A program of the U.S. Department of Energy (DOE) that implements energy legislation and presidential directives. FEMP provides project financing, technical guidance and assistance, coordination and reporting, and new initiatives for the federal government ...

The purpose for which useful energy or work is consumed.

The process of moving air (changing) into and out of an interior space either by natural or mechanically induced (forced) means.

A generic term for liquefied and pressurized gas, ordinarily butane, propane, or a mixture of the two, contained in a cylinder for domestic use.

Heat stored above room temperature (in a solar heating system).

Water saturated or strongly impregnated with salt.

A heat exchanger coil in which a fluid such as water is circulated and a fan blows air over the coil to distribute heat or cool air to the different rooms.

A heat absorbing reaction or a reaction that requires heat.

A device that cools air by removing moisture from it.

The factor, when multiplied by the monthly degree-days, that yields the monthly space heating load.

A graph that indicates the distribution of wind speeds as a function of the cumulative number of hours that the wind speed exceeds a given wind speed in a year.

The ratio of the maximum demand on an electricity generating and distribution system to the total connected load on the system; usually expressed as a percentage.

Energy terms

Energy systems supply individual, or small-groups, of energy loads.

In reference to solar energy systems, the angle at which direct sunlight strikes a surface; the angle between the direction of the sun and the perpindicular to the surface. Sunlight with an incident angle of 90 degrees tends to be absorbed, while lower an ...

A method of preventing oxidation of the exposed metal in structures by imposing between the structure and the ground a small electrical voltage.

A type of vertical-axis wind machine that has long, thin blades in the shape of loops connected to the top and bottom of the axle; often called an "eggbeater windmill."

The negative pole or electrode of an electrolytic cell, vacuum tube, etc., where electrons enter (current leaves) the system; the opposite of an anode.

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

The amount of heat required to raise the temperature of one pound of water one degree Fahrenheit; equal to 252 calories.