The natural, convective movement of air or water due to differences in temperature. In solar passive design a thermosyphon collector can be constructed and attached to a house to deliver heat to the home by the continuous pattern of the convective loop (o ...

A federal agency established in 1933 to develop the Tennessee river valley region of the southeastern U.S., and which is now nation's largest power producer.

The maximum load that a device is capable of carrying.

A thermal storage wall is a south-facing wall that is glazed on the outside. Solar heat strikes the glazing and is absorbed into the wall, which conducts the heat into the room over time. The walls are at least 8 in thick. Generally, the thicker the wall, ...

A diagram that indicates the average percentage of time that the wind blows from different directions, on a monthly or annual basis.

Any gaseous, liquid, or solid fuel used for indoor space heating.

see Peak Power

A device for converting mechanical energy to electrical energy.

An air heater in which air is blown over electric resistance heating coils.

The amount of visible light that passes through the glazing material of a window, expressed as a percentage.

A thin sheet of material (metal) of a heat exchanger that conducts heat to a fluid.

Solid fuels made from primarily wood sawdust that is compacted under high pressure to form small (about the size of rabbit feed) pellets for use in a pellet stove.

A measure of air purity that is equal to one complete air change (in an interior space).

An incorporated right, liberty, privilege, or use of another entity's property, distinct from ownership, without profit or compensation; a right-of-way.

A unit of electrical capacitance; the capacitance of a capacitor between the plates of which there appears a difference of 1 Volt when it is charged by one coulomb of electricity.

Air brought into a building from outside to replace exhaust air.

A curve that indicates the number of hours per year that specific wind speeds occur.

A heat storage system that uses a heat storage medium, and where the additional or removal of heat results in a change in temperature.

The effect of cooling by the radiation of heat from a building to the night sky.

Fuel gas with a heating value of between 200 and 300 Btu per cubic foot.