Abbreviation for the American Society of Heating, Refrigeration, and Air-Conditioning Engineers.

Two metals of different coefficients of expansion welded together so that the piece will bend in one direction when heated, and in the other when cooled, and can be used to open or close electrical circuits, as in thermostats.

A device for converting one form of energy or fuel into useful energy or work.

A measure of the electrical charge of a capacitor consisting of two plates separated by an insulating material.

Primitive plants, usually aquatic, capable of synthesizing their own food by photosynthesis.

The air external to a building or device.

The power conduit of an electric power plant; the starting point of the electric transmission system.

A quantity of (solid) biomass fuel equal to 2,400 pounds bone dry.

In heating and cooling system distribution ductwork, the transformation pieces connecting horizontal round leaders to vertical rectangular stacks.

A method of growing large size, high quality semiconductor crystal by slowly lifting a seed crystal from a molten bath of the material under careful cooling conditions.

The refrigerating effect in Btu/h produced by the difference in total enthalpy between a refrigerant liquid leaving the unit and the total enthalpy of the refrigerant vapor entering it. Generally measured in tons or Btu/h.

An electrical conductor that serves as a common connection for two or more electrical circuits; may be in the form of rigid bars or stranded conductors or cables.

A building construction technique used to create a continuous air retarder that uses the drywall, gaskets, and caulking. Gaskets are used rather than caulking to seal the drywall at the top and bottom. Although it is an effective energy-saving technique, ...

An air pollution control device that removes organic contaminants by oxidizing them into carbon dioxide and water through a chemical reaction using a catalysis, which is a substance that increases (or decreases) the rate of a chemical reaction without bei ...

A process for carrying out a reaction in which the reactants are fed in discrete and successive charges.

A method of predicting heating and/or cooling loads using instantaneous load calculation at different outdoor dry-bulb temperatures, and multiplying the result by the number of hours of occurrence of each temperature.

A region of transition between semiconductor layers, such as a p/n junction, which goes from a region that has a high concentration of acceptors (p-type) to one that has a high concentration of donors (n-type).

A type of ceiling and roof assembly that has no attic.

A system that records the consumption of electricity, gas, water, etc, and sends the data to a central data accumulation device.

The illuminating power of a standard candle employed as a unit for determining the illuminating quality of an illuminant.