance to a room. Conventional, masonry fireplaces without energy saving features, often take more heat from a space than they put into it.

A hydropower plant that is operated at maximum allowable capacity for part of the day and is either shut down for the remainder of the time or operated at minimal capacity level.

The rate of flow of the wind undisturbed by obstacles.

This compound of nitrogen and oxygen is formed by the oxidation of nitric oxide (NO) which is produced by the combustion of solid fuels.

A passive solar heating system in which the sun warms a heat storage element, and the heat is distributed to the interior space by convection, conduction, and radiation.

The ratio of the percentage change in the quantity of a good or service demanded to the percentage change in the price.

A unit of rate of operation. Electrical Hp: a measure of time rate of mechanical energy output; usually applied to electric motors as the maximum output; 1 electrical Hp is equal to 0.746 kilowatts or 2,545 Btu per hour. Shaft Hp: a measure of the actual ...

The rate at which electricity is delivered to or by a system, part of a system, or piece of equipment expressed in kilowatts, kilovoltamperes, or other suitable unit, at a given instant or averaged over a specified period of time.

In reference to a wind energy conversion system, the area of a turbine blade surface that first comes into contact with the wind.

Both a noun and a verb to describe the exterior surface of building elements (walls, floors, ceilings, etc.) and furniture, and the process of applying it.

A measure of the amount of energy lost during the generation, transmission, and distribution of electricity.

The heat that flows from the building interior, through the building envelope to the outside environment.

A solar energy conversion device that uses a trough covered with a highly reflective surface to focus sunlight onto a linear absorber containing a working fluid that can be used for medium temperature space or process heat or to operate a steam turbine fo ...

The transmission of electricity through power lines.

In alternating current, the current goes from zero potential or voltage to a maximum in one direction, back to zero, and then to a maximum potential or voltage in the other direction. The number of complete cycles per second determines the current frequen ...

The process by which materials expel or release gasses.

Any device (or plant) that follows the sun's apparent movement across the sky.

A valve used to mix heated water with cold in a heating system to provide a desired water temperature for end use.

These lights use an electrically heated filament to produce light in a vacuum or inert gas-filled bulb.