The quantity of heat produced to change a unit weight of a liquid to vapor with no change in temperature.

The amount of solar radiation striking a surface per unit of time and area.

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

A building energy auditing technique for locating areas of low insulation in a building envelope by means of a thermographic scanner.

The amount of heat introduced to a space from all heat producing sources, such as building occupants, lights, appliances, and from the environment, mainly solar energy.

A mainly flat surface for transmitting radiant energy.

A device that captures the heat from the exhaust air from a building and transfers it to the supply/fresh fresh air entering the building to preheat the air and increase overall heating efficiency.

The regular periodic arrangement of atoms or molecules in a crystal of semiconductor material.

The ratio of the minimum amount of work or energy required to perform a task to the amount actually used.

A hydrocarbon gas obtained from underground sources, often in association with petroleum and coal deposits. It generally contains a high percentage of methane, varying amounts of ethane, and inert gases; used as a heating fuel.

A type of water heater that circulates water through a heat exchanger in a boiler. The heated water then flows into an insulated storage tank.

The unit price of a good or service estimated from some base year in order to provide a consistent means of comparison.

A solar energy conversion device that has a bowl shaped dish covered with a highly reflective surface that tracks the sun and concentrates sunlight on a fixed absorber, thereby achieving high temperatures, for process heating or to operate a heat (Stirlin ...

A graph representing the relationship between the power available from the wind and the wind speed. The power from the wind increases proportionally with the cube of the wind speed.

A measure of the efficiency of converting a fuel to energy and useful work; useful work and energy output divided by higher heating value of input fuel times 100 (for percent).

A type of motor designed to operate precisely at the synchronous speed with no slip in the full-load speeds (rpm).

A salt, sodium sulfate decahydrate, that melts at 90 degrees Fahrenheit; a component of eutetic salts that can be used for storing heat.

The amount of useful energy produced by a system less the amount of energy required to produce the fuel.

An instrument for measuring solar radiation.

Features and vegetation on the outside of or surrounding a building for aesthetics and energy conservation.