An electrical device for converting alternating current to direct current. The chamber in a cooling device where water is separated from the working fluid (for example ammonia).

A type of solar heating system that circulate warm water from storage through the collectors and exposed piping whenever freezing conditions occur; obviously a not very efficient system when operating in this mode.

A hydrogen production process that process uses algae. Under certain conditions, the pigments in certain types of algae absorb solar energy. An enzyme in the cell acts as a catalyst to split water molecules. Some of the bacteria produces hydrogen after th ...

The ratio of a boiler's or gasifier's maximum output to its minimum output.

Air that is taken from the outdoors.

The heat-transfer (exchanger) component of a heatpump, located outdoors, from which heat is collected in the heating mode, or expelled in the cooling mode.

The labels placed on appliances to enable consumers to compare appliance energy efficiency and energy consumption under specified test conditions as required by the Federal Trade Commission.

The maximum energy demand or load in a specified time period.

A popular term used to describe the increase in average global temperatures due to the greenhouse effect.

A solar absorber surface that has high absorbtance at wavelengths corresponding to that of the solar spectrum and low emittance in the infrared range.

To allow or augment the natural movement of cooler air from exterior, shaded areas of a building through or around a building.

A type of incandescent lamp that contains a halogen gas in the bulb, which reduces the filament evaporation rate increasing the lamp life. The high operating temperature and need for special fixtures limits their use to commercial applications and for use ...

A building element that shades windows, walls, and doors from direct solar radiation and protects these elements from precipitation.

The loss of heat as the water circulates through a water heater tank and inlet and outlet pipes.

This committee has jurisdiction on: coal production, distribution and utilization; energy policy; energy research, conservation, and development; hydroelectric power; irrigation; mineral conservation; nonmilitary development of nuclear energy; solar energ ...

Materials left over from making nuclear energy. Radioactive waste can living organisms if it is not stored safely.

This law states that no device can completely and continuously transform all of the energy supplied to it into useful energy.

Energy conversion technologies that harness the energy in tides, waves, and thermal gradients in the oceans.

The load created by moisture in the air, including from outside air infiltration and that from indoor sources such as occupants, plants, cooking, showering, etc.

As a component of a heating or cooling appliance, rows of tubing or pipe with fins attached through which a heat transfer fluid is circulated and to deliver heat or cooling energy to a building.